Function editFile

packages/vite/src/node/ssr/runtime/__tests__/utils.ts:120–124

(file, callback)

  return {
    editFile(file, callback) {
      const content = fs.readFileSync(file, 'utf-8')
      if (!originalFiles.has(file)) originalFiles.set(file, content)
      fs.writeFileSync(file, callback(content), 'utf-8')
    },
  }
}