Replace uglify with terser

[soreng]

npm install terser-webpack-plugin --save-dev
npm uninstall uglifyjs-webpack-plugin
npm uninstall uglify-js

in webpack.config.js we replaced the uglify plugin, but retained the same options:

            new TerserPlugin({
                sourceMap: true,
                terserOptions: {
                    ecma: 8,
                    mangle: false,
                    keep_classnames: true,
                    keep_fnames: true
                }
            })

[Dan9boi]

good job @soreng 💯

[hesselberg]

@soreng how come we're doing this?

[Dan9boi]

@hesselberg actually what they say on github:

Why choose terser?
uglify-es is no longer maintained and uglify-js does not support ES6+.

terser is a fork of uglify-es that mostly retains API and CLI compatibility with uglify-es and uglify-js@3.

@soreng

[hesselberg]

@Dan9boi all good, just think its important we document/explain why we are doing things :-)