Fix "The code generator has deoptimised the styling of [some file]" as it exceeds the max of "500KB"

针对这一问题，不同版本的webpack 处理方式不同

最直接的解决方案：

• https://stackoverflow.com/questions/29576341/what-does-the-code-generator-has-deoptimised-the-styling-of-some-file-as-it-e

针对 webpack 3.8.1 版本的处理方式

// Process JS with Babel.
{
  test: /\.(js|jsx|mjs)$/,
  include: paths.appSrc,
  loader: require.resolve('babel-loader'),
  options: {
    compact: true,
  }
}