sindresorhus

quick-lru

		if (!(options.maxSize && options.maxSize > 0)) {

			throw new TypeError('`maxSize` must be a number greater than 0');

		if (typeof options.maxAge === 'number' && options.maxAge === 0) {

			throw new TypeError('`maxAge` must be a number greater than 0');

		// TODO: Use private class fields when ESLint supports them.

		this.maxAge = options.maxAge || Number.POSITIVE_INFINITY;

	// TODO: Use private class methods when targeting Node.js 16.

		if (typeof this.onEviction !== 'function') {

		if (typeof item.expiry === 'number' && item.expiry <= Date.now()) {

			if (typeof this.onEviction === 'function') {

		const deleted = this._deleteIfExpired(key, item);

		return item.expiry ? this._getOrDeleteIfExpired(key, item) : item.value;

				const deleted = this._deleteIfExpired(key, value);

			this._set(key, {value, expiry: maxAge});

			return !this._deleteIfExpired(key, this.cache.get(key));

			return !this._deleteIfExpired(key, this.oldCache.get(key));

			return this._peek(key, this.oldCache);

		const deleted = this.cache.delete(key);

		return this.oldCache.delete(key) || deleted;

		const items = [...this._entriesAscending()];

		const removeCount = items.length - newSize;

				this._emitEvictions(items.slice(0, removeCount));

			this.oldCache = new Map(items.slice(removeCount));

	"description": "Simple “Least Recently Used” (LRU) cache",

	"funding": "https://github.com/sponsors/sindresorhus",

# quick-lru [![Coverage Status](https://codecov.io/gh/sindresorhus/quick-lru/branch/master/graph/badge.svg)](https://codecov.io/gh/sindresorhus/quick-lru/branch/master)

# quick-lru [![Coverage Status](https://codecov.io/gh/sindresorhus/quick-lru/branch/main/graph/badge.svg)](https://codecov.io/gh/sindresorhus/quick-lru/branch/main)

> Simple [“Least Recently Used” (LRU) cache](https://en.m.wikipedia.org/wiki/Cache_replacement_policies#Least_Recently_Used_.28LRU.29)

Useful when you need to cache something and limit memory usage.

Inspired by the [`hashlru` algorithm](https://github.com/dominictarr/hashlru#algorithm), but instead uses [`Map`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Map) to support keys of any type, not just strings, and values can be `undefined`.

const lru = new QuickLRU({maxSize: 1000});

The maximum number of items before evicting the least recently used items.

The maximum number of milliseconds an item should remain in cache.

By default maxAge will be Infinity, which means that items will never expire.

Lazy expiration happens upon the next `write` or `read` call.

Individual expiration of an item can be specified by the `set(key, value, options)` method.

Called right before an item is evicted from the cache.

Useful for side effects or for items like object URLs that need explicit cleanup (`revokeObjectURL`).

The instance is an [`Iterable`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Iteration_protocols) of `[key, value]` pairs so you can use it directly in a [`for…of`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/for...of) loop.

Both `key` and `value` can be of any type.

Individual expiration of an item can be specified with the `maxAge` option. If not specified, the global `maxAge` value will be used in case it is specified on the constructor, otherwise the item will never expire.

Get an item without marking it as recently used.

Returns `true` if the item is removed or `false` if the item doesn't exist.

		{
		"name": "quick-lru",
		"version": "6.0.0",
		"version": "6.0.1",
		"description": "Simple “Least Recently Used” (LRU) cache",
		@@ -5,0 +5,0 @@ "license": "MIT",

		@@ -117,3 +117,3 @@ export default class QuickLRU {
		value,
		maxAge
		expiry: maxAge
		});
		@@ -120,0 +120,0 @@ } else {

		@@ -1,2 +0,2 @@
		# quick-lru [![Coverage Status](https://codecov.io/gh/sindresorhus/quick-lru/branch/master/graph/badge.svg)](https://codecov.io/gh/sindresorhus/quick-lru/branch/master)
		# quick-lru [![Coverage Status](https://codecov.io/gh/sindresorhus/quick-lru/branch/main/graph/badge.svg)](https://codecov.io/gh/sindresorhus/quick-lru/branch/main)

		@@ -3,0 +3,0 @@ > Simple [“Least Recently Used” (LRU) cache](https://en.m.wikipedia.org/wiki/Cache_replacement_policies#Least_Recently_Used_.28LRU.29)

Improved metrics