@cantonjs/react-scroll-view/lib/util.js

react scroll component using intersection observer API

'use strict';

Object.defineProperty(exports, "__esModule", {
	value: true
});
exports.debounce = debounce;
exports.forwardRef = forwardRef;

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }

var iOSUserAgentRegExp = /(iphone|ipod|ipad)/i;
var isIOS = exports.isIOS = iOSUserAgentRegExp.test(navigator.userAgent);

var createId = exports.createId = function createId() {
	return (createId.id = (createId.id || 0) + 1).toString();
};

var noop = exports.noop = function noop() {};

function debounce(func, wait) {
	var timeoutId = void 0;
	var timestamp = void 0;
	var args = void 0;
	var result = void 0;

	var later = function later() {
		var last = Date.now() - timestamp;
		if (last < wait && last >= 0) {
			timeoutId = setTimeout(later, wait - last);
		} else {
			timeoutId = null;
			result = func.apply(undefined, _toConsumableArray(args));
			args = null;
		}
	};

	var debounced = function debounced() {
		for (var _len = arguments.length, latestArgs = Array(_len), _key = 0; _key < _len; _key++) {
			latestArgs[_key] = arguments[_key];
		}

		args = latestArgs;
		timestamp = Date.now();
		if (!timeoutId) {
			timeoutId = setTimeout(later, wait);
		}
		return result;
	};

	debounced.clearDebounce = function () {
		timeoutId && clearTimeout(timeoutId);
	};

	return debounced;
}

function forwardRef(ref, dom) {
	if (ref) {
		typeof ref === 'function' ? ref(dom) : ref.current = dom;
	}
}

var eventOptions = exports.eventOptions = function getEventOptions() {
	var passiveOptionSupported = false;
	var opts = Object.defineProperty({}, 'passive', {
		get: function get() {
			return passiveOptionSupported = true;
		}
	});
	try {
		window.addEventListener('test', null, opts);
	} catch (e) {}

	if (passiveOptionSupported) {
		return {
			passive: false,
			capture: false
		};
	}
	return false;
}();