Reproduction link or steps

1. Open https://stackblitz.com/edit/github-xv4yss-lweea2?file=rolldown.config.mjs,src%2Fdynamic.js,src%2Fentry.js
2. npm run build runs automatically
3. dist/dynamic-B5a49wDx.js is an empty file and dist/entry.js imports it.

What is expected?

The empty dist/dynamic-B5a49wDx.js is removed and the import("./dynamic-B5a49wDx.js"); is replaced with Promise.resolve(). Even further, Promise.resolve() can be removed completely in this case because there's no side effect.

What is actually happening?

dist/dynamic-B5a49wDx.js is not removed and the dist/entry.js contains import("./dynamic-B5a49wDx.js");.

System Info

Stackblitz

  System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 18.20.3 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.2.3 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    rolldown: https://pkg.pr.new/rolldown@01cedb9 => 0.14.0

Any additional comments?

related to #2604, #2826