Quick helper script to add `use client` to all ts/tsx files in all folders except when it was added already. (Thanks to Github Copilot for creating this.)

add-use-client-to-all-files.cjs

// 0. Stash everything in git to have a clean slate
// 1. Update `folderPath`
// 2. Run with `node add-use-client-to-all-files.cjs` from the root of your project

const fs = require('fs')
const path = require('path')

const folderPath = './src/app' // Replace with the path to your folder

function updateFilesInFolder(folderPath) {
  fs.readdir(folderPath, (err, files) => {
    if (err) {
      console.error(err)
      return
    }

    files.forEach((file) => {
      const filePath = path.join(folderPath, file)

      // Check if the file is a directory
      if (fs.statSync(filePath).isDirectory()) {
        // Recursively call the function for subdirectories
        updateFilesInFolder(filePath)
      } else if (path.extname(filePath) === '.ts' || path.extname(filePath) === '.tsx') {
        fs.readFile(filePath, 'utf8', (err, data) => {
          if (err) {
            console.error(err)
            return
          }

          if (data.includes('use client')) {
            console.log(`Skipped ${filePath}`)

            return
          }

          const newData = `'use client'\n\n${data}`

          fs.writeFile(filePath, newData, (err) => {
            if (err) {
              console.error(err)
              return
            }

            console.log(`Updated ${filePath}`)
          })
        })
      }
    })
  })
}

updateFilesInFolder(folderPath)