[Bug]: import.meta.webpackHot.accept not called when class changes

[dartess]

Version

System:
    OS: macOS 15.3.1
    CPU: (10) arm64 Apple M1 Pro
    Memory: 3.04 GB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Browsers:
    Brave Browser: 134.1.76.73
    Chrome: 134.0.6998.44
    Chrome Canary: 136.0.7054.0
    Edge: 111.0.1661.54
    Safari: 18.3
    Safari Technology Preview: 18.4
  npmPackages:
    @rsbuild/core: ^1.2.15 => 1.2.15 
    @rsbuild/plugin-react: ^1.1.1 => 1.1.1

Details

I want to listen for changes in a file using "import.meta.webpackHot.accept" and react to the changes.

However, when changing in the class code, nothing happens, as if the file does not change.

note "a": there is a workaround to make the system react to changes. for this it is enough to export an empty function next to the class. now I have to place such a hack in each file with a class.

note "b": I tried to reproduce the problem with rspack and it doesn't seem to reproduce the problem.

Reproduce link

https://github.com/dartess/rsbuild-class-hmr

Reproduce Steps

1. npm i
2. npm run dev:rsbuild
3. open http://localhost:3000/
4. change value in src/Features.ts
   expected result: console.log: changed!
   actual result: nothing.

for note "a": uncomment // export function hmrHack() {} and try again — everything works fine with this workaround.

[GRAMMAC1]

It seems that Rsbuild cannot detect file changes when only exporting one class. Adding an additional export can temporarily solve this problem.

For example

export const VERSION = 1;
export class Features {
  public value = "123";
  public version = VERSION;
}

It works 😁

[GRAMMAC1]

disable fastRefresh of Rsbuild React Plugin then HMR works fine.

[GRAMMAC1]

In test case disable fast refresh HMR still works, the file is in

https://github.com/web-infra-dev/rsbuild/blob/main/e2e/cases/react/disable-fast-refresh/rsbuild.config.ts

so its just a normal behavior rather than a bug in this case? @chenjiahan