Wait for certain conditions to arise before calling callback function, with wait interval and optional timeout

waitFor.js

function waitFor(condition, callback, waitMs = 100, timeoutMs = -1) {
  if (condition()) {
    callback();
  } else {
		let interval = setInterval(() => {
      if (condition()) {
        clearInterval(interval);
        callback();
      }
    }, waitMs);
		if(timeoutMs > 0) {
			setTimeout(() => {
				clearInterval(interval);
			}, timeoutMs);
		}
  }
}