Function spawnCapture

scripts/benchmark-utils.mjs:154–190

(command, args, options = {})

}

export function spawnCapture(command, args, options = {}) {
  return new Promise((resolve, reject) => {
    const child = spawn(command, args, {
      cwd: options.cwd,
      shell: false,
      stdio: ['pipe', 'pipe', 'pipe'],
    });
    let stdout = '';
    let stderr = '';
    const timer = options.timeoutMs
      ? setTimeout(() => {
          child.kill('SIGTERM');
          reject(new Error(`Command timed out: ${command} ${args.join(' ')}`));
        }, options.timeoutMs)
      : null;
    child.stdout.on('data', (chunk) => {
      stdout += chunk.toString();
    });
    child.stderr.on('data', (chunk) => {
      stderr += chunk.toString();
    });
    child.on('error', (error) => {
      if (timer) clearTimeout(timer);
      reject(error);
    });
    child.on('close', (exitCode) => {
      if (timer) clearTimeout(timer);
      if (exitCode !== 0 && !options.allowFailure) {
        reject(new Error(`${command} exited ${exitCode}\n${stderr}`));
        return;
      }
      resolve({ stdout, stderr, exitCode });
    });
    if (options.input) child.stdin.end(options.input);
    else child.stdin.end();
  });
}

/**
 * Parse Claude Code JSON output (--output-format json).