downgrade uglifyjs-webpack-plugin to v0.4

[thinhbuzz]

because v1.0 using for webpack 4.0:

from uglifyjs-webpack-plugin:

ℹ️ webpack =< v3.0.0 currently contains v0.4.6 of this plugin under webpack.optimize.UglifyJsPlugin as an alias. For usage of the latest version (v1.0.0), please follow the instructions below. Aliasing v1.0.0 as webpack.optimize.UglifyJsPlugin is scheduled for webpack v4.0.0

[LinusBorg]

That quote alone is no reason to not use this plugin. It is meant to work with webpack 3 just as well - it just won't be included into webpack before 4.0.0

But maybe we have to temporarily downgrade because of webpack-contrib/uglifyjs-webpack-plugin#197

I will take a closer look tomorrow afternoon, won't be on a laptop before that.

[LinusBorg]

Note: downgrading the version won't be enough, as plugin options work differenlty for 0.4 and 1.0.0:

#1119

[thinhbuzz]

why do you want to ignore offcial note of plugin?

[LinusBorg]

I didn't ignore it. I explained to you how I think you misunderstand it.

• That plugin has a 1.0.0 release - that means it's stable.
• The note only says "we will include this in the webpack default plugins starting with webpack 4.0.0".
• It does not say "don't use this plugin, it's not ready yet"

[LinusBorg]

Problem was fixed with v1.16 of the plugin, so we can close this.