Simplify extension management in webpack

webpack.config.js

const ext = (...suffix) => new RegExp(`\\.(?:${ suffix.join('|') })(?:[?#].*)?$`)

const loaders = [
  // Traditional cases
  { test: ext('css'), loaders: ['style', 'css'] },  // single
  { test: ext('js', 'jsx', 'es6'), loaders: ['babel'] }, // multiple
  
  // Complex case: Font-Awesome adds query strings and/or hashs to files
  { test: ext('otf', 'eot', 'svg', 'ttf', 'woff', 'woff2'), loaders: ['file?name=[name].[ext]'] },
]