Function runNextCommand

test/lib/next-test-utils.ts:290–399

(
  argv: string[],
  options: NextOptions = {}
)

}

export function runNextCommand(
  argv: string[],
  options: NextOptions = {}
): Promise<{
  code: number | null
  signal: NodeJS.Signals | null
  stdout: string
  stderr: string
}> {
  const nextDir = path.dirname(require.resolve('next/package'))
  const nextBin = path.join(nextDir, 'dist/bin/next')
  const cwd = options.cwd || nextDir
  // Let Next.js decide the environment
  const env: NodeJS.ProcessEnv = {
    ...process.env,
    // @ts-ignore packages/next/types/global.d.ts should allow undefined NODE_ENV
    NODE_ENV: undefined as NodeJS.ProcessEnv['NODE_ENV'],
    __NEXT_TEST_MODE: 'true',
    ...options.env,
  }

  return new Promise((resolve, reject) => {
    debugPrint(`Running command "next ${argv.join(' ')}"`)
    const instance = spawn(
      'node',
      [...(options.nodeArgs || []), '--no-deprecation', nextBin, ...argv],
      {
        ...options.spawnOptions,
        cwd,
        env,
        stdio: ['ignore', 'pipe', 'pipe'],
      }
    )

    if (typeof options.instance === 'function') {
      options.instance(instance)
    }

    let mergedStdio = ''

    let stderrOutput = ''
    if (options.stderr || options.onStderr) {
      instance.stderr!.on('data', function (chunk) {
        mergedStdio += chunk
        stderrOutput += chunk

        if (options.stderr === 'log') {
          debugPrint(chunk.toString())
        }
        if (typeof options.onStderr === 'function') {
          options.onStderr(chunk.toString())
        }
      })
    } else {
      instance.stderr!.on('data', function (chunk) {
        mergedStdio += chunk
      })
    }