[Bug]: output.filename.js is not working even when autoExtension is false

[xc2]

Version

System:
    OS: macOS 15.1
    CPU: (12) arm64 Apple M2 Max
    Memory: 53.33 MB / 32.00 GB
    Shell: 3.7.1 - /opt/homebrew/bin/fish
  Browsers:
    Chrome: 127.0.6533.120
  npmPackages:
    @rslib/core: 0.0.2 => 0.0.2

Details

import { defineConfig } from "@rslib/core";

export default defineConfig({
  source: {
    entry: {
      index: './src/index.ts',
    },
  },
  output: {
    distPath: {
      root: './dist'
    }
  },
  lib: [
    {
      format: "cjs",
      dts: { bundle: false },
      autoExtension: false,
      output: {
        filename: {
          js: '[name].cjs'
        }
      }
    },
    {
      format: "esm",
      dts: false,
    },
  ],
});

Reproduce link

Reproduce Steps

expected dist/index.cjs but got dist/index.js

[Timeless0911]

Got it, I will fix it.