[Bug]: Angular bundle size 2x bigger than with Webpack

[edbzn]

System Info

System:
OS: Linux 5.15 Ubuntu 20.04.6 LTS (Focal Fossa)
CPU: (16) x64 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
Memory: 25.70 GB / 30.98 GB
Container: Yes
Shell: 5.8 - /usr/bin/zsh
Binaries:
Node: 20.11.0 - /usr/local/bin/node
Yarn: 1.22.19 - /usr/local/bin/yarn
npm: 10.2.4 - /usr/local/bin/npm
pnpm: 8.15.1 - /usr/local/bin/pnpm
bun: 1.0.22 - ~/.bun/bin/bun
Browsers:
Brave Browser: 121.1.62.165
Chrome: 121.0.6167.184
npmPackages:
@rspack/cli: ^0.6.3 => 0.6.3
@rspack/core: ^0.6.3 => 0.6.3

Details

Hi,

I'm trying Rspack with Angular, and all the critical features seem to be working. However, the bundle size generated by Rspack is 2x bigger than base builders. Here's the configuration I'm using. The generated main.js file is around 421K in my example against around 250K for Webpack or Esbuild. You can see the build logs here. Do you have an idea why, and how I can get approximatively the same bundle size?

Thanks!

Reproduce link

https://github.com/edbzn/ng-rspack/blob/main

Reproduce Steps

Rspack bundle size:

pnpm nx build && ls -lah dist/ng-rspack/rspack

Webpack bundle size:

pnpm nx build-wp && ls -lah dist/ng-rspack/webpack