[Bug]: rspack serve fails with InvalidArg if Rule.options has function in it

[skoch13]

System Info

System:
OS: macOS 15.0.1
CPU: (10) arm64 Apple M1 Max
Memory: 1.92 GB / 32.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 20.16.0 - ~/.local/state/fnm_multishells/79899_1729519945071/bin/node
npm: 10.8.1 - ~/.local/state/fnm_multishells/79899_1729519945071/bin/npm
pnpm: 9.12.2 - ~/.local/state/fnm_multishells/79899_1729519945071/bin/pnpm
Browsers:
Chrome: 130.0.6723.59
Safari: 18.0.1
npmPackages:
@rspack/cli: 1.0.13 => 1.0.13
@rspack/core: 1.0.13 => 1.0.13
@rspack/plugin-react-refresh: 1.0.0 => 1.0.0

Details

In attempt to migrate from webpack I stumbled upon the following error that is a little bit hard to trace, but the root cause is the following:

ts-loader allows to provide options.getCustomTransformers as function.

  {
    test: /\.tsx?$/,
    loader: 'builtin:swc-loader',
    type: 'javascript/auto',
    options: {
      getCustomTransformers: () => {}
...
...

Starting the web server results in the following error:

/Users/user/PATH/node_modules/.pnpm/@rspack+core@1.0.13/node_modules/@rspack/core/dist/index.js:17883
    this.#instance = new instanceBinding.Rspack(
                     ^
Error: JS functions cannot be represented as a serde_json::Value
    at _Compiler.#getInstance (/Users/user/PATH/node_modules/.pnpm/@rspack+core@1.0.13/node_modules/@rspack/core/dist/index.js:17883:22)
    at _Compiler.#build (/Users/user/PATH/node_modules/.pnpm/@rspack+core@1.0.13/node_modules/@rspack/core/dist/index.js:17330:22)
    at /Users/user/PATH/node_modules/.pnpm/@rspack+core@1.0.13/node_modules/@rspack/core/dist/index.js:17302:18
    at done (/Users/user/PATH/node_modules/.pnpm/@rspack+lite-tapable@1.0.1/node_modules/@rspack/lite-tapable/dist/index.js:473:13)
    at AsyncSeriesHook.callAsyncStageRange (/Users/user/PATH/node_modules/.pnpm/@rspack+lite-tapable@1.0.1/node_modules/@rspack/lite-tapable/dist/index.js:480:20)
    at AsyncSeriesHook.callAsync (/Users/user/PATH/node_modules/.pnpm/@rspack+lite-tapable@1.0.1/node_modules/@rspack/lite-tapable/dist/index.js:82:21)
    at _Compiler.compile (/Users/user/PATH/node_modules/.pnpm/@rspack+core@1.0.13/node_modules/@rspack/core/dist/index.js:17296:30)
    at /Users/user/PATH/node_modules/.pnpm/@rspack+core@1.0.13/node_modules/@rspack/core/dist/index.js:16733:21
    at done (/Users/user/PATH/node_modules/.pnpm/@rspack+lite-tapable@1.0.1/node_modules/@rspack/lite-tapable/dist/index.js:473:13)
    at next (/Users/user/PATH/node_modules/.pnpm/@rspack+lite-tapable@1.0.1/node_modules/@rspack/lite-tapable/dist/index.js:533:25) {
  code: 'InvalidArg'
}

Is it possible to improve error message here?

Reproduce link

https://github.com/skoch13/rspack-repro

Reproduce Steps

1. add function inside of Rule.options
2. execute rspack serve

or check repro at https://github.com/skoch13/rspack-repro

[inottn]

The builtin:swc-loader does not support the getCustomTransformers option. See https://rspack.dev/guide/features/builtin-swc-loader for more details.

[skoch13]

@inottn thank you for your reply. I did understand that eventually, but my question was, is it possible to improve error messaging here?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. If this issue is still affecting you, please leave any comment (for example, "bump"). We are sorry that we haven't been able to prioritize it yet. If you have any new additional information, please include it with your comment!