[Feat Request] Support Rolldown Output Option codeSplitting or other ways to build multiple independent library files

[voidtan]

Describe the regression

Thanks for your works. I'm trying to create multiple library files within the same project, and I expect them to work independently wwithout relying on any other files and without including any import.
I consulted the documentation and attempted to use the new codeSplitting option provided in Rolldown, but my editor tells me this option doesn't exist in rolldownOptions.output.

Reproduction

https://stackblitz.com/edit/vitejs-rolldown-vite-n2d1qpvz

Expected Behavior

The build output consists only of liba.js and libb.js, without any other files. Either liba.js or libb.js contains all required code, so it can run correctly without relying on any other files or using any import statements.

Actual Behavior

The build output includes liba.js, libb.js, and the shared code file dist.js between them.

Steps to Reproduce

Run npm install followd by npm run build

System Info

System
    OS: Linux 5.0 undefined
    CPU: (3)x64 Intel(R) Core(TM) i9-9880H CPU @2.30GHz
    Memory: 0 Bytes/ 0 Bytes
    Shell: 1.0 - /bin/jsh
Binaries:
    Node: 20.19.1 -/usr/local/bin/node
    Yarn: 1.22.19-/usr/local/bin/yarn
    npm:  10.8.2 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
npmPackages:
    rolldown-vite: 7.3.1 => 7.3.1

Used Package Manager

npm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs and the Rolldown-related guide.
• Check that there isn't already an issue that reports the same regression to avoid creating a duplicate.
• Check that this is a concrete regression. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the regression.

[sapphi-red]

rolldown-vite is frozen and you need to use vite 8 beta to use the latest rolldown version.

That said, what you are trying to do does not require codeSplitting option. Also codeSplitting option does not support multiple inputs.
You can do it like this: https://stackblitz.com/edit/vitejs-rolldown-vite-crft7mnf?file=build.js