Function benchmark

bench/bench.js:27–56

(setup, action, tearDown = () => {})

// Benchmark running an action n times.
async function benchmark(setup, action, tearDown = () => {}) {
  __benchmarkResults = [];

  console.time("setup");
  await setup();
  console.timeEnd("setup");

  // Warm up the JIT.
  console.time("warmup");
  for (let i = 0; i < WARM_UP_ITERATIONS; i++) {
    await action();
    await yieldForTick();
  }
  console.timeEnd("warmup");

  const stats = new Stats("ms");

  for (let i = 0; i < BENCH_ITERATIONS; i++) {
    console.time("iteration");
    const thisIterationStart = now();
    await action();
    stats.take(now() - thisIterationStart);
    console.timeEnd("iteration");

    await yieldForTick();
  }

  await tearDown();
  return stats;
}

async function getTestMapping() {
  let smc = await new sourceMap.SourceMapConsumer(testSourceMap);