TypeScript Passive Support Detection

passive-support.ts

/**
 * Safety detection for passive support
 * https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Safely_detecting_option_support
 */

initPassiveSupport = (): boolean => {
	let supported = false;
	let options = {};

	try {
		options = {
			get passive() {
				supported = true;
				return null;
			}
		};

		const callback = () => {
			return null;
		};

		window.addEventListener('TEST', callback, options);
		window.removeEventListener('TEST', callback, options);
	} catch (err) {
		supported = false;
	};

	return supported;
}