'use strict';

exports.__esModule = true;
exports.removeResizeListener = exports.addResizeListener = undefined;

var _resizeObserverPolyfill = require('resize-observer-polyfill');

var _resizeObserverPolyfill2 = _interopRequireDefault(_resizeObserverPolyfill);

function _interopRequireDefault(obj) {
    return obj && obj.__esModule ? obj : {default: obj};
}

var isServer = typeof window === 'undefined';

/* istanbul ignore next */
var resizeHandler = function resizeHandler(entries) {
    for (var _iterator = entries, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator](); ;) {
        var _ref;

        if (_isArray) {
            if (_i >= _iterator.length) break;
            _ref = _iterator[_i++];
        } else {
            _i = _iterator.next();
            if (_i.done) break;
            _ref = _i.value;
        }

        var entry = _ref;

        var listeners = entry.target.__resizeListeners__ || [];
        if (listeners.length) {
            listeners.forEach(function (fn) {
                fn();
            });
        }
    }
};

/* istanbul ignore next */
var addResizeListener = exports.addResizeListener = function addResizeListener(element, fn) {
    if (isServer) return;
    if (!element.__resizeListeners__) {
        element.__resizeListeners__ = [];
        element.__ro__ = new _resizeObserverPolyfill2.default(resizeHandler);
        element.__ro__.observe(element);
    }
    element.__resizeListeners__.push(fn);
};

/* istanbul ignore next */
var removeResizeListener = exports.removeResizeListener = function removeResizeListener(element, fn) {
    if (!element || !element.__resizeListeners__) return;
    element.__resizeListeners__.splice(element.__resizeListeners__.indexOf(fn), 1);
    if (!element.__resizeListeners__.length) {
        element.__ro__.disconnect();
    }
};