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

Performance measurement library for React and React Native

import * as fs from 'fs/promises';
import * as logger from '@callstack/reassure-logger';
import { config } from './config';
export async function writeTestStats(stats, type, outputFilePath = config.outputFile) {
  const name = expect.getState().currentTestName;
  const line = JSON.stringify({
    name,
    type,
    ...stats
  }) + '\n';
  try {
    await fs.appendFile(outputFilePath, line);
  } catch (error) {
    logger.error(`Error writing ${outputFilePath}`, error);
    throw error;
  }
}
export async function clearTestStats(outputFilePath = config.outputFile) {
  try {
    await fs.unlink(outputFilePath);
  } catch {
    logger.warn(`Cannot remove ${outputFilePath}. File doesn't exist or cannot be removed`);
  }
}
let hasShownFlagsOutput = false;
export function showFlagsOutputIfNeeded() {
  if (hasShownFlagsOutput) {
    return;
  }
  if (!global.gc) {
    logger.error('❌ Measure code is running under incorrect Node.js configuration.\n' + 'Performance test code should be run in Jest with certain Node.js flags to increase measurements stability.\n' + 'Make sure you use the Reassure CLI and run it using "reassure" command.');
  } else {
    logger.verbose('Measure code is running with correct Node.js configuration.');
  }
  hasShownFlagsOutput = true;
}
export function setHasShownFlagsOutput(value) {
  hasShownFlagsOutput = value;
}
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