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| 193 | ········"/**\n·*·@module·LRUCache\n·*/\n\nimport·{·metrics,·tracing·}·from·'./diagnostics-channel.js'\n\nconst·hasSubscribers·=·()·=>\n··metrics.hasSubscribers·||·tracing.hasSubscribers\n\n//·module-private·names·and·types\n//·this·provides·the·default·Perf·object·source.\n//·it·can·be·passed·in·via·configuration·to·override·it\n//·for·a·single·LRU·object.\nexport·type·Perf·=·{·now:·()·=>·number·}\nconst·defaultPerf:·Perf·=\n··(\n····typeof·performance·===·'object'·&&\n····performance·&&\n····typeof·performance.now·===·'function'\n··)·?\n····performance\n··:·Date\n\nconst·warned·=·new·Set<string>()\n\n//·either·a·function·or·a·class\n//·oxlint-disable-next-line·no-explicit-any\ntype·ForC·=·((...a:·any[])·=>·any)·|·{·new·(...a:·any[]):·any·}\n\n/*·c8·ignore·start·*/\nconst·PROCESS·=·(\n··typeof·process·===·'object'·&&·!!process·?\n····process\n··:·{})·as·{·[k:·string]:·unknown·}\n/*·c8·ignore·stop·*/\n\nconst·emitWarning·=·(\n··msg:·string,\n··type:·string,\n··code:·string,\n··fn:·ForC,\n)·=>·{\n··if·(typeof·PROCESS.emitWarning·===·'function')·{\n····PROCESS.emitWarning(msg,·type,·code,·fn)\n··}·else·{\n····//oxlint-disable-next-line·no-console\n····console.error(`[${code}]·${type}:·${msg}`)\n··}\n}\nconst·shouldWarn·=·(code:·string)·=>·!warned.has(code)\n\nconst·TYPE·=·Symbol('type')\nexport·type·PosInt·=·number·&·{·[TYPE]:·'Positive·Integer'·}\nexport·type·Index·=·number·&·{·[TYPE]:·'LRUCache·Index'·}\n\nconst·isPosInt·=·(n:·unknown):·n·is·PosInt·=>\n··!!n·&&·n·===·Math.floor(n·as·number)·&&·n·>·0·&&·isFinite(n)\n\nexport·type·UintArray·=·Uint8Array·|·Uint16Array·|·Uint32Array\nexport·type·NumberArray·=·UintArray·|·number[]\n\n//·This·is·a·little·bit·ridiculous,·tbh.\n//·The·maximum·array·length·is·2^32-1·or·thereabouts·on·most·JS·impls.\n//·And·well·before·that·point,·you're·caching·the·entire·world,·I·mean,\n//·that's·~32GB·of·just·integers·for·the·next/prev·links,·plus·whatever\n//·else·to·hold·that·many·keys·and·values.··Just·filling·the·memory·with\n//·zeroes·at·init·time·is·brutal·when·you·get·that·big.\n//·But·why·not·be·complete?\n//·Maybe·in·the·future,·these·limits·will·have·expanded.\n/*·c8·ignore·start·*/\nconst·getUintArray·=·(max:·number)·=>\n··!isPosInt(max)·?·null\n··:·max·<=·Math.pow(2,·8)·?·Uint8Array\n··:·max·<=·Math.pow(2,·16)·?·Uint16Array\n··:·max·<=·Math.pow(2,·32)·?·Uint32Array\n··:·max·<=·Number.MAX_SAFE_INTEGER·?·ZeroArray\n··:·null\n/*·c8·ignore·stop·*/\n\nclass·ZeroArray·extends·Array<number>·{\n··constructor(size:·number)·{\n····super(size)\n····this.fill(0)\n··}\n}\nexport·type·{·ZeroArray·}\nexport·type·{·Stack·}\n\nexport·type·StackLike·=·Stack·|·Index[]\nclass·Stack·{\n··heap:·NumberArray\n··length:·number\n··//·private·constructor\n··static·#constructing:·boolean·=·false\n··static·create(max:·number):·StackLike·{\n····const·HeapCls·=·getUintArray(max)\n····if·(!HeapCls)·return·[]\n····Stack.#constructing·=·true\n····const·s·=·new·Stack(max,·HeapCls)\n····Stack.#constructing·=·false\n····return·s\n··}\n··constructor(max:·number,·HeapCls:·{·new·(n:·number):·NumberArray·})·{\n····/*·c8·ignore·start·*/\n····if·(!Stack.#constructing)·{\n······throw·new·TypeError('instantiate·Stack·using·Stack.create(n)')\n····}\n····/*·c8·ignore·stop·*/\n····this.heap·=·new·HeapCls(max)\n····this.length·=·0\n··}\n··push(n:·Index)·{\n····this.heap[this.length++]·=·n\n··}\n··pop():·Index·{\n····return·this.heap[--this.length]·as·Index\n··}\n}\n\n/**\n·*·Promise·representing·an·in-progress·{@link·LRUCache#fetch}·call\n·*/\nexport·type·BackgroundFetch<V>·=·Promise<V·|·undefined>·&·{\n··__returned:·BackgroundFetch<V>·|·undefined\n··__abortController:·AbortController\n··__staleWhileFetching:·V·|·undefined\n}\n\nexport·type·DisposeTask<K,·V>·=·[\n··value:·V,\n··key:·K,\n··reason:·LRUCache.DisposeReason,\n]\n\nexport·namespace·LRUCache·{\n··/**\n···*·An·integer·greater·than·0,·reflecting·the·calculated·size·of·items\n···*/\n··export·type·Size·=·number\n\n··/**\n···*·Integer·greater·than·0,·representing·some·number·of·milliseconds,·or·the\n···*·time·at·which·a·TTL·started·counting·from.\n···*/\n··export·type·Milliseconds·=·number\n\n··/**\n···*·An·integer·greater·than·0,·reflecting·a·number·of·items\n···*/\n··export·type·Count·=·number\n\n··/**\n···*·The·reason·why·an·item·was·removed·from·the·cache,·passed\n···*·to·the·{@link·Disposer}·methods.\n···*\n···*·-·`evict`:·The·item·was·evicted·because·it·is·the·least·recently·used,\n···*···and·the·cache·is·full.\n···*·-·`set`:·A·new·value·was·set,·overwriting·the·old·value·being·disposed.\n···*·-·`delete`:·The·item·was·explicitly·deleted,·either·by·calling\n···*···{@link·LRUCache#delete},·{@link·LRUCache#clear},·or\n···*···{@link·LRUCache#set}·with·an·undefined·value.\n···*·-·`expire`:·The·item·was·removed·due·to·exceeding·its·TTL.\n···*·-·`fetch`:·A·{@link·OptionsBase#fetchMethod}·operation·returned\n···*···`undefined`·or·was·aborted,·causing·the·item·to·be·deleted.\n···*/\n··export·type·DisposeReason·=\n····|·'evict'\n····|·'set'\n····|·'delete'\n····|·'expire'\n····|·'fetch'\n··/**\n···*·A·method·called·upon·item·removal,·passed·as·the\n···*·{@link·OptionsBase.dispose}·and/or\n···*·{@link·OptionsBase.disposeAfter}·options.\n···*/\n··export·type·Disposer<K,·V>·=·(\n····value:·V,\n····key:·K,\n····reason:·DisposeReason,\n··)·=>·void\n\n··/**\n···*·The·reason·why·an·item·was·added·to·the·cache,·passed\n···*·to·the·{@link·Inserter}·methods.\n···*\n···*·-·`add`:·the·item·was·not·found·in·the·cache,·and·was·added\n···*·-·`update`:·the·item·was·in·the·cache,·with·the·same·value·provided\n···*·-·`replace`:·the·item·was·in·the·cache,·and·replaced\n···*/\n··export·type·InsertReason·=·'add'·|·'update'·|·'replace'\n\n··/**\n···*·A·method·called·upon·item·insertion,·passed·as·the\n···*·{@link·OptionsBase.insert}\n···*/\n··export·type·Inserter<K,·V>·=·(\n····value:·V,\n····key:·K,\n····reason:·InsertReason,\n··)·=>·void\n\n··/**\n···*·A·function·that·returns·the·effective·calculated·size\n···*·of·an·entry·in·the·cache.\n···*/\n··export·type·SizeCalculator<K,·V>·=·(value:·V,·key:·K)·=>·Size\n\n··/**\n···*·Options·provided·to·the\n···*·{@link·OptionsBase.fetchMethod}·function.\n···*/\n··export·interface·FetcherOptions<K,·V,·FC·=·unknown>·{\n····signal:·AbortSignal\n····options:·FetcherFetchOptions<K,·V,·FC>\n····/**\n·····*·Object·provided·in·the·{@link·FetchOptions.context}·option·to\n·····*·{@link·LRUCache#fetch}\n·····*/\n····context:·FC\n··}\n\n··/**\n···*·Occasionally,·it·may·be·useful·to·track·the·internal·behavior·of·the\n···*·cache,·particularly·for·logging,·debugging,·or·for·behavior·within·the\n···*·`fetchMethod`.·To·do·this,·you·can·pass·a·`status`·object·to·the\n···*·{@link·LRUCache#fetch},·{@link·LRUCache#get},·{@link·LRUCache#set},\n···*·{@link·LRUCache#memo},·and·{@link·LRUCache#has}·methods.\n···*\n···*·The·`status`·option·should·be·a·plain·JavaScript·object.·The·following\n···*·fields·will·be·set·on·it·appropriately,·depending·on·the·situation.\n···*\n···*·These·objects·are·also·the·context·objects·passed·to·listeners·on·the\n···*·`lru-cache:metrics`·diagnostic·channel,·and·the·`lru-cache`·tracing\n···*·channels,·in·platforms·that·support·them.\n···*/\n··export·interface·Status<K,·V>·{\n····/**\n·····*·The·operation·being·performed\n·····*/\n····op?:·'get'·|·'set'·|·'memo'·|·'fetch'·|·'delete'·|·'has'·|·'peek'\n····/**\n·····*·The·status·of·a·set()·operation.\n·····*\n·····*·-·add:·the·item·was·not·found·in·the·cache,·and·was·added\n·····*·-·update:·the·item·was·in·the·cache,·with·the·same·value·provided\n·····*·-·replace:·the·item·was·in·the·cache,·and·replaced\n·····*·-·miss:·the·item·was·not·added·to·the·cache·for·some·reason\n·····*/\n····set?:·'add'·|·'update'·|·'replace'·|·'miss'·|·'deleted'\n\n····/**\n·····*·The·status·of·a·delete()·operation.\n·····*/\n····delete?:·LRUCache.DisposeReason\n\n····/**\n·····*·The·result·of·a·peek()·operation\n·····*\n·····*·-·hit:·the·item·was·found·and·returned\n·····*·-·stale:·the·item·is·in·the·cache,·but·past·its·ttl·and·not·returned\n·····*·-·miss:·item·not·in·the·cache\n·····*/\n····peek?:·'hit'·|·'miss'·|·'stale'\n\n····/**\n·····*·The·status·of·a·memo()·operation.\n·····*\n·····*·-·'hit':·the·item·was·found·in·the·cache·and·returned\n·····*·-·'miss':·the·`memoMethod`·function·was·called\n·····*/\n····memo?:·'hit'·|·'miss'\n\n····/**\n·····*·The·`context`·option·provided·to·a·memo·or·fetch·operation\n·····*\n·····*·In·practice,·of·course,·this·will·be·the·same·type·as·the·`FC`\n·····*·fetch·context·param·used·to·instantiate·the·LRUCache,·but·the\n·····*·convolutions·of·threading·that·through·would·get·quite·complicated,\n·····*·and·preclude·forcing/forbidding·the·passing·of·a·`context`·param\n·····*·where·it·is/isn't·expected,·which·is·more·valuable·for·error\n·····*·prevention.\n·····*/\n····context?:·unknown\n\n····/**\n·····*·the·ttl·stored·for·the·item,·or·undefined·if·ttls·are·not·used.\n·····*/\n····ttl?:·Milliseconds\n\n····/**\n·····*·the·start·time·for·the·item,·or·undefined·if·ttls·are·not·used.\n·····*/\n····start?:·Milliseconds\n\n····/**\n·····*·The·timestamp·used·for·TTL·calculation\n·····*/\n····now?:·Milliseconds\n\n····/**\n·····*·the·remaining·ttl·for·the·item,·or·undefined·if·ttls·are·not·used.\n·····*/\n····remainingTTL?:·Milliseconds\n\n····/**\n·····*·The·calculated·size·for·the·item,·if·sizes·are·used.\n·····*/\n····entrySize?:·Size\n\n····/**\n·····*·The·total·calculated·size·of·the·cache,·if·sizes·are·used.\n·····*/\n····totalCalculatedSize?:·Size\n\n····/**\n·····*·A·flag·indicating·that·the·item·was·not·stored,·due·to·exceeding·the\n·····*·{@link·OptionsBase.maxEntrySize}\n·····*/\n····maxEntrySizeExceeded?:·true\n\n····/**\n·····*·The·key·that·was·set·or·retrieved\n·····*/\n····key?:·K\n\n····/**\n·····*·The·value·that·was·set\n·····*/\n····value?:·V\n\n····/**\n·····*·The·old·value,·specified·in·the·case·of·`set:'replace'`\n·····*/\n····oldValue?:·V\n\n····/**\n·····*·The·results·of·a·{@link·LRUCache#has}·operation\n·····*\n·····*·-·hit:·the·item·was·found·in·the·cache\n·····*·-·stale:·the·item·was·found·in·the·cache,·but·is·stale\n·····*·-·miss:·the·item·was·not·found·in·the·cache\n·····*/\n····has?:·'hit'·|·'stale'·|·'miss'\n\n····/**\n·····*·The·status·of·a·{@link·LRUCache#fetch}·operation.\n·····*·Note·that·this·can·change·as·the·underlying·fetch()·moves·through\n·····*·various·states.\n·····*\n·····*·-·inflight:·there·is·another·fetch()·for·this·key·which·is·in·process\n·····*·-·get:·there·is·no·{@link·OptionsBase.fetchMethod},·so\n·····*···{@link·LRUCache#get}·was·called.\n·····*·-·miss:·the·item·is·not·in·cache,·and·will·be·fetched.\n·····*·-·hit:·the·item·is·in·the·cache,·and·was·resolved·immediately.\n·····*·-·stale:·the·item·is·in·the·cache,·but·stale.\n·····*·-·refresh:·the·item·is·in·the·cache,·and·not·stale,·but\n·····*···{@link·FetchOptions.forceRefresh}·was·specified.\n·····*/\n····fetch?:·'get'·|·'inflight'·|·'miss'·|·'hit'·|·'stale'·|·'refresh'\n\n····/**\n·····*·`forceRefresh`·option·was·used·for·either·a·fetch·or·memo·operation\n·····*/\n····forceRefresh?:·boolean\n\n····/**\n·····*·The·{@link·OptionsBase.fetchMethod}·was·called\n·····*/\n····fetchDispatched?:·true\n\n····/**\n·····*·The·cached·value·was·updated·after·a·successful·call·to\n·····*·{@link·OptionsBase.fetchMethod}\n·····*/\n····fetchUpdated?:·true\n\n····/**\n·····*·The·reason·for·a·fetch()·rejection.··Either·the·error·raised·by·the\n·····*·{@link·OptionsBase.fetchMethod},·or·the·reason·for·an\n·····*·AbortSignal.\n·····*/\n····fetchError?:·Error\n\n····/**\n·····*·The·fetch·received·an·abort·signal\n·····*/\n····fetchAborted?:·true\n\n····/**\n·····*·The·abort·signal·received·was·ignored,·and·the·fetch·was·allowed·to\n·····*·continue·in·the·background.\n·····*/\n····fetchAbortIgnored?:·true\n\n····/**\n·····*·The·fetchMethod·promise·resolved·successfully\n·····*/\n····fetchResolved?:·true\n\n····/**\n·····*·The·fetchMethod·promise·was·rejected\n·····*/\n····fetchRejected?:·true\n\n····/**\n·····*·The·status·of·a·{@link·LRUCache#get}·operation.\n·····*\n·····*·-·fetching:·The·item·is·currently·being·fetched.··If·a·previous·value\n·····*···is·present·and·allowed,·that·will·be·returned.\n·····*·-·stale:·The·item·is·in·the·cache,·and·is·stale.·If·it·was·returned,\n·····*···then·the·`returnedStale`·flag·will·be·set.\n·····*·-·stale-fetching:·The·value·is·being·fetched·in·the·background,·but·is\n·····*···currently·stale.·If·the·stale·value·was·returned,·then·the\n·····*···`returnedStale`·flag·will·be·set.\n·····*·-·hit:·the·item·is·in·the·cache\n·····*·-·miss:·the·item·is·not·in·the·cache\n·····*/\n····get?:·'stale'·|·'hit'·|·'miss'·|·'fetching'·|·'stale-fetching'\n\n····/**\n·····*·A·fetch·or·get·operation·returned·a·stale·value.\n·····*/\n····returnedStale?:·true\n\n····/**\n·····*·A·tracingChannel·trace·was·started·for·this·operation\n·····*/\n····trace?:·boolean\n··}\n\n··/**\n···*·options·which·override·the·options·set·in·the·LRUCache·constructor\n···*·when·calling·{@link·LRUCache#fetch}.\n···*\n···*·This·is·the·union·of·{@link·GetOptions}·and·{@link·SetOptions},·plus\n···*·{@link·OptionsBase.noDeleteOnFetchRejection},\n···*·{@link·OptionsBase.allowStaleOnFetchRejection},\n···*·{@link·FetchOptions.forceRefresh},·and\n···*·{@link·FetcherOptions.context}\n···*\n···*·Any·of·these·may·be·modified·in·the·{@link·OptionsBase.fetchMethod}\n···*·function,·but·the·{@link·GetOptions}·fields·will·of·course·have·no\n···*·effect,·as·the·{@link·LRUCache#get}·call·already·happened·by·the·time\n···*·the·fetchMethod·is·called.\n···*/\n··export·interface·FetcherFetchOptions<K,·V,·FC·=·unknown>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····|·'allowStale'\n····|·'updateAgeOnGet'\n····|·'noDeleteOnStaleGet'\n····|·'sizeCalculation'\n····|·'ttl'\n····|·'noDisposeOnSet'\n····|·'noUpdateTTL'\n····|·'noDeleteOnFetchRejection'\n····|·'allowStaleOnFetchRejection'\n····|·'ignoreFetchAbort'\n····|·'allowStaleOnFetchAbort'\n··>·{\n····status?:·Status<K,·V>\n····size?:·Size\n··}\n\n··/**\n···*·Options·that·may·be·passed·to·the·{@link·LRUCache#fetch}·method.\n···*/\n··export·interface·FetchOptions<K,·V,·FC>·extends·FetcherFetchOptions<\n····K,\n····V,\n····FC\n··>·{\n····/**\n·····*·Set·to·true·to·force·a·re-load·of·the·existing·data,·even·if·it\n·····*·is·not·yet·stale.\n·····*/\n····forceRefresh?:·boolean\n····/**\n·····*·Context·provided·to·the·{@link·OptionsBase.fetchMethod}·as\n·····*·the·{@link·FetcherOptions.context}·param.\n·····*\n·····*·If·the·FC·type·is·specified·as·unknown·(the·default),\n·····*·undefined·or·void,·then·this·is·optional.··Otherwise,·it·will\n·····*·be·required.\n·····*/\n····context?:·FC\n····signal?:·AbortSignal\n····status?:·Status<K,·V>\n··}\n··/**\n···*·Options·provided·to·{@link·LRUCache#fetch}·when·the·FC·type·is·something\n···*·other·than·`unknown`,·`undefined`,·or·`void`\n···*/\n··export·interface·FetchOptionsWithContext<K,·V,·FC>·extends·FetchOptions<\n····K,\n····V,\n····FC\n··>·{\n····context:·FC\n··}\n··/**\n···*·Options·provided·to·{@link·LRUCache#fetch}·when·the·FC·type·is\n···*·`undefined`·or·`void`\n···*/\n··export·interface·FetchOptionsNoContext<K,·V>·extends·FetchOptions<\n····K,\n····V,\n····undefined\n··>·{\n····context?:·undefined\n··}\n\n··export·interface·MemoOptions<K,·V,·FC·=·unknown>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····|·'allowStale'\n····|·'updateAgeOnGet'\n····|·'noDeleteOnStaleGet'\n····|·'sizeCalculation'\n····|·'ttl'\n····|·'noDisposeOnSet'\n····|·'noUpdateTTL'\n····|·'noDeleteOnFetchRejection'\n····|·'allowStaleOnFetchRejection'\n····|·'ignoreFetchAbort'\n····|·'allowStaleOnFetchAbort'\n··>·{\n····/**\n·····*·Set·to·true·to·force·a·re-load·of·the·existing·data,·even·if·it\n·····*·is·not·yet·stale.\n·····*/\n····forceRefresh?:·boolean\n····/**\n·····*·Context·provided·to·the·{@link·OptionsBase.memoMethod}·as\n·····*·the·{@link·MemoizerOptions.context}·param.\n·····*\n·····*·If·the·FC·type·is·specified·as·unknown·(the·default),\n·····*·undefined·or·void,·then·this·is·optional.··Otherwise,·it·will\n·····*·be·required.\n·····*/\n····context?:·FC\n····status?:·Status<K,·V>\n··}\n··/**\n···*·Options·provided·to·{@link·LRUCache#memo}·when·the·FC·type·is·something\n···*·other·than·`unknown`,·`undefined`,·or·`void`\n···*/\n··export·interface·MemoOptionsWithContext<K,·V,·FC>·extends·MemoOptions<\n····K,\n····V,\n····FC\n··>·{\n····context:·FC\n··}\n··/**\n···*·Options·provided·to·{@link·LRUCache#memo}·when·the·FC·type·is\n···*·`undefined`·or·`void`\n···*/\n··export·interface·MemoOptionsNoContext<K,·V>·extends·MemoOptions<\n····K,\n····V,\n····undefined\n··>·{\n····context?:·undefined\n··}\n\n··/**\n···*·Options·provided·to·the\n···*·{@link·OptionsBase.memoMethod}·function.\n···*/\n··export·interface·MemoizerOptions<K,·V,·FC·=·unknown>·{\n····options:·MemoizerMemoOptions<K,·V,·FC>\n····/**\n·····*·Object·provided·in·the·{@link·MemoOptions.context}·option·to\n·····*·{@link·LRUCache#memo}\n·····*/\n····context:·FC\n··}\n\n··/**\n···*·options·which·override·the·options·set·in·the·LRUCache·constructor\n···*·when·calling·{@link·LRUCache#memo}.\n···*\n···*·This·is·the·union·of·{@link·GetOptions}·and·{@link·SetOptions},·plus\n···*·{@link·MemoOptions.forceRefresh},·and\n···*·{@link·MemoOptions.context}\n···*\n···*·Any·of·these·may·be·modified·in·the·{@link·OptionsBase.memoMethod}\n···*·function,·but·the·{@link·GetOptions}·fields·will·of·course·have·no\n···*·effect,·as·the·{@link·LRUCache#get}·call·already·happened·by·the·time\n···*·the·memoMethod·is·called.\n···*/\n··export·interface·MemoizerMemoOptions<K,·V,·FC·=·unknown>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····|·'allowStale'\n····|·'updateAgeOnGet'\n····|·'noDeleteOnStaleGet'\n····|·'sizeCalculation'\n····|·'ttl'\n····|·'noDisposeOnSet'\n····|·'noUpdateTTL'\n··>·{\n····status?:·Status<K,·V>\n····size?:·Size\n····start?:·Milliseconds\n··}\n\n··/**\n···*·Options·that·may·be·passed·to·the·{@link·LRUCache#has}·method.\n···*/\n··export·interface·HasOptions<K,·V,·FC>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····'updateAgeOnHas'\n··>·{\n····status?:·Status<K,·V>\n··}\n\n··/**\n···*·Options·that·may·be·passed·to·the·{@link·LRUCache#get}·method.\n···*/\n··export·interface·GetOptions<K,·V,·FC>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····'allowStale'·|·'updateAgeOnGet'·|·'noDeleteOnStaleGet'\n··>·{\n····status?:·Status<K,·V>\n··}\n\n··/**\n···*·Options·that·may·be·passed·to·the·{@link·LRUCache#peek}·method.\n···*/\n··export·interface·PeekOptions<K,·V,·FC>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····'allowStale'\n··>·{\n····status?:·Status<K,·V>\n··}\n\n··/**\n···*·Options·that·may·be·passed·to·the·{@link·LRUCache#set}·method.\n···*/\n··export·interface·SetOptions<K,·V,·FC>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····'sizeCalculation'·|·'ttl'·|·'noDisposeOnSet'·|·'noUpdateTTL'\n··>·{\n····/**\n·····*·If·size·tracking·is·enabled,·then·setting·an·explicit·size\n·····*·in·the·{@link·LRUCache#set}·call·will·prevent·calling·the\n·····*·{@link·OptionsBase.sizeCalculation}·function.\n·····*/\n····size?:·Size\n····/**\n·····*·If·TTL·tracking·is·enabled,·then·setting·an·explicit·start\n·····*·time·in·the·{@link·LRUCache#set}·call·will·override·the\n·····*·default·time·from·`performance.now()`·or·`Date.now()`.\n·····*\n·····*·Note·that·it·must·be·a·valid·value·for·whichever·time-tracking\n·····*·method·is·in·use.\n·····*/\n····start?:·Milliseconds\n····status?:·Status<K,·V>\n··}\n\n··/**\n···*·The·type·signature·for·the·{@link·OptionsBase.fetchMethod}·option.\n···*/\n··export·type·Fetcher<K,·V,·FC·=·unknown>·=·(\n····key:·K,\n····staleValue:·V·|·undefined,\n····options:·FetcherOptions<K,·V,·FC>,\n··)·=>·Promise<V·|·undefined·|·void>·|·V·|·undefined·|·void\n\n··/**\n···*·the·type·signature·for·the·{@link·OptionsBase.memoMethod}·option.\n···*/\n··export·type·Memoizer<K,·V,·FC·=·unknown>·=·(\n····key:·K,\n····staleValue:·V·|·undefined,\n····options:·MemoizerOptions<K,·V,·FC>,\n··)·=>·V\n\n··/**\n···*·Options·which·may·be·passed·to·the·{@link·LRUCache}·constructor.\n···*\n···*·Most·of·these·may·be·overridden·in·the·various·options·that·use\n···*·them.\n···*\n···*·Despite·all·being·technically·optional,·the·constructor·requires·that\n···*·a·cache·is·at·minimum·limited·by·one·or·more·of·{@link·OptionsBase.max},\n···*·{@link·OptionsBase.ttl},·or·{@link·OptionsBase.maxSize}.\n···*\n···*·If·{@link·OptionsBase.ttl}·is·used·alone,·then·it·is·strongly·advised\n···*·(and·in·fact·required·by·the·type·definitions·here)·that·the·cache\n···*·also·set·{@link·OptionsBase.ttlAutopurge},·to·prevent·potentially\n···*·unbounded·storage.\n···*\n···*·All·options·are·also·available·on·the·{@link·LRUCache}·instance,·making\n···*·it·safe·to·pass·an·LRUCache·instance·as·the·options·argumemnt·to\n···*·make·another·empty·cache·of·the·same·type.\n···*\n···*·Some·options·are·marked·as·read-only,·because·changing·them·after\n···*·instantiation·is·not·safe.·Changing·any·of·the·other·options·will·of\n···*·course·only·have·an·effect·on·subsequent·method·calls.\n···*/\n··export·interface·OptionsBase<K,·V,·FC>·{\n····/**\n·····*·The·maximum·number·of·items·to·store·in·the·cache·before·evicting\n·····*·old·entries.·This·is·read-only·on·the·{@link·LRUCache}·instance,\n·····*·and·may·not·be·overridden.\n·····*\n·····*·If·set,·then·storage·space·will·be·pre-allocated·at·construction\n·····*·time,·and·the·cache·will·perform·significantly·faster.\n·····*\n·····*·Note·that·significantly·fewer·items·may·be·stored,·if\n·····*·{@link·OptionsBase.maxSize}·and/or·{@link·OptionsBase.ttl}·are·also\n·····*·set.\n·····*\n·····*·**It·is·strongly·recommended·to·set·a·`max`·to·prevent·unbounded·growth\n·····*·of·the·cache.**\n·····*/\n····max?:·Count\n\n····/**\n·····*·Max·time·in·milliseconds·for·items·to·live·in·cache·before·they·are\n·····*·considered·stale.··Note·that·stale·items·are·NOT·preemptively·removed·by\n·····*·default,·and·MAY·live·in·the·cache,·contributing·to·its·LRU·max,·long\n·····*·after·they·have·expired,·unless·{@link·OptionsBase.ttlAutopurge}·is\n·····*·set.\n·····*\n·····*·If·set·to·`0`·(the·default·value),·then·that·means·\"do·not·track\n·····*·TTL\",·not·\"expire·immediately\".\n·····*\n·····*·Also,·as·this·cache·is·optimized·for·LRU/MRU·operations,·some·of\n·····*·the·staleness/TTL·checks·will·reduce·performance,·as·they·will·incur\n·····*·overhead·by·deleting·items.\n·····*\n·····*·This·is·not·primarily·a·TTL·cache,·and·does·not·make·strong·TTL\n·····*·guarantees.·There·is·no·pre-emptive·pruning·of·expired·items,·but·you\n·····*·_may_·set·a·TTL·on·the·cache,·and·it·will·treat·expired·items·as·missing\n·····*·when·they·are·fetched,·and·delete·them.\n·····*\n·····*·Optional,·but·must·be·a·non-negative·integer·in·ms·if·specified.\n·····*\n·····*·This·may·be·overridden·by·passing·an·options·object·to·`cache.set()`.\n·····*\n·····*·At·least·one·of·`max`,·`maxSize`,·or·`TTL`·is·required.·This·must·be·a\n·····*·positive·integer·if·set.\n·····*\n·····*·Even·if·ttl·tracking·is·enabled,·**it·is·strongly·recommended·to·set·a\n·····*·`max`·to·prevent·unbounded·growth·of·the·cache.**\n·····*\n·····*·If·ttl·tracking·is·enabled,·and·`max`·and·`maxSize`·are·not·set,\n·····*·and·`ttlAutopurge`·is·not·set,·then·a·warning·will·be·emitted\n·····*·cautioning·about·the·potential·for·unbounded·memory·consumption.\n·····*·(The·TypeScript·definitions·will·also·discourage·this.)\n·····*/\n····ttl?:·Milliseconds\n\n····/**\n·····*·Minimum·amount·of·time·in·ms·in·which·to·check·for·staleness.\n·····*·Defaults·to·1,·which·means·that·the·current·time·is·checked\n·····*·at·most·once·per·millisecond.\n·····*\n·····*·Set·to·0·to·check·the·current·time·every·time·staleness·is·tested.\n·····*·(This·reduces·performance,·and·is·theoretically·unnecessary.)\n·····*\n·····*·Setting·this·to·a·higher·value·will·improve·performance·somewhat\n·····*·while·using·ttl·tracking,·albeit·at·the·expense·of·keeping·stale\n·····*·items·around·a·bit·longer·than·their·TTLs·would·indicate.\n·····*\n·····*·@default·1\n·····*/\n····ttlResolution?:·Milliseconds\n\n····/**\n·····*·Preemptively·remove·stale·items·from·the·cache.\n·····*\n·····*·Note·that·this·may·*significantly*·degrade·performance,·especially·if\n·····*·the·cache·is·storing·a·large·number·of·items.·It·is·almost·always·best\n·····*·to·just·leave·the·stale·items·in·the·cache,·and·let·them·fall·out·as·new\n·····*·items·are·added.\n·····*\n·····*·Note·that·this·means·that·{@link·OptionsBase.allowStale}·is·a·bit\n·····*·pointless,·as·stale·items·will·be·deleted·almost·as·soon·as·they\n·····*·expire.\n·····*\n·····*·Use·with·caution!\n·····*/\n····ttlAutopurge?:·boolean\n\n····/**\n·····*·When·using·time-expiring·entries·with·`ttl`,·setting·this·to·`true`·will\n·····*·make·each·item's·age·reset·to·0·whenever·it·is·retrieved·from·cache·with\n·····*·{@link·LRUCache#get},·causing·it·to·not·expire.·(It·can·still·fall·out\n·····*·of·cache·based·on·recency·of·use,·of·course.)\n·····*\n·····*·Has·no·effect·if·{@link·OptionsBase.ttl}·is·not·set.\n·····*\n·····*·This·may·be·overridden·by·passing·an·options·object·to·`cache.get()`.\n·····*/\n····updateAgeOnGet?:·boolean\n\n····/**\n·····*·When·using·time-expiring·entries·with·`ttl`,·setting·this·to·`true`·will\n·····*·make·each·item's·age·reset·to·0·whenever·its·presence·in·the·cache·is\n·····*·checked·with·{@link·LRUCache#has},·causing·it·to·not·expire.·(It·can\n·····*·still·fall·out·of·cache·based·on·recency·of·use,·of·course.)\n·····*\n·····*·Has·no·effect·if·{@link·OptionsBase.ttl}·is·not·set.\n·····*/\n····updateAgeOnHas?:·boolean\n\n····/**\n·····*·Allow·{@link·LRUCache#get}·and·{@link·LRUCache#fetch}·calls·to·return\n·····*·stale·data,·if·available.\n·····*\n·····*·By·default,·if·you·set·`ttl`,·stale·items·will·only·be·deleted·from·the\n·····*·cache·when·you·`get(key)`.·That·is,·it's·not·preemptively·pruning·items,\n·····*·unless·{@link·OptionsBase.ttlAutopurge}·is·set.