110 lines
2.8 KiB
Markdown
110 lines
2.8 KiB
Markdown
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# find-cache-dir
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> Finds the common standard cache directory
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The [`nyc`](https://github.com/istanbuljs/nyc) and [`AVA`](https://ava.li) projects decided to standardize on a common directory structure for storing cache information:
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```sh
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# nyc
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./node_modules/.cache/nyc
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# ava
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./node_modules/.cache/ava
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# your-module
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./node_modules/.cache/your-module
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```
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This module makes it easy to correctly locate the cache directory according to this shared spec. If this pattern becomes ubiquitous, clearing the cache for multiple dependencies becomes easy and consistent:
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```
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rm -rf ./node_modules/.cache
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```
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## Install
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```sh
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npm install find-cache-dir
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```
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## Usage
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```js
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import findCacheDirectory from 'find-cache-dir';
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findCacheDirectory({name: 'unicorns'});
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//=> '/user/path/node-modules/.cache/unicorns'
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```
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## API
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### findCacheDirectory(options?)
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Finds the cache directory using the supplied options. The algorithm checks for the `CACHE_DIR` environmental variable and uses it if it is not set to `true`, `false`, `1` or `0`. If one is not found, it tries to find a `package.json` file, searching every parent directory of the `cwd` specified (or implied from other options). It returns a `string` containing the absolute path to the cache directory, or `undefined` if `package.json` was never found or if the `node_modules` directory is unwritable.
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#### options
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Type: `object`
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##### name
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*Required*\
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Type: `string`
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Should be the same as your project name in `package.json`.
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##### files
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Type: `string[] | string`
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An array of files that will be searched for a common parent directory. This common parent directory will be used in lieu of the `cwd` option below.
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##### cwd
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Type: `string`\
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Default `process.cwd()`
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Directory to start searching for a `package.json` from.
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##### create
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Type: `boolean`\
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Default `false`
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If `true`, the directory will be created synchronously before returning.
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##### thunk
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Type: `boolean`\
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Default `false`
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If `true`, this modifies the return type to be a function that is a thunk for `path.join(theFoundCacheDirectory)`.
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```js
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const thunk = findCacheDir({name: 'foo', thunk: true});
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thunk();
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//=> '/some/path/node_modules/.cache/foo'
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thunk('bar.js')
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//=> '/some/path/node_modules/.cache/foo/bar.js'
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thunk('baz', 'quz.js')
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//=> '/some/path/node_modules/.cache/foo/baz/quz.js'
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```
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This is helpful for actually putting actual files in the cache!
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## Tips
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- To test modules using `find-cache-dir`, set the `CACHE_DIR` environment variable to temporarily override the directory that is resolved.
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## Adopters
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- [`ava`](https://avajs.dev)
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- [`nyc`](https://github.com/istanbuljs/nyc)
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- [`storybook`](https://github.com/storybookjs/storybook)
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- [`babel-loader`](https://github.com/babel/babel-loader)
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- [`eslint-loader`](https://github.com/MoOx/eslint-loader)
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- [More…](https://www.npmjs.com/browse/depended/find-cache-dir)
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