index.js

//call the module
const looper = require('./looper')

//create an object to pass to the loop module
const loopOptions = {
	fn: () => Math.random(),
	max: 1e9
}

looper(loopOptions);

->//{ 'runtime(sec)': 29.4098592 }

looper.js

module.exports = function(object) {
	const { max = 1000000000n, fn } = object;
	let counter = 0;
	let running = true;
	Error.stackTraceLimit = 100;
	const A = (fn) => {
		fn();
		flipper = B;
	};
	const B = (fn) => {
		fn();
		flipper = A;
	};
	let flipper = B;
	const then = process.hrtime.bigint();
	do {
		counter++;
		if (counter > max) {
			const now = process.hrtime.bigint();
			const nanos = now - then;
			console.log({ 'runtime(sec)': Number(nanos) / 1000000000.0 });
			running = false;
		}
		flipper(fn);
		continue;
	} while (running);
};