Use terser for minification

app/webpack.production.ts

@@ -4,14 +4,10 @@ import * as webpack from 'webpack'
 import merge from 'webpack-merge'
 import MiniCssExtractPlugin from 'mini-css-extract-plugin'
 import { BundleAnalyzerPlugin } from 'webpack-bundle-analyzer'
-const MinifyPlugin = require('babel-minify-webpack-plugin')
 
 const config: webpack.Configuration = {
   mode: 'production',
   devtool: 'source-map',
-  optimization: {
-    minimizer: [new MinifyPlugin()],
-  },
 }
 
 const mainConfig = merge({}, common.main, config)

docs/technical/packaging.md

@@ -31,9 +31,6 @@ Webpack also handles these steps:
  - SCSS stylesheets under `app/styles/` are transpiled to CSS and emitted
  - source maps are generated to help with correlating runtime errors to the
    corresponding TypeScript source
- - in production mode `babel-minify` is used to minify the emitted JavaScript -
-   we do this over the in-built `uglify-es` support because `uglify-es` caused
-   some problems in the past generating invalid minified JS. See [#4859](https://github.com/desktop/desktop/pull/4859) and [#4848](https://github.com/desktop/desktop/pull/4848) for more information.
 
 The output from webpack is stored in the `out` directory, and this folder is
 ignored in version control.

package.json

@@ -65,7 +65,6 @@
     "aws-sdk": "^2.23.0",
     "babel-core": "^6.26.3",
     "babel-jest": "^23.4.2",
-    "babel-minify-webpack-plugin": "^0.3.1",
     "babel-plugin-syntax-dynamic-import": "^6.18.0",
     "chalk": "^2.2.0",
     "clean-webpack-plugin": "^0.1.19",