please-use-npm

Request that users use npm instead of yarn.

If run from yarn instead of npm, the process will exit with error code 1 and print an error message.

Install

npm install --save-dev please-use-npm

Use

CLI

For example, in your package.json:

{
  "scripts": {
     "preinstall": "npm i -D --ignore-scripts please-use-npm && use-npm"
  }
}

Or if you have npx:

{
  "scripts": {
     "preinstall": "npx please-use-npm"
  }
}

You may provide a custom message as an argument:

{
  "scripts": {
     "preinstall": "npx please-use-npm 'Please use npm!'"
  }
}

You may disable please-use-npm by setting the DISABLE_USE_NPM environment variable to true:

{
  "scripts": {
     "preinstall": "DISABLE_USE_NPM=true npx please-use-npm"
  }
}

API

var useNpm = require('please-use-npm');

useNpm();

// or a custom message
useNpm('You should switch back to npm. Version >=5 is really great.');

Acknowledgements

Forked from use-yarn.

MIT