JarCastinghas-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
Usage
.
├── foo
│ └── package.json
└── bar
├── package.json
└── yarn.lock
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
Default: process.cwd()
Current working directory.
Related
- has-yarn-cli - CLI for this module
License
MIT © Sindre Sorhus