I did the minifying with https://skalman.github.io/UglifyJS-online/ - we need to remember to update the minified versions whenever updating the un-minified prelude! @shurcooL

@dave 💯 👍 to what you're proposing here. Would love to benefit from this too.

we need to remember to update the minified versions whenever updating the un-minified prelude

I think we can automate this fairly easily and add a check to circle.yml to ensure the committed minified code is consistent with the unminified code.

Something along the lines of:

• add a package.json to the repo root, have uglify-es as a dev dependency
• add a // +build ignore-d main-package .go file to the compiler/prelude directory that outputs github.com/gopherjs/gopherjs/compiler/prelude.Prelude which can then be piped to uglifyjs and then written to a generated file that defines github.com/gopherjs/gopherjs/compiler/prelude.PredudeMinified in another file in compiler/prelude
• add a step to circle.yml to re-run this generation step via go run, and then check that git status --porcelain is the empty string (else fail the build)

Makes things a little less fragile.

Happy to help flesh this out further if it sounds reasonable?

Done!

We can automate later if needed—it's not worth all the extra machinery overhead now.

I don't think the extra machinery creates that much overhead; I just fleshed out what I outlined above:

#765

And the benefit is that it saves having to manually re-run minification at all.