Reproduction link or steps

https://repl.rolldown.rs/#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

What is expected?

codeSplitting groups name function context should provide access to meta information passed from previous hooks.

What is actually happening?

meta is undefined.

System Info

System:
    OS: macOS 26.2
    CPU: (12) arm64 Apple M4 Pro
    Memory: 5.08 GB / 48.00 GB
    Shell: 3.7.1 - /opt/homebrew/bin/fish
  Binaries:
    Node: 24.11.1 - /Users/maieul/.local/state/fnm_multishells/76334_1774358139384/bin/node
    npm: 11.6.2 - /Users/maieul/.local/state/fnm_multishells/76334_1774358139384/bin/npm
    pnpm: 10.17.1 - /usr/local/bin/pnpm
    bun: 1.1.0 - /Users/maieul/.bun/bin/bun
  Browsers:
    Chrome: 146.0.7680.165
    Safari: 26.2

Any additional comments?

We use this in Qwik v1 with Rollup's manualChunks to group back related segments chunks together. With Vite 8 and Rolldown we had to create our own internal Map to keep the information we gather during the transform hook.

Edit: using rolldown 1.0.0-rc.10 because .11 and .12 are broken for me.