\n·····*\n·····*·If·you·set·`allowStale:true`,·it'll·return·the·stale·value·*as·well·as*\n·····*·deleting·it.·If·you·don't·set·this,·then·it'll·return·`undefined`·when\n·····*·you·try·to·get·a·stale·entry.\n·····*\n·····*·Note·that·when·a·stale·entry·is·fetched,·_even·if·it·is·returned·due·to\n·····*·`allowStale`·being·set_,·it·is·removed·from·the·cache·immediately.·You\n·····*·can·suppress·this·behavior·by·setting\n·····*·{@link·OptionsBase.noDeleteOnStaleGet},·either·in·the·constructor,·or·in\n·····*·the·options·provided·to·{@link·LRUCache#get}.\n·····*\n·····*·This·may·be·overridden·by·passing·an·options·object·to·`cache.get()`.\n·····*·The·`cache.has()`·method·will·always·return·`false`·for·stale·items.\n·····*\n·····*·Only·relevant·if·a·ttl·is·set.\n·····*/\n····allowStale?:·boolean\n\n····/**\n·····*·Function·that·is·called·on·items·when·they·are·dropped·from·the\n·····*·cache,·as·`dispose(value,·key,·reason)`.\n·····*\n·····*·This·can·be·handy·if·you·want·to·close·file·descriptors·or·do\n·····*·other·cleanup·tasks·when·items·are·no·longer·stored·in·the·cache.\n·····*\n·····*·**NOTE**:·It·is·called·_before_·the·item·has·been·fully·removed\n·····*·from·the·cache,·so·if·you·want·to·put·it·right·back·in,·you·need\n·····*·to·wait·until·the·next·tick.·If·you·try·to·add·it·back·in·during\n·····*·the·`dispose()`·function·call,·it·will·break·things·in·subtle·and\n·····*·weird·ways.\n·····*\n·····*·Unlike·several·other·options,·this·may·_not_·be·overridden·by\n·····*·passing·an·option·to·`set()`,·for·performance·reasons.\n·····*\n·····*·The·`reason`·will·be·one·of·the·following·strings,·corresponding\n·····*·to·the·reason·for·the·item's·deletion:\n·····*\n·····*·-·`evict`·Item·was·evicted·to·make·space·for·a·new·addition\n·····*·-·`set`·Item·was·overwritten·by·a·new·value\n·····*·-·`expire`·Item·expired·its·TTL\n·····*·-·`fetch`·Item·was·deleted·due·to·a·failed·or·aborted·fetch,·or·a\n·····*···fetchMethod·returning·`undefined.\n·····*·-·`delete`·Item·was·removed·by·explicit·`cache.delete(key)`,\n·····*···`cache.clear()`,·or·`cache.set(key,·undefined)`.\n·····*/\n····dispose?:·Disposer<K,·V>\n\n····/**\n·····*·Function·that·is·called·when·new·items·are·inserted·into·the·cache,\n·····*·as·`onInsert(value,·key,·reason)`.\n·····*\n·····*·This·can·be·useful·if·you·need·to·perform·actions·when·an·item·is\n·····*·added,·such·as·logging·or·tracking·insertions.\n·····*\n·····*·Unlike·some·other·options,·this·may·_not_·be·overridden·by·passing\n·····*·an·option·to·`set()`,·for·performance·and·consistency·reasons.\n·····*/\n····onInsert?:·Inserter<K,·V>\n\n····/**\n·····*·The·same·as·{@link·OptionsBase.dispose},·but·called·*after*·the·entry\n·····*·is·completely·removed·and·the·cache·is·once·again·in·a·clean·state.\n·····*\n·····*·It·is·safe·to·add·an·item·right·back·into·the·cache·at·this·point.\n·····*·However,·note·that·it·is·*very*·easy·to·inadvertently·create·infinite\n·····*·recursion·this·way.\n·····*/\n····disposeAfter?:·Disposer<K,·V>\n\n····/**\n·····*·Set·to·true·to·suppress·calling·the\n·····*·{@link·OptionsBase.dispose}·function·if·the·entry·key·is\n·····*·still·accessible·within·the·cache.\n·····*\n·····*·This·may·be·overridden·by·passing·an·options·object·to\n·····*·{@link·LRUCache#set}.\n·····*\n·····*·Only·relevant·if·`dispose`·or·`disposeAfter`·are·set.\n·····*/\n····noDisposeOnSet?:·boolean\n\n····/**\n·····*·Boolean·flag·to·tell·the·cache·to·not·update·the·TTL·when·setting·a·new\n·····*·value·for·an·existing·key·(ie,·when·updating·a·value·rather·than\n·····*·inserting·a·new·value).··Note·that·the·TTL·value·is·_always_·set·(if\n·····*·provided)·when·adding·a·new·entry·into·the·cache.\n·····*\n·····*·Has·no·effect·if·a·{@link·OptionsBase.ttl}·is·not·set.\n·····*\n·····*·May·be·passed·as·an·option·to·{@link·LRUCache#set}.\n·····*/\n····noUpdateTTL?:·boolean\n\n····/**\n·····*·Set·to·a·positive·integer·to·track·the·sizes·of·items·added·to·the\n·····*·cache,·and·automatically·evict·items·in·order·to·stay·below·this·size.\n·····*·Note·that·this·may·result·in·fewer·than·`max`·items·being·stored.\n·····*\n·····*·Attempting·to·add·an·item·to·the·cache·whose·calculated·size·is·greater\n·····*·that·this·amount·will·be·a·no-op.·The·item·will·not·be·cached,·and·no\n·····*·other·items·will·be·evicted.\n·····*\n·····*·Optional,·must·be·a·positive·integer·if·provided.\n·····*\n·····*·Sets·`maxEntrySize`·to·the·same·value,·unless·a·different·value·is\n·····*·provided·for·`maxEntrySize`.\n·····*\n·····*·At·least·one·of·`max`,·`maxSize`,·or·`TTL`·is·required.·This·must·be·a\n·····*·positive·integer·if·set.\n·····*\n·····*·Even·if·size·tracking·is·enabled,·**it·is·strongly·recommended·to·set·a\n·····*·`max`·to·prevent·unbounded·growth·of·the·cache.**\n·····*\n·····*·Note·also·that·size·tracking·can·negatively·impact·performance,\n·····*·though·for·most·cases,·only·minimally.\n·····*/\n····maxSize?:·Size\n\n····/**\n·····*·The·maximum·allowed·size·for·any·single·item·in·the·cache.\n·····*\n·····*·If·a·larger·item·is·passed·to·{@link·LRUCache#set}·or·returned·by·a\n·····*·{@link·OptionsBase.fetchMethod}·or·{@link·OptionsBase.memoMethod},·then\n·····*·it·will·not·be·stored·in·the·cache.\n·····*\n·····*·Attempting·to·add·an·item·whose·calculated·size·is·greater·than\n·····*·this·amount·will·not·cache·the·item·or·evict·any·old·items,·but\n·····*·WILL·delete·an·existing·value·if·one·is·already·present.\n·····*\n·····*·Optional,·must·be·a·positive·integer·if·provided.·Defaults·to\n·····*·the·value·of·`maxSize`·if·provided.\n·····*/\n····maxEntrySize?:·Size\n\n····/**\n·····*·A·function·that·returns·a·number·indicating·the·item's·size.\n·····*\n·····*·Requires·{@link·OptionsBase.maxSize}·to·be·set.\n·····*\n·····*·If·not·provided,·and·{@link·OptionsBase.maxSize}·or\n·····*·{@link·OptionsBase.maxEntrySize}·are·set,·then·all\n·····*·{@link·LRUCache#set}·calls·**must**·provide·an·explicit\n·····*·{@link·SetOptions.size}·or·sizeCalculation·param.\n·····*/\n····sizeCalculation?:·SizeCalculator<K,·V>\n\n····/**\n·····*·Method·that·provides·the·implementation·for·{@link·LRUCache#fetch}\n·····*\n·····*·```ts\n·····*·fetchMethod(key,·staleValue,·{·signal,·options,·context·})\n·····*·```\n·····*\n·····*·If·`fetchMethod`·is·not·provided,·then·`cache.fetch(key)`·is·equivalent\n·····*·to·`Promise.resolve(cache.get(key))`.\n·····*\n·····*·If·at·any·time,·`signal.aborted`·is·set·to·`true`,·or·if·the\n·····*·`signal.onabort`·method·is·called,·or·if·it·emits·an·`'abort'`·event\n·····*·which·you·can·listen·to·with·`addEventListener`,·then·that·means·that\n·····*·the·fetch·should·be·abandoned.·This·may·be·passed·along·to·async\n·····*·functions·aware·of·AbortController/AbortSignal·behavior.\n·····*\n·····*·The·`fetchMethod`·should·**only**·return·`undefined`·or·a·Promise\n·····*·resolving·to·`undefined`·if·the·AbortController·signaled·an·`abort`\n·····*·event.·In·all·other·cases,·it·should·return·or·resolve·to·a·value\n·····*·suitable·for·adding·to·the·cache.\n·····*\n·····*·The·`options`·object·is·a·union·of·the·options·that·may·be·provided·to\n·····*·`set()`·and·`get()`.·If·they·are·modified,·then·that·will·result·in\n·····*·modifying·the·settings·to·`cache.set()`·when·the·value·is·resolved,·and\n·····*·in·the·case·of\n·····*·{@link·OptionsBase.noDeleteOnFetchRejection}·and\n·····*·{@link·OptionsBase.allowStaleOnFetchRejection},·the·handling·of\n·····*·`fetchMethod`·failures.\n·····*\n·····*·For·example,·a·DNS·cache·may·update·the·TTL·based·on·the·value·returned\n·····*·from·a·remote·DNS·server·by·changing·`options.ttl`·in·the·`fetchMethod`.\n·····*/\n····fetchMethod?:·Fetcher<K,·V,·FC>\n\n····/**\n·····*·Method·that·provides·the·implementation·for·{@link·LRUCache#memo}\n·····*/\n····memoMethod?:·Memoizer<K,·V,·FC>\n\n····/**\n·····*·Set·to·true·to·suppress·the·deletion·of·stale·data·when·a\n·····*·{@link·OptionsBase.fetchMethod}·returns·a·rejected·promise.\n·····*/\n····noDeleteOnFetchRejection?:·boolean\n\n····/**\n·····*·Do·not·delete·stale·items·when·they·are·retrieved·with\n·····*·{@link·LRUCache#get}.\n·····*\n·····*·Note·that·the·`get`·return·value·will·still·be·`undefined`\n·····*·unless·{@link·OptionsBase.allowStale}·is·true.\n·····*\n·····*·When·using·time-expiring·entries·with·`ttl`,·by·default·stale\n·····*·items·will·be·removed·from·the·cache·when·the·key·is·accessed\n·····*·with·`cache.get()`.\n·····*\n·····*·Setting·this·option·will·cause·stale·items·to·remain·in·the·cache,·until\n·····*·they·are·explicitly·deleted·with·`cache.delete(key)`,·or·retrieved·with\n·····*·`noDeleteOnStaleGet`·set·to·`false`.\n·····*\n·····*·This·may·be·overridden·by·passing·an·options·object·to·`cache.get()`.\n·····*\n·····*·Only·relevant·if·a·ttl·is·used.\n·····*/\n····noDeleteOnStaleGet?:·boolean\n\n····/**\n·····*·Set·to·true·to·allow·returning·stale·data·when·a\n·····*·{@link·OptionsBase.fetchMethod}·throws·an·error·or·returns·a·rejected\n·····*·promise.\n·····*\n·····*·This·differs·from·using·{@link·OptionsBase.allowStale}·in·that·stale\n·····*·data·will·ONLY·be·returned·in·the·case·that·the·{@link·LRUCache#fetch}\n·····*·fails,·not·any·other·times.\n·····*\n·····*·If·a·`fetchMethod`·fails,·and·there·is·no·stale·value·available,·the\n·····*·`fetch()`·will·resolve·to·`undefined`.·Ie,·all·`fetchMethod`·errors·are\n·····*·suppressed.\n·····*\n·····*·Implies·`noDeleteOnFetchRejection`.\n·····*\n·····*·This·may·be·set·in·calls·to·`fetch()`,·or·defaulted·on·the·constructor,\n·····*·or·overridden·by·modifying·the·options·object·in·the·`fetchMethod`.\n·····*/\n····allowStaleOnFetchRejection?:·boolean\n\n····/**\n·····*·Set·to·true·to·return·a·stale·value·from·the·cache·when·the\n·····*·`AbortSignal`·passed·to·the·{@link·OptionsBase.fetchMethod}·dispatches\n·····*·an·`'abort'`·event,·whether·user-triggered,·or·due·to·internal·cache\n·····*·behavior.\n·····*\n·····*·Unless·{@link·OptionsBase.ignoreFetchAbort}·is·also·set,·the·underlying\n·····*·{@link·OptionsBase.fetchMethod}·will·still·be·considered·canceled,·and\n·····*·any·value·it·returns·will·be·ignored·and·not·cached.\n·····*\n·····*·Caveat:·since·fetches·are·aborted·when·a·new·value·is·explicitly\n·····*·set·in·the·cache,·this·can·lead·to·fetch·returning·a·stale·value,\n·····*·since·that·was·the·fallback·value·_at·the·moment·the·`fetch()`·was\n·····*·initiated_,·even·though·the·new·updated·value·is·now·present·in\n·····*·the·cache.\n·····*\n·····*·For·example:\n·····*\n·····*·```ts\n·····*·const·cache·=·new·LRUCache<string,·any>({\n·····*···ttl:·100,\n·····*···fetchMethod:·async·(url,·oldValue,·{·signal·})·=>··{\n·····*·····const·res·=·await·fetch(url,·{·signal·})\n·····*·····return·await·res.json()\n·····*···}\n·····*·})\n·····*·cache.set('https://example.com/',·{·some:·'data'·})\n·····*·//·100ms·go·by...\n·····*·const·result·=·cache.fetch('https://example.com/')\n·····*·cache.set('https://example.com/',·{·other:·'thing'·})\n·····*·console.log(await·result)·//·{·some:·'data'·}\n·····*·console.log(cache.get('https://example.com/'))·//·{·other:·'thing'·}\n·····*·```\n·····*/\n····allowStaleOnFetchAbort?:·boolean\n\n····/**\n·····*·Set·to·true·to·ignore·the·`abort`·event·emitted·by·the·`AbortSignal`\n·····*·object·passed·to·{@link·OptionsBase.fetchMethod},·and·still·cache·the\n·····*·resulting·resolution·value,·as·long·as·it·is·not·`undefined`.\n·····*\n·····*·When·used·on·its·own,·this·means·aborted·{@link·LRUCache#fetch}·calls\n·····*·are·not·immediately·resolved·or·rejected·when·they·are·aborted,·and\n·····*·instead·take·the·full·time·to·await.\n·····*\n·····*·When·used·with·{@link·OptionsBase.allowStaleOnFetchAbort},·aborted\n·····*·{@link·LRUCache#fetch}·calls·will·resolve·immediately·to·their·stale\n·····*·cached·value·or·`undefined`,·and·will·continue·to·process·and·eventually\n·····*·update·the·cache·when·they·resolve,·as·long·as·the·resulting·value·is\n·····*·not·`undefined`,·thus·supporting·a·\"return·stale·on·timeout·while\n·····*·refreshing\"·mechanism·by·passing·`AbortSignal.timeout(n)`·as·the·signal.\n·····*\n·····*·For·example:\n·····*\n·····*·```ts\n·····*·const·c·=·new·LRUCache({\n·····*···ttl:·100,\n·····*···ignoreFetchAbort:·true,\n·····*···allowStaleOnFetchAbort:·true,\n·····*···fetchMethod:·async·(key,·oldValue,·{·signal·})·=>·{\n·····*·····//·note:·do·NOT·pass·the·signal·to·fetch()!\n·····*·····//·let's·say·this·fetch·can·take·a·long·time.\n·····*·····const·res·=·await·fetch(`https://slow-backend-server/${key}`)\n·····*·····return·await·res.json()\n·····*···},\n·····*·})\n·····*\n·····*·//·this·will·return·the·stale·value·after·100ms,·while·still\n·····*·//·updating·in·the·background·for·next·time.\n·····*·const·val·=·await·c.fetch('key',·{·signal:·AbortSignal.timeout(100)·})\n·····*·```\n·····*\n·····*·**Note**:·regardless·of·this·setting,·an·`abort`·event·_is·still\n·····*·emitted·on·the·`AbortSignal`·object_,·so·may·result·in·invalid·results\n·····*·when·passed·to·other·underlying·APIs·that·use·AbortSignals.\n·····*\n·····*·This·may·be·overridden·in·the·{@link·OptionsBase.fetchMethod}·or·the\n·····*·call·to·{@link·LRUCache#fetch}.\n·····*/\n····ignoreFetchAbort?:·boolean\n\n····/**\n·····*·In·some·cases,·you·may·want·to·swap·out·the·performance/Date·object\n·····*·used·for·TTL·tracking.·This·should·almost·certainly·NOT·be·done·in\n·····*·production·environments!\n·····*\n·····*·This·value·defaults·to·`global.performance`·if·it·has·a·`now()`·method,\n·····*·or·the·`global.Date`·object·otherwise.\n·····*/\n····perf?:·Perf\n··}\n\n··export·interface·OptionsMaxLimit<K,·V,·FC>·extends·OptionsBase<\n····K,\n····V,\n····FC\n··>·{\n····max:·Count\n··}\n··export·interface·OptionsTTLLimit<K,·V,·FC>·extends·OptionsBase<\n····K,\n····V,\n····FC\n··>·{\n····ttl:·Milliseconds\n····ttlAutopurge:·boolean\n··}\n··export·interface·OptionsSizeLimit<K,·V,·FC>·extends·OptionsBase<\n····K,\n····V,\n····FC\n··>·{\n····maxSize:·Size\n··}\n\n··/**\n···*·The·valid·safe·options·for·the·{@link·LRUCache}·constructor\n···*/\n··export·type·Options<K,·V,·FC>·=\n····|·OptionsMaxLimit<K,·V,·FC>\n····|·OptionsSizeLimit<K,·V,·FC>\n····|·OptionsTTLLimit<K,·V,·FC>\n\n··/**\n···*·Entry·objects·used·by·{@link·LRUCache#load}·and·{@link·LRUCache#dump},\n···*·and·returned·by·{@link·LRUCache#info}.\n···*/\n··export·interface·Entry<V>·{\n····value:·V\n····ttl?:·Milliseconds\n····size?:·Size\n····start?:·Milliseconds\n··}\n}\n\n/**\n·*·Default·export,·the·thing·you're·using·this·module·to·get.\n·*\n·*·The·`K`·and·`V`·types·define·the·key·and·value·types,·respectively.·The\n·*·optional·`FC`·type·defines·the·type·of·the·`context`·object·passed·to\n·*·`cache.fetch()`·and·`cache.memo()`.\n·*\n·*·Keys·and·values·**must·not**·be·`null`·or·`undefined`.\n·*\n·*·All·properties·from·the·options·object·(with·the·exception·of·`max`,\n·*·`maxSize`,·`fetchMethod`,·`memoMethod`,·`dispose`·and·`disposeAfter`)·are\n·*·added·as·normal·public·members.·(The·listed·options·are·read-only·getters.)\n·*\n·*·Changing·any·of·these·will·alter·the·defaults·for·subsequent·method·calls.\n·*/\nexport·class·LRUCache<K·extends·{},·V·extends·{},·FC·=·unknown>·{\n··//·options·that·cannot·be·changed·without·disaster\n··readonly·#max:·LRUCache.Count\n··readonly·#maxSize:·LRUCache.Size\n··readonly·#dispose?:·LRUCache.Disposer<K,·V>\n··readonly·#onInsert?:·LRUCache.Inserter<K,·V>\n··readonly·#disposeAfter?:·LRUCache.Disposer<K,·V>\n··readonly·#fetchMethod?:·LRUCache.Fetcher<K,·V,·FC>\n··readonly·#memoMethod?:·LRUCache.Memoizer<K,·V,·FC>\n··readonly·#perf:·Perf\n\n··/**\n···*·{@link·LRUCache.OptionsBase.perf}\n···*/\n··get·perf()·{\n····return·this.#perf\n··}\n\n··/**\n···*·{@link·LRUCache.OptionsBase.ttl}\n···*/\n··ttl:·LRUCache.Milliseconds\n\n··/**\n···*·{@link·LRUCache.OptionsBase.ttlResolution}\n···*/\n··ttlResolution:·LRUCache.Milliseconds\n··/**\n···*·{@link·LRUCache.OptionsBase.ttlAutopurge}\n···*/\n··ttlAutopurge:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.updateAgeOnGet}\n···*/\n··updateAgeOnGet:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.updateAgeOnHas}\n···*/\n··updateAgeOnHas:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.allowStale}\n···*/\n··allowStale:·boolean\n\n··/**\n···*·{@link·LRUCache.OptionsBase.noDisposeOnSet}\n···*/\n··noDisposeOnSet:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.noUpdateTTL}\n···*/\n··noUpdateTTL:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.maxEntrySize}\n···*/\n··maxEntrySize:·LRUCache.Size\n··/**\n···*·{@link·LRUCache.OptionsBase.sizeCalculation}\n···*/\n··sizeCalculation?:·LRUCache.SizeCalculator<K,·V>\n··/**\n···*·{@link·LRUCache.OptionsBase.noDeleteOnFetchRejection}\n···*/\n··noDeleteOnFetchRejection:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.noDeleteOnStaleGet}\n···*/\n··noDeleteOnStaleGet:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.allowStaleOnFetchAbort}\n···*/\n··allowStaleOnFetchAbort:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.allowStaleOnFetchRejection}\n···*/\n··allowStaleOnFetchRejection:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.ignoreFetchAbort}\n···*/\n··ignoreFetchAbort:·boolean\n\n··//·computed·properties\n··#size:·LRUCache.Count\n··#calculatedSize:·LRUCache.Size\n··#keyMap:·Map<K,·Index>\n··#keyList:·(K·|·undefined)[]\n··#valList:·(V·|·BackgroundFetch<V>·|·undefined)[]\n··#next:·NumberArray\n··#prev:·NumberArray\n··#head:·Index\n··#tail:·Index\n··#free:·StackLike\n··#disposed?:·DisposeTask<K,·V>[]\n··#sizes?:·ZeroArray\n··#starts?:·ZeroArray\n··#ttls?:·ZeroArray\n··#autopurgeTimers?:·(undefined·|·ReturnType<typeof·setTimeout>)[]\n\n··#hasDispose:·boolean\n··#hasFetchMethod:·boolean\n··#hasDisposeAfter:·boolean\n··#hasOnInsert:·boolean\n\n··/**\n···*·Do·not·call·this·method·unless·you·need·to·inspect·the\n···*·inner·workings·of·the·cache.··If·anything·returned·by·this\n···*·object·is·modified·in·any·way,·strange·breakage·may·occur.\n···*\n···*·These·fields·are·private·for·a·reason!\n···*\n···*·@internal\n···*/\n··static·unsafeExposeInternals<\n····K·extends·{},\n····V·extends·{},\n····FC·extends·unknown·=·unknown,\n··>(c:·LRUCache<K,·V,·FC>)·{\n····return·{\n······//·properties\n······starts:·c.#starts,\n······ttls:·c.#ttls,\n······autopurgeTimers:·c.#autopurgeTimers,\n······sizes:·c.#sizes,\n······keyMap:·c.#keyMap·as·Map<K,·number>,\n······keyList:·c.#keyList,\n······valList:·c.#valList,\n······next:·c.#next,\n······prev:·c.#prev,\n······get·head()·{\n········return·c.#head\n······},\n······get·tail()·{\n········return·c.#tail\n······},\n······free:·c.#free,\n······//·methods\n······isBackgroundFetch:·(p:·unknown)·=>·c.#isBackgroundFetch(p),\n······backgroundFetch:·(\n········k:·K,\n········index:·number·|·undefined,\n········options:·LRUCache.FetchOptions<K,·V,·FC>,\n········context:·unknown,\n······):·BackgroundFetch<V>·=>\n········c.#backgroundFetch(\n··········k,\n··········index·as·Index·|·undefined,\n··········options,\n··········context·as·FC,\n········),\n······moveToTail:·(index:·number):·void·=>·c.#moveToTail(index·as·Index),\n······indexes:·(options?:·{·allowStale:·boolean·})·=>·c.#indexes(options),\n······rindexes:·(options?:·{·allowStale:·boolean·})·=>\n········c.#rindexes(options),\n······isStale:·(index:·number·|·undefined)·=>·c.#isStale(index·as·Index),\n····}\n··}\n\n··//·Protected·read-only·members\n\n··/**\n···*·{@link·LRUCache.OptionsBase.max}·(read-only)\n···*/\n··get·max():·LRUCache.Count·{\n····return·this.#max\n··}\n··/**\n···*·{@link·LRUCache.OptionsBase.maxSize}·(read-only)\n···*/\n··get·maxSize():·LRUCache.Count·{\n····return·this.#maxSize\n··}\n··/**\n···*·The·total·computed·size·of·items·in·the·cache·(read-only)\n···*/\n··get·calculatedSize():·LRUCache.Size·{\n····return·this.#calculatedSize\n··}\n··/**\n···*·The·number·of·items·stored·in·the·cache·(read-only)\n···*/\n··get·size():·LRUCache.Count·{\n····return·this.#size\n··}\n··/**\n···*·{@link·LRUCache.OptionsBase.fetchMethod}·(read-only)\n···*/\n··get·fetchMethod():·LRUCache.Fetcher<K,·V,·FC>·|·undefined·{\n····return·this.#fetchMethod\n··}\n··get·memoMethod():·LRUCache.Memoizer<K,·V,·FC>·|·undefined·{\n····return·this.#memoMethod\n··}\n··/**\n···*·{@link·LRUCache.OptionsBase.dispose}·(read-only)\n···*/\n··get·dispose()·{\n····return·this.#dispose\n··}\n··/**\n···*·{@link·LRUCache.OptionsBase.onInsert}·(read-only)\n···*/\n··get·onInsert()·{\n····return·this.#onInsert\n··}\n··/**\n···*·{@link·LRUCache.OptionsBase.disposeAfter}·(read-only)\n···*/\n··get·disposeAfter()·{\n····return·this.#disposeAfter\n··}\n\n··constructor(options:·LRUCache.Options<K,·V,·FC>·|·LRUCache<K,·V,·FC>)·{\n····const·{\n······max·=·0,\n······ttl,\n······ttlResolution·=·1,\n······ttlAutopurge,\n······updateAgeOnGet,\n······updateAgeOnHas,\n······allowStale,\n······dispose,\n······onInsert,\n······disposeAfter,\n······noDisposeOnSet,\n······noUpdateTTL,\n······maxSize·=·0,\n······maxEntrySize·=·0,\n······sizeCalculation,\n······fetchMethod,\n······memoMethod,\n······noDeleteOnFetchRejection,\n······noDeleteOnStaleGet,\n······allowStaleOnFetchRejection,\n······allowStaleOnFetchAbort,\n······ignoreFetchAbort,\n······perf,\n····}·=·options\n\n····if·(perf·!==·undefined)·{\n······if·(typeof·perf?.now·!==·'function')·{\n········throw·new·TypeError(\n··········'perf·option·must·have·a·now()·method·if·specified',\n········)\n······}\n····}\n\n····this.#perf·=·perf·??·defaultPerf\n\n····if·(max·!==·0·&&·!isPosInt(max))·{\n······throw·new·TypeError('max·option·must·be·a·nonnegative·integer')\n····}\n\n····const·UintArray·=·max·?·getUintArray(max)·:·Array\n····if·(!UintArray)·{\n······throw·new·Error('invalid·max·value:·'·+·max)\n····}\n\n····this.#max·=·max\n····this.#maxSize·=·maxSize\n····this.maxEntrySize·=·maxEntrySize·||·this.#maxSize\n····this.sizeCalculation·=·sizeCalculation\n····if·(this.sizeCalculation)·{\n······if·(!this.#maxSize·&&·!this.maxEntrySize)·{\n········throw·new·TypeError(\n··········'cannot·set·sizeCalculation·without·setting·maxSize·or·maxEntrySize',\n········)\n······}\n······if·(typeof·this.sizeCalculation·!==·'function')·{\n········throw·new·TypeError('sizeCalculation·set·to·non-function')\n······}\n····}\n\n····if·(memoMethod·!==·undefined·&&·typeof·memoMethod·!==·'function')·{\n······throw·new·TypeError('memoMethod·must·be·a·function·if·defined')\n····}\n····this.#memoMethod·=·memoMethod\n\n····if·(fetchMethod·!==·undefined·&&·typeof·fetchMethod·!==·'function')·{\n······throw·new·TypeError('fetchMethod·must·be·a·function·if·specified')\n····}\n····this.#fetchMethod·=·fetchMethod\n····this.#hasFetchMethod·=·!!fetchMethod\n\n····this.#keyMap·=·new·Map()\n····this.#keyList·=·Array.from({·length:·max·}).fill(undefined)·as·(\n······|·K\n······|·undefined\n····)[]\n····this.#valList·=·Array.from({·length:·max·}).fill(undefined)·as·(\n······|·V\n······|·undefined\n····)[]\n····this.#next·=·new·UintArray(max)\n····this.#prev·=·new·UintArray(max)\n····this.#head·=·0·as·Index\n····this.#tail·=·0·as·Index\n····this.#free·=·Stack.create(max)\n····this.#size·=·0\n····this.#calculatedSize·=·0\n\n····if·(typeof·dispose·===·'function')·{\n······this.#dispose·=·dispose\n····}\n····if·(typeof·onInsert·===·'function')·{\n······this.#onInsert·=·onInsert\n····}\n····if·(typeof·disposeAfter·===·'function')·{\n······this.#disposeAfter·=·disposeAfter\n······this.#disposed·=·[]\n····}·else·{\n······this.#disposeAfter·=·undefined\n······this.#disposed·=·undefined\n····}\n····this.#hasDispose·=·!!this.#dispose\n····this.#hasOnInsert·=·!!this.#onInsert\n····this.#hasDisposeAfter·=·!!this.#disposeAfter\n\n····this.noDisposeOnSet·=·!!noDisposeOnSet\n····this.noUpdateTTL·=·!!noUpdateTTL\n····this.noDeleteOnFetchRejection·=·!!noDeleteOnFetchRejection\n····this.allowStaleOnFetchRejection·=·!!allowStaleOnFetchRejection\n····this.allowStaleOnFetchAbort·=·!!allowStaleOnFetchAbort\n····this.ignoreFetchAbort·=·!!ignoreFetchAbort\n\n····//·NB:·maxEntrySize·is·set·to·maxSize·if·it's·set\n····if·(this.maxEntrySize·!==·0)·{\n······if·(this.#maxSize·!==·0)·{\n········if·(!isPosInt(this.#maxSize))·{\n··········throw·new·TypeError(\n············'maxSize·must·be·a·positive·integer·if·specified',\n··········)\n········}\n······}\n······if·(!isPosInt(this.maxEntrySize))·{\n········throw·new·TypeError(\n··········'maxEntrySize·must·be·a·positive·integer·if·specified',\n········)\n······}\n······this.#initializeSizeTracking()\n····}\n\n····this.allowStale·=·!!allowStale\n····this.noDeleteOnStaleGet·=·!!noDeleteOnStaleGet\n····this.updateAgeOnGet·=·!!updateAgeOnGet\n····this.updateAgeOnHas·=·!!updateAgeOnHas\n····this.ttlResolution·=\n······isPosInt(ttlResolution)·||·ttlResolution·===·0·?·ttlResolution·:·1\n····this.ttlAutopurge·=·!!ttlAutopurge\n····this.ttl·=·ttl·||·0\n····if·(this.ttl)·{\n······if·(!isPosInt(this.ttl))·{\n········throw·new·TypeError('ttl·must·be·a·positive·integer·if·specified')\n······}\n······this.#initializeTTLTracking()\n····}\n\n····//·do·not·allow·completely·unbounded·caches\n····if·(this.#max·===·0·&&·this.ttl·===·0·&&·this.#maxSize·===·0)·{\n······throw·new·TypeError(\n········'At·least·one·of·max,·maxSize,·or·ttl·is·required',\n······)\n····}\n····if·(!this.ttlAutopurge·&&·!this.#max·&&·!this.#maxSize)·{\n······const·code·=·'LRU_CACHE_UNBOUNDED'\n······if·(shouldWarn(code))·{\n········warned.add(code)\n········const·msg·=\n··········'TTL·caching·without·ttlAutopurge,·max,·or·maxSize·can·'·+\n··········'result·in·unbounded·memory·consumption.'\n········emitWarning(msg,·'UnboundedCacheWarning',·code,·LRUCache)\n······}\n····}\n··}\n\n··/**\n···*·Return·the·number·of·ms·left·in·the·item's·TTL.·If·item·is·not·in·cache,\n···*·returns·`0`.·Returns·`Infinity`·if·item·is·in·cache·without·a·defined·TTL.\n···*/\n··getRemainingTTL(key:·K)·{\n····return·this.#keyMap.has(key)·?·Infinity·:·0\n··}\n\n··#initializeTTLTracking()·{\n····const·ttls·=·new·ZeroArray(this.#max)\n····const·starts·=·new·ZeroArray(this.#max)\n····this.#ttls·=·ttls\n····this.#starts·=·starts\n····const·purgeTimers·=\n······this.ttlAutopurge·?