@callstack/reassure-measure/lib/module/measure-function.js

Performance measurement library for React and React Native

import { config } from './config';
import { getCurrentTime, processRunResults } from './measure-helpers';
import { showFlagsOutputIfNeeded, writeTestStats } from './output';
export async function measureFunction(fn, options) {
  const stats = await measureFunctionInternal(fn, options);
  if (options?.writeFile !== false) {
    await writeTestStats(stats, 'function');
  }
  return stats;
}
async function measureFunctionInternal(fn, options) {
  const runs = options?.runs ?? config.runs;
  const warmupRuns = options?.warmupRuns ?? config.warmupRuns;
  const removeOutliers = options?.removeOutliers ?? config.removeOutliers;
  showFlagsOutputIfNeeded();
  const runResults = [];
  for (let i = 0; i < runs + warmupRuns; i += 1) {
    await options?.beforeEach?.();
    const timeStart = getCurrentTime();
    fn();
    const timeEnd = getCurrentTime();
    await options?.afterEach?.();
    const duration = timeEnd - timeStart;
    runResults.push({
      duration,
      count: 1
    });
  }
  return processRunResults(runResults, {
    warmupRuns,
    removeOutliers
  });
}
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