ESM-only build (#4227)

Co-authored-by: Link <link20050703@gmail.com>

scripts/fixCjsExtension.js

@@ -1,12 +0,0 @@
-import { readdir, readFile, rm, writeFile } from 'node:fs/promises'
-
-const files = await readdir('dist/cjs', { recursive: true })
-const promises = files
-  .filter((f) => f.endsWith('.js'))
-  .map(async (file) => {
-    const content = await readFile(`dist/cjs/${file}`, 'utf-8')
-    await rm(`dist/cjs/${file}`)
-    await writeFile(`dist/cjs/${file.slice(0, -3)}.cjs`, content.replace(/\.js(?!on)/g, '.cjs'))
-  })
-
-await Promise.all(promises)