\n········Array.from<undefined·|·ReturnType<typeof·setTimeout>>({\n··········length:·this.#max,\n········})\n······:·undefined\n····this.#autopurgeTimers·=·purgeTimers\n\n····this.#setItemTTL·=·(index,·ttl,·start·=·this.#perf.now())·=>·{\n······starts[index]·=·ttl·!==·0·?·start·:·0\n······ttls[index]·=·ttl\n······setPurgetTimer(index,·ttl)\n····}\n\n····this.#updateItemAge·=·index·=>·{\n······starts[index]·=·ttls[index]·!==·0·?·this.#perf.now()·:·0\n······setPurgetTimer(index,·ttls[index])\n····}\n\n····//·clear·out·the·purge·timer·if·we're·setting·TTL·to·0,·and\n····//·previously·had·a·ttl·purge·timer·running,·so·it·doesn't\n····//·fire·unnecessarily.·Don't·need·to·do·this·if·we're·not·doing\n····//·autopurge.\n····const·setPurgetTimer·=\n······!this.ttlAutopurge·?\n········()·=>·{}\n······:·(index:·Index,·ttl?:·number)·=>·{\n··········if·(purgeTimers?.[index])·{\n············clearTimeout(purgeTimers[index])\n············purgeTimers[index]·=·undefined\n··········}\n··········if·(ttl·&&·ttl·!==·0·&&·purgeTimers)·{\n············const·t·=·setTimeout(()·=>·{\n··············if·(this.#isStale(index))·{\n················this.#delete(this.#keyList[index]·as·K,·'expire')\n··············}\n············},·ttl·+·1)\n············//·unref()·not·supported·on·all·platforms\n············/*·c8·ignore·start·*/\n············if·(t.unref)·{\n··············t.unref()\n············}\n············/*·c8·ignore·stop·*/\n············purgeTimers[index]·=·t\n··········}\n········}\n\n····this.#statusTTL·=·(status,·index)·=>·{\n······if·(ttls[index])·{\n········const·ttl·=·ttls[index]\n········const·start·=·starts[index]\n········/*·c8·ignore·start·*/\n········if·(!ttl·||·!start)·{\n··········return\n········}\n········/*·c8·ignore·stop·*/\n········status.ttl·=·ttl\n········status.start·=·start\n········status.now·=·cachedNow·||·getNow()\n········const·age·=·status.now·-·start\n········status.remainingTTL·=·ttl·-·age\n······}\n····}\n\n····//·debounce·calls·to·perf.now()·to·1s·so·we're·not·hitting\n····//·that·costly·call·repeatedly.\n····let·cachedNow·=·0\n····const·getNow·=·()·=>·{\n······const·n·=·this.#perf.now()\n······if·(this.ttlResolution·>·0)·{\n········cachedNow·=·n\n········const·t·=·setTimeout(()·=>·(cachedNow·=·0),·this.ttlResolution)\n········//·not·available·on·all·platforms\n········/*·c8·ignore·start·*/\n········if·(t.unref)·{\n··········t.unref()\n········}\n········/*·c8·ignore·stop·*/\n······}\n······return·n\n····}\n\n····this.getRemainingTTL·=·key·=>·{\n······const·index·=·this.#keyMap.get(key)\n······if·(index·===·undefined)·{\n········return·0\n······}\n······const·ttl·=·ttls[index]\n······const·start·=·starts[index]\n······if·(!ttl·||·!start)·{\n········return·Infinity\n······}\n······const·age·=·(cachedNow·||·getNow())·-·start\n······return·ttl·-·age\n····}\n\n····this.#isStale·=·index·=>·{\n······const·s·=·starts[index]\n······const·t·=·ttls[index]\n······return·!!t·&&·!!s·&&·(cachedNow·||·getNow())·-·s·>·t\n····}\n··}\n\n··//·conditionally·set·private·methods·related·to·TTL\n··#updateItemAge:·(index:·Index)·=>·void·=·()·=>·{}\n··#statusTTL:·(status:·LRUCache.Status<K,·V>,·index:·Index)·=>·void·=\n····()·=>·{}\n··#setItemTTL:·(\n····index:·Index,\n····ttl:·LRUCache.Milliseconds,\n····start?:·LRUCache.Milliseconds,\n····//·ignore·because·we·never·call·this·if·we're·not·already·in·TTL·mode\n····/*·c8·ignore·start·*/\n··)·=>·void·=·()·=>·{}\n··/*·c8·ignore·stop·*/\n\n··#isStale:·(index:·Index)·=>·boolean·=·()·=>·false\n\n··#initializeSizeTracking()·{\n····const·sizes·=·new·ZeroArray(this.#max)\n····this.#calculatedSize·=·0\n····this.#sizes·=·sizes\n····this.#removeItemSize·=·index·=>·{\n······this.#calculatedSize·-=·sizes[index]·as·number\n······sizes[index]·=·0\n····}\n····this.#requireSize·=·(k,·v,·size,·sizeCalculation)·=>·{\n······//·provisionally·accept·background·fetches.\n······//·actual·value·size·will·be·checked·when·they·return.\n······if·(this.#isBackgroundFetch(v))·{\n········return·0\n······}\n······if·(!isPosInt(size))·{\n········if·(sizeCalculation)·{\n··········if·(typeof·sizeCalculation·!==·'function')·{\n············throw·new·TypeError('sizeCalculation·must·be·a·function')\n··········}\n··········size·=·sizeCalculation(v,·k)\n··········if·(!isPosInt(size))·{\n············throw·new·TypeError(\n··············'sizeCalculation·return·invalid·(expect·positive·integer)',\n············)\n··········}\n········}·else·{\n··········throw·new·TypeError(\n············'invalid·size·value·(must·be·positive·integer).·'·+\n··············'When·maxSize·or·maxEntrySize·is·used,·sizeCalculation·'·+\n··············'or·size·must·be·set.',\n··········)\n········}\n······}\n······return·size\n····}\n\n····this.#addItemSize·=·(\n······index:·Index,\n······size:·LRUCache.Size,\n······status?:·LRUCache.Status<K,·V>,\n····)·=>·{\n······sizes[index]·=·size\n······if·(this.#maxSize)·{\n········const·maxSize·=·this.#maxSize·-·(sizes[index]·as·number)\n········while·(this.#calculatedSize·>·maxSize)·{\n··········this.#evict(true)\n········}\n······}\n······this.#calculatedSize·+=·sizes[index]·as·number\n······if·(status)·{\n········status.entrySize·=·size\n········status.totalCalculatedSize·=·this.#calculatedSize\n······}\n····}\n··}\n\n··#removeItemSize:·(index:·Index)·=>·void·=·_i·=>·{}\n\n··#addItemSize:·(\n····index:·Index,\n····size:·LRUCache.Size,\n····status?:·LRUCache.Status<K,·V>,\n··)·=>·void·=·(_i,·_s,·_st)·=>·{}\n\n··#requireSize:·(\n····k:·K,\n····v:·V·|·BackgroundFetch<V>,\n····size?:·LRUCache.Size,\n····sizeCalculation?:·LRUCache.SizeCalculator<K,·V>,\n····status?:·LRUCache.Status<K,·V>,\n··)·=>·LRUCache.Size·=·(\n····_k:·K,\n····_v:·V·|·BackgroundFetch<V>,\n····size?:·LRUCache.Size,\n····sizeCalculation?:·LRUCache.SizeCalculator<K,·V>,\n··)·=>·{\n····if·(size·||·sizeCalculation)·{\n······throw·new·TypeError(\n········'cannot·set·size·without·setting·maxSize·or·maxEntrySize·on·cache',\n······)\n····}\n····return·0\n··};\n\n··*#indexes({·allowStale·=·this.allowStale·}·=·{})·{\n····if·(this.#size)·{\n······for·(let·i·=·this.#tail;·this.#isValidIndex(i);·)·{\n········if·(allowStale·||·!this.#isStale(i))·{\n··········yield·i\n········}\n········if·(i·===·this.#head)·{\n··········break\n········}·else·{\n··········i·=·this.#prev[i]·as·Index\n········}\n······}\n····}\n··}\n\n··*#rindexes({·allowStale·=·this.allowStale·}·=·{})·{\n····if·(this.#size)·{\n······for·(let·i·=·this.#head;·this.#isValidIndex(i);·)·{\n········if·(allowStale·||·!this.#isStale(i))·{\n··········yield·i\n········}\n········if·(i·===·this.#tail)·{\n··········break\n········}·else·{\n··········i·=·this.#next[i]·as·Index\n········}\n······}\n····}\n··}\n\n··#isValidIndex(index:·Index)·{\n····return·(\n······index·!==·undefined·&&\n······this.#keyMap.get(this.#keyList[index]·as·K)·===·index\n····)\n··}\n\n··/**\n···*·Return·a·generator·yielding·`[key,·value]`·pairs,\n···*·in·order·from·most·recently·used·to·least·recently·used.\n···*/\n··*entries()·{\n····for·(const·i·of·this.#indexes())·{\n······if·(\n········this.#valList[i]·!==·undefined·&&\n········this.#keyList[i]·!==·undefined·&&\n········!this.#isBackgroundFetch(this.#valList[i])\n······)·{\n········yield·[this.#keyList[i],·this.#valList[i]]·as·[K,·V]\n······}\n····}\n··}\n\n··/**\n···*·Inverse·order·version·of·{@link·LRUCache.entries}\n···*\n···*·Return·a·generator·yielding·`[key,·value]`·pairs,\n···*·in·order·from·least·recently·used·to·most·recently·used.\n···*/\n··*rentries()·{\n····for·(const·i·of·this.#rindexes())·{\n······if·(\n········this.#valList[i]·!==·undefined·&&\n········this.#keyList[i]·!==·undefined·&&\n········!this.#isBackgroundFetch(this.#valList[i])\n······)·{\n········yield·[this.#keyList[i],·this.#valList[i]]\n······}\n····}\n··}\n\n··/**\n···*·Return·a·generator·yielding·the·keys·in·the·cache,\n···*·in·order·from·most·recently·used·to·least·recently·used.\n···*/\n··*keys()·{\n····for·(const·i·of·this.#indexes())·{\n······const·k·=·this.#keyList[i]\n······if·(k·!==·undefined·&&·!this.#isBackgroundFetch(this.#valList[i]))·{\n········yield·k\n······}\n····}\n··}\n\n··/**\n···*·Inverse·order·version·of·{@link·LRUCache.keys}\n···*\n···*·Return·a·generator·yielding·the·keys·in·the·cache,\n···*·in·order·from·least·recently·used·to·most·recently·used.\n···*/\n··*rkeys()·{\n····for·(const·i·of·this.#rindexes())·{\n······const·k·=·this.#keyList[i]\n······if·(k·!==·undefined·&&·!this.#isBackgroundFetch(this.#valList[i]))·{\n········yield·k\n······}\n····}\n··}\n\n··/**\n···*·Return·a·generator·yielding·the·values·in·the·cache,\n···*·in·order·from·most·recently·used·to·least·recently·used.\n···*/\n··*values()·{\n····for·(const·i·of·this.#indexes())·{\n······const·v·=·this.#valList[i]\n······if·(v·!==·undefined·&&·!this.#isBackgroundFetch(this.#valList[i]))·{\n········yield·this.#valList[i]·as·V\n······}\n····}\n··}\n\n··/**\n···*·Inverse·order·version·of·{@link·LRUCache.values}\n···*\n···*·Return·a·generator·yielding·the·values·in·the·cache,\n···*·in·order·from·least·recently·used·to·most·recently·used.\n···*/\n··*rvalues()·{\n····for·(const·i·of·this.#rindexes())·{\n······const·v·=·this.#valList[i]\n······if·(v·!==·undefined·&&·!this.#isBackgroundFetch(this.#valList[i]))·{\n········yield·this.#valList[i]\n······}\n····}\n··}\n\n··/**\n···*·Iterating·over·the·cache·itself·yields·the·same·results·as\n···*·{@link·LRUCache.entries}\n···*/\n··[Symbol.iterator]()·{\n····return·this.entries()\n··}\n\n··/**\n···*·A·String·value·that·is·used·in·the·creation·of·the·default·string\n···*·description·of·an·object.·Called·by·the·built-in·method\n···*·`Object.prototype.toString`.\n···*/\n··[Symbol.toStringTag]·=·'LRUCache'\n\n··/**\n···*·Find·a·value·for·which·the·supplied·fn·method·returns·a·truthy·value,\n···*·similar·to·`Array.find()`.·fn·is·called·as·`fn(value,·key,·cache)`.\n···*/\n··find(\n····fn:·(v:·V,·k:·K,·self:·LRUCache<K,·V,·FC>)·=>·boolean,\n····getOptions:·LRUCache.GetOptions<K,·V,·FC>·=·{},\n··)·{\n····for·(const·i·of·this.#indexes())·{\n······const·v·=·this.#valList[i]\n······const·value·=·this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n······if·(value·===·undefined)·continue\n······if·(fn(value,·this.#keyList[i]·as·K,·this))·{\n········return·this.#get(this.#keyList[i]·as·K,·getOptions)\n······}\n····}\n··}\n\n··/**\n···*·Call·the·supplied·function·on·each·item·in·the·cache,·in·order·from·most\n···*·recently·used·to·least·recently·used.\n···*\n···*·`fn`·is·called·as·`fn(value,·key,·cache)`.\n···*\n···*·If·`thisp`·is·provided,·function·will·be·called·in·the·`this`-context·of\n···*·the·provided·object,·or·the·cache·if·no·`thisp`·object·is·provided.\n···*\n···*·Does·not·update·age·or·recenty·of·use,·or·iterate·over·stale·values.\n···*/\n··forEach(\n····fn:·(v:·V,·k:·K,·self:·LRUCache<K,·V,·FC>)·=>·unknown,\n····thisp:·unknown·=·this,\n··)·{\n····for·(const·i·of·this.#indexes())·{\n······const·v·=·this.#valList[i]\n······const·value·=·this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n······if·(value·===·undefined)·continue\n······fn.call(thisp,·value,·this.#keyList[i]·as·K,·this)\n····}\n··}\n\n··/**\n···*·The·same·as·{@link·LRUCache.forEach}·but·items·are·iterated·over·in\n···*·reverse·order.··(ie,·less·recently·used·items·are·iterated·over·first.)\n···*/\n··rforEach(\n····fn:·(v:·V,·k:·K,·self:·LRUCache<K,·V,·FC>)·=>·unknown,\n····thisp:·unknown·=·this,\n··)·{\n····for·(const·i·of·this.#rindexes())·{\n······const·v·=·this.#valList[i]\n······const·value·=·this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n······if·(value·===·undefined)·continue\n······fn.call(thisp,·value,·this.#keyList[i]·as·K,·this)\n····}\n··}\n\n··/**\n···*·Delete·any·stale·entries.·Returns·true·if·anything·was·removed,\n···*·false·otherwise.\n···*/\n··purgeStale()·{\n····let·deleted·=·false\n····for·(const·i·of·this.#rindexes({·allowStale:·true·}))·{\n······if·(this.#isStale(i))·{\n········this.#delete(this.#keyList[i]·as·K,·'expire')\n········deleted·=·true\n······}\n····}\n····return·deleted\n··}\n\n··/**\n···*·Get·the·extended·info·about·a·given·entry,·to·get·its·value,·size,·and\n···*·TTL·info·simultaneously.·Returns·`undefined`·if·the·key·is·not·present.\n···*\n···*·Unlike·{@link·LRUCache#dump},·which·is·designed·to·be·portable·and·survive\n···*·serialization,·the·`start`·value·is·always·the·current·timestamp,·and·the\n···*·`ttl`·is·a·calculated·remaining·time·to·live·(negative·if·expired).\n···*\n···*·Always·returns·stale·values,·if·their·info·is·found·in·the·cache,·so·be\n···*·sure·to·check·for·expirations·(ie,·a·negative·{@link·LRUCache.Entry#ttl})\n···*·if·relevant.\n···*/\n··info(key:·K):·LRUCache.Entry<V>·|·undefined·{\n····const·i·=·this.#keyMap.get(key)\n····if·(i·===·undefined)·return·undefined\n····const·v·=·this.#valList[i]\n····/*·c8·ignore·start·-·this·isn't·tested·for·the·info·function,\n·····*·but·it's·the·same·logic·as·found·in·other·places.·*/\n····const·value:·V·|·undefined·=\n······this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n····if·(value·===·undefined)·return·undefined\n····/*·c8·ignore·stop·*/\n····const·entry:·LRUCache.Entry<V>·=·{·value·}\n····if·(this.#ttls·&&·this.#starts)·{\n······const·ttl·=·this.#ttls[i]\n······const·start·=·this.#starts[i]\n······if·(ttl·&&·start)·{\n········const·remain·=·ttl·-·(this.#perf.now()·-·start)\n········entry.ttl·=·remain\n········entry.start·=·Date.now()\n······}\n····}\n····if·(this.#sizes)·{\n······entry.size·=·this.#sizes[i]\n····}\n····return·entry\n··}\n\n··/**\n···*·Return·an·array·of·[key,·{@link·LRUCache.Entry}]·tuples·which·can·be\n···*·passed·to·{@link·LRUCache#load}.\n···*\n···*·The·`start`·fields·are·calculated·relative·to·a·portable·`Date.now()`\n···*·timestamp,·even·if·`performance.now()`·is·available.\n···*\n···*·Stale·entries·are·always·included·in·the·`dump`,·even·if\n···*·{@link·LRUCache.OptionsBase.allowStale}·is·false.\n···*\n···*·Note:·this·returns·an·actual·array,·not·a·generator,·so·it·can·be·more\n···*·easily·passed·around.\n···*/\n··dump()·{\n····const·arr:·[K,·LRUCache.Entry<V>][]·=·[]\n····for·(const·i·of·this.#indexes({·allowStale:·true·}))·{\n······const·key·=·this.#keyList[i]\n······const·v·=·this.#valList[i]\n······const·value:·V·|·undefined·=\n········this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n······if·(value·===·undefined·||·key·===·undefined)·continue\n······const·entry:·LRUCache.Entry<V>·=·{·value·}\n······if·(this.#ttls·&&·this.#starts)·{\n········entry.ttl·=·this.#ttls[i]\n········//·always·dump·the·start·relative·to·a·portable·timestamp\n········//·it's·ok·for·this·to·be·a·bit·slow,·it's·a·rare·operation.\n········const·age·=·this.#perf.now()·-·(this.#starts[i]·as·number)\n········entry.start·=·Math.floor(Date.now()·-·age)\n······}\n······if·(this.#sizes)·{\n········entry.size·=·this.#sizes[i]\n······}\n······arr.unshift([key,·entry])\n····}\n····return·arr\n··}\n\n··/**\n···*·Reset·the·cache·and·load·in·the·items·in·entries·in·the·order·listed.\n···*\n···*·The·shape·of·the·resulting·cache·may·be·different·if·the·same·options·are\n···*·not·used·in·both·caches.\n···*\n···*·The·`start`·fields·are·assumed·to·be·calculated·relative·to·a·portable\n···*·`Date.now()`·timestamp,·even·if·`performance.now()`·is·available.\n···*/\n··load(arr:·[K,·LRUCache.Entry<V>][])·{\n····this.clear()\n····for·(const·[key,·entry]·of·arr)·{\n······if·(entry.start)·{\n········//·entry.start·is·a·portable·timestamp,·but·we·may·be·using\n········//·node's·performance.now(),·so·calculate·the·offset,·so·that\n········//·we·get·the·intended·remaining·TTL,·no·matter·how·long·it's\n········//·been·on·ice.\n········//\n········//·it's·ok·for·this·to·be·a·bit·slow,·it's·a·rare·operation.\n········const·age·=·Date.now()·-·entry.start\n········entry.start·=·this.#perf.now()·-·age\n······}\n······this.#set(key,·entry.value,·entry)\n····}\n··}\n\n··/**\n···*·Add·a·value·to·the·cache.\n···*\n···*·Note:·if·`undefined`·is·specified·as·a·value,·this·is·an·alias·for\n···*·{@link·LRUCache#delete}\n···*\n···*·Fields·on·the·{@link·LRUCache.SetOptions}·options·param·will·override\n···*·their·corresponding·values·in·the·constructor·options·for·the·scope\n···*·of·this·single·`set()`·operation.\n···*\n···*·If·`start`·is·provided,·then·that·will·set·the·effective·start\n···*·time·for·the·TTL·calculation.·Note·that·this·must·be·a·previous\n···*·value·of·`performance.now()`·if·supported,·or·a·previous·value·of\n···*·`Date.now()`·if·not.\n···*\n···*·Options·object·may·also·include·`size`,·which·will·prevent\n···*·calling·the·`sizeCalculation`·function·and·just·use·the·specified\n···*·number·if·it·is·a·positive·integer,·and·`noDisposeOnSet`·which\n···*·will·prevent·calling·a·`dispose`·function·in·the·case·of\n···*·overwrites.\n···*\n···*·If·the·`size`·(or·return·value·of·`sizeCalculation`)·for·a·given\n···*·entry·is·greater·than·`maxEntrySize`,·then·the·item·will·not·be\n···*·added·to·the·cache.\n···*\n···*·Will·update·the·recency·of·the·entry.\n···*\n···*·If·the·value·is·`undefined`,·then·this·is·an·alias·for\n···*·`cache.delete(key)`.·`undefined`·is·never·stored·in·the·cache.\n···*/\n··set(\n····k:·K,\n····v:·V·|·undefined,\n····setOptions:·LRUCache.SetOptions<K,·V,·FC>·=·{},\n··)·{\n····const·{·status·=·metrics.hasSubscribers·?·{}·:·undefined·}·=·setOptions\n····setOptions.status·=·status\n····if·(status)·{\n······status.op·=·'set'\n······status.key·=·k\n······if·(v·!==·undefined)·status.value·=·v\n····}\n····const·result·=·this.#set(k,·v,·setOptions)\n····if·(status·&&·metrics.hasSubscribers)·{\n······metrics.publish(status)\n····}\n····return·result\n··}\n\n··#set(\n····k:·K,\n····v:·V·|·BackgroundFetch<V>·|·undefined,\n····setOptions:·LRUCache.SetOptions<K,·V,·FC>·=·{},\n··)·{\n····const·{\n······ttl·=·this.ttl,\n······start,\n······noDisposeOnSet·=·this.noDisposeOnSet,\n······sizeCalculation·=·this.sizeCalculation,\n······status,\n····}·=·setOptions\n\n····if·(v·===·undefined)·{\n······if·(status)·status.set·=·'deleted'\n······this.delete(k)\n······return·this\n····}\n····let·{·noUpdateTTL·=·this.noUpdateTTL·}·=·setOptions\n\n····if·(status·&&·!this.#isBackgroundFetch(v))·status.value·=·v\n\n····const·size·=·this.#requireSize(\n······k,\n······v,\n······setOptions.size·||·0,\n······sizeCalculation,\n······status,\n····)\n····//·if·the·item·doesn't·fit,·don't·do·anything\n····//·NB:·maxEntrySize·set·to·maxSize·by·default\n····if·(this.maxEntrySize·&&·size·>·this.maxEntrySize)·{\n······//·have·to·delete,·in·case·something·is·there·already.\n······this.#delete(k,·'set')\n······if·(status)·{\n········status.set·=·'miss'\n········status.maxEntrySizeExceeded·=·true\n······}\n······return·this\n····}\n····let·index·=·this.#size·===·0·?·undefined·:·this.#keyMap.get(k)\n····if·(index·===·undefined)·{\n······//·addition\n······index·=·(\n········this.#size·===·0·?·this.#tail\n········:·this.#free.length·!==·0·?·this.#free.pop()\n········:·this.#size·===·this.#max·?·this.#evict(false)\n········:·this.#size)·as·Index\n······this.#keyList[index]·=·k\n······this.#valList[index]·=·v\n······this.#keyMap.set(k,·index)\n······this.#next[this.#tail]·=·index\n······this.#prev[index]·=·this.#tail\n······this.#tail·=·index\n······this.#size++\n······this.#addItemSize(index,·size,·status)\n······if·(status)·status.set·=·'add'\n······noUpdateTTL·=·false\n······if·(this.#hasOnInsert)·{\n········this.#onInsert?.(v·as·V,·k,·'add')\n······}\n····}·else·{\n······//·update\n······this.#moveToTail(index)\n······const·oldVal·=·this.#valList[index]·as·V·|·BackgroundFetch<V>\n······if·(v·!==·oldVal)·{\n········if·(this.#hasFetchMethod·&&·this.#isBackgroundFetch(oldVal))·{\n··········oldVal.__abortController.abort(new·Error('replaced'))\n··········const·{·__staleWhileFetching:·s·}·=·oldVal\n··········if·(s·!==·undefined·&&·!noDisposeOnSet)·{\n············if·(this.#hasDispose)·{\n··············this.#dispose?.(s·as·V,·k,·'set')\n············}\n············if·(this.#hasDisposeAfter)·{\n··············this.#disposed?.push([s·as·V,·k,·'set'])\n············}\n··········}\n········}·else·if·(!noDisposeOnSet)·{\n··········if·(this.#hasDispose)·{\n············this.#dispose?.(oldVal·as·V,·k,·'set')\n··········}\n··········if·(this.#hasDisposeAfter)·{\n············this.#disposed?.push([oldVal·as·V,·k,·'set'])\n··········}\n········}\n········this.#removeItemSize(index)\n········this.#addItemSize(index,·size,·status)\n········this.#valList[index]·=·v\n········if·(status)·{\n··········status.set·=·'replace'\n··········const·oldValue·=\n············oldVal·&&·this.#isBackgroundFetch(oldVal)·?\n··············oldVal.__staleWhileFetching\n············:·oldVal\n··········if·(oldValue·!==·undefined)·status.oldValue·=·oldValue\n········}\n······}·else·if·(status)·{\n········status.set·=·'update'\n······}\n\n······if·(this.#hasOnInsert)·{\n········this.onInsert?.(v·as·V,·k,·v·===·oldVal·?·'update'·:·'replace')\n······}\n····}\n····if·(ttl·!==·0·&&·!this.#ttls)·{\n······this.#initializeTTLTracking()\n····}\n····if·(this.#ttls)·{\n······if·(!noUpdateTTL)·{\n········this.#setItemTTL(index,·ttl,·start)\n······}\n······if·(status)·this.#statusTTL(status,·index)\n····}\n····if·(!noDisposeOnSet·&&·this.#hasDisposeAfter·&&·this.#disposed)·{\n······const·dt·=·this.#disposed\n······let·task:·DisposeTask<K,·V>·|·undefined\n······while·((task·=·dt?.shift()))·{\n········this.#disposeAfter?.(...task)\n······}\n····}\n····return·this\n··}\n\n··/**\n···*·Evict·the·least·recently·used·item,·returning·its·value·or\n···*·`undefined`·if·cache·is·empty.\n···*/\n··pop():·V·|·undefined·{\n····try·{\n······while·(this.#size)·{\n········const·val·=·this.#valList[this.#head]\n········this.#evict(true)\n········if·(this.#isBackgroundFetch(val))·{\n··········if·(val.__staleWhileFetching)·{\n············return·val.__staleWhileFetching\n··········}\n········}·else·if·(val·!==·undefined)·{\n··········return·val\n········}\n······}\n····}·finally·{\n······if·(this.#hasDisposeAfter·&&·this.#disposed)·{\n········const·dt·=·this.#disposed\n········let·task:·DisposeTask<K,·V>·|·undefined\n········while·((task·=·dt?.shift()))·{\n··········this.#disposeAfter?.(...task)\n········}\n······}\n····}\n··}\n\n··#evict(free:·boolean)·{\n····const·head·=·this.#head\n····const·k·=·this.#keyList[head]·as·K\n····const·v·=·this.#valList[head]·as·V\n····if·(this.#hasFetchMethod·&&·this.#isBackgroundFetch(v))·{\n······v.__abortController.abort(new·Error('evicted'))\n····}·else·if·(this.#hasDispose·||·this.#hasDisposeAfter)·{\n······if·(this.#hasDispose)·{\n········this.#dispose?.(v,·k,·'evict')\n······}\n······if·(this.#hasDisposeAfter)·{\n········this.#disposed?.push([v,·k,·'evict'])\n······}\n····}\n····this.#removeItemSize(head)\n····if·(this.#autopurgeTimers?.[head])·{\n······clearTimeout(this.#autopurgeTimers[head])\n······this.#autopurgeTimers[head]·=·undefined\n····}\n····//·if·we·aren't·about·to·use·the·index,·then·null·these·out\n····if·(free)·{\n······this.#keyList[head]·=·undefined\n······this.#valList[head]·=·undefined\n······this.#free.push(head)\n····}\n····if·(this.#size·===·1)·{\n······this.#head·=·this.#tail·=·0·as·Index\n······this.#free.length·=·0\n····}·else·{\n······this.#head·=·this.#next[head]·as·Index\n····}\n····this.#keyMap.delete(k)\n····this.#size--\n····return·head\n··}\n\n··/**\n···*·Check·if·a·key·is·in·the·cache,·without·updating·the·recency·of·use.\n···*·Will·return·false·if·the·item·is·stale,·even·though·it·is·technically\n···*·in·the·cache.\n···*\n···*·Check·if·a·key·is·in·the·cache,·without·updating·the·recency·of\n···*·use.·Age·is·updated·if·{@link·LRUCache.OptionsBase.updateAgeOnHas}·is·set\n···*·to·`true`·in·either·the·options·or·the·constructor.\n···*\n···*·Will·return·`false`·if·the·item·is·stale,·even·though·it·is·technically·in\n···*·the·cache.·The·difference·can·be·determined·(if·it·matters)·by·using·a\n···*·`status`·argument,·and·inspecting·the·`has`·field.\n···*\n···*·Will·not·update·item·age·unless\n···*·{@link·LRUCache.OptionsBase.updateAgeOnHas}·is·set.\n···*/\n··has(k:·K,·hasOptions:·LRUCache.HasOptions<K,·V,·FC>·=·{})·{\n····const·{·status·=·metrics.hasSubscribers·?·{}·:·undefined·}·=·hasOptions\n····hasOptions.status·=·status\n····if·(status)·{\n······status.op·=·'has'\n······status.key·=·k\n····}\n····const·result·=·this.#has(k,·hasOptions)\n····if·(metrics.hasSubscribers)·metrics.publish(status)\n····return·result\n··}\n··#has(k:·K,·hasOptions:·LRUCache.HasOptions<K,·V,·FC>·=·{})·{\n····const·{·updateAgeOnHas·=·this.updateAgeOnHas,·status·}·=·hasOptions\n····const·index·=·this.#keyMap.get(k)\n····if·(index·!==·undefined)·{\n······const·v·=·this.#valList[index]\n······if·(\n········this.#isBackgroundFetch(v)·&&\n········v.__staleWhileFetching·===·undefined\n······)·{\n········return·false\n······}\n······if·(!this.#isStale(index))·{\n········if·(updateAgeOnHas)·{\n··········this.#updateItemAge(index)\n········}\n········if·(status)·{\n··········status.has·=·'hit'\n··········this.#statusTTL(status,·index)\n········}\n········return·true\n······}·else·if·(status)·{\n········status.has·=·'stale'\n········this.#statusTTL(status,·index)\n······}\n····}·else·if·(status)·{\n······status.has·=·'miss'\n····}\n····return·false\n··}\n\n··/**\n···*·Like·{@link·LRUCache#get}·but·doesn't·update·recency·or·delete·stale\n···*·items.\n···*\n···*·Returns·`undefined`·if·the·item·is·stale,·unless\n···*·{@link·LRUCache.OptionsBase.allowStale}·is·set.\n···*/\n··peek(k:·K,·peekOptions:·LRUCache.PeekOptions<K,·V,·FC>·=·{})·{\n····const·{·status·=·hasSubscribers()·?·{}·:·undefined·}·=·peekOptions\n····if·(status)·{\n······status.op·=·'peek'\n······status.key·=·k\n····}\n····peekOptions.status·=·status\n····const·result·=·this.#peek(k,·peekOptions)\n····if·(metrics.hasSubscribers)·{\n······metrics.publish(status)\n····}\n····return·result\n··}\n··#peek(k:·K,·peekOptions:·LRUCache.PeekOptions<K,·V,·FC>)·{\n····const·{·status,·allowStale·=·this.allowStale·}·=·peekOptions\n····const·index·=·this.