Script to migrate to pnpm

to-pnpm.mjs

#!/bin/env node
import { existsSync } from 'fs'
import fs from 'fs/promises'
import path from 'path'
import { execSync } from 'child_process'

const LATEST_PNPM = '6.32.3'

const dir = path.resolve(process.argv[2] || '.')
const resolve = (...p) => path.resolve(dir, ...p)
const run = cmd => { execSync(cmd, { stdio: 'inherit', cwd: dir }) }

const remove = async (p) => {
  if (!existsSync(p)) { return }
  console.log('Removing', p)
  await fs.rm(resolve(p), { recursive: true }).catch(() => {})
}

console.log('Migrating to pnpm in', dir)

// Remove lock files and node_modules
await remove('yarn.lock')
await remove('package-lock.json')
await remove('.yarn')
await remove('node_modules')

// Update package.json scripts and add packageManager
const pkg = JSON.parse(await fs.readFile(resolve('package.json')))
if (pkg.scripts) {
  for (const scriptName in pkg.scripts) {
    pkg.scripts[scriptName] = pkg.scripts[scriptName]
    .replace(/yarn|^npm|(?<= )npm/g, 'pnpm')
  }
}
pkg.packageManager = `pnpm@${LATEST_PNPM}`
console.log('Updating package.json...')
await fs.writeFile(resolve('package.json'), JSON.stringify(pkg, null, 2))

// Install
run('corepack enable')
run('pnpm i')

console.log('Reminder: Please manually ensure all references to yarn and npm are removed from github actions and README.md')