[Feature]: readResource from NormalModule compilation hooks doesn't work

[Deku-nattsu]

System Info

System:
OS: macOS 15.7.1
CPU: (10) arm64 Apple M4
Memory: 96.72 MB / 16.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 20.19.4 - /Users/ayman/.nvm/versions/node/v20.19.4/bin/node
npm: 11.6.1 - /Users/ayman/.nvm/versions/node/v20.19.4/bin/npm
pnpm: 10.20.0 - /Users/ayman/.nvm/versions/node/v20.19.4/bin/pnpm
Watchman: 2025.07.28.00 - /opt/homebrew/bin/watchman
Browsers:
Chrome: 142.0.7444.162
Safari: 26.0.1
npmPackages:
@rspack/cli: ^1.6.0 => 1.6.0
@rspack/core: ^1.6.0 => 1.6.0

Details

i am trying to port custom file scheme handling logic to rspack but it fails. this works in webpack.

ERROR in custom:scheme-file
  × Module build failed:
  ╰─▶   × Reading from "custom:scheme-file" is not handled by plugins (Unhandled scheme).
        │ Rspack supports "data:" and "file:" URIs by default.
        │ You may need an additional plugin to handle "custom:" URIs.

Reproduce link

https://github.com/Deku-nattsu/rspack-custom-scheme-repro

Reproduce Steps

npm run build

[SyMind]

Please provide complete use cases and purposes so that Rspack can evaluate whether and how to support other schemas.

[Deku-nattsu]

@SyMind i want to programatically load in memory compile time files without storing them to disk, this use case can be found in the internals of some frameworks like angular and ice

[SyMind]

@Deku-nattsu Oh, my bad. Rspack now supports custom schemas. Your issue is that you haven't handled normalModuleFactory.hooks.resolveForScheme.

[Deku-nattsu]

@SyMind webpack builds without the need of that hook, and what should i do in it exactly? anything i try results the same error in rspack

[SyMind]

@Deku-nattsu mentioned that Rspack currently has the readResource hook, but it hasn't actually been implemented to communicate with the Rust side. This issue should be considered a feature.

I'll explore whether and how to implement this hook.