Function spawnProcess

benchmark/misc/startup-cli-version.js:24–48

(cli, bench, state)

});

function spawnProcess(cli, bench, state) {
  const cmd = process.execPath || process.argv[0];
  while (state.finished < state.n) {
    const child = spawnSync(cmd, [cli, '--version'], {
      env: { npm_config_loglevel: 'silent', ...process.env },
    });
    // Log some information for debugging if it fails, which it shouldn't.
    if (child.status !== 0) {
      console.log('---- STDOUT ----');
      console.log(child.stdout.toString());
      console.log('---- STDERR ----');
      console.log(child.stderr.toString());
      throw new Error(`Child process stopped with exit code ${child.status}`);
    }
    state.finished++;
    if (state.finished === 0) {
      // Finished warmup.
      bench.start();
    }

    if (state.finished === state.n) {
      bench.end(state.n);
    }
  }
}

function main({ n, cli }) {
  cli = path.resolve(__dirname, '../../', cli);