Commits on Nov 18, 2018

1. Switch from uglifyjs-webpack-plugin to terser-webpack-plugin …

   Some history:
   * `uglifyjs-webpack-plugin` < v1.0 used the minifier `uglify-js`
   * however `uglify-js` does not support ES6, which resulted in a fork
     called `uglify-es` that was developed in the `uglify-js` repository,
     but under the `harmony` branch
   * `uglifyjs-webpack-plugin` v1.x switched to `uglify-es` for ES6 support
   * however `uglify-es` stopped being maintained:
     mishoo/UglifyJS#3156 (comment)
   * which led to a fork called `terser` that has incorporated all of
     the unmerged PRs and will be where all new development occurs:
     https://github.com/fabiosantoscode/terser
   * `terser-webpack-plugin` was created, which is the `terser` equivalent
     of `uglifyjs-webpack-plugin`:
     https://github.com/webpack-contrib/terser-webpack-plugin
   * `uglifyjs-webpack-plugin` v2.x will be switching back to `uglify-js`,
     so any project that needs to support ES6 now needs to switch to
     `terser-webpack-plugin`.
   
   Fixes #7923.

   

   edmorley authored and vkrol committed Nov 18, 2018
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2. Rename test directories too

   

   edmorley authored and vkrol committed Nov 18, 2018
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3. fix for changed API in terser plugin warningsFilter

   

   sokra authored and vkrol committed Nov 18, 2018
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