Migrating from pnpm to bun sped up build time by 70.59%!!

This blog used yarn -> pnpm -> bun.

After migrating to bun, I got a 70%+ speed increase after bun v1.3.

Note that we broke live reloads on my markdown, so i had to manually refresh the page using API calls:

import type { NextApiRequest, NextApiResponse } from 'next';
// Store connected clients
const clients: NextApiResponse[] = [];
export default function handler(req: NextApiRequest, res: NextApiResponse) {
  // Set CORS headers for development
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'GET,OPTIONS');
  res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
  if (req.method === 'OPTIONS') {
    return res.status(200).end();
  }
  // Handle SSE client connections
  if (req.query.subscribe === 'true') {
    res.writeHead(200, {
      'Content-Type': 'text/event-stream',
      'Cache-Control': 'no-cache, no-transform',
      'Connection': 'keep-alive',
    });
    res.write('event: connected\n');
    res.write('data: true\n\n');
    clients.push(res);
    req.on('close', () => {
      clients.splice(clients.indexOf(res), 1);
    });
    return; // Important: don't send any more headers or end the response
  }
  // Handle incoming refresh signals from watch-md.js
  if (req.method === 'GET') {
    clients.forEach(client => {
      client.write('event: refresh\n');
      client.write('data: true\n\n');
    });
    return res.status(200).json({ message: 'Refresh signal broadcasted' });
  }
  res.status(404).end();
}

There were also problems with how Uint8Array works, so it was not a drop in replacement (unfortunately):

Hope this helps others on their bun migrations.