| 1 | 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* @module LRUCache\n */\n\n// module-private names and types\ntype Perf = { now: () => number }\nconst perf: Perf =\n typeof performance === 'object' &&\n performance &&\n typeof performance.now === 'function'\n ? performance\n : Date\n\nconst warned = new Set<string>()\n\n// either a function or a class\ntype ForC = ((...a: any[]) => any) | { new (...a: any[]): any }\n\n/* c8 ignore start */\nconst PROCESS = (\n typeof process === 'object' && !!process ? process : {}\n) as { [k: string]: any }\n/* c8 ignore start */\n\nconst emitWarning = (\n msg: string,\n type: string,\n code: string,\n fn: ForC\n) => {\n typeof PROCESS.emitWarning === 'function'\n ? PROCESS.emitWarning(msg, type, code, fn)\n : console.error(`[${code}] ${type}: ${msg}`)\n}\n\nlet AC = globalThis.AbortController\nlet AS = globalThis.AbortSignal\n\n/* c8 ignore start */\nif (typeof AC === 'undefined') {\n //@ts-ignore\n AS = class AbortSignal {\n onabort?: (...a: any[]) => any\n _onabort: ((...a: any[]) => any)[] = []\n reason?: any\n aborted: boolean = false\n addEventListener(_: string, fn: (...a: any[]) => any) {\n this._onabort.push(fn)\n }\n }\n //@ts-ignore\n AC = class AbortController {\n constructor() {\n warnACPolyfill()\n }\n signal = new AS()\n abort(reason: any) {\n if (this.signal.aborted) return\n //@ts-ignore\n this.signal.reason = reason\n //@ts-ignore\n this.signal.aborted = true\n //@ts-ignore\n for (const fn of this.signal._onabort) {\n fn(reason)\n }\n this.signal.onabort?.(reason)\n }\n }\n let printACPolyfillWarning =\n PROCESS.env?.LRU_CACHE_IGNORE_AC_WARNING !== '1'\n const warnACPolyfill = () => {\n if (!printACPolyfillWarning) return\n printACPolyfillWarning = false\n emitWarning(\n 'AbortController is not defined. If using lru-cache in ' +\n 'node 14, load an AbortController polyfill from the ' +\n '`node-abort-controller` package. A minimal polyfill is ' +\n 'provided for use by LRUCache.fetch(), but it should not be ' +\n 'relied upon in other contexts (eg, passing it to other APIs that ' +\n 'use AbortController/AbortSignal might have undesirable effects). ' +\n 'You may disable this with LRU_CACHE_IGNORE_AC_WARNING=1 in the env.',\n 'NO_ABORT_CONTROLLER',\n 'ENOTSUP',\n warnACPolyfill\n )\n }\n}\n/* c8 ignore stop */\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: any): n is PosInt =>\n n && n === Math.floor(n) && n > 0 && isFinite(n)\n\nexport type UintArray = Uint8Array | Uint16Array | Uint32Array\nexport type NumberArray = UintArray | number[]\n\n/* c8 ignore start */\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.\nconst getUintArray = (max: number) =>\n !isPosInt(max)\n ? null\n : max <= Math.pow(2, 8)\n ? Uint8Array\n : max <= Math.pow(2, 16)\n ? Uint16Array\n : max <= Math.pow(2, 32)\n ? Uint32Array\n : max <= Number.MAX_SAFE_INTEGER\n ? 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(\n max: number,\n HeapCls: { new (n: number): NumberArray }\n ) {\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 export type DisposeReason = 'evict' | 'set' | 'delete'\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 * 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 * Status object that may be passed to {@link LRUCache#fetch},\n * {@link LRUCache#get}, {@link LRUCache#set}, and {@link LRUCache#has}.\n */\n export interface Status<V> {\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'\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 old value, specified in the case of `set:'update'` or\n * `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 fetchMethod, so {@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 * 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.\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.\n * - hit: the item is in the cache\n * - miss: the item is not in the cache\n */\n get?: 'stale' | 'hit' | 'miss'\n\n /**\n * A fetch or get operation returned a stale value.\n */\n returnedStale?: true\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>\n 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<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>\n extends FetcherFetchOptions<K, V, FC> {\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<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>\n extends FetchOptions<K, V, FC> {\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>\n extends FetchOptions<K, V, undefined> {\n context?: undefined\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#has} method.\n */\n export interface HasOptions<K, V, FC>\n extends Pick<OptionsBase<K, V, FC>, 'updateAgeOnHas'> {\n status?: Status<V>\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#get} method.\n */\n export interface GetOptions<K, V, FC>\n extends Pick<\n OptionsBase<K, V, FC>,\n 'allowStale' | 'updateAgeOnGet' | 'noDeleteOnStaleGet'\n > {\n status?: Status<V>\n }\n\n /**\n * Options that may be passed to the {@link LRUCache#peek} method.\n */\n export interface PeekOptions<K, V, FC>\n extends Pick<OptionsBase<K, V, FC>, 'allowStale'> {}\n\n /**\n * Options that may be passed to the {@link LRUCache#set} method.\n */\n export interface SetOptions<K, V, FC>\n 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<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 * 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 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 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\n * by default, and MAY live in the cache long after they have expired.