#keyMap.get(k)\n····if·(index·===·undefined·||·(!allowStale·&&·this.#isStale(index)))·{\n······if·(status)·status.peek·=·index·===·undefined·?·'miss'·:·'stale'\n······return·undefined\n····}\n····const·v·=·this.#valList[index]\n····const·val·=·this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n····if·(status)·{\n······if·(val·!==·undefined)·{\n········status.peek·=·'hit'\n········status.value·=·val\n······}·else·{\n········status.peek·=·'miss'\n······}\n····}\n····return·val\n··}\n\n··#backgroundFetch(\n····k:·K,\n····index:·Index·|·undefined,\n····options:·LRUCache.FetchOptions<K,·V,·FC>,\n····context:·FC,\n··):·BackgroundFetch<V>·{\n····const·v·=·index·===·undefined·?·undefined·:·this.#valList[index]\n····if·(this.#isBackgroundFetch(v))·{\n······return·v\n····}\n\n····const·ac·=·new·AbortController()\n····const·{·signal·}·=·options\n····//·when/if·our·AC·signals,·then·stop·listening·to·theirs.\n····signal?.addEventListener('abort',·()·=>·ac.abort(signal.reason),·{\n······signal:·ac.signal,\n····})\n\n····const·fetchOpts·=·{\n······signal:·ac.signal,\n······options,\n······context,\n····}\n\n····const·cb·=·(v:·V·|·undefined,·updateCache·=·false):·V·|·undefined·=>·{\n······const·{·aborted·}·=·ac.signal\n······const·ignoreAbort·=·options.ignoreFetchAbort·&&·v·!==·undefined\n······const·proceed·=\n········options.ignoreFetchAbort·||\n········!!(options.allowStaleOnFetchAbort·&&·v·!==·undefined)\n······if·(options.status)·{\n········if·(aborted·&&·!updateCache)·{\n··········options.status.fetchAborted·=·true\n··········options.status.fetchError·=·ac.signal.reason\n··········if·(ignoreAbort)·options.status.fetchAbortIgnored·=·true\n········}·else·{\n··········options.status.fetchResolved·=·true\n········}\n······}\n······if·(aborted·&&·!ignoreAbort·&&·!updateCache)·{\n········return·fetchFail(ac.signal.reason,·proceed)\n······}\n······//·either·we·didn't·abort,·and·are·still·here,·or·we·did,·and·ignored\n······const·bf·=·p·as·BackgroundFetch<V>\n······//·if·nothing·else·has·been·written·there·but·we're·set·to·update·the\n······//·cache·and·ignore·the·abort,·or·if·it's·still·pending·on·this·specific\n······//·background·request,·then·write·it·to·the·cache.\n······const·vl·=·this.#valList[index·as·Index]\n······if·(vl·===·p·||·(vl·===·undefined·&&·ignoreAbort·&&·updateCache))·{\n········if·(v·===·undefined)·{\n··········if·(bf.__staleWhileFetching·!==·undefined)·{\n············this.#valList[index·as·Index]·=·bf.__staleWhileFetching\n··········}·else·{\n············this.#delete(k,·'fetch')\n··········}\n········}·else·{\n··········if·(options.status)·options.status.fetchUpdated·=·true\n··········this.#set(k,·v,·fetchOpts.options)\n········}\n······}\n······return·v\n····}\n\n····const·eb·=·(er:·unknown)·=>·{\n······if·(options.status)·{\n········options.status.fetchRejected·=·true\n········options.status.fetchError·=·er·as·Error\n······}\n······//·do·not·pass·go,·do·not·collect·$200\n······return·fetchFail(er,·false)\n····}\n\n····const·fetchFail·=·(er:·unknown,·proceed:·boolean):·V·|·undefined·=>·{\n······const·{·aborted·}·=·ac.signal\n······const·allowStaleAborted·=·aborted·&&·options.allowStaleOnFetchAbort\n······const·allowStale·=\n········allowStaleAborted·||·options.allowStaleOnFetchRejection\n······const·noDelete·=·allowStale·||·options.noDeleteOnFetchRejection\n······const·bf·=·p·as·BackgroundFetch<V>\n······if·(this.#valList[index·as·Index]·===·p)·{\n········//·if·we·allow·stale·on·fetch·rejections,·then·we·need·to·ensure·that\n········//·the·stale·value·is·not·removed·from·the·cache·when·the·fetch·fails.\n········const·del·=\n··········!noDelete·||·(!proceed·&&·bf.__staleWhileFetching·===·undefined)\n········if·(del)·{\n··········this.#delete(k,·'fetch')\n········}·else·if·(!allowStaleAborted)·{\n··········//·still·replace·the·*promise*·with·the·stale·value,\n··········//·since·we·are·done·with·the·promise·at·this·point.\n··········//·leave·it·untouched·if·we're·still·waiting·for·an\n··········//·aborted·background·fetch·that·hasn't·yet·returned.\n··········this.#valList[index·as·Index]·=·bf.__staleWhileFetching\n········}\n······}\n······if·(allowStale)·{\n········if·(options.status·&&·bf.__staleWhileFetching·!==·undefined)·{\n··········options.status.returnedStale·=·true\n········}\n········return·bf.__staleWhileFetching\n······}·else·if·(bf.__returned·===·bf)·{\n········throw·er\n······}\n····}\n\n····const·pcall·=·(\n······res:·(v:·V·|·undefined)·=>·void,\n······rej:·(e:·unknown)·=>·void,\n····)·=>·{\n······const·fmp·=·this.#fetchMethod?.(k,·v,·fetchOpts)\n······if·(fmp·&&·fmp·instanceof·Promise)·{\n········fmp.then(v·=>·res(v·===·undefined·?·undefined·:·v),·rej)\n······}\n······//·ignored,·we·go·until·we·finish,·regardless.\n······//·defer·check·until·we·are·actually·aborting,\n······//·so·fetchMethod·can·override.\n······ac.signal.addEventListener('abort',·()·=>·{\n········if·(!options.ignoreFetchAbort·||·options.allowStaleOnFetchAbort)·{\n··········res(undefined)\n··········//·when·it·eventually·resolves,·update·the·cache.\n··········if·(options.allowStaleOnFetchAbort)·{\n············res·=·v·=>·cb(v,·true)\n··········}\n········}\n······})\n····}\n\n····if·(options.status)·options.status.fetchDispatched·=·true\n····const·p·=·new·Promise(pcall).then(cb,·eb)\n····const·bf:·BackgroundFetch<V>·=·Object.assign(p,·{\n······__abortController:·ac,\n······__staleWhileFetching:·v,\n······__returned:·undefined,\n····})\n\n····if·(index·===·undefined)·{\n······//·internal,·don't·expose·status.\n······this.#set(k,·bf,·{·...fetchOpts.options,·status:·undefined·})\n······index·=·this.#keyMap.get(k)\n····}·else·{\n······this.#valList[index]·=·bf\n····}\n····return·bf\n··}\n\n··#isBackgroundFetch(p:·unknown):·p·is·BackgroundFetch<V>·{\n····if·(!this.#hasFetchMethod)·return·false\n····const·b·=·p·as·BackgroundFetch<V>\n····return·(\n······!!b·&&\n······b·instanceof·Promise·&&\n······b.hasOwnProperty('__staleWhileFetching')·&&\n······b.__abortController·instanceof·AbortController\n····)\n··}\n\n··/**\n···*·Make·an·asynchronous·cached·fetch·using·the\n···*·{@link·LRUCache.OptionsBase.fetchMethod}·function.\n···*\n···*·If·the·value·is·in·the·cache·and·not·stale,·then·the·returned\n···*·Promise·resolves·to·the·value.\n···*\n···*·If·not·in·the·cache,·or·beyond·its·TTL·staleness,·then\n···*·`fetchMethod(key,·staleValue,·{·options,·signal,·context·})`·is\n···*·called,·and·the·value·returned·will·be·added·to·the·cache·once\n···*·resolved.\n···*\n···*·If·called·with·`allowStale`,·and·an·asynchronous·fetch·is\n···*·currently·in·progress·to·reload·a·stale·value,·then·the·former\n···*·stale·value·will·be·returned.\n···*\n···*·If·called·with·`forceRefresh`,·then·the·cached·item·will·be\n···*·re-fetched,·even·if·it·is·not·stale.·However,·if·`allowStale`·is·also\n···*·set,·then·the·old·value·will·still·be·returned.·This·is·useful\n···*·in·cases·where·you·want·to·force·a·reload·of·a·cached·value.·If\n···*·a·background·fetch·is·already·in·progress,·then·`forceRefresh`\n···*·has·no·effect.\n···*\n···*·If·multiple·fetches·for·the·same·key·are·issued,·then·they·will·all·be\n···*·coalesced·into·a·single·call·to·fetchMethod.\n···*\n···*·Note·that·this·means·that·handling·options·such·as\n···*·{@link·LRUCache.OptionsBase.allowStaleOnFetchAbort},\n···*·{@link·LRUCache.FetchOptions.signal},\n···*·and·{@link·LRUCache.OptionsBase.allowStaleOnFetchRejection}·will·be\n···*·determined·by·the·FIRST·fetch()·call·for·a·given·key.\n···*\n···*·This·is·a·known·(fixable)·shortcoming·which·will·be·addresed·on·when\n···*·someone·complains·about·it,·as·the·fix·would·involve·added·complexity·and\n···*·may·not·be·worth·the·costs·for·this·edge·case.\n···*\n···*·If·{@link·LRUCache.OptionsBase.fetchMethod}·is·not·specified,·then·this·is\n···*·effectively·an·alias·for·`Promise.resolve(cache.get(key))`.\n···*\n···*·When·the·fetch·method·resolves·to·a·value,·if·the·fetch·has·not\n···*·been·aborted·due·to·deletion,·eviction,·or·being·overwritten,\n···*·then·it·is·added·to·the·cache·using·the·options·provided.\n···*\n···*·If·the·key·is·evicted·or·deleted·before·the·`fetchMethod`\n···*·resolves,·then·the·AbortSignal·passed·to·the·`fetchMethod`·will\n···*·receive·an·`abort`·event,·and·the·promise·returned·by·`fetch()`\n···*·will·reject·with·the·reason·for·the·abort.\n···*\n···*·If·a·`signal`·is·passed·to·the·`fetch()`·call,·then·aborting·the\n···*·signal·will·abort·the·fetch·and·cause·the·`fetch()`·promise·to\n···*·reject·with·the·reason·provided.\n···*\n···*·**Setting·`context`**\n···*\n···*·If·an·`FC`·type·is·set·to·a·type·other·than·`unknown`,·`void`,·or\n···*·`undefined`·in·the·{@link·LRUCache}·constructor,·then·all\n···*·calls·to·`cache.fetch()`·_must_·provide·a·`context`·option.·If\n···*·set·to·`undefined`·or·`void`,·then·calls·to·fetch·_must·not_\n···*·provide·a·`context`·option.\n···*\n···*·The·`context`·param·allows·you·to·provide·arbitrary·data·that\n···*·might·be·relevant·in·the·course·of·fetching·the·data.·It·is·only\n···*·relevant·for·the·course·of·a·single·`fetch()`·operation,·and\n···*·discarded·afterwards.\n···*\n···*·**Note:·`fetch()`·calls·are·inflight-unique**\n···*\n···*·If·you·call·`fetch()`·multiple·times·with·the·same·key·value,\n···*·then·every·call·after·the·first·will·resolve·on·the·same\n···*·promise<sup>1</sup>,\n···*·_even·if·they·have·different·settings·that·would·otherwise·change\n···*·the·behavior·of·the·fetch_,·such·as·`noDeleteOnFetchRejection`\n···*·or·`ignoreFetchAbort`.\n···*\n···*·In·most·cases,·this·is·not·a·problem·(in·fact,·only·fetching\n···*·something·once·is·what·you·probably·want,·if·you're·caching·in\n···*·the·first·place).·If·you·are·changing·the·fetch()·options\n···*·dramatically·between·runs,·there's·a·good·chance·that·you·might\n···*·be·trying·to·fit·divergent·semantics·into·a·single·object,·and\n···*·would·be·better·off·with·multiple·cache·instances.\n···*\n···*·**1**:·Ie,·they're·not·the·\"same·Promise\",·but·they·resolve·at\n···*·the·same·time,·because·they're·both·waiting·on·the·same\n···*·underlying·fetchMethod·response.\n···*/\n\n··fetch(\n····k:·K,\n····fetchOptions:·unknown·extends·FC·?·LRUCache.FetchOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.FetchOptionsNoContext<K,·V>\n····:·LRUCache.FetchOptionsWithContext<K,·V,·FC>,\n··):·Promise<undefined·|·V>\n\n··//·this·overload·not·allowed·if·context·is·required\n··fetch(\n····k:·unknown·extends·FC·?·K\n····:·FC·extends·undefined·|·void·?·K\n····:·never,\n····fetchOptions?:·unknown·extends·FC·?·LRUCache.FetchOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.FetchOptionsNoContext<K,·V>\n····:·never,\n··):·Promise<undefined·|·V>\n··fetch(\n····k:·K,\n····fetchOptions:·LRUCache.FetchOptions<K,·V,·FC>·=·{},\n··):·Promise<undefined·|·V>·{\n····const·ths·=·tracing.hasSubscribers\n····const·{·status·=·hasSubscribers()·?·{}·:·undefined·}·=·fetchOptions\n····fetchOptions.status·=·status\n····if·(status·&&·fetchOptions.context)·{\n······status.context·=·fetchOptions.context\n····}\n····const·p·=·this.#fetch(k,·fetchOptions)\n····if·(status·&&·hasSubscribers())·{\n······if·(ths)·{\n········status.trace·=·true\n········tracing.tracePromise(()·=>·p,·status).catch(()·=>·{})\n······}\n····}\n····return·p\n··}\n\n··async·#fetch(\n····k:·K,\n····fetchOptions:·LRUCache.FetchOptions<K,·V,·FC>·=·{},\n··):·Promise<undefined·|·V>·{\n····const·{\n······//·get·options\n······allowStale·=·this.allowStale,\n······updateAgeOnGet·=·this.updateAgeOnGet,\n······noDeleteOnStaleGet·=·this.noDeleteOnStaleGet,\n······//·set·options\n······ttl·=·this.ttl,\n······noDisposeOnSet·=·this.noDisposeOnSet,\n······size·=·0,\n······sizeCalculation·=·this.sizeCalculation,\n······noUpdateTTL·=·this.noUpdateTTL,\n······//·fetch·exclusive·options\n······noDeleteOnFetchRejection·=·this.noDeleteOnFetchRejection,\n······allowStaleOnFetchRejection·=·this.allowStaleOnFetchRejection,\n······ignoreFetchAbort·=·this.ignoreFetchAbort,\n······allowStaleOnFetchAbort·=·this.allowStaleOnFetchAbort,\n······context,\n······forceRefresh·=·false,\n······status,\n······signal,\n····}·=·fetchOptions\n····if·(status)·{\n······status.op·=·'fetch'\n······status.key·=·k\n······if·(forceRefresh)·status.forceRefresh·=·true\n····}\n\n····if·(!this.#hasFetchMethod)·{\n······if·(status)·status.fetch·=·'get'\n······return·this.#get(k,·{\n········allowStale,\n········updateAgeOnGet,\n········noDeleteOnStaleGet,\n········status,\n······})\n····}\n\n····const·options·=·{\n······allowStale,\n······updateAgeOnGet,\n······noDeleteOnStaleGet,\n······ttl,\n······noDisposeOnSet,\n······size,\n······sizeCalculation,\n······noUpdateTTL,\n······noDeleteOnFetchRejection,\n······allowStaleOnFetchRejection,\n······allowStaleOnFetchAbort,\n······ignoreFetchAbort,\n······status,\n······signal,\n····}\n\n····let·index·=·this.#keyMap.get(k)\n····if·(index·===·undefined)·{\n······if·(status)·status.fetch·=·'miss'\n······const·p·=·this.#backgroundFetch(k,·index,·options,·context·as·FC)\n······return·(p.__returned·=·p)\n····}·else·{\n······//·in·cache,·maybe·already·fetching\n······const·v·=·this.#valList[index]\n······if·(this.#isBackgroundFetch(v))·{\n········const·stale·=·allowStale·&&·v.__staleWhileFetching·!==·undefined\n········if·(status)·{\n··········status.fetch·=·'inflight'\n··········if·(stale)·status.returnedStale·=·true\n········}\n········return·stale·?·v.__staleWhileFetching·:·(v.__returned·=·v)\n······}\n\n······//·if·we·force·a·refresh,·that·means·do·NOT·serve·the·cached·value,\n······//·unless·we·are·already·in·the·process·of·refreshing·the·cache.\n······const·isStale·=·this.#isStale(index)\n······if·(!forceRefresh·&&·!isStale)·{\n········if·(status)·status.fetch·=·'hit'\n········this.#moveToTail(index)\n········if·(updateAgeOnGet)·{\n··········this.#updateItemAge(index)\n········}\n········if·(status)·this.#statusTTL(status,·index)\n········return·v\n······}\n\n······//·ok,·it·is·stale·or·a·forced·refresh,·and·not·already·fetching.\n······//·refresh·the·cache.\n······const·p·=·this.#backgroundFetch(k,·index,·options,·context·as·FC)\n······const·hasStale·=·p.__staleWhileFetching·!==·undefined\n······const·staleVal·=·hasStale·&&·allowStale\n······if·(status)·{\n········status.fetch·=·isStale·?·'stale'·:·'refresh'\n········if·(staleVal·&&·isStale)·status.returnedStale·=·true\n······}\n······return·staleVal·?·p.__staleWhileFetching·:·(p.__returned·=·p)\n····}\n··}\n\n··/**\n···*·In·some·cases,·`cache.fetch()`·may·resolve·to·`undefined`,·either·because\n···*·a·{@link·LRUCache.OptionsBase#fetchMethod}·was·not·provided·(turning\n···*·`cache.fetch(k)`·into·just·an·async·wrapper·around·`cache.get(k)`)·or\n···*·because·`ignoreFetchAbort`·was·specified·(either·to·the·constructor·or\n···*·in·the·{@link·LRUCache.FetchOptions}).·Also,·the\n···*·{@link·LRUCache.OptionsBase.fetchMethod}·may·return·`undefined`·or·`void`,·making\n···*·the·test·even·more·complicated.\n···*\n···*·Because·inferring·the·cases·where·`undefined`·might·be·returned·are·so\n···*·cumbersome,·but·testing·for·`undefined`·can·also·be·annoying,·this·method\n···*·can·be·used,·which·will·reject·if·`this.fetch()`·resolves·to·undefined.\n···*/\n··forceFetch(\n····k:·K,\n····fetchOptions:·unknown·extends·FC·?·LRUCache.FetchOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.FetchOptionsNoContext<K,·V>\n····:·LRUCache.FetchOptionsWithContext<K,·V,·FC>,\n··):·Promise<V>\n··//·this·overload·not·allowed·if·context·is·required\n··forceFetch(\n····k:·unknown·extends·FC·?·K\n····:·FC·extends·undefined·|·void·?·K\n····:·never,\n····fetchOptions?:·unknown·extends·FC·?·LRUCache.FetchOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.FetchOptionsNoContext<K,·V>\n····:·never,\n··):·Promise<V>\n··forceFetch(\n····k:·K,\n····fetchOptions:·LRUCache.FetchOptions<K,·V,·FC>·=·{},\n··):·Promise<V>·{\n····const·ths·=·tracing.hasSubscribers\n····const·{·status·=·hasSubscribers()·?·{}·:·undefined·}·=·fetchOptions\n····fetchOptions.status·=·status\n····if·(status·&&·fetchOptions.context)·{\n······status.context·=·fetchOptions.context\n····}\n····const·p·=·this.#forceFetch(k,·fetchOptions)\n····if·(status·&&·hasSubscribers())·{\n······if·(ths)·{\n········status.trace·=·true\n········tracing.tracePromise(()·=>·p,·status).catch(()·=>·{})\n······}\n····}\n····return·p\n··}\n\n··async·#forceFetch(\n····k:·K,\n····fetchOptions:·LRUCache.FetchOptions<K,·V,·FC>·=·{},\n··)·{\n····const·v·=·await·this.#fetch(\n······k,\n······fetchOptions·as·unknown·extends·FC·?·LRUCache.FetchOptions<K,·V,·FC>\n······:·FC·extends·undefined·|·void·?·LRUCache.FetchOptionsNoContext<K,·V>\n······:·LRUCache.FetchOptionsWithContext<K,·V,·FC>,\n····)\n····if·(v·===·undefined)·throw·new·Error('fetch()·returned·undefined')\n····return·v\n··}\n\n··/**\n···*·If·the·key·is·found·in·the·cache,·then·this·is·equivalent·to\n···*·{@link·LRUCache#get}.·If·not,·in·the·cache,·then·calculate·the·value·using\n···*·the·{@link·LRUCache.OptionsBase.memoMethod},·and·add·it·to·the·cache.\n···*\n···*·If·an·`FC`·type·is·set·to·a·type·other·than·`unknown`,·`void`,·or\n···*·`undefined`·in·the·LRUCache·constructor,·then·all·calls·to·`cache.memo()`\n···*·_must_·provide·a·`context`·option.·If·set·to·`undefined`·or·`void`,·then\n···*·calls·to·memo·_must·not_·provide·a·`context`·option.\n···*\n···*·The·`context`·param·allows·you·to·provide·arbitrary·data·that·might·be\n···*·relevant·in·the·course·of·fetching·the·data.·It·is·only·relevant·for·the\n···*·course·of·a·single·`memo()`·operation,·and·discarded·afterwards.\n···*/\n··memo(\n····k:·K,\n····memoOptions:·unknown·extends·FC·?·LRUCache.MemoOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.MemoOptionsNoContext<K,·V>\n····:·LRUCache.MemoOptionsWithContext<K,·V,·FC>,\n··):·V\n··//·this·overload·not·allowed·if·context·is·required\n··memo(\n····k:·unknown·extends·FC·?·K\n····:·FC·extends·undefined·|·void·?·K\n····:·never,\n····memoOptions?:·unknown·extends·FC·?·LRUCache.MemoOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.MemoOptionsNoContext<K,·V>\n····:·never,\n··):·V\n··memo(k:·K,·memoOptions:·LRUCache.MemoOptions<K,·V,·FC>·=·{})·{\n····const·{·status·=·metrics.hasSubscribers·?·{}·:·undefined·}·=\n······memoOptions\n····memoOptions.status·=·status\n····if·(status)·{\n······status.op·=·'memo'\n······status.key·=·k\n······if·(memoOptions.context)·{\n········status.context·=·memoOptions.context\n······}\n····}\n····const·result·=·this.#memo(k,·memoOptions)\n····if·(status)·status.value·=·result\n····if·(metrics.hasSubscribers)·metrics.publish(status)\n····return·result\n··}\n··#memo(k:·K,·memoOptions:·LRUCache.MemoOptions<K,·V,·FC>·=·{})·{\n····const·memoMethod·=·this.#memoMethod\n····if·(!memoMethod)·{\n······throw·new·Error('no·memoMethod·provided·to·constructor')\n····}\n····const·{·context,·status,·forceRefresh,·...options·}·=·memoOptions\n····if·(status·&&·forceRefresh)·status.forceRefresh·=·true\n····const·v·=·this.#get(k,·options)\n····const·refresh·=·forceRefresh·||·v·===·undefined\n····if·(status)·{\n······status.memo·=·refresh·?·'miss'·:·'hit'\n······if·(!refresh)·status.value·=·v\n····}\n····if·(!refresh)·return·v\n····const·vv·=·memoMethod(k,·v,·{\n······options,\n······context,\n····}·as·LRUCache.MemoizerOptions<K,·V,·FC>)\n····if·(status)·status.value·=·vv\n····this.#set(k,·vv,·options)\n····return·vv\n··}\n\n··/**\n···*·Return·a·value·from·the·cache.·Will·update·the·recency·of·the·cache\n···*·entry·found.\n···*\n···*·If·the·key·is·not·found,·get()·will·return·`undefined`.\n···*/\n··get(k:·K,·getOptions:·LRUCache.GetOptions<K,·V,·FC>·=·{})·{\n····const·{·status·=·metrics.hasSubscribers·?·{}·:·undefined·}·=·getOptions\n····getOptions.status·=·status\n····if·(status)·{\n······status.op·=·'get'\n······status.key·=·k\n····}\n····const·result·=·this.#get(k,·getOptions)\n····if·(status)·{\n······if·(result·!==·undefined)·status.value·=·result\n······if·(metrics.hasSubscribers)·metrics.publish(status)\n····}\n····return·result\n··}\n\n··#get(k:·K,·getOptions:·LRUCache.GetOptions<K,·V,·FC>·=·{})·{\n····const·{\n······allowStale·=·this.allowStale,\n······updateAgeOnGet·=·this.updateAgeOnGet,\n······noDeleteOnStaleGet·=·this.noDeleteOnStaleGet,\n······status,\n····}·=·getOptions\n····const·index·=·this.#keyMap.get(k)\n····if·(index·===·undefined)·{\n······if·(status)·status.get·=·'miss'\n······return·undefined\n····}\n····const·value·=·this.#valList[index]\n····const·fetching·=·this.#isBackgroundFetch(value)\n····if·(status)·this.#statusTTL(status,·index)\n····if·(this.#isStale(index))·{\n······//·delete·only·if·not·an·in-flight·background·fetch\n······if·(!fetching)·{\n········if·(!noDeleteOnStaleGet)·{\n··········this.#delete(k,·'expire')\n········}\n········if·(status)·status.get·=·'stale'\n········if·(allowStale)·{\n··········if·(status)·status.returnedStale·=·true\n··········return·value\n········}\n········return·undefined\n······}\n······if·(status)·status.get·=·'stale-fetching'\n······if·(allowStale·&&·value.__staleWhileFetching·!==·undefined)·{\n········if·(status)·status.returnedStale·=·true\n········return·value.__staleWhileFetching\n······}\n······return·undefined\n····}\n····//·not·stale\n····if·(status)·status.get·=·fetching·?·'fetching'·:·'hit'\n····//·if·we're·currently·fetching·it,·we·don't·actually·have·it·yet\n····//·it's·not·stale,·which·means·this·isn't·a·staleWhileRefetching.\n····//·If·it's·not·stale,·and·fetching,·AND·has·a·__staleWhileFetching\n····//·value,·then·that·means·the·user·fetched·with·{forceRefresh:true},\n····//·so·it's·safe·to·return·that·value.\n····this.#moveToTail(index)\n····if·(updateAgeOnGet)·{\n······this.#updateItemAge(index)\n····}\n····return·fetching·?·value.__staleWhileFetching·:·value\n··}\n\n··#connect(p:·Index,·n:·Index)·{\n····this.#prev[n]·=·p\n····this.#next[p]·=·n\n··}\n\n··#moveToTail(index:·Index):·void·{\n····//·if·tail·already,·nothing·to·do\n····//·if·head,·move·head·to·next[index]\n····//·else\n····//···move·next[prev[index]]·to·next[index]·(head·has·no·prev)\n····//···move·prev[next[index]]·to·prev[index]\n····//·prev[index]·=·tail\n····//·next[tail]·=·index\n····//·tail·=·index\n····if·(index·!==·this.#tail)·{\n······if·(index·===·this.#head)·{\n········this.#head·=·this.#next[index]·as·Index\n······}·else·{\n········this.#connect(\n··········this.#prev[index]·as·Index,\n··········this.#next[index]·as·Index,\n········)\n······}\n······this.#connect(this.#tail,·index)\n······this.#tail·=·index\n····}\n··}\n\n··/**\n···*·Deletes·a·key·out·of·the·cache.\n···*\n···*·Returns·true·if·the·key·was·deleted,·false·otherwise.\n···*/\n··delete(k:·K)·{\n····return·this.#delete(k,·'delete')\n··}\n\n··#delete(k:·K,·reason:·LRUCache.DisposeReason)·{\n····if·(metrics.hasSubscribers)·{\n······metrics.publish({\n········op:·'delete',\n········delete:·reason,\n········key:·k,\n······})\n····}\n····let·deleted·=·false\n····if·(this.#size·!==·0)·{\n······const·index·=·this.#keyMap.get(k)\n······if·(index·!==·undefined)·{\n········if·(this.#autopurgeTimers?.[index])·{\n··········clearTimeout(this.#autopurgeTimers?.[index])\n··········this.#autopurgeTimers[index]·=·undefined\n········}\n········deleted·=·true\n········if·(this.#size·===·1)·{\n··········this.#clear(reason)\n········}·else·{\n··········this.#removeItemSize(index)\n··········const·v·=·this.#valList[index]\n··········if·(this.#isBackgroundFetch(v))·{\n············v.__abortController.abort(new·Error('deleted'))\n··········}·else·if·(this.#hasDispose·||·this.#hasDisposeAfter)·{\n············if·(this.#hasDispose)·{\n··············this.#dispose?.(v·as·V,·k,·reason)\n············}\n············if·(this.#hasDisposeAfter)·{\n··············this.#disposed?.push([v·as·V,·k,·reason])\n············}\n··········}\n··········this.#keyMap.delete(k)\n··········this.#keyList[index]·=·undefined\n··········this.#valList[index]·=·undefined\n··········if·(index·===·this.#tail)·{\n············this.#tail·=·this.#prev[index]·as·Index\n··········}·else·if·(index·===·this.#head)·{\n············this.#head·=·this.#next[index]·as·Index\n··········}·else·{\n············const·pi·=·this.#prev[index]·as·number\n············this.#next[pi]·=·this.#next[index]·as·number\n············const·ni·=·this.#next[index]·as·number\n············this.#prev[ni]·=·this.#prev[index]·as·number\n··········}\n··········this.#size--\n··········this.#free.push(index)\n········}\n······}\n····}\n····if·(this.#hasDisposeAfter·&&·this.#disposed?.length)·{\n······const·dt·=·this.#disposed\n······let·task:·DisposeTask<K,·V>·|·undefined\n······while·((task·=·dt?.shift()))·{\n········this.#disposeAfter?.(...task)\n······}\n····}\n····return·deleted\n··}\n\n··/**\n···*·Clear·the·cache·entirely,·throwing·away·all·values.\n···*/\n··clear()·{\n····return·this.#clear('delete')\n··}\n··#clear(reason:·LRUCache.DisposeReason)·{\n····for·(const·index·of·this.#rindexes({·allowStale:·true·}))·{\n······const·v·=·this.#valList[index]\n······if·(this.#isBackgroundFetch(v))·{\n········v.__abortController.abort(new·Error('deleted'))\n······}·else·{\n········const·k·=·this.#keyList[index]\n········if·(this.#hasDispose)·{\n··········this.#dispose?.(v·as·V,·k·as·K,·reason)\n········}\n········if·(this.#hasDisposeAfter)·{\n··········this.#disposed?.push([v·as·V,·k·as·K,·reason])\n········}\n······}\n····}\n\n····this.#keyMap.clear()\n····this.#valList.fill(undefined)\n····this.#keyList.fill(undefined)\n····if·(this.#ttls·&&·this.#starts)·{\n······this.#ttls.fill(0)\n······this.#starts.fill(0)\n······for·(const·t·of·this.#autopurgeTimers·??·[])·{\n········if·(t·!==·undefined)·clearTimeout(t)\n······}\n······this.#autopurgeTimers?.fill(undefined)\n····}\n····if·(this.#sizes)·{\n······this.#sizes.fill(0)\n····}\n····this.#head·=·0·as·Index\n····this.#tail·=·0·as·Index\n····this.#free.length·=·0\n····this.#calculatedSize·=·0\n····this.#size·=·0\n····if·(this.#hasDisposeAfter·&&·this.#disposed)·{\n······const·dt·=·this.#disposed\n······let·task:·DisposeTask<K,·V>·|·undefined\n······while·((task·=·dt?.shift()))·{\n········this.#disposeAfter?.