Rollup does not exit

I use rollup to bundle typescript code, but it does not exit after the target file is generated.

I have the config like this

import rollupTypescript from '@rollup/plugin-typescript'
import css from 'rollup-plugin-css-only'

export default {
  input: 'src/index.ts',
  output: [
    {
      file: 'dist/index.iife.js',
      format: 'iife',
      name: 'plotter',
    },
  ],
  plugins: [
    rollupTypescript(),
    css({ ouput: 'dist/index/css' }),
  ],
}

And I can see the output as terminal

It tells that the file is created, but the rollup process does not exit.

Typescript: 4.4.2

Rollup: 2.26.4

@rollup/plugin-typescript: 8.2.5

Is there anything I did wrong? Thanks.