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+# has-yarn [![Build Status](https://travis-ci.org/sindresorhus/has-yarn.svg?branch=master)](https://travis-ci.org/sindresorhus/has-yarn)
+
+> Check if a project is using [Yarn](https://yarnpkg.com)
+
+Useful for tools that needs to know whether to use `yarn` or `npm` to install dependencies.
+
+It checks if a `yarn.lock` file is present in the working directory.
+
+
+## Install
+
+```
+$ npm install has-yarn
+```
+
+
+## Usage
+
+```
+.
+├── foo
+│   └── package.json
+└── bar
+    ├── package.json
+    └── yarn.lock
+```
+
+```js
+const hasYarn = require('has-yarn');
+
+hasYarn('foo');
+//=> false
+
+hasYarn('bar');
+//=> true
+```
+
+
+## API
+
+### hasYarn([cwd])
+
+Returns a `boolean` of whether the project uses Yarn.
+
+#### cwd
+
+Type: `string`<br>
+Default: `process.cwd()`
+
+Current working directory.
+
+
+## Related
+
+- [has-yarn-cli](https://github.com/sindresorhus/has-yarn-cli) - CLI for this module
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)