Has anyone hit member-name minification breaking i...

# javascript

[Arthur Krukowski]

Has anyone hit member-name minification breaking in Kotlin/JS 2.4.20?

For a production library binary (js { binaries.library() }), non-exported fields and methods keep their original names on 2.4.20 but are minified on 2.4.10.

[Arthur Krukowski]

Here's how it looks and reproducible example.

Also tried freeCompilerArgs.add("-Xir-minimized-member-names=true") option, doesn't help

kjs-minimized-member-names.zip

[Arthur Krukowski]

In 2.4.20 notes, there's something about minimizer-webpack-plugin, but I don't configure terser-webpack-plugin directly

[broadway_lamb]

This definitely looks like a bug, can I ask you to file an issue please? kotl.in/issue

[Arthur Krukowski]

Yes, of course, will do it.

[Arthur Krukowski]

youtrack.jetbrains.com/issue/KT-89449/Member-names-no-longer-minified-in-production

[broadway_lamb]

Thank you!

[Robert Jaros]

I think it also makes bundle size larger with 2.4.20. I had already noticed a significant increase, but now, upon closer inspection, the library method names are clearly readable (whereas with 2.4.0 they weren't).

[Robert Jaros]

The same application bundle - old (120KB) and new (160KB).

[broadway_lamb]

We will try to fix this ASAP and land the fix in 2.4.21. Thank you for reporting.

[Edoardo Luppi]

Btw, this does not depend on Webpack, since it reproduces also on nodejs, which does not use it.
I think this is a (kinda) non-issue for nodejs() + binaries.library() producers, since an additional pass will be done via a bundler (e.g., ESBuild) most likely.

[Edoardo Luppi]

Will wait for 2.4.21 anyways tho, just to be able to properly compare outputs with 2.3.21.

[Edoardo Luppi]

I think this is a (kinda) non-issue for nodejs() + binaries.library() producers, since an additional pass will be done via a bundler

This is incorrect. Class properties aren't minified/mangled, so indeed it is an issue even for Node.js.