has-yarn

What is has-yarn?

The has-yarn npm package is a simple utility that checks if a project is using Yarn as its package manager by looking for a 'yarn.lock' file in the project directory. It is useful for tooling and scripts that need to adapt their behavior based on the package manager being used.

What are has-yarn's main functionalities?

Check if Yarn is being used

This feature allows you to check if a project is using Yarn by invoking the hasYarn function. It returns true if a 'yarn.lock' file is found in the project directory, indicating that Yarn is being used.

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

if (hasYarn()) {
  console.log('The project uses Yarn.');
} else {
  console.log('The project does not use Yarn.');
}

Other packages similar to has-yarn

yarn-or-npm

yarn-or-npm is a more versatile package that can detect whether Yarn or npm is being used in a project. It can return 'yarn' or 'npm' based on the lock file detected, providing a direct comparison to the singular focus of has-yarn.

README

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

Usage

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

import hasYarn from '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()

The current working directory.

Related

• has-yarn-cli - CLI for this module