@cantonjs/react-scroll-view/es/MapPolyfill.js

react scroll component using intersection observer API

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

import { createId } from './util';

var MapPolyfill = function () {
	function MapPolyfill() {
		_classCallCheck(this, MapPolyfill);

		this._store = [];
		this._key = '__map' + createId();
	}

	_createClass(MapPolyfill, [{
		key: 'has',
		value: function has(obj) {
			return !!~this._store.indexOf(obj);
		}
	}, {
		key: 'set',
		value: function set(obj, val) {
			if (!this.has(obj)) {
				obj[this._key] = val;
				this._store.push(obj);
			}
		}
	}, {
		key: 'get',
		value: function get(obj) {
			if (this.has(obj)) return obj[this._key];
		}
	}, {
		key: 'delete',
		value: function _delete(obj) {
			var index = this._store.indexOf(obj);
			if (index > -1) {
				delete obj[this._key];
				this._store.splice(index, 1);
			}
		}
	}, {
		key: 'size',
		get: function get() {
			return this._store.length;
		}
	}]);

	return MapPolyfill;
}();

export default Map || MapPolyfill;