\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 * Must be an integer number of ms. If set to 0, this indicates \"no TTL\"\n *\n * @default 0\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 * Note that this may significantly degrade performance,\n * especially if the cache is storing a large number of items.\n * It is almost always best to just leave the stale items in\n * the cache, and let them fall out as new 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 * @default false\n */\n ttlAutopurge?: boolean\n\n /**\n * Update the age of items on {@link LRUCache#get}, renewing their TTL\n *\n * Has no effect if {@link OptionsBase.ttl} is not set.\n *\n * @default false\n */\n updateAgeOnGet?: boolean\n\n /**\n * Update the age of items on {@link LRUCache#has}, renewing their TTL\n *\n * Has no effect if {@link OptionsBase.ttl} is not set.\n *\n * @default false\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 allowStale?: boolean\n\n /**\n * Function that is called on items when they are dropped from the cache.\n * This can be handy if you want to close file descriptors or do other\n * cleanup tasks when items are no longer accessible. Called with `key,\n * value`. It's called before actually removing the item from the\n * internal cache, so it is *NOT* safe to re-add them.\n *\n * Use {@link OptionsBase.disposeAfter} if you wish to dispose items after\n * they have been full removed, when it is safe to add them back to the\n * cache.\n */\n dispose?: Disposer<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 * 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 * This may be overridden by passing an options object to\n * {@link LRUCache#set}.\n */\n noDisposeOnSet?: boolean\n\n /**\n * Boolean flag to tell the cache to not update the TTL when\n * setting a new value for an existing key (ie, when updating a value\n * rather than inserting a new value). Note that the TTL value is\n * _always_ set (if provided) when adding a new entry into the cache.\n *\n * Has no effect if a {@link OptionsBase.ttl} is not set.\n */\n noUpdateTTL?: boolean\n\n /**\n * If you wish to track item size, you must provide a maxSize\n * note that we still will only keep up to max *actual items*,\n * if max is set, so size tracking may cause fewer than max items\n * to be stored. At the extreme, a single item of maxSize size\n * will cause everything else in the cache to be dropped when it\n * is added. Use with caution!\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}, then it will not be stored in the\n * cache.\n */\n maxEntrySize?: Size\n\n /**\n * A function that returns a number indicating the item's size.\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 fetchMethod?: Fetcher<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 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\n * {@link LRUCache#fetch} fails, not any other times.\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 an `'abort'`\n * event, whether user-triggered, or due to internal cache 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 are not\n * immediately resolved or rejected when they are aborted, and instead\n * 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 * **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 export interface OptionsMaxLimit<K, V, FC>\n extends OptionsBase<K, V, FC> {\n max: Count\n }\n export interface OptionsTTLLimit<K, V, FC>\n extends OptionsBase<K, V, FC> {\n ttl: Milliseconds\n ttlAutopurge: boolean\n }\n export interface OptionsSizeLimit<K, V, FC>\n extends OptionsBase<K, V, FC> {\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 * All properties from the options object (with the exception of\n * {@link OptionsBase.max} and {@link OptionsBase.maxSize}) are added as\n * normal public members. (`max` and `maxBase` are read-only getters.)\n * Changing any of these will alter the defaults for subsequent method calls,\n * but is otherwise safe.\n */\nexport class LRUCache<K extends {}, V extends {}, FC = unknown> implements Map<K,V> {\n // properties coming in from the options of these, only max and maxSize\n // really *need* to be protected. The rest can be modified, as they just\n // set defaults for various methods.\n readonly #max: LRUCache.Count\n readonly #maxSize: LRUCache.Size\n readonly #dispose?: LRUCache.Disposer<K, V>\n readonly #disposeAfter?: LRUCache.Disposer<K, V>\n readonly #fetchMethod?: LRUCache.Fetcher<K, V, FC>\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\n #hasDispose: boolean\n #hasFetchMethod: boolean\n #hasDisposeAfter: 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 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: any) => c.#isBackgroundFetch(p),\n backgroundFetch: (\n k: K,\n index: number | undefined,\n options: LRUCache.FetchOptions<K, V, FC>,\n context: any\n ): BackgroundFetch<V> =>\n c.#backgroundFetch(\n k,\n index as Index | undefined,\n options,\n context\n ),\n moveToTail: (index: number): void =>\n c.#moveToTail(index as Index),\n indexes: (options?: { allowStale: boolean }) =>\n c.#indexes(options),\n rindexes: (options?: { allowStale: boolean }) =>\n c.#rindexes(options),\n isStale: (index: number | undefined) =>\n 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 /**\n * {@link LRUCache.OptionsBase.dispose} (read-only)\n */\n get dispose() {\n return this.#dispose\n }\n /**\n * {@link LRUCache.OptionsBase.disposeAfter} (read-only)\n */\n get disposeAfter() {\n return this.