Function checkV8Flags

test/BenchmarkTestCases.benchmark.mjs:34–53

()

const REV_LIST_REGEXP = /^([a-f0-9]+)\s*([a-f0-9]+)\s*([a-f0-9]+)?\s*$/;

const checkV8Flags = () => {
	const requiredFlags = getV8Flags().filter(
		(flag) => !flag.startsWith("--max-old-space-size")
	);
	const actualFlags = process.execArgv;
	const missingFlags = requiredFlags.filter(
		(flag) => !actualFlags.includes(flag)
	);
	if (missingFlags.length > 0) {
		// Missing flags invalidate deterministic benchmarking (hash/random seeds,
		// GC scheduling, JIT). Throw instead of warning so CI and local runs can't
		// silently produce unstable numbers — use `yarn benchmark` to run with
		// the correct flags.
		throw new Error(
			`Missing required V8 flags for stable benchmarking: ${missingFlags.join(
				", "
			)}\nRun via \`yarn benchmark\` so the flags declared in package.json are applied.`
		);
	}
};

checkV8Flags();