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