Function inlineStaticEnv

packages/next/src/lib/inline-static-env.ts:12–120

({
  distDir,
  config,
}: {
  distDir: string
  config: NextConfigComplete
})

const glob = promisify(globOriginal)

export async function inlineStaticEnv({
  distDir,
  config,
}: {
  distDir: string
  config: NextConfigComplete
}) {
  const nextConfigEnv = getNextConfigEnv(config)
  const staticEnv = getStaticEnv(config, config.deploymentId)

  const serverDir = path.join(distDir, 'server')
  const serverChunks = await glob('**/*.{js,json,js.map}', {
    cwd: serverDir,
  })
  const clientDir = path.join(distDir, 'static')
  const clientChunks = await glob('**/*.{js,json,js.map}', {
    cwd: clientDir,
  })
  const manifestChunks = await glob('*.{js,json,js.map}', {
    cwd: distDir,
  })

  const inlineSema = new Sema(8)
  const nextConfigEnvKeys = Object.keys(nextConfigEnv).map((item) =>
    item.split('process.env.').pop()
  )

  const builtRegEx = new RegExp(
    `[\\w]{1,}(\\.env)?\\.(?:NEXT_PUBLIC_[\\w]{1,}${nextConfigEnvKeys.length ? '|' + nextConfigEnvKeys.join('|') : ''})`,
    'g'
  )
  const changedClientFiles: Array<{ file: string; content: string }> = []
  const filesToCheck = new Set<string>(
    manifestChunks.map((f) => path.join(distDir, f))
  )

  for (const [parentDir, files] of [
    [serverDir, serverChunks],
    [clientDir, clientChunks],
  ] as const) {
    await Promise.all(
      files.map(async (file) => {
        await inlineSema.acquire()
        const filepath = path.join(parentDir, file)
        const content = await fs.promises.readFile(filepath, 'utf8')
        const newContent = content.replace(builtRegEx, (match) => {
          let normalizedMatch = `process.env.${match.split('.').pop()}`

          if (staticEnv[normalizedMatch]) {
            return JSON.stringify(staticEnv[normalizedMatch])
          }
          return match
        })

        await fs.promises.writeFile(filepath, newContent)

        if (content !== newContent && parentDir === clientDir) {
          changedClientFiles.push({ file, content: newContent })