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# has-yarn [](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.
## Install
```
$ npm install --save 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`.
#### cwd
Type: `string`<br>
Default: `process.cwd()`
Current working directory.
## License
MIT © [Sindre Sorhus](https://sindresorhus.com)
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