Babel Configuration

This boilerplate uses babel-preset-env for configuring babel. You can read more about it here -

A Babel preset that compiles ES2015+ down to ES5 by automatically determining the Babel plugins and polyfills you need based on your targeted browser or runtime environments.

It uses browserslist to parse this information, so we can use any valid query format supported by browserslist.

However there is a caveat. browserslist recommends defining the target in a common place like package.json or in a .browserslistrc config file. This allows tools like autoprefixer and eslint-plugin-compat to share the config. For this template, browserslist is configured in the package.json:

  "...": "...",
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"

But the latest stable release of babel-preset-env, v1.6.1 does not support loading the config from package.json. So the target environment is repeated in .babelrc. If you wish to change your target environment, please be sure to update both package.json and .babelrc. Note that this has been fixed in the beta version(@babel/preset-env@7.0.0-beta.34) and the template will be updated once it is out of beta.

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