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on npm](https://badgen.net/npm/v/cache-point)](https://www.npmjs.org/package/cache-point)\n[![npm module downloads](https://badgen.net/npm/dt/cache-point)](https://www.npmjs.org/package/cache-point)\n[![Gihub repo dependents](https://badgen.net/github/dependents-repo/75lb/cache-point)](https://github.com/75lb/cache-point/network/dependents?dependent_type=REPOSITORY)\n[![Gihub package dependents](https://badgen.net/github/dependents-pkg/75lb/cache-point)](https://github.com/75lb/cache-point/network/dependents?dependent_type=PACKAGE)\n[![Node.js CI](https://github.com/75lb/cache-point/actions/workflows/node.js.yml/badge.svg)](https://github.com/75lb/cache-point/actions/workflows/node.js.yml)\n[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg)](https://github.com/feross/standard)\n\n# cache-point\n\nSimple, filesystem-backed memoisation cache. Use to cache the output of expensive operations speeding up future invocations with the same input.\n\n## Synopsis\n\n```js\nimport Cache from 'cache-point'\nimport { setTimeout as sleep } from 'node:timers/promises'\n\n/* mock function to simulate a slow, remote request */\nasync function fetchUser (id) {\n await sleep(1000)\n return { id, name: 'Layla' }\n}\n\nclass Users {\n constructor () {\n this.cache = new Cache({ dir: 'tmp/example' })\n }\n\n async getUser (id) {\n let user\n try {\n /* cache.read() will resolve on hit, reject on miss */\n user = await this.cache.read(id)\n } catch (err) {\n if (err.code === 'ENOENT') {\n /* cache miss, fetch remote user */\n user = await fetchUser(id)\n this.cache.write(id, user)\n }\n }\n return user\n }\n}\n\nconsole.time('getUser')\nconst users = new Users()\nconst user = await users.getUser(10)\nconsole.timeEnd('getUser')\nconsole.log(user)\n```\n\nThe first invocation will take 1 second while the remote user is fetched.\n\n```\n$ node example/simple.js\ngetUser: 1.025s\n{ id: 10, name: 'Layla' }\n```\n\nSince the cache is now warm, future invocations will be fast.\n\n```\n$ node example/simple.js\ngetUser: 17.07ms\n{ id: 10, name: 'Layla' }\n```\n\n## API Reference\n\n\n\n## cache-point\n\n* [cache-point](#module_cache-point)\n * [Cache](#exp_module_cache-point--Cache) ⏏\n * [new Cache([options])](#new_module_cache-point--Cache_new)\n * [.dir](#module_cache-point--Cache+dir) : string\n * [.read(keys)](#module_cache-point--Cache+read) ⇒ Promise\n * [.readSync(keys)](#module_cache-point--Cache+readSync) ⇒ string\n * [.write(keys, content)](#module_cache-point--Cache+write) ⇒ Promise\n * [.writeSync(keys, content)](#module_cache-point--Cache+writeSync)\n * [.getChecksum(keys)](#module_cache-point--Cache+getChecksum) ⇒ string\n * [.clear()](#module_cache-point--Cache+clear) ⇒ Promise\n * [.remove()](#module_cache-point--Cache+remove) ⇒ Promise\n\n\n\n### Cache ⏏\n**Kind**: Exported class \n\n\n#### new Cache([options])\n\n| Param | Type |\n| --- | --- |\n| [options] | object | \n| [options.dir] | string | \n\n\n\n#### cache.dir : string\nCurrent cache directory. Can be changed at any time.\n\n**Kind**: instance property of [Cache](#exp_module_cache-point--Cache) \n\n\n#### cache.read(keys) ⇒ Promise\nA cache hit resolves with the stored value, a miss rejects with an `ENOENT` error code.\n\n**Kind**: instance method of [Cache](#exp_module_cache-point--Cache) \n**Throws**:\n\n- ENOENT\n\n\n| Param | Type | Description |\n| --- | --- | --- |\n| keys | \\* | One or more values to uniquely identify the data. Can be any value, or an array of values of any type. |\n\n\n\n#### cache.readSync(keys) ⇒ string\nA cache hit returns the stored value, a miss returns `null`.\n\n**Kind**: instance method of [Cache](#exp_module_cache-point--Cache) \n\n| Param | Type | Description |\n| --- | --- | --- |\n| keys | \\* | One or more values to uniquely identify the data. Can be any value, or an array of values of any type. |\n\n\n\n#### cache.write(keys, content) ⇒ Promise\nWrite some data to the cache. Returns a promise which resolves when the write is complete.\n\n**Kind**: instance method of [Cache](#exp_module_cache-point--Cache) \n\n| Param | Type | Description |\n| --- | --- | --- |\n| keys | \\* | One or more values to index the data, e.g. a request object or set of function args. |\n| content | \\* | the data to store |\n\n\n\n#### cache.writeSync(keys, content)\nWrite some data to the cache with a key.\n\n**Kind**: instance method of [Cache](#exp_module_cache-point--Cache) \n\n| Param | Type | Description |\n| --- | --- | --- |\n| keys | \\* | One or more values to index the data, e.g. a request object or set of function args. |\n| content | \\* | the data to store |\n\n\n\n#### cache.getChecksum(keys) ⇒ string\nUsed internally to convert a key value into a hex checksum. Override if for some reason you need a different hashing strategy.\n\n**Kind**: instance method of [Cache](#exp_module_cache-point--Cache) \n\n| Param | Type | Description |\n| --- | --- | --- |\n| keys | \\* | One or more values to index the data, e.g. a request object or set of function args. |\n\n\n\n#### cache.clear() ⇒ Promise\nClears the cache. Returns a promise which resolves once the cache is clear.\n\n**Kind**: instance method of [Cache](#exp_module_cache-point--Cache) \n\n\n#### cache.remove() ⇒ Promise\nClears and removes the cache directory. Returns a promise which resolves once the remove is complete.\n\n**Kind**: instance method of [Cache](#exp_module_cache-point--Cache) \n\n* * *\n\n© 2016-25 Lloyd Brookes \\.\n\nTested by [test-runner](https://github.com/test-runner-js/test-runner). Documented by [jsdoc-to-markdown](https://github.com/jsdoc2md/jsdoc-to-markdown).\n","_attachments":{},"homepage":"https://github.com/75lb/cache-point#readme","bugs":{"url":"https://github.com/75lb/cache-point/issues"},"license":"MIT"}