Strict mode - Detect duplicate UglifyPlugin

Just saw a case where a user was using -p and UglifyPlugin separately. Latter was used to set compress['drop_console']. The problem is that this will lead to double minification and it won’t work as you might expect.

It would be good to be able to detect this case. Perhaps the same applies to some other plugins as well, but this would be a nice starting point.

[bebraw]

Honestly, this seems like something Webpack should warn about by itself…

Absolutely. We are just putting some bandaid on it. 😉

The implementation doesn’t look too bad. Both cases are fairly straight-forward to handle because we can piggyback on webpack’s own logic here.

[bebraw]

Yep, sounds reasonable. More brittle script parsing, but I guess PRs to webpack itself aren’t very likely to get through, or am I wrong?

I’m not so sure. We can definitely build an awesome prototype here and then negotiate. These kind of things are fairly simple in user space.

My thinking is that webpack core should drop all the flag stuff (less to maintain) but that’s another discussion. 👍