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\nDefault: `Infinity`\n\nMilliseconds until the cache expires.\n\n##### cacheKey\n\nType: `Function`\n\nDetermines the cache key for storing the result based on the function arguments. By default, if there's only one argument and it's a [primitive](https://developer.mozilla.org/en-US/docs/Glossary/Primitive), it's used directly as a key, otherwise it's all the function arguments JSON stringified as an array.\n\nYou could for example change it to only cache on the first argument `x => JSON.stringify(x)`.\n\n##### cache\n\nType: `Object`
\nDefault: `new Map()`\n\nUse a different cache storage. Must implement the following methods: `.has(key)`, `.get(key)`, `.set(key, value)`, `.delete(key)`, and optionally `.clear()`. You could for example use a `WeakMap` instead or [`quick-lru`](https://github.com/sindresorhus/quick-lru) for a LRU cache.\n\n##### cachePromiseRejection\n\nType: `boolean`
\nDefault: `false`\n\nCache rejected promises.\n\n### mem.clear(fn)\n\nClear all cached data of a memoized function.\n\n#### fn\n\nType: `Function`\n\nMemoized function.\n\n\n## Tips\n\n### Cache statistics\n\nIf you want to know how many times your cache had a hit or a miss, you can make use of [stats-map](https://github.com/SamVerschueren/stats-map) as a replacement for the default cache.\n\n#### Example\n\n```js\nconst mem = require('mem');\nconst StatsMap = require('stats-map');\nconst got = require('got');\n\nconst cache = new StatsMap();\nconst memGot = mem(got, {cache});\n\n(async () => {\n\tawait memGot('sindresorhus.com');\n\tawait memGot('sindresorhus.com');\n\tawait memGot('sindresorhus.com');\n\n\tconsole.log(cache.stats);\n\t//=> {hits: 2, misses: 1}\n})();\n```\n\n\n## Related\n\n- [p-memoize](https://github.com/sindresorhus/p-memoize) - Memoize promise-returning & async functions\n\n\n## License\n\nMIT © [Sindre Sorhus](https://sindresorhus.com)\n", "readmeFilename": "readme.md", "repository": { "type": "git", "url": "git+https://github.com/sindresorhus/mem.git" }, "scripts": { "test": "xo && ava" }, "version": "4.0.0" }