[Bug]: When the "entry" is set to "library", the HRM cannot function properly

[tclxshunquan-wang]

System Info

System:
OS: macOS 26.0.1
CPU: (10) arm64 Apple M1 Max
Memory: 61.81 MB / 32.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 22.13.1 - /usr/local/node-v22.13.1/bin/node
Yarn: 4.10.3 - /opt/homebrew/bin/yarn
npm: 10.9.2 - /usr/local/node-v22.13.1/bin/npm
pnpm: 10.10.0 - /opt/homebrew/bin/pnpm
Browsers:
Chrome: 142.0.7444.60
Safari: 26.0.1
npmPackages:
@rspack/cli: ^1.5.6 => 1.6.0
@rspack/core: ^1.5.6 => 1.6.0
@rspack/plugin-react-refresh: ^1.5.1 => 1.5.2

Details

rspack config：

...
entry: {
    main: './src/main/index.tsx',
    library: {
      import: './src/library/index.tsx',
      library: {
        type: 'var',
        name: 'MyLibrary',
      },
    },
  },
...

When the "entry" is set to "library", the HRM cannot function properly. Is there a solution to this problem?

Reproduce link

https://github.com/tclxshunquan-wang/rspack-hmr-reproduction

Reproduce Steps

1、yarn
2、yarn dev
3、Modify the codes of the main and library modules, and observe the operation of HRM.

[tclxshunquan-wang]

npmPackages:
@rspack/cli: ^1.6.1 => 1.6.1
@rspack/core: ^1.6.1 => 1.6.1
@rspack/plugin-react-refresh: ^1.5.2 => 1.5.2

I have updated the relevant versions of rspack to the latest ones, but the same problem persists.

[tianyingchun]

how progress of this issue? any plan for this issue @chenjiahan

[stormslowly]

i will investigate it this week.

[stormslowly]

Currently, multi runtimes(use two entries output in the same page) is not supported in Rspack an or webpack.

A workaround is enable single runtime chunk.

optimization: {
  minimize: false,
  runtimeChunk: "single", // you can enable this dev only 
}

But there is bug with this workaround, it will be fixed soon here.

[stormslowly]

@tclxshunquan-wang
Please have a try rspack canary @rspack-canary/core: 1.6.6-canary-310775e8-20251127083855.
Remeber to enable single runtime chunk

how to use canary