next.js/test/e2e/app-dir/edge-runtime-node-compatibility/pages/api/buffer.js

import B from 'node:buffer'
import B2 from 'buffer'
import { NextResponse } from 'next/server'

export const runtime = 'edge'

/**
 * @param {Request} req
 */
export default async function (req) {
  const text = await req.text()
  const buf = B.Buffer.from(text)
  return NextResponse.json({
    'Buffer === B.Buffer': B.Buffer === Buffer,
    'B2.Buffer === B.Buffer': B.Buffer === B2.Buffer,
    'typeof Buffer': typeof Buffer,
    'typeof B.Buffer': typeof B.Buffer,
    'typeof B2.Buffer': typeof B2.Buffer,
    encoded: buf.toString('base64'),
    exposedKeys: Object.keys(B),
  })
}