docs: function entrifyFromPkg(dir, options) {
  
    // Find package.json files.
    const pkgPaths = glob.sync('**/package.json', { cwd: dir, nodir: true, absolute: true })
  
    pkgPaths.forEach((pkgPath) => {
      console.log('[entrify]', 'Found:', pkgPath)
      const pkg = require(pkgPath)
  
      // A package.json file should have a main entry.
      if (!pkg.main) {
        console.warn('[entrify]', pkgPath, 'does not have a main entry.')
        return
      }
  
      // The main entry should not point to an index.js file.
      if (pkg.main === 'index.js' || pkg.main === './index.js') {
        console.warn('[entrify]', pkgPath, 'main entry is index.js.')
        return
      }
  
      // Ensure the index.js file to create doesn't already exist.
      const pkgDir = path.dirname(pkgPath)
      const indexPath = `${pkgDir}/index.js`
  
      if (fs.existsSync(indexPath)) {
        console.warn('[entrify]', indexPath, 'already exists.')
        return
      }
  
      // Create an index.js file alongside the package.json.
      const name = camelize(path.basename(pkgDir))
      const main = pkg.main.startsWith('./') ? pkg.main : `./${pkg.main}`
  
      fs.writeFileSync(indexPath, indexTemplate(options.format, { name, main }))
      console.log('[entrify]', indexPath, 'created!')
  
      // Delete the package.json file.
      fs.unlinkSync(pkgPath)
      console.log('[entrify]', pkgPath, 'deleted!')
    })
  }