(...task)\n······}\n····}\n··}\n}\n" | 193 | ········"/**\n·*·@module·LRUCache\n·*/\n\nimport·{·metrics,·tracing·}·from·'./diagnostics-channel.js'\n\nconst·hasSubscribers·=·()·=>\n··metrics.hasSubscribers·||·tracing.hasSubscribers\n\n//·module-private·names·and·types\n//·this·provides·the·default·Perf·object·source.\n//·it·can·be·passed·in·via·configuration·to·override·it\n//·for·a·single·LRU·object.\nexport·type·Perf·=·{·now:·()·=>·number·}\nconst·defaultPerf:·Perf·=\n··(\n····typeof·performance·===·'object'·&&\n····performance·&&\n····typeof·performance.now·===·'function'\n··)·?\n····performance\n··:·Date\n\nconst·warned·=·new·Set<string>()\n\n//·either·a·function·or·a·class\n//·oxlint-disable-next-line·no-explicit-any\ntype·ForC·=·((...a:·any[])·=>·any)·|·{·new·(...a:·any[]):·any·}\n\n/*·c8·ignore·start·*/\nconst·PROCESS·=·(\n··typeof·process·===·'object'·&&·!!process·?\n····process\n··:·{})·as·{·[k:·string]:·unknown·}\n/*·c8·ignore·stop·*/\n\nconst·emitWarning·=·(\n··msg:·string,\n··type:·string,\n··code:·string,\n··fn:·ForC,\n)·=>·{\n··if·(typeof·PROCESS.emitWarning·===·'function')·{\n····PROCESS.emitWarning(msg,·type,·code,·fn)\n··}·else·{\n····//oxlint-disable-next-line·no-console\n····console.error(`[${code}]·${type}:·${msg}`)\n··}\n}\nconst·shouldWarn·=·(code:·string)·=>·!warned.has(code)\n\nconst·TYPE·=·Symbol('type')\nexport·type·PosInt·=·number·&·{·[TYPE]:·'Positive·Integer'·}\nexport·type·Index·=·number·&·{·[TYPE]:·'LRUCache·Index'·}\n\nconst·isPosInt·=·(n:·unknown):·n·is·PosInt·=>\n··!!n·&&·n·===·Math.floor(n·as·number)·&&·n·>·0·&&·isFinite(n)\n\nexport·type·UintArray·=·Uint8Array·|·Uint16Array·|·Uint32Array\nexport·type·NumberArray·=·UintArray·|·number[]\n\n//·This·is·a·little·bit·ridiculous,·tbh.\n//·The·maximum·array·length·is·2^32-1·or·thereabouts·on·most·JS·impls.\n//·And·well·before·that·point,·you're·caching·the·entire·world,·I·mean,\n//·that's·~32GB·of·just·integers·for·the·next/prev·links,·plus·whatever\n//·else·to·hold·that·many·keys·and·values.··Just·filling·the·memory·with\n//·zeroes·at·init·time·is·brutal·when·you·get·that·big.\n//·But·why·not·be·complete?\n//·Maybe·in·the·future,·these·limits·will·have·expanded.\n/*·c8·ignore·start·*/\nconst·getUintArray·=·(max:·number)·=>\n··!isPosInt(max)·?·null\n··:·max·<=·Math.pow(2,·8)·?·Uint8Array\n··:·max·<=·Math.pow(2,·16)·?·Uint16Array\n··:·max·<=·Math.pow(2,·32)·?·Uint32Array\n··:·max·<=·Number.MAX_SAFE_INTEGER·?·ZeroArray\n··:·null\n/*·c8·ignore·stop·*/\n\nclass·ZeroArray·extends·Array<number>·{\n··constructor(size:·number)·{\n····super(size)\n····this.fill(0)\n··}\n}\nexport·type·{·ZeroArray·}\nexport·type·{·Stack·}\n\nexport·type·StackLike·=·Stack·|·Index[]\nclass·Stack·{\n··heap:·NumberArray\n··length:·number\n··//·private·constructor\n··static·#constructing:·boolean·=·false\n··static·create(max:·number):·StackLike·{\n····const·HeapCls·=·getUintArray(max)\n····if·(!HeapCls)·return·[]\n····Stack.#constructing·=·true\n····const·s·=·new·Stack(max,·HeapCls)\n····Stack.#constructing·=·false\n····return·s\n··}\n··constructor(max:·number,·HeapCls:·{·new·(n:·number):·NumberArray·})·{\n····/*·c8·ignore·start·*/\n····if·(!Stack.#constructing)·{\n······throw·new·TypeError('instantiate·Stack·using·Stack.create(n)')\n····}\n····/*·c8·ignore·stop·*/\n····this.heap·=·new·HeapCls(max)\n····this.length·=·0\n··}\n··push(n:·Index)·{\n····this.heap[this.length++]·=·n\n··}\n··pop():·Index·{\n····return·this.heap[--this.length]·as·Index\n··}\n}\n\n/**\n·*·Promise·representing·an·in-progress·{@link·LRUCache#fetch}·call\n·*/\nexport·type·BackgroundFetch<V>·=·Promise<V·|·undefined>·&·{\n··__returned:·BackgroundFetch<V>·|·undefined\n··__abortController:·AbortController\n··__staleWhileFetching:·V·|·undefined\n}\n\nexport·type·DisposeTask<K,·V>·=·[\n··value:·V,\n··key:·K,\n··reason:·LRUCache.DisposeReason,\n]\n\nexport·namespace·LRUCache·{\n··/**\n···*·An·integer·greater·than·0,·reflecting·the·calculated·size·of·items\n···*/\n··export·type·Size·=·number\n\n··/**\n···*·Integer·greater·than·0,·representing·some·number·of·milliseconds,·or·the\n···*·time·at·which·a·TTL·started·counting·from.\n···*/\n··export·type·Milliseconds·=·number\n\n··/**\n···*·An·integer·greater·than·0,·reflecting·a·number·of·items\n···*/\n··export·type·Count·=·number\n\n··/**\n···*·The·reason·why·an·item·was·removed·from·the·cache,·passed\n···*·to·the·{@link·Disposer}·methods.\n···*\n···*·-·`evict`:·The·item·was·evicted·because·it·is·the·least·recently·used,\n···*···and·the·cache·is·full.\n···*·-·`set`:·A·new·value·was·set,·overwriting·the·old·value·being·disposed.\n···*·-·`delete`:·The·item·was·explicitly·deleted,·either·by·calling\n···*···{@link·LRUCache#delete},·{@link·LRUCache#clear},·or\n···*···{@link·LRUCache#set}·with·an·undefined·value.\n···*·-·`expire`:·The·item·was·removed·due·to·exceeding·its·TTL.\n···*·-·`fetch`:·A·{@link·OptionsBase#fetchMethod}·operation·returned\n···*···`undefined`·or·was·aborted,·causing·the·item·to·be·deleted.\n···*/\n··export·type·DisposeReason·=\n····|·'evict'\n····|·'set'\n····|·'delete'\n····|·'expire'\n····|·'fetch'\n··/**\n···*·A·method·called·upon·item·removal,·passed·as·the\n···*·{@link·OptionsBase.dispose}·and/or\n···*·{@link·OptionsBase.disposeAfter}·options.\n···*/\n··export·type·Disposer<K,·V>·=·(\n····value:·V,\n····key:·K,\n····reason:·DisposeReason,\n··)·=>·void\n\n··/**\n···*·The·reason·why·an·item·was·added·to·the·cache,·passed\n···*·to·the·{@link·Inserter}·methods.\n···*\n···*·-·`add`:·the·item·was·not·found·in·the·cache,·and·was·added\n···*·-·`update`:·the·item·was·in·the·cache,·with·the·same·value·provided\n···*·-·`replace`:·the·item·was·in·the·cache,·and·replaced\n···*/\n··export·type·InsertReason·=·'add'·|·'update'·|·'replace'\n\n··/**\n···*·A·method·called·upon·item·insertion,·passed·as·the\n···*·{@link·OptionsBase.insert}\n···*/\n··export·type·Inserter<K,·V>·=·(\n····value:·V,\n····key:·K,\n····reason:·InsertReason,\n··)·=>·void\n\n··/**\n···*·A·function·that·returns·the·effective·calculated·size\n···*·of·an·entry·in·the·cache.\n···*/\n··export·type·SizeCalculator<K,·V>·=·(value:·V,·key:·K)·=>·Size\n\n··/**\n···*·Options·provided·to·the\n···*·{@link·OptionsBase.fetchMethod}·function.\n···*/\n··export·interface·FetcherOptions<K,·V,·FC·=·unknown>·{\n····signal:·AbortSignal\n····options:·FetcherFetchOptions<K,·V,·FC>\n····/**\n·····*·Object·provided·in·the·{@link·FetchOptions.context}·option·to\n·····*·{@link·LRUCache#fetch}\n·····*/\n····context:·FC\n··}\n\n··/**\n···*·Occasionally,·it·may·be·useful·to·track·the·internal·behavior·of·the\n···*·cache,·particularly·for·logging,·debugging,·or·for·behavior·within·the\n···*·`fetchMethod`.·To·do·this,·you·can·pass·a·`status`·object·to·the\n···*·{@link·LRUCache#fetch},·{@link·LRUCache#get},·{@link·LRUCache#set},\n···*·{@link·LRUCache#memo},·and·{@link·LRUCache#has}·methods.\n···*\n···*·The·`status`·option·should·be·a·plain·JavaScript·object.·The·following\n···*·fields·will·be·set·on·it·appropriately,·depending·on·the·situation.\n···*\n···*·These·objects·are·also·the·context·objects·passed·to·listeners·on·the\n···*·`lru-cache:metrics`·diagnostic·channel,·and·the·`lru-cache`·tracing\n···*·channels,·in·platforms·that·support·them.\n···*/\n··export·interface·Status<K,·V>·{\n····/**\n·····*·The·operation·being·performed\n·····*/\n····op?:·'get'·|·'set'·|·'memo'·|·'fetch'·|·'delete'·|·'has'·|·'peek'\n····/**\n·····*·The·status·of·a·set()·operation.\n·····*\n·····*·-·add:·the·item·was·not·found·in·the·cache,·and·was·added\n·····*·-·update:·the·item·was·in·the·cache,·with·the·same·value·provided\n·····*·-·replace:·the·item·was·in·the·cache,·and·replaced\n·····*·-·miss:·the·item·was·not·added·to·the·cache·for·some·reason\n·····*/\n····set?:·'add'·|·'update'·|·'replace'·|·'miss'·|·'deleted'\n\n····/**\n·····*·The·status·of·a·delete()·operation.\n·····*/\n····delete?:·LRUCache.DisposeReason\n\n····/**\n·····*·The·result·of·a·peek()·operation\n·····*\n·····*·-·hit:·the·item·was·found·and·returned\n·····*·-·stale:·the·item·is·in·the·cache,·but·past·its·ttl·and·not·returned\n·····*·-·miss:·item·not·in·the·cache\n·····*/\n····peek?:·'hit'·|·'miss'·|·'stale'\n\n····/**\n·····*·The·status·of·a·memo()·operation.\n·····*\n·····*·-·'hit':·the·item·was·found·in·the·cache·and·returned\n·····*·-·'miss':·the·`memoMethod`·function·was·called\n·····*/\n····memo?:·'hit'·|·'miss'\n\n····/**\n·····*·The·`context`·option·provided·to·a·memo·or·fetch·operation\n·····*\n·····*·In·practice,·of·course,·this·will·be·the·same·type·as·the·`FC`\n·····*·fetch·context·param·used·to·instantiate·the·LRUCache,·but·the\n·····*·convolutions·of·threading·that·through·would·get·quite·complicated,\n·····*·and·preclude·forcing/forbidding·the·passing·of·a·`context`·param\n·····*·where·it·is/isn't·expected,·which·is·more·valuable·for·error\n·····*·prevention.\n·····*/\n····context?:·unknown\n\n····/**\n·····*·the·ttl·stored·for·the·item,·or·undefined·if·ttls·are·not·used.\n·····*/\n····ttl?:·Milliseconds\n\n····/**\n·····*·the·start·time·for·the·item,·or·undefined·if·ttls·are·not·used.\n·····*/\n····start?:·Milliseconds\n\n····/**\n·····*·The·timestamp·used·for·TTL·calculation\n·····*/\n····now?:·Milliseconds\n\n····/**\n·····*·the·remaining·ttl·for·the·item,·or·undefined·if·ttls·are·not·used.\n·····*/\n····remainingTTL?:·Milliseconds\n\n····/**\n·····*·The·calculated·size·for·the·item,·if·sizes·are·used.\n·····*/\n····entrySize?:·Size\n\n····/**\n·····*·The·total·calculated·size·of·the·cache,·if·sizes·are·used.\n·····*/\n····totalCalculatedSize?:·Size\n\n····/**\n·····*·A·flag·indicating·that·the·item·was·not·stored,·due·to·exceeding·the\n·····*·{@link·OptionsBase.maxEntrySize}\n·····*/\n····maxEntrySizeExceeded?:·true\n\n····/**\n·····*·The·key·that·was·set·or·retrieved\n·····*/\n····key?:·K\n\n····/**\n·····*·The·value·that·was·set\n·····*/\n····value?:·V\n\n····/**\n·····*·The·old·value,·specified·in·the·case·of·`set:'replace'`\n·····*/\n····oldValue?:·V\n\n····/**\n·····*·The·results·of·a·{@link·LRUCache#has}·operation\n·····*\n·····*·-·hit:·the·item·was·found·in·the·cache\n·····*·-·stale:·the·item·was·found·in·the·cache,·but·is·stale\n·····*·-·miss:·the·item·was·not·found·in·the·cache\n·····*/\n····has?:·'hit'·|·'stale'·|·'miss'\n\n····/**\n·····*·The·status·of·a·{@link·LRUCache#fetch}·operation.\n·····*·Note·that·this·can·change·as·the·underlying·fetch()·moves·through\n·····*·various·states.\n·····*\n·····*·-·inflight:·there·is·another·fetch()·for·this·key·which·is·in·process\n·····*·-·get:·there·is·no·{@link·OptionsBase.fetchMethod},·so\n·····*···{@link·LRUCache#get}·was·called.\n·····*·-·miss:·the·item·is·not·in·cache,·and·will·be·fetched.\n·····*·-·hit:·the·item·is·in·the·cache,·and·was·resolved·immediately.\n·····*·-·stale:·the·item·is·in·the·cache,·but·stale.\n·····*·-·refresh:·the·item·is·in·the·cache,·and·not·stale,·but\n·····*···{@link·FetchOptions.forceRefresh}·was·specified.\n·····*/\n····fetch?:·'get'·|·'inflight'·|·'miss'·|·'hit'·|·'stale'·|·'refresh'\n\n····/**\n·····*·`forceRefresh`·option·was·used·for·either·a·fetch·or·memo·operation\n·····*/\n····forceRefresh?:·boolean\n\n····/**\n·····*·The·{@link·OptionsBase.fetchMethod}·was·called\n·····*/\n····fetchDispatched?:·true\n\n····/**\n·····*·The·cached·value·was·updated·after·a·successful·call·to\n·····*·{@link·OptionsBase.fetchMethod}\n·····*/\n····fetchUpdated?:·true\n\n····/**\n·····*·The·reason·for·a·fetch()·rejection.··Either·the·error·raised·by·the\n·····*·{@link·OptionsBase.fetchMethod},·or·the·reason·for·an\n·····*·AbortSignal.\n·····*/\n····fetchError?:·Error\n\n····/**\n·····*·The·fetch·received·an·abort·signal\n·····*/\n····fetchAborted?:·true\n\n····/**\n·····*·The·abort·signal·received·was·ignored,·and·the·fetch·was·allowed·to\n·····*·continue·in·the·background.\n·····*/\n····fetchAbortIgnored?:·true\n\n····/**\n·····*·The·fetchMethod·promise·resolved·successfully\n·····*/\n····fetchResolved?:·true\n\n····/**\n·····*·The·fetchMethod·promise·was·rejected\n·····*/\n····fetchRejected?:·true\n\n····/**\n·····*·The·status·of·a·{@link·LRUCache#get}·operation.\n·····*\n·····*·-·fetching:·The·item·is·currently·being·fetched.··If·a·previous·value\n·····*···is·present·and·allowed,·that·will·be·returned.\n·····*·-·stale:·The·item·is·in·the·cache,·and·is·stale.·If·it·was·returned,\n·····*···then·the·`returnedStale`·flag·will·be·set.\n·····*·-·stale-fetching:·The·value·is·being·fetched·in·the·background,·but·is\n·····*···currently·stale.·If·the·stale·value·was·returned,·then·the\n·····*···`returnedStale`·flag·will·be·set.\n·····*·-·hit:·the·item·is·in·the·cache\n·····*·-·miss:·the·item·is·not·in·the·cache\n·····*/\n····get?:·'stale'·|·'hit'·|·'miss'·|·'fetching'·|·'stale-fetching'\n\n····/**\n·····*·A·fetch·or·get·operation·returned·a·stale·value.\n·····*/\n····returnedStale?:·true\n\n····/**\n·····*·A·tracingChannel·trace·was·started·for·this·operation\n·····*/\n····trace?:·boolean\n··}\n\n··/**\n···*·options·which·override·the·options·set·in·the·LRUCache·constructor\n···*·when·calling·{@link·LRUCache#fetch}.\n···*\n···*·This·is·the·union·of·{@link·GetOptions}·and·{@link·SetOptions},·plus\n···*·{@link·OptionsBase.noDeleteOnFetchRejection},\n···*·{@link·OptionsBase.allowStaleOnFetchRejection},\n···*·{@link·FetchOptions.forceRefresh},·and\n···*·{@link·FetcherOptions.context}\n···*\n···*·Any·of·these·may·be·modified·in·the·{@link·OptionsBase.fetchMethod}\n···*·function,·but·the·{@link·GetOptions}·fields·will·of·course·have·no\n···*·effect,·as·the·{@link·LRUCache#get}·call·already·happened·by·the·time\n···*·the·fetchMethod·is·called.\n···*/\n··export·interface·FetcherFetchOptions<K,·V,·FC·=·unknown>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····|·'allowStale'\n····|·'updateAgeOnGet'\n····|·'noDeleteOnStaleGet'\n····|·'sizeCalculation'\n····|·'ttl'\n····|·'noDisposeOnSet'\n····|·'noUpdateTTL'\n····|·'noDeleteOnFetchRejection'\n····|·'allowStaleOnFetchRejection'\n····|·'ignoreFetchAbort'\n····|·'allowStaleOnFetchAbort'\n··>·{\n····status?:·Status<K,·V>\n····size?:·Size\n··}\n\n··/**\n···*·Options·that·may·be·passed·to·the·{@link·LRUCache#fetch}·method.\n···*/\n··export·interface·FetchOptions<K,·V,·FC>·extends·FetcherFetchOptions<\n····K,\n····V,\n····FC\n··>·{\n····/**\n·····*·Set·to·true·to·force·a·re-load·of·the·existing·data,·even·if·it\n·····*·is·not·yet·stale.\n·····*/\n····forceRefresh?:·boolean\n····/**\n·····*·Context·provided·to·the·{@link·OptionsBase.fetchMethod}·as\n·····*·the·{@link·FetcherOptions.context}·param.\n·····*\n·····*·If·the·FC·type·is·specified·as·unknown·(the·default),\n·····*·undefined·or·void,·then·this·is·optional.··Otherwise,·it·will\n·····*·be·required.\n·····*/\n····context?:·FC\n····signal?:·AbortSignal\n····status?:·Status<K,·V>\n··}\n··/**\n···*·Options·provided·to·{@link·LRUCache#fetch}·when·the·FC·type·is·something\n···*·other·than·`unknown`,·`undefined`,·or·`void`\n···*/\n··export·interface·FetchOptionsWithContext<K,·V,·FC>·extends·FetchOptions<\n····K,\n····V,\n····FC\n··>·{\n····context:·FC\n··}\n··/**\n···*·Options·provided·to·{@link·LRUCache#fetch}·when·the·FC·type·is\n···*·`undefined`·or·`void`\n···*/\n··export·interface·FetchOptionsNoContext<K,·V>·extends·FetchOptions<\n····K,\n····V,\n····undefined\n··>·{\n····context?:·undefined\n··}\n\n··export·interface·MemoOptions<K,·V,·FC·=·unknown>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····|·'allowStale'\n····|·'updateAgeOnGet'\n····|·'noDeleteOnStaleGet'\n····|·'sizeCalculation'\n····|·'ttl'\n····|·'noDisposeOnSet'\n····|·'noUpdateTTL'\n····|·'noDeleteOnFetchRejection'\n····|·'allowStaleOnFetchRejection'\n····|·'ignoreFetchAbort'\n····|·'allowStaleOnFetchAbort'\n··>·{\n····/**\n·····*·Set·to·true·to·force·a·re-load·of·the·existing·data,·even·if·it\n·····*·is·not·yet·stale.\n·····*/\n····forceRefresh?:·boolean\n····/**\n·····*·Context·provided·to·the·{@link·OptionsBase.memoMethod}·as\n·····*·the·{@link·MemoizerOptions.context}·param.\n·····*\n·····*·If·the·FC·type·is·specified·as·unknown·(the·default),\n·····*·undefined·or·void,·then·this·is·optional.··Otherwise,·it·will\n·····*·be·required.\n·····*/\n····context?:·FC\n····status?:·Status<K,·V>\n··}\n··/**\n···*·Options·provided·to·{@link·LRUCache#memo}·when·the·FC·type·is·something\n···*·other·than·`unknown`,·`undefined`,·or·`void`\n···*/\n··export·interface·MemoOptionsWithContext<K,·V,·FC>·extends·MemoOptions<\n····K,\n····V,\n····FC\n··>·{\n····context:·FC\n··}\n··/**\n···*·Options·provided·to·{@link·LRUCache#memo}·when·the·FC·type·is\n···*·`undefined`·or·`void`\n···*/\n··export·interface·MemoOptionsNoContext<K,·V>·extends·MemoOptions<\n····K,\n····V,\n····undefined\n··>·{\n····context?:·undefined\n··}\n\n··/**\n···*·Options·provided·to·the\n···*·{@link·OptionsBase.memoMethod}·function.\n···*/\n··export·interface·MemoizerOptions<K,·V,·FC·=·unknown>·{\n····options:·MemoizerMemoOptions<K,·V,·FC>\n····/**\n·····*·Object·provided·in·the·{@link·MemoOptions.context}·option·to\n·····*·{@link·LRUCache#memo}\n·····*/\n····context:·FC\n··}\n\n··/**\n···*·options·which·override·the·options·set·in·the·LRUCache·constructor\n···*·when·calling·{@link·LRUCache#memo}.\n···*\n···*·This·is·the·union·of·{@link·GetOptions}·and·{@link·SetOptions},·plus\n···*·{@link·MemoOptions.forceRefresh},·and\n···*·{@link·MemoOptions.context}\n···*\n···*·Any·of·these·may·be·modified·in·the·{@link·OptionsBase.memoMethod}\n···*·function,·but·the·{@link·GetOptions}·fields·will·of·course·have·no\n···*·effect,·as·the·{@link·LRUCache#get}·call·already·happened·by·the·time\n···*·the·memoMethod·is·called.\n···*/\n··export·interface·MemoizerMemoOptions<K,·V,·FC·=·unknown>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····|·'allowStale'\n····|·'updateAgeOnGet'\n····|·'noDeleteOnStaleGet'\n····|·'sizeCalculation'\n····|·'ttl'\n····|·'noDisposeOnSet'\n····|·'noUpdateTTL'\n··>·{\n····status?:·Status<K,·V>\n····size?:·Size\n····start?:·Milliseconds\n··}\n\n··/**\n···*·Options·that·may·be·passed·to·the·{@link·LRUCache#has}·method.\n···*/\n··export·interface·HasOptions<K,·V,·FC>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····'updateAgeOnHas'\n··>·{\n····status?:·Status<K,·V>\n··}\n\n··/**\n···*·Options·that·may·be·passed·to·the·{@link·LRUCache#get}·method.\n···*/\n··export·interface·GetOptions<K,·V,·FC>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····'allowStale'·|·'updateAgeOnGet'·|·'noDeleteOnStaleGet'\n··>·{\n····status?:·Status<K,·V>\n··}\n\n··/**\n···*·Options·that·may·be·passed·to·the·{@link·LRUCache#peek}·method.\n···*/\n··export·interface·PeekOptions<K,·V,·FC>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····'allowStale'\n··>·{\n····status?:·Status<K,·V>\n··}\n\n··/**\n···*·Options·that·may·be·passed·to·the·{@link·LRUCache#set}·method.\n···*/\n··export·interface·SetOptions<K,·V,·FC>·extends·Pick<\n····OptionsBase<K,·V,·FC>,\n····'sizeCalculation'·|·'ttl'·|·'noDisposeOnSet'·|·'noUpdateTTL'\n··>·{\n····/**\n·····*·If·size·tracking·is·enabled,·then·setting·an·explicit·size\n·····*·in·the·{@link·LRUCache#set}·call·will·prevent·calling·the\n·····*·{@link·OptionsBase.sizeCalculation}·function.\n·····*/\n····size?:·Size\n····/**\n·····*·If·TTL·tracking·is·enabled,·then·setting·an·explicit·start\n·····*·time·in·the·{@link·LRUCache#set}·call·will·override·the\n·····*·default·time·from·`performance.now()`·or·`Date.now()`.\n·····*\n·····*·Note·that·it·must·be·a·valid·value·for·whichever·time-tracking\n·····*·method·is·in·use.\n·····*/\n····start?:·Milliseconds\n····status?:·Status<K,·V>\n··}\n\n··/**\n···*·The·type·signature·for·the·{@link·OptionsBase.fetchMethod}·option.\n···*/\n··export·type·Fetcher<K,·V,·FC·=·unknown>·=·(\n····key:·K,\n····staleValue:·V·|·undefined,\n····options:·FetcherOptions<K,·V,·FC>,\n··)·=>·Promise<V·|·undefined·|·void>·|·V·|·undefined·|·void\n\n··/**\n···*·the·type·signature·for·the·{@link·OptionsBase.memoMethod}·option.\n···*/\n··export·type·Memoizer<K,·V,·FC·=·unknown>·=·(\n····key:·K,\n····staleValue:·V·|·undefined,\n····options:·MemoizerOptions<K,·V,·FC>,\n··)·=>·V\n\n··/**\n···*·Options·which·may·be·passed·to·the·{@link·LRUCache}·constructor.\n···*\n···*·Most·of·these·may·be·overridden·in·the·various·options·that·use\n···*·them.\n···*\n···*·Despite·all·being·technically·optional,·the·constructor·requires·that\n···*·a·cache·is·at·minimum·limited·by·one·or·more·of·{@link·OptionsBase.max},\n···*·{@link·OptionsBase.ttl},·or·{@link·OptionsBase.maxSize}.\n···*\n···*·If·{@link·OptionsBase.ttl}·is·used·alone,·then·it·is·strongly·advised\n···*·(and·in·fact·required·by·the·type·definitions·here)·that·the·cache\n···*·also·set·{@link·OptionsBase.ttlAutopurge},·to·prevent·potentially\n···*·unbounded·storage.\n···*\n···*·All·options·are·also·available·on·the·{@link·LRUCache}·instance,·making\n···*·it·safe·to·pass·an·LRUCache·instance·as·the·options·argumemnt·to\n···*·make·another·empty·cache·of·the·same·type.\n···*\n···*·Some·options·are·marked·as·read-only,·because·changing·them·after\n···*·instantiation·is·not·safe.·Changing·any·of·the·other·options·will·of\n···*·course·only·have·an·effect·on·subsequent·method·calls.\n···*/\n··export·interface·OptionsBase<K,·V,·FC>·{\n····/**\n·····*·The·maximum·number·of·items·to·store·in·the·cache·before·evicting\n·····*·old·entries.·This·is·read-only·on·the·{@link·LRUCache}·instance,\n·····*·and·may·not·be·overridden.\n·····*\n·····*·If·set,·then·storage·space·will·be·pre-allocated·at·construction\n·····*·time,·and·the·cache·will·perform·significantly·faster.\n·····*\n·····*·Note·that·significantly·fewer·items·may·be·stored,·if\n·····*·{@link·OptionsBase.maxSize}·and/or·{@link·OptionsBase.ttl}·are·also\n·····*·set.\n·····*\n·····*·**It·is·strongly·recommended·to·set·a·`max`·to·prevent·unbounded·growth\n·····*·of·the·cache.**\n·····*/\n····max?:·Count\n\n····/**\n·····*·Max·time·in·milliseconds·for·items·to·live·in·cache·before·they·are\n·····*·considered·stale.··Note·that·stale·items·are·NOT·preemptively·removed·by\n·····*·default,·and·MAY·live·in·the·cache,·contributing·to·its·LRU·max,·long\n·····*·after·they·have·expired,·unless·{@link·OptionsBase.ttlAutopurge}·is\n·····*·set.\n·····*\n·····*·If·set·to·`0`·(the·default·value),·then·that·means·\"do·not·track\n·····*·TTL\",·not·\"expire·immediately\".\n·····*\n·····*·Also,·as·this·cache·is·optimized·for·LRU/MRU·operations,·some·of\n·····*·the·staleness/TTL·checks·will·reduce·performance,·as·they·will·incur\n·····*·overhead·by·deleting·items.\n·····*\n·····*·This·is·not·primarily·a·TTL·cache,·and·does·not·make·strong·TTL\n·····*·guarantees.·There·is·no·pre-emptive·pruning·of·expired·items,·but·you\n·····*·_may_·set·a·TTL·on·the·cache,·and·it·will·treat·expired·items·as·missing\n·····*·when·they·are·fetched,·and·delete·them.\n·····*\n·····*·Optional,·but·must·be·a·non-negative·integer·in·ms·if·specified.\n·····*\n·····*·This·may·be·overridden·by·passing·an·options·object·to·`cache.set()`.\n·····*\n·····*·At·least·one·of·`max`,·`maxSize`,·or·`TTL`·is·required.·This·must·be·a\n·····*·positive·integer·if·set.\n·····*\n·····*·Even·if·ttl·tracking·is·enabled,·**it·is·strongly·recommended·to·set·a\n·····*·`max`·to·prevent·unbounded·growth·of·the·cache.**\n·····*\n·····*·If·ttl·tracking·is·enabled,·and·`max`·and·`maxSize`·are·not·set,\n·····*·and·`ttlAutopurge`·is·not·set,·then·a·warning·will·be·emitted\n·····*·cautioning·about·the·potential·for·unbounded·memory·consumption.\n·····*·(The·TypeScript·definitions·will·also·discourage·this.)\n·····*/\n····ttl?:·Milliseconds\n\n····/**\n·····*·Minimum·amount·of·time·in·ms·in·which·to·check·for·staleness.\n·····*·Defaults·to·1,·which·means·that·the·current·time·is·checked\n·····*·at·most·once·per·millisecond.\n·····*\n·····*·Set·to·0·to·check·the·current·time·every·time·staleness·is·tested.\n·····*·(This·reduces·performance,·and·is·theoretically·unnecessary.)\n·····*\n·····*·Setting·this·to·a·higher·value·will·improve·performance·somewhat\n·····*·while·using·ttl·tracking,·albeit·at·the·expense·of·keeping·stale\n·····*·items·around·a·bit·longer·than·their·TTLs·would·indicate.\n·····*\n·····*·@default·1\n·····*/\n····ttlResolution?:·Milliseconds\n\n····/**\n·····*·Preemptively·remove·stale·items·from·the·cache.\n·····*\n·····*·Note·that·this·may·*significantly*·degrade·performance,·especially·if\n·····*·the·cache·is·storing·a·large·number·of·items.·It·is·almost·always·best\n·····*·to·just·leave·the·stale·items·in·the·cache,·and·let·them·fall·out·as·new\n·····*·items·are·added.\n·····*\n·····*·Note·that·this·means·that·{@link·OptionsBase.allowStale}·is·a·bit\n·····*·pointless,·as·stale·items·will·be·deleted·almost·as·soon·as·they\n·····*·expire.\n·····*\n·····*·Use·with·caution!\n·····*/\n····ttlAutopurge?:·boolean\n\n····/**\n·····*·When·using·time-expiring·entries·with·`ttl`,·setting·this·to·`true`·will\n·····*·make·each·item's·age·reset·to·0·whenever·it·is·retrieved·from·cache·with\n·····*·{@link·LRUCache#get},·causing·it·to·not·expire.·(It·can·still·fall·out\n·····*·of·cache·based·on·recency·of·use,·of·course.)\n·····*\n·····*·Has·no·effect·if·{@link·OptionsBase.ttl}·is·not·set.\n·····*\n·····*·This·may·be·overridden·by·passing·an·options·object·to·`cache.get()`.\n·····*/\n····updateAgeOnGet?:·boolean\n\n····/**\n·····*·When·using·time-expiring·entries·with·`ttl`,·setting·this·to·`true`·will\n·····*·make·each·item's·age·reset·to·0·whenever·its·presence·in·the·cache·is\n·····*·checked·with·{@link·LRUCache#has},·causing·it·to·not·expire.·(It·can\n·····*·still·fall·out·of·cache·based·on·recency·of·use,·of·course.)\n·····*\n·····*·Has·no·effect·if·{@link·OptionsBase.ttl}·is·not·set.\n·····*/\n····updateAgeOnHas?:·boolean\n\n····/**\n·····*·Allow·{@link·LRUCache#get}·and·{@link·LRUCache#fetch}·calls·to·return\n·····*·stale·data,·if·available.\n·····*\n·····*·By·default,·if·you·set·`ttl`,·stale·items·will·only·be·deleted·from·the\n·····*·cache·when·you·`get(key)`.·That·is,·it's·not·preemptively·pruning·items,\n·····*·unless·{@link·OptionsBase.ttlAutopurge}·is·set.