#disposeAfter\n }\n\n constructor(\n options: LRUCache.Options<K, V, FC> | LRUCache<K, V, FC>\n ) {\n const {\n max = 0,\n ttl,\n ttlResolution = 1,\n ttlAutopurge,\n updateAgeOnGet,\n updateAgeOnHas,\n allowStale,\n dispose,\n disposeAfter,\n noDisposeOnSet,\n noUpdateTTL,\n maxSize = 0,\n maxEntrySize = 0,\n sizeCalculation,\n fetchMethod,\n noDeleteOnFetchRejection,\n noDeleteOnStaleGet,\n allowStaleOnFetchRejection,\n allowStaleOnFetchAbort,\n ignoreFetchAbort,\n } = options\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 (\n fetchMethod !== undefined &&\n typeof fetchMethod !== 'function'\n ) {\n throw new TypeError(\n 'fetchMethod must be a function if specified'\n )\n }\n this.#fetchMethod = fetchMethod\n this.#hasFetchMethod = !!fetchMethod\n\n this.#keyMap = new Map()\n this.#keyList = new Array(max).fill(undefined)\n this.#valList = new Array(max).fill(undefined)\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 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.#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\n ? ttlResolution\n : 1\n this.ttlAutopurge = !!ttlAutopurge\n this.ttl = ttl || 0\n if (this.ttl) {\n if (!isPosInt(this.ttl)) {\n throw new TypeError(\n 'ttl must be a positive integer if specified'\n )\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 remaining TTL time for a given entry key\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\n this.#setItemTTL = (index, ttl, start = perf.now()) => {\n starts[index] = ttl !== 0 ? start : 0\n ttls[index] = ttl\n if (ttl !== 0 && this.ttlAutopurge) {\n const t = setTimeout(() => {\n if (this.#isStale(index)) {\n this.delete(this.#keyList[index] as K)\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 }\n }\n\n this.#updateItemAge = index => {\n starts[index] = ttls[index] !== 0 ? perf.now() : 0\n }\n\n this.#statusTTL = (status, index) => {\n if (ttls[index]) {\n const ttl = ttls[index]\n const start = starts[index]\n /* c8 ignore next */\n if (!ttl || !start) return\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 = perf.now()\n if (this.ttlResolution > 0) {\n cachedNow = n\n const t = setTimeout(\n () => (cachedNow = 0),\n this.ttlResolution\n )\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<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 this.#addItemSize = (\n index: Index,\n size: LRUCache.Size,\n status?: LRUCache.Status<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 #addItemSize: (\n index: Index,\n size: LRUCache.Size,\n status?: LRUCache.Status<V>\n ) => void = (_i, _s, _st) => {}\n #requireSize: (\n k: K,\n v: V | BackgroundFetch<V>,\n size?: LRUCache.Size,\n sizeCalculation?: LRUCache.SizeCalculator<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; true; ) {\n if (!this.#isValidIndex(i)) {\n break\n }\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; true; ) {\n if (!this.#isValidIndex(i)) {\n break\n }\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 (\n k !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\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 (\n k !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\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 (\n v !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\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 (\n v !== undefined &&\n !this.#isBackgroundFetch(this.#valList[i])\n ) {\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 description of an object.\n * Called by the built-in method 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)\n ? v.__staleWhileFetching\n : 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\n * most recently used to least recently used. fn is called as\n * fn(value, key, cache). Does not update age or recenty of use.\n * Does not iterate over stale values.\n */\n forEach(\n fn: (v: V, k: K, self: LRUCache<K, V, FC>) => any,\n thisp: any = this\n ) {\n for (const i of this.#indexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : 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>) => any,\n thisp: any = this\n ) {\n for (const i of this.#rindexes()) {\n const v = this.#valList[i]\n const value = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : 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)\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. Like {@link LRUCache#dump}, but just for a\n * single key. Always returns stale values, if their info is found in the\n * cache, so be sure to check for expired TTLs 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 const value: V | undefined = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : v\n if (value === undefined) return undefined\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 - (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 cache.load()\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 = this.#isBackgroundFetch(v)\n ? v.__staleWhileFetching\n : 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 = 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 * Note that the shape of the resulting cache may be different if the\n * same options are not used in both caches.\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 = 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 set(\n k: K,\n v: V | BackgroundFetch<V> | undefined,\n setOptions: LRUCache.SetOptions<K, V, FC> = {}\n ) {\n if (v === undefined) {\n this.delete(k)\n return this\n }\n const {\n ttl = this.ttl,\n start,\n noDisposeOnSet = this.noDisposeOnSet,\n sizeCalculation = this.sizeCalculation,\n status,\n } = setOptions\n let { noUpdateTTL = this.noUpdateTTL } = setOptions\n\n const size = this.