NCC consumes too much memory, can't be used with github pipelines

[Yehonal]

I'm using this command: ncc -m -s src/index.js to compile a large project in a single javascript bundle. However, it doesn't work in github pipelines since their containers are limited to 2 GB of ram causing a "memory heap" error during compilation.

I've tested locally by using this command: /usr/bin/time --format "%M" ncc -m -s src/index.js

And this is the result:

34630kB  env/dist/apps/manage-panel/bundle/index.js
90543kB  [146603ms] - ncc 0.31.1
4710052

4710052 -> It means that ncc consumes 4.7GB of ram to compile.

To reduce this amount I have to:

1. disable the cache (-500Mb)
2. disable the minification
3. disable the sourcemap

doing so, the memory consumed is 1.5GB (which is fine for github

By the way, despite cache that should be disabled in pipelines, minification and sourcemap together are consume way too much.
Is there a way to improve this?

[styfle]

This sounds like a duplicate of #596

[Yehonal]

Kind of, source map is the less problematic (it also adds ~500MB) but the minification adds ~3.5 GB

[styfle]

The minification currently uses terser, but we can look into using swc instead (experimental branch in #777)