\n·····*\n·····*·If·you·set·`allowStale:true`,·it'll·return·the·stale·value·*as·well·as*\n·····*·deleting·it.·If·you·don't·set·this,·then·it'll·return·`undefined`·when\n·····*·you·try·to·get·a·stale·entry.\n·····*\n·····*·Note·that·when·a·stale·entry·is·fetched,·_even·if·it·is·returned·due·to\n·····*·`allowStale`·being·set_,·it·is·removed·from·the·cache·immediately.·You\n·····*·can·suppress·this·behavior·by·setting\n·····*·{@link·OptionsBase.noDeleteOnStaleGet},·either·in·the·constructor,·or·in\n·····*·the·options·provided·to·{@link·LRUCache#get}.\n·····*\n·····*·This·may·be·overridden·by·passing·an·options·object·to·`cache.get()`.\n·····*·The·`cache.has()`·method·will·always·return·`false`·for·stale·items.\n·····*\n·····*·Only·relevant·if·a·ttl·is·set.\n·····*/\n····allowStale?:·boolean\n\n····/**\n·····*·Function·that·is·called·on·items·when·they·are·dropped·from·the\n·····*·cache,·as·`dispose(value,·key,·reason)`.\n·····*\n·····*·This·can·be·handy·if·you·want·to·close·file·descriptors·or·do\n·····*·other·cleanup·tasks·when·items·are·no·longer·stored·in·the·cache.\n·····*\n·····*·**NOTE**:·It·is·called·_before_·the·item·has·been·fully·removed\n·····*·from·the·cache,·so·if·you·want·to·put·it·right·back·in,·you·need\n·····*·to·wait·until·the·next·tick.·If·you·try·to·add·it·back·in·during\n·····*·the·`dispose()`·function·call,·it·will·break·things·in·subtle·and\n·····*·weird·ways.\n·····*\n·····*·Unlike·several·other·options,·this·may·_not_·be·overridden·by\n·····*·passing·an·option·to·`set()`,·for·performance·reasons.\n·····*\n·····*·The·`reason`·will·be·one·of·the·following·strings,·corresponding\n·····*·to·the·reason·for·the·item's·deletion:\n·····*\n·····*·-·`evict`·Item·was·evicted·to·make·space·for·a·new·addition\n·····*·-·`set`·Item·was·overwritten·by·a·new·value\n·····*·-·`expire`·Item·expired·its·TTL\n·····*·-·`fetch`·Item·was·deleted·due·to·a·failed·or·aborted·fetch,·or·a\n·····*···fetchMethod·returning·`undefined.\n·····*·-·`delete`·Item·was·removed·by·explicit·`cache.delete(key)`,\n·····*···`cache.clear()`,·or·`cache.set(key,·undefined)`.\n·····*/\n····dispose?:·Disposer<K,·V>\n\n····/**\n·····*·Function·that·is·called·when·new·items·are·inserted·into·the·cache,\n·····*·as·`onInsert(value,·key,·reason)`.\n·····*\n·····*·This·can·be·useful·if·you·need·to·perform·actions·when·an·item·is\n·····*·added,·such·as·logging·or·tracking·insertions.\n·····*\n·····*·Unlike·some·other·options,·this·may·_not_·be·overridden·by·passing\n·····*·an·option·to·`set()`,·for·performance·and·consistency·reasons.\n·····*/\n····onInsert?:·Inserter<K,·V>\n\n····/**\n·····*·The·same·as·{@link·OptionsBase.dispose},·but·called·*after*·the·entry\n·····*·is·completely·removed·and·the·cache·is·once·again·in·a·clean·state.\n·····*\n·····*·It·is·safe·to·add·an·item·right·back·into·the·cache·at·this·point.\n·····*·However,·note·that·it·is·*very*·easy·to·inadvertently·create·infinite\n·····*·recursion·this·way.\n·····*/\n····disposeAfter?:·Disposer<K,·V>\n\n····/**\n·····*·Set·to·true·to·suppress·calling·the\n·····*·{@link·OptionsBase.dispose}·function·if·the·entry·key·is\n·····*·still·accessible·within·the·cache.\n·····*\n·····*·This·may·be·overridden·by·passing·an·options·object·to\n·····*·{@link·LRUCache#set}.\n·····*\n·····*·Only·relevant·if·`dispose`·or·`disposeAfter`·are·set.\n·····*/\n····noDisposeOnSet?:·boolean\n\n····/**\n·····*·Boolean·flag·to·tell·the·cache·to·not·update·the·TTL·when·setting·a·new\n·····*·value·for·an·existing·key·(ie,·when·updating·a·value·rather·than\n·····*·inserting·a·new·value).··Note·that·the·TTL·value·is·_always_·set·(if\n·····*·provided)·when·adding·a·new·entry·into·the·cache.\n·····*\n·····*·Has·no·effect·if·a·{@link·OptionsBase.ttl}·is·not·set.\n·····*\n·····*·May·be·passed·as·an·option·to·{@link·LRUCache#set}.\n·····*/\n····noUpdateTTL?:·boolean\n\n····/**\n·····*·Set·to·a·positive·integer·to·track·the·sizes·of·items·added·to·the\n·····*·cache,·and·automatically·evict·items·in·order·to·stay·below·this·size.\n·····*·Note·that·this·may·result·in·fewer·than·`max`·items·being·stored.\n·····*\n·····*·Attempting·to·add·an·item·to·the·cache·whose·calculated·size·is·greater\n·····*·that·this·amount·will·be·a·no-op.·The·item·will·not·be·cached,·and·no\n·····*·other·items·will·be·evicted.\n·····*\n·····*·Optional,·must·be·a·positive·integer·if·provided.\n·····*\n·····*·Sets·`maxEntrySize`·to·the·same·value,·unless·a·different·value·is\n·····*·provided·for·`maxEntrySize`.\n·····*\n·····*·At·least·one·of·`max`,·`maxSize`,·or·`TTL`·is·required.·This·must·be·a\n·····*·positive·integer·if·set.\n·····*\n·····*·Even·if·size·tracking·is·enabled,·**it·is·strongly·recommended·to·set·a\n·····*·`max`·to·prevent·unbounded·growth·of·the·cache.**\n·····*\n·····*·Note·also·that·size·tracking·can·negatively·impact·performance,\n·····*·though·for·most·cases,·only·minimally.\n·····*/\n····maxSize?:·Size\n\n····/**\n·····*·The·maximum·allowed·size·for·any·single·item·in·the·cache.\n·····*\n·····*·If·a·larger·item·is·passed·to·{@link·LRUCache#set}·or·returned·by·a\n·····*·{@link·OptionsBase.fetchMethod}·or·{@link·OptionsBase.memoMethod},·then\n·····*·it·will·not·be·stored·in·the·cache.\n·····*\n·····*·Attempting·to·add·an·item·whose·calculated·size·is·greater·than\n·····*·this·amount·will·not·cache·the·item·or·evict·any·old·items,·but\n·····*·WILL·delete·an·existing·value·if·one·is·already·present.\n·····*\n·····*·Optional,·must·be·a·positive·integer·if·provided.·Defaults·to\n·····*·the·value·of·`maxSize`·if·provided.\n·····*/\n····maxEntrySize?:·Size\n\n····/**\n·····*·A·function·that·returns·a·number·indicating·the·item's·size.\n·····*\n·····*·Requires·{@link·OptionsBase.maxSize}·to·be·set.\n·····*\n·····*·If·not·provided,·and·{@link·OptionsBase.maxSize}·or\n·····*·{@link·OptionsBase.maxEntrySize}·are·set,·then·all\n·····*·{@link·LRUCache#set}·calls·**must**·provide·an·explicit\n·····*·{@link·SetOptions.size}·or·sizeCalculation·param.\n·····*/\n····sizeCalculation?:·SizeCalculator<K,·V>\n\n····/**\n·····*·Method·that·provides·the·implementation·for·{@link·LRUCache#fetch}\n·····*\n·····*·```ts\n·····*·fetchMethod(key,·staleValue,·{·signal,·options,·context·})\n·····*·```\n·····*\n·····*·If·`fetchMethod`·is·not·provided,·then·`cache.fetch(key)`·is·equivalent\n·····*·to·`Promise.resolve(cache.get(key))`.\n·····*\n·····*·If·at·any·time,·`signal.aborted`·is·set·to·`true`,·or·if·the\n·····*·`signal.onabort`·method·is·called,·or·if·it·emits·an·`'abort'`·event\n·····*·which·you·can·listen·to·with·`addEventListener`,·then·that·means·that\n·····*·the·fetch·should·be·abandoned.·This·may·be·passed·along·to·async\n·····*·functions·aware·of·AbortController/AbortSignal·behavior.\n·····*\n·····*·The·`fetchMethod`·should·**only**·return·`undefined`·or·a·Promise\n·····*·resolving·to·`undefined`·if·the·AbortController·signaled·an·`abort`\n·····*·event.·In·all·other·cases,·it·should·return·or·resolve·to·a·value\n·····*·suitable·for·adding·to·the·cache.\n·····*\n·····*·The·`options`·object·is·a·union·of·the·options·that·may·be·provided·to\n·····*·`set()`·and·`get()`.·If·they·are·modified,·then·that·will·result·in\n·····*·modifying·the·settings·to·`cache.set()`·when·the·value·is·resolved,·and\n·····*·in·the·case·of\n·····*·{@link·OptionsBase.noDeleteOnFetchRejection}·and\n·····*·{@link·OptionsBase.allowStaleOnFetchRejection},·the·handling·of\n·····*·`fetchMethod`·failures.\n·····*\n·····*·For·example,·a·DNS·cache·may·update·the·TTL·based·on·the·value·returned\n·····*·from·a·remote·DNS·server·by·changing·`options.ttl`·in·the·`fetchMethod`.\n·····*/\n····fetchMethod?:·Fetcher<K,·V,·FC>\n\n····/**\n·····*·Method·that·provides·the·implementation·for·{@link·LRUCache#memo}\n·····*/\n····memoMethod?:·Memoizer<K,·V,·FC>\n\n····/**\n·····*·Set·to·true·to·suppress·the·deletion·of·stale·data·when·a\n·····*·{@link·OptionsBase.fetchMethod}·returns·a·rejected·promise.\n·····*/\n····noDeleteOnFetchRejection?:·boolean\n\n····/**\n·····*·Do·not·delete·stale·items·when·they·are·retrieved·with\n·····*·{@link·LRUCache#get}.\n·····*\n·····*·Note·that·the·`get`·return·value·will·still·be·`undefined`\n·····*·unless·{@link·OptionsBase.allowStale}·is·true.\n·····*\n·····*·When·using·time-expiring·entries·with·`ttl`,·by·default·stale\n·····*·items·will·be·removed·from·the·cache·when·the·key·is·accessed\n·····*·with·`cache.get()`.\n·····*\n·····*·Setting·this·option·will·cause·stale·items·to·remain·in·the·cache,·until\n·····*·they·are·explicitly·deleted·with·`cache.delete(key)`,·or·retrieved·with\n·····*·`noDeleteOnStaleGet`·set·to·`false`.\n·····*\n·····*·This·may·be·overridden·by·passing·an·options·object·to·`cache.get()`.\n·····*\n·····*·Only·relevant·if·a·ttl·is·used.\n·····*/\n····noDeleteOnStaleGet?:·boolean\n\n····/**\n·····*·Set·to·true·to·allow·returning·stale·data·when·a\n·····*·{@link·OptionsBase.fetchMethod}·throws·an·error·or·returns·a·rejected\n·····*·promise.\n·····*\n·····*·This·differs·from·using·{@link·OptionsBase.allowStale}·in·that·stale\n·····*·data·will·ONLY·be·returned·in·the·case·that·the·{@link·LRUCache#fetch}\n·····*·fails,·not·any·other·times.\n·····*\n·····*·If·a·`fetchMethod`·fails,·and·there·is·no·stale·value·available,·the\n·····*·`fetch()`·will·resolve·to·`undefined`.·Ie,·all·`fetchMethod`·errors·are\n·····*·suppressed.\n·····*\n·····*·Implies·`noDeleteOnFetchRejection`.\n·····*\n·····*·This·may·be·set·in·calls·to·`fetch()`,·or·defaulted·on·the·constructor,\n·····*·or·overridden·by·modifying·the·options·object·in·the·`fetchMethod`.\n·····*/\n····allowStaleOnFetchRejection?:·boolean\n\n····/**\n·····*·Set·to·true·to·return·a·stale·value·from·the·cache·when·the\n·····*·`AbortSignal`·passed·to·the·{@link·OptionsBase.fetchMethod}·dispatches\n·····*·an·`'abort'`·event,·whether·user-triggered,·or·due·to·internal·cache\n·····*·behavior.\n·····*\n·····*·Unless·{@link·OptionsBase.ignoreFetchAbort}·is·also·set,·the·underlying\n·····*·{@link·OptionsBase.fetchMethod}·will·still·be·considered·canceled,·and\n·····*·any·value·it·returns·will·be·ignored·and·not·cached.\n·····*\n·····*·Caveat:·since·fetches·are·aborted·when·a·new·value·is·explicitly\n·····*·set·in·the·cache,·this·can·lead·to·fetch·returning·a·stale·value,\n·····*·since·that·was·the·fallback·value·_at·the·moment·the·`fetch()`·was\n·····*·initiated_,·even·though·the·new·updated·value·is·now·present·in\n·····*·the·cache.\n·····*\n·····*·For·example:\n·····*\n·····*·```ts\n·····*·const·cache·=·new·LRUCache<string,·any>({\n·····*···ttl:·100,\n·····*···fetchMethod:·async·(url,·oldValue,·{·signal·})·=>··{\n·····*·····const·res·=·await·fetch(url,·{·signal·})\n·····*·····return·await·res.json()\n·····*···}\n·····*·})\n·····*·cache.set('https://example.com/',·{·some:·'data'·})\n·····*·//·100ms·go·by...\n·····*·const·result·=·cache.fetch('https://example.com/')\n·····*·cache.set('https://example.com/',·{·other:·'thing'·})\n·····*·console.log(await·result)·//·{·some:·'data'·}\n·····*·console.log(cache.get('https://example.com/'))·//·{·other:·'thing'·}\n·····*·```\n·····*/\n····allowStaleOnFetchAbort?:·boolean\n\n····/**\n·····*·Set·to·true·to·ignore·the·`abort`·event·emitted·by·the·`AbortSignal`\n·····*·object·passed·to·{@link·OptionsBase.fetchMethod},·and·still·cache·the\n·····*·resulting·resolution·value,·as·long·as·it·is·not·`undefined`.\n·····*\n·····*·When·used·on·its·own,·this·means·aborted·{@link·LRUCache#fetch}·calls\n·····*·are·not·immediately·resolved·or·rejected·when·they·are·aborted,·and\n·····*·instead·take·the·full·time·to·await.\n·····*\n·····*·When·used·with·{@link·OptionsBase.allowStaleOnFetchAbort},·aborted\n·····*·{@link·LRUCache#fetch}·calls·will·resolve·immediately·to·their·stale\n·····*·cached·value·or·`undefined`,·and·will·continue·to·process·and·eventually\n·····*·update·the·cache·when·they·resolve,·as·long·as·the·resulting·value·is\n·····*·not·`undefined`,·thus·supporting·a·\"return·stale·on·timeout·while\n·····*·refreshing\"·mechanism·by·passing·`AbortSignal.timeout(n)`·as·the·signal.\n·····*\n·····*·For·example:\n·····*\n·····*·```ts\n·····*·const·c·=·new·LRUCache({\n·····*···ttl:·100,\n·····*···ignoreFetchAbort:·true,\n·····*···allowStaleOnFetchAbort:·true,\n·····*···fetchMethod:·async·(key,·oldValue,·{·signal·})·=>·{\n·····*·····//·note:·do·NOT·pass·the·signal·to·fetch()!\n·····*·····//·let's·say·this·fetch·can·take·a·long·time.\n·····*·····const·res·=·await·fetch(`https://slow-backend-server/${key}`)\n·····*·····return·await·res.json()\n·····*···},\n·····*·})\n·····*\n·····*·//·this·will·return·the·stale·value·after·100ms,·while·still\n·····*·//·updating·in·the·background·for·next·time.\n·····*·const·val·=·await·c.fetch('key',·{·signal:·AbortSignal.timeout(100)·})\n·····*·```\n·····*\n·····*·**Note**:·regardless·of·this·setting,·an·`abort`·event·_is·still\n·····*·emitted·on·the·`AbortSignal`·object_,·so·may·result·in·invalid·results\n·····*·when·passed·to·other·underlying·APIs·that·use·AbortSignals.\n·····*\n·····*·This·may·be·overridden·in·the·{@link·OptionsBase.fetchMethod}·or·the\n·····*·call·to·{@link·LRUCache#fetch}.\n·····*/\n····ignoreFetchAbort?:·boolean\n\n····/**\n·····*·In·some·cases,·you·may·want·to·swap·out·the·performance/Date·object\n·····*·used·for·TTL·tracking.·This·should·almost·certainly·NOT·be·done·in\n·····*·production·environments!\n·····*\n·····*·This·value·defaults·to·`global.performance`·if·it·has·a·`now()`·method,\n·····*·or·the·`global.Date`·object·otherwise.\n·····*/\n····perf?:·Perf\n··}\n\n··export·interface·OptionsMaxLimit<K,·V,·FC>·extends·OptionsBase<\n····K,\n····V,\n····FC\n··>·{\n····max:·Count\n··}\n··export·interface·OptionsTTLLimit<K,·V,·FC>·extends·OptionsBase<\n····K,\n····V,\n····FC\n··>·{\n····ttl:·Milliseconds\n····ttlAutopurge:·boolean\n··}\n··export·interface·OptionsSizeLimit<K,·V,·FC>·extends·OptionsBase<\n····K,\n····V,\n····FC\n··>·{\n····maxSize:·Size\n··}\n\n··/**\n···*·The·valid·safe·options·for·the·{@link·LRUCache}·constructor\n···*/\n··export·type·Options<K,·V,·FC>·=\n····|·OptionsMaxLimit<K,·V,·FC>\n····|·OptionsSizeLimit<K,·V,·FC>\n····|·OptionsTTLLimit<K,·V,·FC>\n\n··/**\n···*·Entry·objects·used·by·{@link·LRUCache#load}·and·{@link·LRUCache#dump},\n···*·and·returned·by·{@link·LRUCache#info}.\n···*/\n··export·interface·Entry<V>·{\n····value:·V\n····ttl?:·Milliseconds\n····size?:·Size\n····start?:·Milliseconds\n··}\n}\n\n/**\n·*·Default·export,·the·thing·you're·using·this·module·to·get.\n·*\n·*·The·`K`·and·`V`·types·define·the·key·and·value·types,·respectively.·The\n·*·optional·`FC`·type·defines·the·type·of·the·`context`·object·passed·to\n·*·`cache.fetch()`·and·`cache.memo()`.\n·*\n·*·Keys·and·values·**must·not**·be·`null`·or·`undefined`.\n·*\n·*·All·properties·from·the·options·object·(with·the·exception·of·`max`,\n·*·`maxSize`,·`fetchMethod`,·`memoMethod`,·`dispose`·and·`disposeAfter`)·are\n·*·added·as·normal·public·members.·(The·listed·options·are·read-only·getters.)\n·*\n·*·Changing·any·of·these·will·alter·the·defaults·for·subsequent·method·calls.\n·*/\nexport·class·LRUCache<K·extends·{},·V·extends·{},·FC·=·unknown>·{\n··//·options·that·cannot·be·changed·without·disaster\n··readonly·#max:·LRUCache.Count\n··readonly·#maxSize:·LRUCache.Size\n··readonly·#dispose?:·LRUCache.Disposer<K,·V>\n··readonly·#onInsert?:·LRUCache.Inserter<K,·V>\n··readonly·#disposeAfter?:·LRUCache.Disposer<K,·V>\n··readonly·#fetchMethod?:·LRUCache.Fetcher<K,·V,·FC>\n··readonly·#memoMethod?:·LRUCache.Memoizer<K,·V,·FC>\n··readonly·#perf:·Perf\n\n··/**\n···*·{@link·LRUCache.OptionsBase.perf}\n···*/\n··get·perf()·{\n····return·this.#perf\n··}\n\n··/**\n···*·{@link·LRUCache.OptionsBase.ttl}\n···*/\n··ttl:·LRUCache.Milliseconds\n\n··/**\n···*·{@link·LRUCache.OptionsBase.ttlResolution}\n···*/\n··ttlResolution:·LRUCache.Milliseconds\n··/**\n···*·{@link·LRUCache.OptionsBase.ttlAutopurge}\n···*/\n··ttlAutopurge:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.updateAgeOnGet}\n···*/\n··updateAgeOnGet:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.updateAgeOnHas}\n···*/\n··updateAgeOnHas:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.allowStale}\n···*/\n··allowStale:·boolean\n\n··/**\n···*·{@link·LRUCache.OptionsBase.noDisposeOnSet}\n···*/\n··noDisposeOnSet:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.noUpdateTTL}\n···*/\n··noUpdateTTL:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.maxEntrySize}\n···*/\n··maxEntrySize:·LRUCache.Size\n··/**\n···*·{@link·LRUCache.OptionsBase.sizeCalculation}\n···*/\n··sizeCalculation?:·LRUCache.SizeCalculator<K,·V>\n··/**\n···*·{@link·LRUCache.OptionsBase.noDeleteOnFetchRejection}\n···*/\n··noDeleteOnFetchRejection:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.noDeleteOnStaleGet}\n···*/\n··noDeleteOnStaleGet:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.allowStaleOnFetchAbort}\n···*/\n··allowStaleOnFetchAbort:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.allowStaleOnFetchRejection}\n···*/\n··allowStaleOnFetchRejection:·boolean\n··/**\n···*·{@link·LRUCache.OptionsBase.ignoreFetchAbort}\n···*/\n··ignoreFetchAbort:·boolean\n\n··//·computed·properties\n··#size:·LRUCache.Count\n··#calculatedSize:·LRUCache.Size\n··#keyMap:·Map<K,·Index>\n··#keyList:·(K·|·undefined)[]\n··#valList:·(V·|·BackgroundFetch<V>·|·undefined)[]\n··#next:·NumberArray\n··#prev:·NumberArray\n··#head:·Index\n··#tail:·Index\n··#free:·StackLike\n··#disposed?:·DisposeTask<K,·V>[]\n··#sizes?:·ZeroArray\n··#starts?:·ZeroArray\n··#ttls?:·ZeroArray\n··#autopurgeTimers?:·(undefined·|·ReturnType<typeof·setTimeout>)[]\n\n··#hasDispose:·boolean\n··#hasFetchMethod:·boolean\n··#hasDisposeAfter:·boolean\n··#hasOnInsert:·boolean\n\n··/**\n···*·Do·not·call·this·method·unless·you·need·to·inspect·the\n···*·inner·workings·of·the·cache.··If·anything·returned·by·this\n···*·object·is·modified·in·any·way,·strange·breakage·may·occur.\n···*\n···*·These·fields·are·private·for·a·reason!\n···*\n···*·@internal\n···*/\n··static·unsafeExposeInternals<\n····K·extends·{},\n····V·extends·{},\n····FC·extends·unknown·=·unknown,\n··>(c:·LRUCache<K,·V,·FC>)·{\n····return·{\n······//·properties\n······starts:·c.#starts,\n······ttls:·c.#ttls,\n······autopurgeTimers:·c.#autopurgeTimers,\n······sizes:·c.#sizes,\n······keyMap:·c.#keyMap·as·Map<K,·number>,\n······keyList:·c.#keyList,\n······valList:·c.#valList,\n······next:·c.#next,\n······prev:·c.#prev,\n······get·head()·{\n········return·c.#head\n······},\n······get·tail()·{\n········return·c.#tail\n······},\n······free:·c.#free,\n······//·methods\n······isBackgroundFetch:·(p:·unknown)·=>·c.#isBackgroundFetch(p),\n······backgroundFetch:·(\n········k:·K,\n········index:·number·|·undefined,\n········options:·LRUCache.FetchOptions<K,·V,·FC>,\n········context:·unknown,\n······):·BackgroundFetch<V>·=>\n········c.#backgroundFetch(\n··········k,\n··········index·as·Index·|·undefined,\n··········options,\n··········context·as·FC,\n········),\n······moveToTail:·(index:·number):·void·=>·c.#moveToTail(index·as·Index),\n······indexes:·(options?:·{·allowStale:·boolean·})·=>·c.#indexes(options),\n······rindexes:·(options?:·{·allowStale:·boolean·})·=>\n········c.#rindexes(options),\n······isStale:·(index:·number·|·undefined)·=>·c.#isStale(index·as·Index),\n····}\n··}\n\n··//·Protected·read-only·members\n\n··/**\n···*·{@link·LRUCache.OptionsBase.max}·(read-only)\n···*/\n··get·max():·LRUCache.Count·{\n····return·this.#max\n··}\n··/**\n···*·{@link·LRUCache.OptionsBase.maxSize}·(read-only)\n···*/\n··get·maxSize():·LRUCache.Count·{\n····return·this.#maxSize\n··}\n··/**\n···*·The·total·computed·size·of·items·in·the·cache·(read-only)\n···*/\n··get·calculatedSize():·LRUCache.Size·{\n····return·this.#calculatedSize\n··}\n··/**\n···*·The·number·of·items·stored·in·the·cache·(read-only)\n···*/\n··get·size():·LRUCache.Count·{\n····return·this.#size\n··}\n··/**\n···*·{@link·LRUCache.OptionsBase.fetchMethod}·(read-only)\n···*/\n··get·fetchMethod():·LRUCache.Fetcher<K,·V,·FC>·|·undefined·{\n····return·this.#fetchMethod\n··}\n··get·memoMethod():·LRUCache.Memoizer<K,·V,·FC>·|·undefined·{\n····return·this.#memoMethod\n··}\n··/**\n···*·{@link·LRUCache.OptionsBase.dispose}·(read-only)\n···*/\n··get·dispose()·{\n····return·this.#dispose\n··}\n··/**\n···*·{@link·LRUCache.OptionsBase.onInsert}·(read-only)\n···*/\n··get·onInsert()·{\n····return·this.#onInsert\n··}\n··/**\n···*·{@link·LRUCache.OptionsBase.disposeAfter}·(read-only)\n···*/\n··get·disposeAfter()·{\n····return·this.#disposeAfter\n··}\n\n··constructor(options:·LRUCache.Options<K,·V,·FC>·|·LRUCache<K,·V,·FC>)·{\n····const·{\n······max·=·0,\n······ttl,\n······ttlResolution·=·1,\n······ttlAutopurge,\n······updateAgeOnGet,\n······updateAgeOnHas,\n······allowStale,\n······dispose,\n······onInsert,\n······disposeAfter,\n······noDisposeOnSet,\n······noUpdateTTL,\n······maxSize·=·0,\n······maxEntrySize·=·0,\n······sizeCalculation,\n······fetchMethod,\n······memoMethod,\n······noDeleteOnFetchRejection,\n······noDeleteOnStaleGet,\n······allowStaleOnFetchRejection,\n······allowStaleOnFetchAbort,\n······ignoreFetchAbort,\n······perf,\n····}·=·options\n\n····if·(perf·!==·undefined)·{\n······if·(typeof·perf?.now·!==·'function')·{\n········throw·new·TypeError(\n··········'perf·option·must·have·a·now()·method·if·specified',\n········)\n······}\n····}\n\n····this.#perf·=·perf·??·defaultPerf\n\n····if·(max·!==·0·&&·!isPosInt(max))·{\n······throw·new·TypeError('max·option·must·be·a·nonnegative·integer')\n····}\n\n····const·UintArray·=·max·?·getUintArray(max)·:·Array\n····if·(!UintArray)·{\n······throw·new·Error('invalid·max·value:·'·+·max)\n····}\n\n····this.#max·=·max\n····this.#maxSize·=·maxSize\n····this.maxEntrySize·=·maxEntrySize·||·this.#maxSize\n····this.sizeCalculation·=·sizeCalculation\n····if·(this.sizeCalculation)·{\n······if·(!this.#maxSize·&&·!this.maxEntrySize)·{\n········throw·new·TypeError(\n··········'cannot·set·sizeCalculation·without·setting·maxSize·or·maxEntrySize',\n········)\n······}\n······if·(typeof·this.sizeCalculation·!==·'function')·{\n········throw·new·TypeError('sizeCalculation·set·to·non-function')\n······}\n····}\n\n····if·(memoMethod·!==·undefined·&&·typeof·memoMethod·!==·'function')·{\n······throw·new·TypeError('memoMethod·must·be·a·function·if·defined')\n····}\n····this.#memoMethod·=·memoMethod\n\n····if·(fetchMethod·!==·undefined·&&·typeof·fetchMethod·!==·'function')·{\n······throw·new·TypeError('fetchMethod·must·be·a·function·if·specified')\n····}\n····this.#fetchMethod·=·fetchMethod\n····this.#hasFetchMethod·=·!!fetchMethod\n\n····this.#keyMap·=·new·Map()\n····this.#keyList·=·Array.from({·length:·max·}).fill(undefined)·as·(\n······|·K\n······|·undefined\n····)[]\n····this.#valList·=·Array.from({·length:·max·}).fill(undefined)·as·(\n······|·V\n······|·undefined\n····)[]\n····this.#next·=·new·UintArray(max)\n····this.#prev·=·new·UintArray(max)\n····this.#head·=·0·as·Index\n····this.#tail·=·0·as·Index\n····this.#free·=·Stack.create(max)\n····this.#size·=·0\n····this.#calculatedSize·=·0\n\n····if·(typeof·dispose·===·'function')·{\n······this.#dispose·=·dispose\n····}\n····if·(typeof·onInsert·===·'function')·{\n······this.#onInsert·=·onInsert\n····}\n····if·(typeof·disposeAfter·===·'function')·{\n······this.#disposeAfter·=·disposeAfter\n······this.#disposed·=·[]\n····}·else·{\n······this.#disposeAfter·=·undefined\n······this.#disposed·=·undefined\n····}\n····this.#hasDispose·=·!!this.#dispose\n····this.#hasOnInsert·=·!!this.#onInsert\n····this.#hasDisposeAfter·=·!!this.#disposeAfter\n\n····this.noDisposeOnSet·=·!!noDisposeOnSet\n····this.noUpdateTTL·=·!!noUpdateTTL\n····this.noDeleteOnFetchRejection·=·!!noDeleteOnFetchRejection\n····this.allowStaleOnFetchRejection·=·!!allowStaleOnFetchRejection\n····this.allowStaleOnFetchAbort·=·!!allowStaleOnFetchAbort\n····this.ignoreFetchAbort·=·!!ignoreFetchAbort\n\n····//·NB:·maxEntrySize·is·set·to·maxSize·if·it's·set\n····if·(this.maxEntrySize·!==·0)·{\n······if·(this.#maxSize·!==·0)·{\n········if·(!isPosInt(this.#maxSize))·{\n··········throw·new·TypeError(\n············'maxSize·must·be·a·positive·integer·if·specified',\n··········)\n········}\n······}\n······if·(!isPosInt(this.maxEntrySize))·{\n········throw·new·TypeError(\n··········'maxEntrySize·must·be·a·positive·integer·if·specified',\n········)\n······}\n······this.#initializeSizeTracking()\n····}\n\n····this.allowStale·=·!!allowStale\n····this.noDeleteOnStaleGet·=·!!noDeleteOnStaleGet\n····this.updateAgeOnGet·=·!!updateAgeOnGet\n····this.updateAgeOnHas·=·!!updateAgeOnHas\n····this.ttlResolution·=\n······isPosInt(ttlResolution)·||·ttlResolution·===·0·?·ttlResolution·:·1\n····this.ttlAutopurge·=·!!ttlAutopurge\n····this.ttl·=·ttl·||·0\n····if·(this.ttl)·{\n······if·(!isPosInt(this.ttl))·{\n········throw·new·TypeError('ttl·must·be·a·positive·integer·if·specified')\n······}\n······this.#initializeTTLTracking()\n····}\n\n····//·do·not·allow·completely·unbounded·caches\n····if·(this.#max·===·0·&&·this.ttl·===·0·&&·this.#maxSize·===·0)·{\n······throw·new·TypeError(\n········'At·least·one·of·max,·maxSize,·or·ttl·is·required',\n······)\n····}\n····if·(!this.ttlAutopurge·&&·!this.#max·&&·!this.#maxSize)·{\n······const·code·=·'LRU_CACHE_UNBOUNDED'\n······if·(shouldWarn(code))·{\n········warned.add(code)\n········const·msg·=\n··········'TTL·caching·without·ttlAutopurge,·max,·or·maxSize·can·'·+\n··········'result·in·unbounded·memory·consumption.'\n········emitWarning(msg,·'UnboundedCacheWarning',·code,·LRUCache)\n······}\n····}\n··}\n\n··/**\n···*·Return·the·number·of·ms·left·in·the·item's·TTL.·If·item·is·not·in·cache,\n···*·returns·`0`.·Returns·`Infinity`·if·item·is·in·cache·without·a·defined·TTL.\n···*/\n··getRemainingTTL(key:·K)·{\n····return·this.#keyMap.has(key)·?·Infinity·:·0\n··}\n\n··#initializeTTLTracking()·{\n····const·ttls·=·new·ZeroArray(this.#max)\n····const·starts·=·new·ZeroArray(this.#max)\n····this.#ttls·=·ttls\n····this.#starts·=·starts\n····const·purgeTimers·=\n······this.ttlAutopurge·?