babelrc

The entire range of Babel API options are allowed.

Example:

{
  "stage": 1,
  "loose": ["es6.modules", "es6.classes"],
  "ignore": [
    "foo.js",
    "bar/**/*.js"
  ]
}

env option

You can use the env option to set specific options when in a certain environment:

{
  "env": {
    "production": {
      "optional": ["optimisation", "minification"]
    }
  }
}

The env key will be taken from process.env.BABEL_ENV, when this is not available then it uses process.env.NODE_ENV if even that is not available then it defaults to "development".

You can set this environment variable with the following:

Unix

# at the start of a command
$ BABEL_ENV=production YOUR_COMMAND_HERE

# or as a separate command
$ NODE_ENV=production
$ YOUR_COMMAND_HERE

Windows

$ SET BABEL_ENV=production
$ YOUR_COMMAND_HERE

Use via package.json

You can alternatively choose to specify your .babelrc config from within package.json like so:

{
  "name": "my-package",
  "version": "1.0.0",
  "babel": {
    // my babel config here
  }
}