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has-yarn

Check if a project is using Yarn

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

.
├── foo
│   └── package.json
└── bar
    ├── package.json
    └── yarn.lock

const hasYarn = require('has-yarn');

hasYarn('foo');
//=> false

hasYarn('bar');
//=> true

Returns a boolean of whether the project uses Yarn.

Type: string
Default: process.cwd()

Current working directory.