\n········Array.from<undefined·|·ReturnType<typeof·setTimeout>>({\n··········length:·this.#max,\n········})\n······:·undefined\n····this.#autopurgeTimers·=·purgeTimers\n\n····this.#setItemTTL·=·(index,·ttl,·start·=·this.#perf.now())·=>·{\n······starts[index]·=·ttl·!==·0·?·start·:·0\n······ttls[index]·=·ttl\n······setPurgetTimer(index,·ttl)\n····}\n\n····this.#updateItemAge·=·index·=>·{\n······starts[index]·=·ttls[index]·!==·0·?·this.#perf.now()·:·0\n······setPurgetTimer(index,·ttls[index])\n····}\n\n····//·clear·out·the·purge·timer·if·we're·setting·TTL·to·0,·and\n····//·previously·had·a·ttl·purge·timer·running,·so·it·doesn't\n····//·fire·unnecessarily.·Don't·need·to·do·this·if·we're·not·doing\n····//·autopurge.\n····const·setPurgetTimer·=\n······!this.ttlAutopurge·?\n········()·=>·{}\n······:·(index:·Index,·ttl?:·number)·=>·{\n··········if·(purgeTimers?.[index])·{\n············clearTimeout(purgeTimers[index])\n············purgeTimers[index]·=·undefined\n··········}\n··········if·(ttl·&&·ttl·!==·0·&&·purgeTimers)·{\n············const·t·=·setTimeout(()·=>·{\n··············if·(this.#isStale(index))·{\n················this.#delete(this.#keyList[index]·as·K,·'expire')\n··············}\n············},·ttl·+·1)\n············//·unref()·not·supported·on·all·platforms\n············/*·c8·ignore·start·*/\n············if·(t.unref)·{\n··············t.unref()\n············}\n············/*·c8·ignore·stop·*/\n············purgeTimers[index]·=·t\n··········}\n········}\n\n····this.#statusTTL·=·(status,·index)·=>·{\n······if·(ttls[index])·{\n········const·ttl·=·ttls[index]\n········const·start·=·starts[index]\n········/*·c8·ignore·start·*/\n········if·(!ttl·||·!start)·{\n··········return\n········}\n········/*·c8·ignore·stop·*/\n········status.ttl·=·ttl\n········status.start·=·start\n········status.now·=·cachedNow·||·getNow()\n········const·age·=·status.now·-·start\n········status.remainingTTL·=·ttl·-·age\n······}\n····}\n\n····//·debounce·calls·to·perf.now()·to·1s·so·we're·not·hitting\n····//·that·costly·call·repeatedly.\n····let·cachedNow·=·0\n····const·getNow·=·()·=>·{\n······const·n·=·this.#perf.now()\n······if·(this.ttlResolution·>·0)·{\n········cachedNow·=·n\n········const·t·=·setTimeout(()·=>·(cachedNow·=·0),·this.ttlResolution)\n········//·not·available·on·all·platforms\n········/*·c8·ignore·start·*/\n········if·(t.unref)·{\n··········t.unref()\n········}\n········/*·c8·ignore·stop·*/\n······}\n······return·n\n····}\n\n····this.getRemainingTTL·=·key·=>·{\n······const·index·=·this.#keyMap.get(key)\n······if·(index·===·undefined)·{\n········return·0\n······}\n······const·ttl·=·ttls[index]\n······const·start·=·starts[index]\n······if·(!ttl·||·!start)·{\n········return·Infinity\n······}\n······const·age·=·(cachedNow·||·getNow())·-·start\n······return·ttl·-·age\n····}\n\n····this.#isStale·=·index·=>·{\n······const·s·=·starts[index]\n······const·t·=·ttls[index]\n······return·!!t·&&·!!s·&&·(cachedNow·||·getNow())·-·s·>·t\n····}\n··}\n\n··//·conditionally·set·private·methods·related·to·TTL\n··#updateItemAge:·(index:·Index)·=>·void·=·()·=>·{}\n··#statusTTL:·(status:·LRUCache.Status<K,·V>,·index:·Index)·=>·void·=\n····()·=>·{}\n··#setItemTTL:·(\n····index:·Index,\n····ttl:·LRUCache.Milliseconds,\n····start?:·LRUCache.Milliseconds,\n····//·ignore·because·we·never·call·this·if·we're·not·already·in·TTL·mode\n····/*·c8·ignore·start·*/\n··)·=>·void·=·()·=>·{}\n··/*·c8·ignore·stop·*/\n\n··#isStale:·(index:·Index)·=>·boolean·=·()·=>·false\n\n··#initializeSizeTracking()·{\n····const·sizes·=·new·ZeroArray(this.#max)\n····this.#calculatedSize·=·0\n····this.#sizes·=·sizes\n····this.#removeItemSize·=·index·=>·{\n······this.#calculatedSize·-=·sizes[index]·as·number\n······sizes[index]·=·0\n····}\n····this.#requireSize·=·(k,·v,·size,·sizeCalculation)·=>·{\n······//·provisionally·accept·background·fetches.\n······//·actual·value·size·will·be·checked·when·they·return.\n······if·(this.#isBackgroundFetch(v))·{\n········return·0\n······}\n······if·(!isPosInt(size))·{\n········if·(sizeCalculation)·{\n··········if·(typeof·sizeCalculation·!==·'function')·{\n············throw·new·TypeError('sizeCalculation·must·be·a·function')\n··········}\n··········size·=·sizeCalculation(v,·k)\n··········if·(!isPosInt(size))·{\n············throw·new·TypeError(\n··············'sizeCalculation·return·invalid·(expect·positive·integer)',\n············)\n··········}\n········}·else·{\n··········throw·new·TypeError(\n············'invalid·size·value·(must·be·positive·integer).·'·+\n··············'When·maxSize·or·maxEntrySize·is·used,·sizeCalculation·'·+\n··············'or·size·must·be·set.',\n··········)\n········}\n······}\n······return·size\n····}\n\n····this.#addItemSize·=·(\n······index:·Index,\n······size:·LRUCache.Size,\n······status?:·LRUCache.Status<K,·V>,\n····)·=>·{\n······sizes[index]·=·size\n······if·(this.#maxSize)·{\n········const·maxSize·=·this.#maxSize·-·(sizes[index]·as·number)\n········while·(this.#calculatedSize·>·maxSize)·{\n··········this.#evict(true)\n········}\n······}\n······this.#calculatedSize·+=·sizes[index]·as·number\n······if·(status)·{\n········status.entrySize·=·size\n········status.totalCalculatedSize·=·this.#calculatedSize\n······}\n····}\n··}\n\n··#removeItemSize:·(index:·Index)·=>·void·=·_i·=>·{}\n\n··#addItemSize:·(\n····index:·Index,\n····size:·LRUCache.Size,\n····status?:·LRUCache.Status<K,·V>,\n··)·=>·void·=·(_i,·_s,·_st)·=>·{}\n\n··#requireSize:·(\n····k:·K,\n····v:·V·|·BackgroundFetch<V>,\n····size?:·LRUCache.Size,\n····sizeCalculation?:·LRUCache.SizeCalculator<K,·V>,\n····status?:·LRUCache.Status<K,·V>,\n··)·=>·LRUCache.Size·=·(\n····_k:·K,\n····_v:·V·|·BackgroundFetch<V>,\n····size?:·LRUCache.Size,\n····sizeCalculation?:·LRUCache.SizeCalculator<K,·V>,\n··)·=>·{\n····if·(size·||·sizeCalculation)·{\n······throw·new·TypeError(\n········'cannot·set·size·without·setting·maxSize·or·maxEntrySize·on·cache',\n······)\n····}\n····return·0\n··};\n\n··*#indexes({·allowStale·=·this.allowStale·}·=·{})·{\n····if·(this.#size)·{\n······for·(let·i·=·this.#tail;·this.#isValidIndex(i);·)·{\n········if·(allowStale·||·!this.#isStale(i))·{\n··········yield·i\n········}\n········if·(i·===·this.#head)·{\n··········break\n········}·else·{\n··········i·=·this.#prev[i]·as·Index\n········}\n······}\n····}\n··}\n\n··*#rindexes({·allowStale·=·this.allowStale·}·=·{})·{\n····if·(this.#size)·{\n······for·(let·i·=·this.#head;·this.#isValidIndex(i);·)·{\n········if·(allowStale·||·!this.#isStale(i))·{\n··········yield·i\n········}\n········if·(i·===·this.#tail)·{\n··········break\n········}·else·{\n··········i·=·this.#next[i]·as·Index\n········}\n······}\n····}\n··}\n\n··#isValidIndex(index:·Index)·{\n····return·(\n······index·!==·undefined·&&\n······this.#keyMap.get(this.#keyList[index]·as·K)·===·index\n····)\n··}\n\n··/**\n···*·Return·a·generator·yielding·`[key,·value]`·pairs,\n···*·in·order·from·most·recently·used·to·least·recently·used.\n···*/\n··*entries()·{\n····for·(const·i·of·this.#indexes())·{\n······if·(\n········this.#valList[i]·!==·undefined·&&\n········this.#keyList[i]·!==·undefined·&&\n········!this.#isBackgroundFetch(this.#valList[i])\n······)·{\n········yield·[this.#keyList[i],·this.#valList[i]]·as·[K,·V]\n······}\n····}\n··}\n\n··/**\n···*·Inverse·order·version·of·{@link·LRUCache.entries}\n···*\n···*·Return·a·generator·yielding·`[key,·value]`·pairs,\n···*·in·order·from·least·recently·used·to·most·recently·used.\n···*/\n··*rentries()·{\n····for·(const·i·of·this.#rindexes())·{\n······if·(\n········this.#valList[i]·!==·undefined·&&\n········this.#keyList[i]·!==·undefined·&&\n········!this.#isBackgroundFetch(this.#valList[i])\n······)·{\n········yield·[this.#keyList[i],·this.#valList[i]]\n······}\n····}\n··}\n\n··/**\n···*·Return·a·generator·yielding·the·keys·in·the·cache,\n···*·in·order·from·most·recently·used·to·least·recently·used.\n···*/\n··*keys()·{\n····for·(const·i·of·this.#indexes())·{\n······const·k·=·this.#keyList[i]\n······if·(k·!==·undefined·&&·!this.#isBackgroundFetch(this.#valList[i]))·{\n········yield·k\n······}\n····}\n··}\n\n··/**\n···*·Inverse·order·version·of·{@link·LRUCache.keys}\n···*\n···*·Return·a·generator·yielding·the·keys·in·the·cache,\n···*·in·order·from·least·recently·used·to·most·recently·used.\n···*/\n··*rkeys()·{\n····for·(const·i·of·this.#rindexes())·{\n······const·k·=·this.#keyList[i]\n······if·(k·!==·undefined·&&·!this.#isBackgroundFetch(this.#valList[i]))·{\n········yield·k\n······}\n····}\n··}\n\n··/**\n···*·Return·a·generator·yielding·the·values·in·the·cache,\n···*·in·order·from·most·recently·used·to·least·recently·used.\n···*/\n··*values()·{\n····for·(const·i·of·this.#indexes())·{\n······const·v·=·this.#valList[i]\n······if·(v·!==·undefined·&&·!this.#isBackgroundFetch(this.#valList[i]))·{\n········yield·this.#valList[i]·as·V\n······}\n····}\n··}\n\n··/**\n···*·Inverse·order·version·of·{@link·LRUCache.values}\n···*\n···*·Return·a·generator·yielding·the·values·in·the·cache,\n···*·in·order·from·least·recently·used·to·most·recently·used.\n···*/\n··*rvalues()·{\n····for·(const·i·of·this.#rindexes())·{\n······const·v·=·this.#valList[i]\n······if·(v·!==·undefined·&&·!this.#isBackgroundFetch(this.#valList[i]))·{\n········yield·this.#valList[i]\n······}\n····}\n··}\n\n··/**\n···*·Iterating·over·the·cache·itself·yields·the·same·results·as\n···*·{@link·LRUCache.entries}\n···*/\n··[Symbol.iterator]()·{\n····return·this.entries()\n··}\n\n··/**\n···*·A·String·value·that·is·used·in·the·creation·of·the·default·string\n···*·description·of·an·object.·Called·by·the·built-in·method\n···*·`Object.prototype.toString`.\n···*/\n··[Symbol.toStringTag]·=·'LRUCache'\n\n··/**\n···*·Find·a·value·for·which·the·supplied·fn·method·returns·a·truthy·value,\n···*·similar·to·`Array.find()`.·fn·is·called·as·`fn(value,·key,·cache)`.\n···*/\n··find(\n····fn:·(v:·V,·k:·K,·self:·LRUCache<K,·V,·FC>)·=>·boolean,\n····getOptions:·LRUCache.GetOptions<K,·V,·FC>·=·{},\n··)·{\n····for·(const·i·of·this.#indexes())·{\n······const·v·=·this.#valList[i]\n······const·value·=·this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n······if·(value·===·undefined)·continue\n······if·(fn(value,·this.#keyList[i]·as·K,·this))·{\n········return·this.#get(this.#keyList[i]·as·K,·getOptions)\n······}\n····}\n··}\n\n··/**\n···*·Call·the·supplied·function·on·each·item·in·the·cache,·in·order·from·most\n···*·recently·used·to·least·recently·used.\n···*\n···*·`fn`·is·called·as·`fn(value,·key,·cache)`.\n···*\n···*·If·`thisp`·is·provided,·function·will·be·called·in·the·`this`-context·of\n···*·the·provided·object,·or·the·cache·if·no·`thisp`·object·is·provided.\n···*\n···*·Does·not·update·age·or·recenty·of·use,·or·iterate·over·stale·values.\n···*/\n··forEach(\n····fn:·(v:·V,·k:·K,·self:·LRUCache<K,·V,·FC>)·=>·unknown,\n····thisp:·unknown·=·this,\n··)·{\n····for·(const·i·of·this.#indexes())·{\n······const·v·=·this.#valList[i]\n······const·value·=·this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n······if·(value·===·undefined)·continue\n······fn.call(thisp,·value,·this.#keyList[i]·as·K,·this)\n····}\n··}\n\n··/**\n···*·The·same·as·{@link·LRUCache.forEach}·but·items·are·iterated·over·in\n···*·reverse·order.··(ie,·less·recently·used·items·are·iterated·over·first.)\n···*/\n··rforEach(\n····fn:·(v:·V,·k:·K,·self:·LRUCache<K,·V,·FC>)·=>·unknown,\n····thisp:·unknown·=·this,\n··)·{\n····for·(const·i·of·this.#rindexes())·{\n······const·v·=·this.#valList[i]\n······const·value·=·this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n······if·(value·===·undefined)·continue\n······fn.call(thisp,·value,·this.#keyList[i]·as·K,·this)\n····}\n··}\n\n··/**\n···*·Delete·any·stale·entries.·Returns·true·if·anything·was·removed,\n···*·false·otherwise.\n···*/\n··purgeStale()·{\n····let·deleted·=·false\n····for·(const·i·of·this.#rindexes({·allowStale:·true·}))·{\n······if·(this.#isStale(i))·{\n········this.#delete(this.#keyList[i]·as·K,·'expire')\n········deleted·=·true\n······}\n····}\n····return·deleted\n··}\n\n··/**\n···*·Get·the·extended·info·about·a·given·entry,·to·get·its·value,·size,·and\n···*·TTL·info·simultaneously.·Returns·`undefined`·if·the·key·is·not·present.\n···*\n···*·Unlike·{@link·LRUCache#dump},·which·is·designed·to·be·portable·and·survive\n···*·serialization,·the·`start`·value·is·always·the·current·timestamp,·and·the\n···*·`ttl`·is·a·calculated·remaining·time·to·live·(negative·if·expired).\n···*\n···*·Always·returns·stale·values,·if·their·info·is·found·in·the·cache,·so·be\n···*·sure·to·check·for·expirations·(ie,·a·negative·{@link·LRUCache.Entry#ttl})\n···*·if·relevant.\n···*/\n··info(key:·K):·LRUCache.Entry<V>·|·undefined·{\n····const·i·=·this.#keyMap.get(key)\n····if·(i·===·undefined)·return·undefined\n····const·v·=·this.#valList[i]\n····/*·c8·ignore·start·-·this·isn't·tested·for·the·info·function,\n·····*·but·it's·the·same·logic·as·found·in·other·places.·*/\n····const·value:·V·|·undefined·=\n······this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n····if·(value·===·undefined)·return·undefined\n····/*·c8·ignore·stop·*/\n····const·entry:·LRUCache.Entry<V>·=·{·value·}\n····if·(this.#ttls·&&·this.#starts)·{\n······const·ttl·=·this.#ttls[i]\n······const·start·=·this.#starts[i]\n······if·(ttl·&&·start)·{\n········const·remain·=·ttl·-·(this.#perf.now()·-·start)\n········entry.ttl·=·remain\n········entry.start·=·Date.now()\n······}\n····}\n····if·(this.#sizes)·{\n······entry.size·=·this.#sizes[i]\n····}\n····return·entry\n··}\n\n··/**\n···*·Return·an·array·of·[key,·{@link·LRUCache.Entry}]·tuples·which·can·be\n···*·passed·to·{@link·LRUCache#load}.\n···*\n···*·The·`start`·fields·are·calculated·relative·to·a·portable·`Date.now()`\n···*·timestamp,·even·if·`performance.now()`·is·available.\n···*\n···*·Stale·entries·are·always·included·in·the·`dump`,·even·if\n···*·{@link·LRUCache.OptionsBase.allowStale}·is·false.\n···*\n···*·Note:·this·returns·an·actual·array,·not·a·generator,·so·it·can·be·more\n···*·easily·passed·around.\n···*/\n··dump()·{\n····const·arr:·[K,·LRUCache.Entry<V>][]·=·[]\n····for·(const·i·of·this.#indexes({·allowStale:·true·}))·{\n······const·key·=·this.#keyList[i]\n······const·v·=·this.#valList[i]\n······const·value:·V·|·undefined·=\n········this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n······if·(value·===·undefined·||·key·===·undefined)·continue\n······const·entry:·LRUCache.Entry<V>·=·{·value·}\n······if·(this.#ttls·&&·this.#starts)·{\n········entry.ttl·=·this.#ttls[i]\n········//·always·dump·the·start·relative·to·a·portable·timestamp\n········//·it's·ok·for·this·to·be·a·bit·slow,·it's·a·rare·operation.\n········const·age·=·this.#perf.now()·-·(this.#starts[i]·as·number)\n········entry.start·=·Math.floor(Date.now()·-·age)\n······}\n······if·(this.#sizes)·{\n········entry.size·=·this.#sizes[i]\n······}\n······arr.unshift([key,·entry])\n····}\n····return·arr\n··}\n\n··/**\n···*·Reset·the·cache·and·load·in·the·items·in·entries·in·the·order·listed.\n···*\n···*·The·shape·of·the·resulting·cache·may·be·different·if·the·same·options·are\n···*·not·used·in·both·caches.\n···*\n···*·The·`start`·fields·are·assumed·to·be·calculated·relative·to·a·portable\n···*·`Date.now()`·timestamp,·even·if·`performance.now()`·is·available.\n···*/\n··load(arr:·[K,·LRUCache.Entry<V>][])·{\n····this.clear()\n····for·(const·[key,·entry]·of·arr)·{\n······if·(entry.start)·{\n········//·entry.start·is·a·portable·timestamp,·but·we·may·be·using\n········//·node's·performance.now(),·so·calculate·the·offset,·so·that\n········//·we·get·the·intended·remaining·TTL,·no·matter·how·long·it's\n········//·been·on·ice.\n········//\n········//·it's·ok·for·this·to·be·a·bit·slow,·it's·a·rare·operation.\n········const·age·=·Date.now()·-·entry.start\n········entry.start·=·this.#perf.now()·-·age\n······}\n······this.#set(key,·entry.value,·entry)\n····}\n··}\n\n··/**\n···*·Add·a·value·to·the·cache.\n···*\n···*·Note:·if·`undefined`·is·specified·as·a·value,·this·is·an·alias·for\n···*·{@link·LRUCache#delete}\n···*\n···*·Fields·on·the·{@link·LRUCache.SetOptions}·options·param·will·override\n···*·their·corresponding·values·in·the·constructor·options·for·the·scope\n···*·of·this·single·`set()`·operation.\n···*\n···*·If·`start`·is·provided,·then·that·will·set·the·effective·start\n···*·time·for·the·TTL·calculation.·Note·that·this·must·be·a·previous\n···*·value·of·`performance.now()`·if·supported,·or·a·previous·value·of\n···*·`Date.now()`·if·not.\n···*\n···*·Options·object·may·also·include·`size`,·which·will·prevent\n···*·calling·the·`sizeCalculation`·function·and·just·use·the·specified\n···*·number·if·it·is·a·positive·integer,·and·`noDisposeOnSet`·which\n···*·will·prevent·calling·a·`dispose`·function·in·the·case·of\n···*·overwrites.\n···*\n···*·If·the·`size`·(or·return·value·of·`sizeCalculation`)·for·a·given\n···*·entry·is·greater·than·`maxEntrySize`,·then·the·item·will·not·be\n···*·added·to·the·cache.\n···*\n···*·Will·update·the·recency·of·the·entry.\n···*\n···*·If·the·value·is·`undefined`,·then·this·is·an·alias·for\n···*·`cache.delete(key)`.·`undefined`·is·never·stored·in·the·cache.\n···*/\n··set(\n····k:·K,\n····v:·V·|·undefined,\n····setOptions:·LRUCache.SetOptions<K,·V,·FC>·=·{},\n··)·{\n····const·{·status·=·metrics.hasSubscribers·?·{}·:·undefined·}·=·setOptions\n····setOptions.status·=·status\n····if·(status)·{\n······status.op·=·'set'\n······status.key·=·k\n······if·(v·!==·undefined)·status.value·=·v\n····}\n····const·result·=·this.#set(k,·v,·setOptions)\n····if·(status·&&·metrics.hasSubscribers)·{\n······metrics.publish(status)\n····}\n····return·result\n··}\n\n··#set(\n····k:·K,\n····v:·V·|·BackgroundFetch<V>·|·undefined,\n····setOptions:·LRUCache.SetOptions<K,·V,·FC>·=·{},\n··)·{\n····const·{\n······ttl·=·this.ttl,\n······start,\n······noDisposeOnSet·=·this.noDisposeOnSet,\n······sizeCalculation·=·this.sizeCalculation,\n······status,\n····}·=·setOptions\n\n····if·(v·===·undefined)·{\n······if·(status)·status.set·=·'deleted'\n······this.delete(k)\n······return·this\n····}\n····let·{·noUpdateTTL·=·this.noUpdateTTL·}·=·setOptions\n\n····if·(status·&&·!this.#isBackgroundFetch(v))·status.value·=·v\n\n····const·size·=·this.#requireSize(\n······k,\n······v,\n······setOptions.size·||·0,\n······sizeCalculation,\n······status,\n····)\n····//·if·the·item·doesn't·fit,·don't·do·anything\n····//·NB:·maxEntrySize·set·to·maxSize·by·default\n····if·(this.maxEntrySize·&&·size·>·this.maxEntrySize)·{\n······//·have·to·delete,·in·case·something·is·there·already.\n······this.#delete(k,·'set')\n······if·(status)·{\n········status.set·=·'miss'\n········status.maxEntrySizeExceeded·=·true\n······}\n······return·this\n····}\n····let·index·=·this.#size·===·0·?·undefined·:·this.#keyMap.get(k)\n····if·(index·===·undefined)·{\n······//·addition\n······index·=·(\n········this.#size·===·0·?·this.#tail\n········:·this.#free.length·!==·0·?·this.#free.pop()\n········:·this.#size·===·this.#max·?·this.#evict(false)\n········:·this.#size)·as·Index\n······this.#keyList[index]·=·k\n······this.#valList[index]·=·v\n······this.#keyMap.set(k,·index)\n······this.#next[this.#tail]·=·index\n······this.#prev[index]·=·this.#tail\n······this.#tail·=·index\n······this.#size++\n······this.#addItemSize(index,·size,·status)\n······if·(status)·status.set·=·'add'\n······noUpdateTTL·=·false\n······if·(this.#hasOnInsert)·{\n········this.#onInsert?.(v·as·V,·k,·'add')\n······}\n····}·else·{\n······//·update\n······this.#moveToTail(index)\n······const·oldVal·=·this.#valList[index]·as·V·|·BackgroundFetch<V>\n······if·(v·!==·oldVal)·{\n········if·(this.#hasFetchMethod·&&·this.#isBackgroundFetch(oldVal))·{\n··········oldVal.__abortController.abort(new·Error('replaced'))\n··········const·{·__staleWhileFetching:·s·}·=·oldVal\n··········if·(s·!==·undefined·&&·!noDisposeOnSet)·{\n············if·(this.#hasDispose)·{\n··············this.#dispose?.(s·as·V,·k,·'set')\n············}\n············if·(this.#hasDisposeAfter)·{\n··············this.#disposed?.push([s·as·V,·k,·'set'])\n············}\n··········}\n········}·else·if·(!noDisposeOnSet)·{\n··········if·(this.#hasDispose)·{\n············this.#dispose?.(oldVal·as·V,·k,·'set')\n··········}\n··········if·(this.#hasDisposeAfter)·{\n············this.#disposed?.push([oldVal·as·V,·k,·'set'])\n··········}\n········}\n········this.#removeItemSize(index)\n········this.#addItemSize(index,·size,·status)\n········this.#valList[index]·=·v\n········if·(status)·{\n··········status.set·=·'replace'\n··········const·oldValue·=\n············oldVal·&&·this.#isBackgroundFetch(oldVal)·?\n··············oldVal.__staleWhileFetching\n············:·oldVal\n··········if·(oldValue·!==·undefined)·status.oldValue·=·oldValue\n········}\n······}·else·if·(status)·{\n········status.set·=·'update'\n······}\n\n······if·(this.#hasOnInsert)·{\n········this.onInsert?.(v·as·V,·k,·v·===·oldVal·?·'update'·:·'replace')\n······}\n····}\n····if·(ttl·!==·0·&&·!this.#ttls)·{\n······this.#initializeTTLTracking()\n····}\n····if·(this.#ttls)·{\n······if·(!noUpdateTTL)·{\n········this.#setItemTTL(index,·ttl,·start)\n······}\n······if·(status)·this.#statusTTL(status,·index)\n····}\n····if·(!noDisposeOnSet·&&·this.#hasDisposeAfter·&&·this.#disposed)·{\n······const·dt·=·this.#disposed\n······let·task:·DisposeTask<K,·V>·|·undefined\n······while·((task·=·dt?.shift()))·{\n········this.#disposeAfter?.(...task)\n······}\n····}\n····return·this\n··}\n\n··/**\n···*·Evict·the·least·recently·used·item,·returning·its·value·or\n···*·`undefined`·if·cache·is·empty.\n···*/\n··pop():·V·|·undefined·{\n····try·{\n······while·(this.#size)·{\n········const·val·=·this.#valList[this.#head]\n········this.#evict(true)\n········if·(this.#isBackgroundFetch(val))·{\n··········if·(val.__staleWhileFetching)·{\n············return·val.__staleWhileFetching\n··········}\n········}·else·if·(val·!==·undefined)·{\n··········return·val\n········}\n······}\n····}·finally·{\n······if·(this.#hasDisposeAfter·&&·this.#disposed)·{\n········const·dt·=·this.#disposed\n········let·task:·DisposeTask<K,·V>·|·undefined\n········while·((task·=·dt?.shift()))·{\n··········this.#disposeAfter?.(...task)\n········}\n······}\n····}\n··}\n\n··#evict(free:·boolean)·{\n····const·head·=·this.#head\n····const·k·=·this.#keyList[head]·as·K\n····const·v·=·this.#valList[head]·as·V\n····if·(this.#hasFetchMethod·&&·this.#isBackgroundFetch(v))·{\n······v.__abortController.abort(new·Error('evicted'))\n····}·else·if·(this.#hasDispose·||·this.#hasDisposeAfter)·{\n······if·(this.#hasDispose)·{\n········this.#dispose?.(v,·k,·'evict')\n······}\n······if·(this.#hasDisposeAfter)·{\n········this.#disposed?.push([v,·k,·'evict'])\n······}\n····}\n····this.#removeItemSize(head)\n····if·(this.#autopurgeTimers?.[head])·{\n······clearTimeout(this.#autopurgeTimers[head])\n······this.#autopurgeTimers[head]·=·undefined\n····}\n····//·if·we·aren't·about·to·use·the·index,·then·null·these·out\n····if·(free)·{\n······this.#keyList[head]·=·undefined\n······this.#valList[head]·=·undefined\n······this.#free.push(head)\n····}\n····if·(this.#size·===·1)·{\n······this.#head·=·this.#tail·=·0·as·Index\n······this.#free.length·=·0\n····}·else·{\n······this.#head·=·this.#next[head]·as·Index\n····}\n····this.#keyMap.delete(k)\n····this.#size--\n····return·head\n··}\n\n··/**\n···*·Check·if·a·key·is·in·the·cache,·without·updating·the·recency·of·use.\n···*·Will·return·false·if·the·item·is·stale,·even·though·it·is·technically\n···*·in·the·cache.\n···*\n···*·Check·if·a·key·is·in·the·cache,·without·updating·the·recency·of\n···*·use.·Age·is·updated·if·{@link·LRUCache.OptionsBase.updateAgeOnHas}·is·set\n···*·to·`true`·in·either·the·options·or·the·constructor.\n···*\n···*·Will·return·`false`·if·the·item·is·stale,·even·though·it·is·technically·in\n···*·the·cache.·The·difference·can·be·determined·(if·it·matters)·by·using·a\n···*·`status`·argument,·and·inspecting·the·`has`·field.\n···*\n···*·Will·not·update·item·age·unless\n···*·{@link·LRUCache.OptionsBase.updateAgeOnHas}·is·set.\n···*/\n··has(k:·K,·hasOptions:·LRUCache.HasOptions<K,·V,·FC>·=·{})·{\n····const·{·status·=·metrics.hasSubscribers·?·{}·:·undefined·}·=·hasOptions\n····hasOptions.status·=·status\n····if·(status)·{\n······status.op·=·'has'\n······status.key·=·k\n····}\n····const·result·=·this.#has(k,·hasOptions)\n····if·(metrics.hasSubscribers)·metrics.publish(status)\n····return·result\n··}\n··#has(k:·K,·hasOptions:·LRUCache.HasOptions<K,·V,·FC>·=·{})·{\n····const·{·updateAgeOnHas·=·this.updateAgeOnHas,·status·}·=·hasOptions\n····const·index·=·this.#keyMap.get(k)\n····if·(index·!==·undefined)·{\n······const·v·=·this.#valList[index]\n······if·(\n········this.#isBackgroundFetch(v)·&&\n········v.__staleWhileFetching·===·undefined\n······)·{\n········return·false\n······}\n······if·(!this.#isStale(index))·{\n········if·(updateAgeOnHas)·{\n··········this.#updateItemAge(index)\n········}\n········if·(status)·{\n··········status.has·=·'hit'\n··········this.#statusTTL(status,·index)\n········}\n········return·true\n······}·else·if·(status)·{\n········status.has·=·'stale'\n········this.#statusTTL(status,·index)\n······}\n····}·else·if·(status)·{\n······status.has·=·'miss'\n····}\n····return·false\n··}\n\n··/**\n···*·Like·{@link·LRUCache#get}·but·doesn't·update·recency·or·delete·stale\n···*·items.\n···*\n···*·Returns·`undefined`·if·the·item·is·stale,·unless\n···*·{@link·LRUCache.OptionsBase.allowStale}·is·set.\n···*/\n··peek(k:·K,·peekOptions:·LRUCache.PeekOptions<K,·V,·FC>·=·{})·{\n····const·{·status·=·hasSubscribers()·?·{}·:·undefined·}·=·peekOptions\n····if·(status)·{\n······status.op·=·'peek'\n······status.key·=·k\n····}\n····peekOptions.status·=·status\n····const·result·=·this.#peek(k,·peekOptions)\n····if·(metrics.hasSubscribers)·{\n······metrics.publish(status)\n····}\n····return·result\n··}\n··#peek(k:·K,·peekOptions:·LRUCache.PeekOptions<K,·V,·FC>)·{\n····const·{·status,·allowStale·=·this.allowStale·}·=·peekOptions\n····const·index·=·this.#keyMap.get(k)\n····if·(index·===·undefined·||·(!allowStale·&&·this.