How do you configure babel to run with different configurations in different environments

Question

Set up different environments in your .babelrc

{
  "env": {
    "dev": {
       "presets": ["es2015"],
       "plugins":["x"]
     },
    "test": {
      "presets": ["es2015"]
    }
  }
}

And then run babel after you have set your BABEL_ENV

BABEL_ENV=test <commandhere> or BABEL_ENV=dev <commandhere>

If you don’t set BABEL_ENV, babel will use the NODE_ENV value.
If you don’t set either BABEL_ENV nor NODE_ENV, it will use ‘development’.

CODE BELOW:

function getEnv(defaultValue = "development") {
  return process.env.BABEL_ENV || process.env.NODE_ENV || defaultValue;
}