Look into enabling mangle-props and mangle-regex terser's options

[XhmikosR]

See #21715

[XhmikosR]

@Johann-S: you want to leave this open or should we close it?

[Johann-S]

Didn't hade time to shim on that issue 😟 but maybe in the futur 😄 so we can let that issue openned

[mdo]

@XhmikosR Should we close this out if we're moving off Uglify?

[XhmikosR]

terser has the same options, at least for the time being, so this still applies.

[XhmikosR]

FYI this does save us currently 608 bytes from the gzip bootstrap.min.js file on the current master:

We just need to test the minified build or something, so that we are sure nothing breaks.

EDIT:

We should really try to do this: