Polyfills the latest ResizeObserver API. 

Polyfills the ResizeObserver API and supports box size options from the latest spec

trem

@juggle/resize-observer

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    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :

    typeof define === 'function' && define.amd ? define(['exports'], factory) :

    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.window = global.window || {}));

}(this, (function (exports) { 'use strict';

    (function (ResizeObserverBoxOptions) {

        ResizeObserverBoxOptions["BORDER_BOX"] = "border-box";

        ResizeObserverBoxOptions["CONTENT_BOX"] = "content-box";

        ResizeObserverBoxOptions["DEVICE_PIXEL_CONTENT_BOX"] = "device-pixel-content-box";

    })(ResizeObserverBoxOptions || (ResizeObserverBoxOptions = {}));

    var freeze = function (obj) { return Object.freeze(obj); };

    var ResizeObserverSize = (function () {

        function ResizeObserverSize(inlineSize, blockSize) {

            this.inlineSize = inlineSize;

        function DOMRectReadOnly(x, y, width, height) {

            this.bottom = this.top + this.height;

            this.right = this.left + this.width;

        DOMRectReadOnly.prototype.toJSON = function () {

            var _a = this, x = _a.x, y = _a.y, top = _a.top, right = _a.right, bottom = _a.bottom, left = _a.left, width = _a.width, height = _a.height;

            return { x: x, y: y, top: top, right: right, bottom: bottom, left: left, width: width, height: height };

        DOMRectReadOnly.fromRect = function (rectangle) {

            return new DOMRectReadOnly(rectangle.x, rectangle.y, rectangle.width, rectangle.height);

        return target instanceof SVGElement && 'getBBox' in target;

            var _a = target.getBBox(), width = _a.width, height = _a.height;

        var _b = target, offsetWidth = _b.offsetWidth, offsetHeight = _b.offsetHeight;

        return !(offsetWidth || offsetHeight || target.getClientRects().length);

        var scope = (_b = (_a = obj) === null || _a === void 0 ? void 0 : _a.ownerDocument) === null || _b === void 0 ? void 0 : _b.defaultView;

        return !!(scope && obj instanceof scope.Element);

    var isReplacedElement = function (target) {

                if (target.type !== 'image') {

    var global = typeof window !== 'undefined' ? window : {};

    var IE = (/msie|trident/i).test(global.navigator && global.navigator.userAgent);

    var parseDimension = function (pixel) { return parseFloat(pixel || '0'); };

    var size = function (inlineSize, blockSize, switchSizes) {

        if (inlineSize === void 0) { inlineSize = 0; }

        if (blockSize === void 0) { blockSize = 0; }

        if (switchSizes === void 0) { switchSizes = false; }

        return new ResizeObserverSize((switchSizes ? blockSize : inlineSize) || 0, (switchSizes ? inlineSize : blockSize) || 0);

    var isKnownDocument = function (document) {

        return documents.indexOf(document) >= 0;

    var isKnownWindow = function (window) {

        return windows.indexOf(window) >= 0;

    var observerConfig = { attributes: true, characterData: true, childList: true, subtree: true };

    var handleEvent = function () { return observedElements && scheduler.schedule(); };

    var mo = new MutationObserver(handleEvent);

        var root = node.getRootNode ? node.getRootNode({ composed: node.nodeType === 11 }) : node.ownerDocument;

            return isDocument(root) ? root : getDocument(root);

            for (var _i = 0, windowEvents_1 = windowEvents; _i < windowEvents_1.length; _i++) {

                var event_1 = windowEvents_1[_i];

                window.addEventListener(event_1, handleEvent);

                window.addEventListener(event_1, handleEvent, true);

    var addDocument = function (document) {

        if (!isKnownDocument(document)) {

            for (var _i = 0, documentEvents_1 = documentEvents; _i < documentEvents_1.length; _i++) {

                var event_2 = documentEvents_1[_i];

                document.addEventListener(event_2, handleEvent);

                document.addEventListener(event_2, handleEvent, true);

