accelerator-core/config/webpack/getJavaScriptMinimizer.js

[](https://travis-ci.org/furkleindustries/accelerator-core)

import TerserPlugin from 'terser-webpack-plugin';

export function getJavaScriptMinimizer(shouldUseSourceMap) {
  return new TerserPlugin({
    terserOptions: {
      parse: {
        // we want terser to parse ecma 8 code. However, we don't want it
        // to apply any minfication steps that turns valid ecma 5 code
        // into invalid ecma 5 code. This is why the 'compress' and 'output'
        // sections only apply transformations that are ecma 5 safe
        // https://github.com/facebook/create-react-app/pull/4234
        ecma: 8,
      },
  
      compress: {
        ecma: 5,
        warnings: false,
      },
  
      mangle: {
        safari10: true,
      },
  
      output: {
        ecma: 5,
        comments: false,
        // Turned on because emoji and regex is not minified properly using default
        // https://github.com/facebook/create-react-app/issues/2488
        ascii_only: true,
      },
    },
  
    // Use multi-process parallel running to improve the build speed
    // Default number of concurrent runs: os.cpus().length - 1
    parallel: true,
    // Enable file caching
    cache: true,
    sourceMap: shouldUseSourceMap,
  });
}