uglify-es unmaintained

[jonathanolson]

The release of uglify-es (the support for ES6) has been unmaintained for a number of months, and development looks like it has switched to https://github.com/terser-js/terser (see mishoo/UglifyJS#3156 (comment)).

Is it worth proactively switching, or waiting until we need some sort of upgrade?

[samreid]

I'd recommend spending initial time (1-2 hours)? investigating a proactive switch--if the API is compatible and transition is easy, then great. If we run into severe issues or compatibility issues we can re-evaluate.

[jonathanolson]

if the API is compatible

From the documentation:

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

So it seems like it should be fairly straightforward.

[samreid]

@zepumph volunteered to investigate this

[jonathanolson]

Was easy to do while investigating uglification times. Handled on the modules branch, closing.