            mo.observe(document, observerConfig);

    var observeElementTree = function (element) {

        var document = getDocument(element);

        var window = (_a = element.ownerDocument) === null || _a === void 0 ? void 0 : _a.defaultView;

            addDocument(window.document);

                window = window === window.parent ? null : window.parent;

            document = getDocument(document);

    var registerAddition = function (element) {

    var registerRemoval = function (element) {

    var getObservationIndex = function (observationTargets, target) {

        for (var i = 0; i < observationTargets.length; i += 1) {

            if (observationTargets[i].target === target) {

    var ResizeObserverController = (function () {

        function ResizeObserverController() {

        ResizeObserverController.connect = function (resizeObserver, callback) {

            var detail = new ResizeObserverDetail(resizeObserver, callback);

            observerMap.set(resizeObserver, detail);

        ResizeObserverController.observe = function (resizeObserver, target, options) {

            var detail = observerMap.get(resizeObserver);

            var firstObservation = detail.observationTargets.length === 0;

            if (getObservationIndex(detail.observationTargets, target) < 0) {

                firstObservation && resizeObservers.push(detail);

                detail.observationTargets.push(new ResizeObservation(target, options && options.box));

                registerAddition(target);

        ResizeObserverController.unobserve = function (resizeObserver, target) {

            var index = getObservationIndex(detail.observationTargets, target);

            var lastObservation = detail.observationTargets.length === 1;

                lastObservation && resizeObservers.splice(resizeObservers.indexOf(detail), 1);

                detail.observationTargets.splice(index, 1);

        ResizeObserverController.disconnect = function (resizeObserver) {

            detail.observationTargets.slice().forEach(function (ot) { return _this.unobserve(resizeObserver, ot.target); });

            detail.activeTargets.splice(0, detail.activeTargets.length);

        function ResizeObserver(callback) {

            if (arguments.length === 0) {

                throw new TypeError("Failed to construct 'ResizeObserver': 1 argument required, but only 0 present.");

            if (typeof callback !== 'function') {

                throw new TypeError("Failed to construct 'ResizeObserver': The callback provided as parameter 1 is not a function.");

            ResizeObserverController.connect(this, callback);

		{
		"name": "@juggle/resize-observer",
		"version": "4.0.0-3",
		"version": "4.0.0-4",
		"description": "Polyfills the latest ResizeObserver API",
		@@ -5,0 +5,0 @@ "main": "./lib/resize-observer.js",

		@@ -408,10 +408,4 @@ (function (global, factory) {
		var observedElements = 0;
		var documents = [];
		var windows = [];
		var isKnownDocument = function (document) {
		return documents.indexOf(document) >= 0;
		};
		var isKnownWindow = function (window) {
		return windows.indexOf(window) >= 0;
		};
		var documents = new WeakMap();
		var windows = new WeakMap();
		var observerConfig = { attributes: true, characterData: true, childList: true, subtree: true };
		@@ -428,7 +422,7 @@ var handleEvent = function () { return observedElements && scheduler.schedule(); };
		var addWindow = function (window) {
		if (!isKnownWindow(window)) {
		windows.push(window);
		if (!windows.has(window)) {
		windows.set(window, 1);
		for (var _i = 0, windowEvents_1 = windowEvents; _i < windowEvents_1.length; _i++) {
		var event_1 = windowEvents_1[_i];
		window.addEventListener(event_1, handleEvent);
		window.addEventListener(event_1, handleEvent, true);
		}
		@@ -438,7 +432,7 @@ }
		var addDocument = function (document) {
		if (!isKnownDocument(document)) {
		documents.push(document);
		if (!documents.has(document)) {
		documents.set(document, 1);
		for (var _i = 0, documentEvents_1 = documentEvents; _i < documentEvents_1.length; _i++) {
		var event_2 = documentEvents_1[_i];
		document.addEventListener(event_2, handleEvent);
		document.addEventListener(event_2, handleEvent, true);
		}
		@@ -445,0 +439,0 @@ mo.observe(document, observerConfig);

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