#requireSize(\n k,\n v,\n setOptions.size || 0,\n sizeCalculation\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 if (status) {\n status.set = 'miss'\n status.maxEntrySizeExceeded = true\n }\n // have to delete, in case something is there already.\n this.delete(k)\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\n ? this.#tail\n : this.#free.length !== 0\n ? this.#free.pop()\n : this.#size === this.#max\n ? this.#evict(false)\n : this.#size\n ) 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 } 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 (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 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 * 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 { updateAgeOnHas = this.updateAgeOnHas, status } =\n 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 { allowStale = this.allowStale } = peekOptions\n const index = this.#keyMap.get(k)\n if (\n index === undefined ||\n (!allowStale && this.#isStale(index))\n ) {\n return\n }\n const v = this.#valList[index]\n // either stale and allowed, or forcing a refresh of non-stale value\n return this.#isBackgroundFetch(v) ? v.__staleWhileFetching : v\n }\n\n #backgroundFetch(\n k: K,\n index: Index | undefined,\n options: LRUCache.FetchOptions<K, V, FC>,\n context: any\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 AC()\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 = (\n v: V | undefined,\n updateCache = false\n ): V | undefined => {\n const { aborted } = ac.signal\n const ignoreAbort = options.ignoreFetchAbort && 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)\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 (this.#valList[index as Index] === p) {\n if (v === undefined) {\n if (bf.__staleWhileFetching) {\n this.#valList[index as Index] = bf.__staleWhileFetching\n } else {\n this.delete(k)\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: any) => {\n if (options.status) {\n options.status.fetchRejected = true\n options.status.fetchError = er\n }\n return fetchFail(er)\n }\n\n const fetchFail = (er: any): V | undefined => {\n const { aborted } = ac.signal\n const allowStaleAborted =\n 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 = !noDelete || bf.__staleWhileFetching === undefined\n if (del) {\n this.delete(k)\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: any) => 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 (\n !options.ignoreFetchAbort ||\n options.allowStaleOnFetchAbort\n ) {\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: any): 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 AC\n )\n }\n\n /**\n * Make an asynchronous cached fetch using the\n * {@link LRUCache.OptionsBase.fetchMethod} function.\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 fetch(\n k: K,\n fetchOptions: unknown extends FC\n ? LRUCache.FetchOptions<K, V, FC>\n : FC extends undefined | void\n ? LRUCache.FetchOptionsNoContext<K, V>\n : LRUCache.FetchOptionsWithContext<K, V, FC>\n ): Promise<undefined | V>\n // this overload not allowed if context is required\n fetch(\n k: unknown extends FC\n ? K\n : FC extends undefined | void\n ? K\n : never,\n fetchOptions?: unknown extends FC\n ? LRUCache.FetchOptions<K, V, FC>\n : FC extends undefined | void\n ? LRUCache.FetchOptionsNoContext<K, V>\n : never\n ): Promise<undefined | V>\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\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)\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 =\n 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)\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 * 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 {\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 const value = this.#valList[index]\n const fetching = this.#isBackgroundFetch(value)\n if (status) this.#statusTTL(status, index)\n if (this.#isStale(index)) {\n if (status) status.get = 'stale'\n // delete only if not an in-flight background fetch\n if (!fetching) {\n if (!noDeleteOnStaleGet) {\n this.delete(k)\n }\n if (status && allowStale) status.returnedStale = true\n return allowStale ? value : undefined\n } else {\n if (\n status &&\n allowStale &&\n value.__staleWhileFetching !== undefined\n ) {\n status.returnedStale = true\n }\n return allowStale ? value.__staleWhileFetching : undefined\n }\n } else {\n if (status) status.get = '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 if (fetching) {\n return value.__staleWhileFetching\n }\n this.#moveToTail(index)\n if (updateAgeOnGet) {\n this.#updateItemAge(index)\n }\n return value\n }\n } else if (status) {\n status.get = 'miss'\n }\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 * Returns true if the key was deleted, false otherwise.\n */\n delete(k: K) {\n let deleted = false\n if (this.#size !== 0) {\n const index = this.#keyMap.get(k)\n if (index !== undefined) {\n deleted = true\n if (this.#size === 1) {\n this.clear()\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, 'delete')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v as V, k, 'delete'])\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 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, 'delete')\n }\n if (this.#hasDisposeAfter) {\n this.#disposed?.push([v as V, k as K, 'delete'])\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 }\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"]} |