#isStale(index)))·{\n······if·(status)·status.peek·=·index·===·undefined·?·'miss'·:·'stale'\n······return·undefined\n····}\n····const·v·=·this.#valList[index]\n····const·val·=·this.#isBackgroundFetch(v)·?·v.__staleWhileFetching·:·v\n····if·(status)·{\n······if·(val·!==·undefined)·{\n········status.peek·=·'hit'\n········status.value·=·val\n······}·else·{\n········status.peek·=·'miss'\n······}\n····}\n····return·val\n··}\n\n··#backgroundFetch(\n····k:·K,\n····index:·Index·|·undefined,\n····options:·LRUCache.FetchOptions<K,·V,·FC>,\n····context:·FC,\n··):·BackgroundFetch<V>·{\n····const·v·=·index·===·undefined·?·undefined·:·this.#valList[index]\n····if·(this.#isBackgroundFetch(v))·{\n······return·v\n····}\n\n····const·ac·=·new·AbortController()\n····const·{·signal·}·=·options\n····//·when/if·our·AC·signals,·then·stop·listening·to·theirs.\n····signal?.addEventListener('abort',·()·=>·ac.abort(signal.reason),·{\n······signal:·ac.signal,\n····})\n\n····const·fetchOpts·=·{\n······signal:·ac.signal,\n······options,\n······context,\n····}\n\n····const·cb·=·(v:·V·|·undefined,·updateCache·=·false):·V·|·undefined·=>·{\n······const·{·aborted·}·=·ac.signal\n······const·ignoreAbort·=·options.ignoreFetchAbort·&&·v·!==·undefined\n······const·proceed·=\n········options.ignoreFetchAbort·||\n········!!(options.allowStaleOnFetchAbort·&&·v·!==·undefined)\n······if·(options.status)·{\n········if·(aborted·&&·!updateCache)·{\n··········options.status.fetchAborted·=·true\n··········options.status.fetchError·=·ac.signal.reason\n··········if·(ignoreAbort)·options.status.fetchAbortIgnored·=·true\n········}·else·{\n··········options.status.fetchResolved·=·true\n········}\n······}\n······if·(aborted·&&·!ignoreAbort·&&·!updateCache)·{\n········return·fetchFail(ac.signal.reason,·proceed)\n······}\n······//·either·we·didn't·abort,·and·are·still·here,·or·we·did,·and·ignored\n······const·bf·=·p·as·BackgroundFetch<V>\n······//·if·nothing·else·has·been·written·there·but·we're·set·to·update·the\n······//·cache·and·ignore·the·abort,·or·if·it's·still·pending·on·this·specific\n······//·background·request,·then·write·it·to·the·cache.\n······const·vl·=·this.#valList[index·as·Index]\n······if·(vl·===·p·||·(vl·===·undefined·&&·ignoreAbort·&&·updateCache))·{\n········if·(v·===·undefined)·{\n··········if·(bf.__staleWhileFetching·!==·undefined)·{\n············this.#valList[index·as·Index]·=·bf.__staleWhileFetching\n··········}·else·{\n············this.#delete(k,·'fetch')\n··········}\n········}·else·{\n··········if·(options.status)·options.status.fetchUpdated·=·true\n··········this.#set(k,·v,·fetchOpts.options)\n········}\n······}\n······return·v\n····}\n\n····const·eb·=·(er:·unknown)·=>·{\n······if·(options.status)·{\n········options.status.fetchRejected·=·true\n········options.status.fetchError·=·er·as·Error\n······}\n······//·do·not·pass·go,·do·not·collect·$200\n······return·fetchFail(er,·false)\n····}\n\n····const·fetchFail·=·(er:·unknown,·proceed:·boolean):·V·|·undefined·=>·{\n······const·{·aborted·}·=·ac.signal\n······const·allowStaleAborted·=·aborted·&&·options.allowStaleOnFetchAbort\n······const·allowStale·=\n········allowStaleAborted·||·options.allowStaleOnFetchRejection\n······const·noDelete·=·allowStale·||·options.noDeleteOnFetchRejection\n······const·bf·=·p·as·BackgroundFetch<V>\n······if·(this.#valList[index·as·Index]·===·p)·{\n········//·if·we·allow·stale·on·fetch·rejections,·then·we·need·to·ensure·that\n········//·the·stale·value·is·not·removed·from·the·cache·when·the·fetch·fails.\n········const·del·=\n··········!noDelete·||·(!proceed·&&·bf.__staleWhileFetching·===·undefined)\n········if·(del)·{\n··········this.#delete(k,·'fetch')\n········}·else·if·(!allowStaleAborted)·{\n··········//·still·replace·the·*promise*·with·the·stale·value,\n··········//·since·we·are·done·with·the·promise·at·this·point.\n··········//·leave·it·untouched·if·we're·still·waiting·for·an\n··········//·aborted·background·fetch·that·hasn't·yet·returned.\n··········this.#valList[index·as·Index]·=·bf.__staleWhileFetching\n········}\n······}\n······if·(allowStale)·{\n········if·(options.status·&&·bf.__staleWhileFetching·!==·undefined)·{\n··········options.status.returnedStale·=·true\n········}\n········return·bf.__staleWhileFetching\n······}·else·if·(bf.__returned·===·bf)·{\n········throw·er\n······}\n····}\n\n····const·pcall·=·(\n······res:·(v:·V·|·undefined)·=>·void,\n······rej:·(e:·unknown)·=>·void,\n····)·=>·{\n······const·fmp·=·this.#fetchMethod?.(k,·v,·fetchOpts)\n······if·(fmp·&&·fmp·instanceof·Promise)·{\n········fmp.then(v·=>·res(v·===·undefined·?·undefined·:·v),·rej)\n······}\n······//·ignored,·we·go·until·we·finish,·regardless.\n······//·defer·check·until·we·are·actually·aborting,\n······//·so·fetchMethod·can·override.\n······ac.signal.addEventListener('abort',·()·=>·{\n········if·(!options.ignoreFetchAbort·||·options.allowStaleOnFetchAbort)·{\n··········res(undefined)\n··········//·when·it·eventually·resolves,·update·the·cache.\n··········if·(options.allowStaleOnFetchAbort)·{\n············res·=·v·=>·cb(v,·true)\n··········}\n········}\n······})\n····}\n\n····if·(options.status)·options.status.fetchDispatched·=·true\n····const·p·=·new·Promise(pcall).then(cb,·eb)\n····const·bf:·BackgroundFetch<V>·=·Object.assign(p,·{\n······__abortController:·ac,\n······__staleWhileFetching:·v,\n······__returned:·undefined,\n····})\n\n····if·(index·===·undefined)·{\n······//·internal,·don't·expose·status.\n······this.#set(k,·bf,·{·...fetchOpts.options,·status:·undefined·})\n······index·=·this.#keyMap.get(k)\n····}·else·{\n······this.#valList[index]·=·bf\n····}\n····return·bf\n··}\n\n··#isBackgroundFetch(p:·unknown):·p·is·BackgroundFetch<V>·{\n····if·(!this.#hasFetchMethod)·return·false\n····const·b·=·p·as·BackgroundFetch<V>\n····return·(\n······!!b·&&\n······b·instanceof·Promise·&&\n······b.hasOwnProperty('__staleWhileFetching')·&&\n······b.__abortController·instanceof·AbortController\n····)\n··}\n\n··/**\n···*·Make·an·asynchronous·cached·fetch·using·the\n···*·{@link·LRUCache.OptionsBase.fetchMethod}·function.\n···*\n···*·If·the·value·is·in·the·cache·and·not·stale,·then·the·returned\n···*·Promise·resolves·to·the·value.\n···*\n···*·If·not·in·the·cache,·or·beyond·its·TTL·staleness,·then\n···*·`fetchMethod(key,·staleValue,·{·options,·signal,·context·})`·is\n···*·called,·and·the·value·returned·will·be·added·to·the·cache·once\n···*·resolved.\n···*\n···*·If·called·with·`allowStale`,·and·an·asynchronous·fetch·is\n···*·currently·in·progress·to·reload·a·stale·value,·then·the·former\n···*·stale·value·will·be·returned.\n···*\n···*·If·called·with·`forceRefresh`,·then·the·cached·item·will·be\n···*·re-fetched,·even·if·it·is·not·stale.·However,·if·`allowStale`·is·also\n···*·set,·then·the·old·value·will·still·be·returned.·This·is·useful\n···*·in·cases·where·you·want·to·force·a·reload·of·a·cached·value.·If\n···*·a·background·fetch·is·already·in·progress,·then·`forceRefresh`\n···*·has·no·effect.\n···*\n···*·If·multiple·fetches·for·the·same·key·are·issued,·then·they·will·all·be\n···*·coalesced·into·a·single·call·to·fetchMethod.\n···*\n···*·Note·that·this·means·that·handling·options·such·as\n···*·{@link·LRUCache.OptionsBase.allowStaleOnFetchAbort},\n···*·{@link·LRUCache.FetchOptions.signal},\n···*·and·{@link·LRUCache.OptionsBase.allowStaleOnFetchRejection}·will·be\n···*·determined·by·the·FIRST·fetch()·call·for·a·given·key.\n···*\n···*·This·is·a·known·(fixable)·shortcoming·which·will·be·addresed·on·when\n···*·someone·complains·about·it,·as·the·fix·would·involve·added·complexity·and\n···*·may·not·be·worth·the·costs·for·this·edge·case.\n···*\n···*·If·{@link·LRUCache.OptionsBase.fetchMethod}·is·not·specified,·then·this·is\n···*·effectively·an·alias·for·`Promise.resolve(cache.get(key))`.\n···*\n···*·When·the·fetch·method·resolves·to·a·value,·if·the·fetch·has·not\n···*·been·aborted·due·to·deletion,·eviction,·or·being·overwritten,\n···*·then·it·is·added·to·the·cache·using·the·options·provided.\n···*\n···*·If·the·key·is·evicted·or·deleted·before·the·`fetchMethod`\n···*·resolves,·then·the·AbortSignal·passed·to·the·`fetchMethod`·will\n···*·receive·an·`abort`·event,·and·the·promise·returned·by·`fetch()`\n···*·will·reject·with·the·reason·for·the·abort.\n···*\n···*·If·a·`signal`·is·passed·to·the·`fetch()`·call,·then·aborting·the\n···*·signal·will·abort·the·fetch·and·cause·the·`fetch()`·promise·to\n···*·reject·with·the·reason·provided.\n···*\n···*·**Setting·`context`**\n···*\n···*·If·an·`FC`·type·is·set·to·a·type·other·than·`unknown`,·`void`,·or\n···*·`undefined`·in·the·{@link·LRUCache}·constructor,·then·all\n···*·calls·to·`cache.fetch()`·_must_·provide·a·`context`·option.·If\n···*·set·to·`undefined`·or·`void`,·then·calls·to·fetch·_must·not_\n···*·provide·a·`context`·option.\n···*\n···*·The·`context`·param·allows·you·to·provide·arbitrary·data·that\n···*·might·be·relevant·in·the·course·of·fetching·the·data.·It·is·only\n···*·relevant·for·the·course·of·a·single·`fetch()`·operation,·and\n···*·discarded·afterwards.\n···*\n···*·**Note:·`fetch()`·calls·are·inflight-unique**\n···*\n···*·If·you·call·`fetch()`·multiple·times·with·the·same·key·value,\n···*·then·every·call·after·the·first·will·resolve·on·the·same\n···*·promise<sup>1</sup>,\n···*·_even·if·they·have·different·settings·that·would·otherwise·change\n···*·the·behavior·of·the·fetch_,·such·as·`noDeleteOnFetchRejection`\n···*·or·`ignoreFetchAbort`.\n···*\n···*·In·most·cases,·this·is·not·a·problem·(in·fact,·only·fetching\n···*·something·once·is·what·you·probably·want,·if·you're·caching·in\n···*·the·first·place).·If·you·are·changing·the·fetch()·options\n···*·dramatically·between·runs,·there's·a·good·chance·that·you·might\n···*·be·trying·to·fit·divergent·semantics·into·a·single·object,·and\n···*·would·be·better·off·with·multiple·cache·instances.\n···*\n···*·**1**:·Ie,·they're·not·the·\"same·Promise\",·but·they·resolve·at\n···*·the·same·time,·because·they're·both·waiting·on·the·same\n···*·underlying·fetchMethod·response.\n···*/\n\n··fetch(\n····k:·K,\n····fetchOptions:·unknown·extends·FC·?·LRUCache.FetchOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.FetchOptionsNoContext<K,·V>\n····:·LRUCache.FetchOptionsWithContext<K,·V,·FC>,\n··):·Promise<undefined·|·V>\n\n··//·this·overload·not·allowed·if·context·is·required\n··fetch(\n····k:·unknown·extends·FC·?·K\n····:·FC·extends·undefined·|·void·?·K\n····:·never,\n····fetchOptions?:·unknown·extends·FC·?·LRUCache.FetchOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.FetchOptionsNoContext<K,·V>\n····:·never,\n··):·Promise<undefined·|·V>\n··fetch(\n····k:·K,\n····fetchOptions:·LRUCache.FetchOptions<K,·V,·FC>·=·{},\n··):·Promise<undefined·|·V>·{\n····const·ths·=·tracing.hasSubscribers\n····const·{·status·=·hasSubscribers()·?·{}·:·undefined·}·=·fetchOptions\n····fetchOptions.status·=·status\n····if·(status·&&·fetchOptions.context)·{\n······status.context·=·fetchOptions.context\n····}\n····const·p·=·this.#fetch(k,·fetchOptions)\n····if·(status·&&·hasSubscribers())·{\n······if·(ths)·{\n········status.trace·=·true\n········tracing.tracePromise(()·=>·p,·status).catch(()·=>·{})\n······}\n····}\n····return·p\n··}\n\n··async·#fetch(\n····k:·K,\n····fetchOptions:·LRUCache.FetchOptions<K,·V,·FC>·=·{},\n··):·Promise<undefined·|·V>·{\n····const·{\n······//·get·options\n······allowStale·=·this.allowStale,\n······updateAgeOnGet·=·this.updateAgeOnGet,\n······noDeleteOnStaleGet·=·this.noDeleteOnStaleGet,\n······//·set·options\n······ttl·=·this.ttl,\n······noDisposeOnSet·=·this.noDisposeOnSet,\n······size·=·0,\n······sizeCalculation·=·this.sizeCalculation,\n······noUpdateTTL·=·this.noUpdateTTL,\n······//·fetch·exclusive·options\n······noDeleteOnFetchRejection·=·this.noDeleteOnFetchRejection,\n······allowStaleOnFetchRejection·=·this.allowStaleOnFetchRejection,\n······ignoreFetchAbort·=·this.ignoreFetchAbort,\n······allowStaleOnFetchAbort·=·this.allowStaleOnFetchAbort,\n······context,\n······forceRefresh·=·false,\n······status,\n······signal,\n····}·=·fetchOptions\n····if·(status)·{\n······status.op·=·'fetch'\n······status.key·=·k\n······if·(forceRefresh)·status.forceRefresh·=·true\n····}\n\n····if·(!this.#hasFetchMethod)·{\n······if·(status)·status.fetch·=·'get'\n······return·this.#get(k,·{\n········allowStale,\n········updateAgeOnGet,\n········noDeleteOnStaleGet,\n········status,\n······})\n····}\n\n····const·options·=·{\n······allowStale,\n······updateAgeOnGet,\n······noDeleteOnStaleGet,\n······ttl,\n······noDisposeOnSet,\n······size,\n······sizeCalculation,\n······noUpdateTTL,\n······noDeleteOnFetchRejection,\n······allowStaleOnFetchRejection,\n······allowStaleOnFetchAbort,\n······ignoreFetchAbort,\n······status,\n······signal,\n····}\n\n····let·index·=·this.#keyMap.get(k)\n····if·(index·===·undefined)·{\n······if·(status)·status.fetch·=·'miss'\n······const·p·=·this.#backgroundFetch(k,·index,·options,·context·as·FC)\n······return·(p.__returned·=·p)\n····}·else·{\n······//·in·cache,·maybe·already·fetching\n······const·v·=·this.#valList[index]\n······if·(this.#isBackgroundFetch(v))·{\n········const·stale·=·allowStale·&&·v.__staleWhileFetching·!==·undefined\n········if·(status)·{\n··········status.fetch·=·'inflight'\n··········if·(stale)·status.returnedStale·=·true\n········}\n········return·stale·?·v.__staleWhileFetching·:·(v.__returned·=·v)\n······}\n\n······//·if·we·force·a·refresh,·that·means·do·NOT·serve·the·cached·value,\n······//·unless·we·are·already·in·the·process·of·refreshing·the·cache.\n······const·isStale·=·this.#isStale(index)\n······if·(!forceRefresh·&&·!isStale)·{\n········if·(status)·status.fetch·=·'hit'\n········this.#moveToTail(index)\n········if·(updateAgeOnGet)·{\n··········this.#updateItemAge(index)\n········}\n········if·(status)·this.#statusTTL(status,·index)\n········return·v\n······}\n\n······//·ok,·it·is·stale·or·a·forced·refresh,·and·not·already·fetching.\n······//·refresh·the·cache.\n······const·p·=·this.#backgroundFetch(k,·index,·options,·context·as·FC)\n······const·hasStale·=·p.__staleWhileFetching·!==·undefined\n······const·staleVal·=·hasStale·&&·allowStale\n······if·(status)·{\n········status.fetch·=·isStale·?·'stale'·:·'refresh'\n········if·(staleVal·&&·isStale)·status.returnedStale·=·true\n······}\n······return·staleVal·?·p.__staleWhileFetching·:·(p.__returned·=·p)\n····}\n··}\n\n··/**\n···*·In·some·cases,·`cache.fetch()`·may·resolve·to·`undefined`,·either·because\n···*·a·{@link·LRUCache.OptionsBase#fetchMethod}·was·not·provided·(turning\n···*·`cache.fetch(k)`·into·just·an·async·wrapper·around·`cache.get(k)`)·or\n···*·because·`ignoreFetchAbort`·was·specified·(either·to·the·constructor·or\n···*·in·the·{@link·LRUCache.FetchOptions}).·Also,·the\n···*·{@link·LRUCache.OptionsBase.fetchMethod}·may·return·`undefined`·or·`void`,·making\n···*·the·test·even·more·complicated.\n···*\n···*·Because·inferring·the·cases·where·`undefined`·might·be·returned·are·so\n···*·cumbersome,·but·testing·for·`undefined`·can·also·be·annoying,·this·method\n···*·can·be·used,·which·will·reject·if·`this.fetch()`·resolves·to·undefined.\n···*/\n··forceFetch(\n····k:·K,\n····fetchOptions:·unknown·extends·FC·?·LRUCache.FetchOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.FetchOptionsNoContext<K,·V>\n····:·LRUCache.FetchOptionsWithContext<K,·V,·FC>,\n··):·Promise<V>\n··//·this·overload·not·allowed·if·context·is·required\n··forceFetch(\n····k:·unknown·extends·FC·?·K\n····:·FC·extends·undefined·|·void·?·K\n····:·never,\n····fetchOptions?:·unknown·extends·FC·?·LRUCache.FetchOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.FetchOptionsNoContext<K,·V>\n····:·never,\n··):·Promise<V>\n··forceFetch(\n····k:·K,\n····fetchOptions:·LRUCache.FetchOptions<K,·V,·FC>·=·{},\n··):·Promise<V>·{\n····const·ths·=·tracing.hasSubscribers\n····const·{·status·=·hasSubscribers()·?·{}·:·undefined·}·=·fetchOptions\n····fetchOptions.status·=·status\n····if·(status·&&·fetchOptions.context)·{\n······status.context·=·fetchOptions.context\n····}\n····const·p·=·this.#forceFetch(k,·fetchOptions)\n····if·(status·&&·hasSubscribers())·{\n······if·(ths)·{\n········status.trace·=·true\n········tracing.tracePromise(()·=>·p,·status).catch(()·=>·{})\n······}\n····}\n····return·p\n··}\n\n··async·#forceFetch(\n····k:·K,\n····fetchOptions:·LRUCache.FetchOptions<K,·V,·FC>·=·{},\n··)·{\n····const·v·=·await·this.#fetch(\n······k,\n······fetchOptions·as·unknown·extends·FC·?·LRUCache.FetchOptions<K,·V,·FC>\n······:·FC·extends·undefined·|·void·?·LRUCache.FetchOptionsNoContext<K,·V>\n······:·LRUCache.FetchOptionsWithContext<K,·V,·FC>,\n····)\n····if·(v·===·undefined)·throw·new·Error('fetch()·returned·undefined')\n····return·v\n··}\n\n··/**\n···*·If·the·key·is·found·in·the·cache,·then·this·is·equivalent·to\n···*·{@link·LRUCache#get}.·If·not,·in·the·cache,·then·calculate·the·value·using\n···*·the·{@link·LRUCache.OptionsBase.memoMethod},·and·add·it·to·the·cache.\n···*\n···*·If·an·`FC`·type·is·set·to·a·type·other·than·`unknown`,·`void`,·or\n···*·`undefined`·in·the·LRUCache·constructor,·then·all·calls·to·`cache.memo()`\n···*·_must_·provide·a·`context`·option.·If·set·to·`undefined`·or·`void`,·then\n···*·calls·to·memo·_must·not_·provide·a·`context`·option.\n···*\n···*·The·`context`·param·allows·you·to·provide·arbitrary·data·that·might·be\n···*·relevant·in·the·course·of·fetching·the·data.·It·is·only·relevant·for·the\n···*·course·of·a·single·`memo()`·operation,·and·discarded·afterwards.\n···*/\n··memo(\n····k:·K,\n····memoOptions:·unknown·extends·FC·?·LRUCache.MemoOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.MemoOptionsNoContext<K,·V>\n····:·LRUCache.MemoOptionsWithContext<K,·V,·FC>,\n··):·V\n··//·this·overload·not·allowed·if·context·is·required\n··memo(\n····k:·unknown·extends·FC·?·K\n····:·FC·extends·undefined·|·void·?·K\n····:·never,\n····memoOptions?:·unknown·extends·FC·?·LRUCache.MemoOptions<K,·V,·FC>\n····:·FC·extends·undefined·|·void·?·LRUCache.MemoOptionsNoContext<K,·V>\n····:·never,\n··):·V\n··memo(k:·K,·memoOptions:·LRUCache.MemoOptions<K,·V,·FC>·=·{})·{\n····const·{·status·=·metrics.hasSubscribers·?·{}·:·undefined·}·=\n······memoOptions\n····memoOptions.status·=·status\n····if·(status)·{\n······status.op·=·'memo'\n······status.key·=·k\n······if·(memoOptions.context)·{\n········status.context·=·memoOptions.context\n······}\n····}\n····const·result·=·this.#memo(k,·memoOptions)\n····if·(status)·status.value·=·result\n····if·(metrics.hasSubscribers)·metrics.publish(status)\n····return·result\n··}\n··#memo(k:·K,·memoOptions:·LRUCache.MemoOptions<K,·V,·FC>·=·{})·{\n····const·memoMethod·=·this.#memoMethod\n····if·(!memoMethod)·{\n······throw·new·Error('no·memoMethod·provided·to·constructor')\n····}\n····const·{·context,·status,·forceRefresh,·...options·}·=·memoOptions\n····if·(status·&&·forceRefresh)·status.forceRefresh·=·true\n····const·v·=·this.#get(k,·options)\n····const·refresh·=·forceRefresh·||·v·===·undefined\n····if·(status)·{\n······status.memo·=·refresh·?·'miss'·:·'hit'\n······if·(!refresh)·status.value·=·v\n····}\n····if·(!refresh)·return·v\n····const·vv·=·memoMethod(k,·v,·{\n······options,\n······context,\n····}·as·LRUCache.MemoizerOptions<K,·V,·FC>)\n····if·(status)·status.value·=·vv\n····this.#set(k,·vv,·options)\n····return·vv\n··}\n\n··/**\n···*·Return·a·value·from·the·cache.·Will·update·the·recency·of·the·cache\n···*·entry·found.\n···*\n···*·If·the·key·is·not·found,·get()·will·return·`undefined`.\n···*/\n··get(k:·K,·getOptions:·LRUCache.GetOptions<K,·V,·FC>·=·{})·{\n····const·{·status·=·metrics.hasSubscribers·?·{}·:·undefined·}·=·getOptions\n····getOptions.status·=·status\n····if·(status)·{\n······status.op·=·'get'\n······status.key·=·k\n····}\n····const·result·=·this.#get(k,·getOptions)\n····if·(status)·{\n······if·(result·!==·undefined)·status.value·=·result\n······if·(metrics.hasSubscribers)·metrics.publish(status)\n····}\n····return·result\n··}\n\n··#get(k:·K,·getOptions:·LRUCache.GetOptions<K,·V,·FC>·=·{})·{\n····const·{\n······allowStale·=·this.allowStale,\n······updateAgeOnGet·=·this.updateAgeOnGet,\n······noDeleteOnStaleGet·=·this.noDeleteOnStaleGet,\n······status,\n····}·=·getOptions\n····const·index·=·this.#keyMap.get(k)\n····if·(index·===·undefined)·{\n······if·(status)·status.get·=·'miss'\n······return·undefined\n····}\n····const·value·=·this.#valList[index]\n····const·fetching·=·this.#isBackgroundFetch(value)\n····if·(status)·this.#statusTTL(status,·index)\n····if·(this.#isStale(index))·{\n······//·delete·only·if·not·an·in-flight·background·fetch\n······if·(!fetching)·{\n········if·(!noDeleteOnStaleGet)·{\n··········this.#delete(k,·'expire')\n········}\n········if·(status)·status.get·=·'stale'\n········if·(allowStale)·{\n··········if·(status)·status.returnedStale·=·true\n··········return·value\n········}\n········return·undefined\n······}\n······if·(status)·status.get·=·'stale-fetching'\n······if·(allowStale·&&·value.__staleWhileFetching·!==·undefined)·{\n········if·(status)·status.returnedStale·=·true\n········return·value.__staleWhileFetching\n······}\n······return·undefined\n····}\n····//·not·stale\n····if·(status)·status.get·=·fetching·?·'fetching'·:·'hit'\n····//·if·we're·currently·fetching·it,·we·don't·actually·have·it·yet\n····//·it's·not·stale,·which·means·this·isn't·a·staleWhileRefetching.\n····//·If·it's·not·stale,·and·fetching,·AND·has·a·__staleWhileFetching\n····//·value,·then·that·means·the·user·fetched·with·{forceRefresh:true},\n····//·so·it's·safe·to·return·that·value.\n····this.#moveToTail(index)\n····if·(updateAgeOnGet)·{\n······this.#updateItemAge(index)\n····}\n····return·fetching·?·value.__staleWhileFetching·:·value\n··}\n\n··#connect(p:·Index,·n:·Index)·{\n····this.#prev[n]·=·p\n····this.#next[p]·=·n\n··}\n\n··#moveToTail(index:·Index):·void·{\n····//·if·tail·already,·nothing·to·do\n····//·if·head,·move·head·to·next[index]\n····//·else\n····//···move·next[prev[index]]·to·next[index]·(head·has·no·prev)\n····//···move·prev[next[index]]·to·prev[index]\n····//·prev[index]·=·tail\n····//·next[tail]·=·index\n····//·tail·=·index\n····if·(index·!==·this.#tail)·{\n······if·(index·===·this.#head)·{\n········this.#head·=·this.#next[index]·as·Index\n······}·else·{\n········this.#connect(\n··········this.#prev[index]·as·Index,\n··········this.#next[index]·as·Index,\n········)\n······}\n······this.#connect(this.#tail,·index)\n······this.#tail·=·index\n····}\n··}\n\n··/**\n···*·Deletes·a·key·out·of·the·cache.\n···*\n···*·Returns·true·if·the·key·was·deleted,·false·otherwise.\n···*/\n··delete(k:·K)·{\n····return·this.#delete(k,·'delete')\n··}\n\n··#delete(k:·K,·reason:·LRUCache.DisposeReason)·{\n····if·(metrics.hasSubscribers)·{\n······metrics.publish({\n········op:·'delete',\n········delete:·reason,\n········key:·k,\n······})\n····}\n····let·deleted·=·false\n····if·(this.#size·!==·0)·{\n······const·index·=·this.#keyMap.get(k)\n······if·(index·!==·undefined)·{\n········if·(this.#autopurgeTimers?.[index])·{\n··········clearTimeout(this.#autopurgeTimers?.[index])\n··········this.#autopurgeTimers[index]·=·undefined\n········}\n········deleted·=·true\n········if·(this.#size·===·1)·{\n··········this.#clear(reason)\n········}·else·{\n··········this.#removeItemSize(index)\n··········const·v·=·this.#valList[index]\n··········if·(this.#isBackgroundFetch(v))·{\n············v.__abortController.abort(new·Error('deleted'))\n··········}·else·if·(this.#hasDispose·||·this.#hasDisposeAfter)·{\n············if·(this.#hasDispose)·{\n··············this.#dispose?.(v·as·V,·k,·reason)\n············}\n············if·(this.#hasDisposeAfter)·{\n··············this.#disposed?.push([v·as·V,·k,·reason])\n············}\n··········}\n··········this.#keyMap.delete(k)\n··········this.#keyList[index]·=·undefined\n··········this.#valList[index]·=·undefined\n··········if·(index·===·this.#tail)·{\n············this.#tail·=·this.#prev[index]·as·Index\n··········}·else·if·(index·===·this.#head)·{\n············this.#head·=·this.#next[index]·as·Index\n··········}·else·{\n············const·pi·=·this.#prev[index]·as·number\n············this.#next[pi]·=·this.#next[index]·as·number\n············const·ni·=·this.#next[index]·as·number\n············this.#prev[ni]·=·this.#prev[index]·as·number\n··········}\n··········this.#size--\n··········this.#free.push(index)\n········}\n······}\n····}\n····if·(this.#hasDisposeAfter·&&·this.#disposed?.length)·{\n······const·dt·=·this.#disposed\n······let·task:·DisposeTask<K,·V>·|·undefined\n······while·((task·=·dt?.shift()))·{\n········this.#disposeAfter?.(...task)\n······}\n····}\n····return·deleted\n··}\n\n··/**\n···*·Clear·the·cache·entirely,·throwing·away·all·values.\n···*/\n··clear()·{\n····return·this.#clear('delete')\n··}\n··#clear(reason:·LRUCache.DisposeReason)·{\n····for·(const·index·of·this.#rindexes({·allowStale:·true·}))·{\n······const·v·=·this.#valList[index]\n······if·(this.#isBackgroundFetch(v))·{\n········v.__abortController.abort(new·Error('deleted'))\n······}·else·{\n········const·k·=·this.#keyList[index]\n········if·(this.#hasDispose)·{\n··········this.#dispose?.(v·as·V,·k·as·K,·reason)\n········}\n········if·(this.#hasDisposeAfter)·{\n··········this.#disposed?.push([v·as·V,·k·as·K,·reason])\n········}\n······}\n····}\n\n····this.#keyMap.clear()\n····this.#valList.fill(undefined)\n····this.#keyList.fill(undefined)\n····if·(this.#ttls·&&·this.#starts)·{\n······this.#ttls.fill(0)\n······this.#starts.fill(0)\n······for·(const·t·of·this.#autopurgeTimers·??·[])·{\n········if·(t·!==·undefined)·clearTimeout(t)\n······}\n······this.#autopurgeTimers?.fill(undefined)\n····}\n····if·(this.#sizes)·{\n······this.#sizes.fill(0)\n····}\n····this.#head·=·0·as·Index\n····this.#tail·=·0·as·Index\n····this.#free.length·=·0\n····this.#calculatedSize·=·0\n····this.#size·=·0\n····if·(this.#hasDisposeAfter·&&·this.#disposed)·{\n······const·dt·=·this.#disposed\n······let·task:·DisposeTask<K,·V>·|·undefined\n······while·((task·=·dt?.shift()))·{\n········this.#disposeAfter?.(...task)\n······}\n····}\n··}\n}\n" |