Ensure that script commands in package.json are only allowed to execute on specified git branches

This module should be installed as one of your project's devDependencies:

npm install --save-dev check-git-branch

You might also want to consider using cross-env:

npm install --save-dev cross-env

example of the scripts section in your project's package.json:

"scripts": {
   "build": "branch master && cross-env NODE_ENV=production node build/build.js",
   "build-test": "branch dev && cross-env NODE_ENV=sandbox node build/build.js"
},