Function withLocalDev

packages/cli/test/dev/integration-4.test.ts:431–486

(
  fixtureName: string,
  fn: (port: number) => Promise<void>
)

);

function withLocalDev(
  fixtureName: string,
  fn: (port: number) => Promise<void>
) {
  return async () => {
    const cwd = join(__dirname, 'fixtures', fixtureName);
    const port = await getPort();
    let stdout = '';
    let stderr = '';

    await _execa('npm', ['install'], {
      cwd,
      shell: true,
      stdio: 'inherit',
    });

    const dev = _execa(
      binaryPath,
      ['dev', '--local', '--yes', '--listen', String(port)],
      {
        cwd,
        env: { ...process.env, __VERCEL_SKIP_DEV_CMD: '1' },
        reject: false,
        shell: true,
        stdio: 'pipe',
      }
    );

    dev.stdout?.setEncoding('utf8');
    dev.stderr?.setEncoding('utf8');
    dev.stdout?.on('data', chunk => {
      stdout += chunk;
    });
    dev.stderr?.on('data', chunk => {
      stderr += chunk;
    });

    try {
      await waitForReady(() => `${stdout}\n${stderr}`);
      await fn(port);
    } finally {
      if (dev.pid) {
        await nukeProcessTree(dev.pid);
      } else {
        dev.kill('SIGTERM', { forceKillAfterTimeout: 5000 });
      }
      await dev.catch(() => null);
    }

    if (dev.exitCode && dev.exitCode !== 0 && dev.exitCode !== 143) {
      throw new Error(
        `vc dev exited with ${dev.exitCode}:\n${stdout}\n${stderr}`
      );
    }
  };
}

async function waitForReady(readOutput: () => string) {