Unexpected behaviour with `async` functions

[LukeSavefrogs]

When the testCondition callback is an async function, the waitUntil method returns immediately, without waiting at all.

The following fixes the problem by using an async function by default (needs to be tested):

const waitUntil = function (testCondition, timeout_ms = 30000, checkInterval_ms = 1000) {
	let start_ts = new Date().getTime();

	return new Promise((resolve, reject) => {
		let timer = setInterval(async () => {
			let elapsed_time: number = parseInt((new Date().getTime() - start_ts).toString());

			// Se il timeout è un numero
			if (
				!!timeout_ms &&
				!isNaN(timeout_ms) &&
				timeout_ms > 0 &&
				elapsed_time >= timeout_ms
			) {
				clearInterval(timer);
				reject(
					new Error(`Timeout of ${timeout_ms} ms exceeded (${elapsed_time} real)`)
				);
			}

			if (await testCondition()) {
				clearInterval(timer);
				resolve({
					msg:
						`The specified condition was met before the ${timeout_ms} ms timeout`,
					time: elapsed_time,
					given_timeout: timeout_ms,
				});
			}
		}, checkInterval_ms);
	});
}