Convert back to CJS and use ncc.

rollup.cleanup.config.ts

@@ -1,19 +0,0 @@
-// See: https://rollupjs.org/introduction/
-
-import commonjs from '@rollup/plugin-commonjs'
-import json from '@rollup/plugin-json'
-import nodeResolve from '@rollup/plugin-node-resolve'
-import typescript from '@rollup/plugin-typescript'
-
-const config = {
-  input: 'src/cleanup.ts',
-  output: {
-    esModule: true,
-    file: 'dist/cleanup.js',
-    format: 'es',
-    sourcemap: true
-  },
-  plugins: [typescript(), nodeResolve(), commonjs(), json()]
-}
-
-export default config