Function timedAsync

scripts/experimental/swiftui-preview.mjs:242–247

(label, action)

    return result;
  };
  const timedAsync = async (label, action) => {
    const stageStarted = Date.now();
    const result = await action();
    timings.push([label, Date.now() - stageStarted]);
    return result;
  };
  const source = timed("read source", () =>
    fs.readFileSync(sourceFile, "utf8"),
  );