index.mjs

var resizeObservers = [];

var hasActiveObservations = function () {
    return resizeObservers.some(function (ro) { return ro.activeTargets.length > 0; });
};

var hasSkippedObservations = function () {
    return resizeObservers.some(function (ro) { return ro.skippedTargets.length > 0; });
};

var msg = 'ResizeObserver loop completed with undelivered notifications.';
var deliverResizeLoopError = function () {
    var event;
    if (typeof ErrorEvent === 'function') {
        event = new ErrorEvent('error', {
            message: msg
        });
    }
    else {
        event = document.createEvent('Event');
        event.initEvent('error', false, false);
        event.message = msg;
    }
    window.dispatchEvent(event);
};

var ResizeObserverBoxOptions;
(function (ResizeObserverBoxOptions) {
    ResizeObserverBoxOptions["BORDER_BOX"] = "border-box";
    ResizeObserverBoxOptions["CONTENT_BOX"] = "content-box";
    ResizeObserverBoxOptions["DEVICE_PIXEL_CONTENT_BOX"] = "device-pixel-content-box";
})(ResizeObserverBoxOptions || (ResizeObserverBoxOptions = {}));

var DOMRectReadOnly = (function () {
    function DOMRectReadOnly(x, y, width, height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
        this.top = this.y;
        this.left = this.x;
        this.bottom = this.top + this.height;
        this.right = this.left + this.width;
        return Object.freeze(this);
    }
    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 DOMRectReadOnly;
}());

var isSVG = function (target) { return target instanceof SVGElement && 'getBBox' in target; };
var isHidden = function (target) {
    if (isSVG(target)) {
        var _a = target.getBBox(), width = _a.width, height = _a.height;
        return !width && !height;
    }
    var _b = target, offsetWidth = _b.offsetWidth, offsetHeight = _b.offsetHeight;
    return !(offsetWidth || offsetHeight || target.getClientRects().length);
};
var isElement = function (obj) {
    var _a, _b;
    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) {
    switch (target.tagName) {
        case 'INPUT':
            if (target.type !== 'image') {
                break;
            }
        case 'VIDEO':
        case 'AUDIO':
        case 'EMBED':
        case 'OBJECT':
        case 'CANVAS':
        case 'IFRAME':
        case 'IMG':
            return true;
    }
    return false;
};

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

var cache = new Map();
var scrollRegexp = /auto|scroll/;
var verticalRegexp = /^tb|vertical/;
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 Object.freeze({
        inlineSize: (switchSizes ? blockSize : inlineSize) || 0,
        blockSize: (switchSizes ? inlineSize : blockSize) || 0
    });
};
var zeroBoxes = Object.freeze({
    devicePixelContentBoxSize: size(),
    borderBoxSize: size(),
    contentBoxSize: size(),
    contentRect: new DOMRectReadOnly(0, 0, 0, 0)
});
var calculateBoxSizes = function (target) {
    if (cache.has(target)) {
        return cache.get(target);
    }
    if (isHidden(target)) {
        cache.set(target, zeroBoxes);
        return zeroBoxes;
    }
    var cs = getComputedStyle(target);
    var svg = isSVG(target) && target.ownerSVGElement && target.getBBox();
    var removePadding = !IE && cs.boxSizing === 'border-box';
    var switchSizes = verticalRegexp.test(cs.writingMode || '');
    var canScrollVertically = !svg && scrollRegexp.test(cs.overflowY || '');
    var canScrollHorizontally = !svg && scrollRegexp.test(cs.overflowX || '');
    var paddingTop = svg ? 0 : parseDimension(cs.paddingTop);
    var paddingRight = svg ? 0 : parseDimension(cs.paddingRight);
    var paddingBottom = svg ? 0 : parseDimension(cs.paddingBottom);
    var paddingLeft = svg ? 0 : parseDimension(cs.paddingLeft);
    var borderTop = svg ? 0 : parseDimension(cs.borderTopWidth);
    var borderRight = svg ? 0 : parseDimension(cs.borderRightWidth);
    var borderBottom = svg ? 0 : parseDimension(cs.borderBottomWidth);
    var borderLeft = svg ? 0 : parseDimension(cs.borderLeftWidth);
    var horizontalPadding = paddingLeft + paddingRight;
    var verticalPadding = paddingTop + paddingBottom;
    var horizontalBorderArea = borderLeft + borderRight;
    var verticalBorderArea = borderTop + borderBottom;
    var horizontalScrollbarThickness = !canScrollHorizontally ? 0 : target.offsetHeight - verticalBorderArea - target.clientHeight;
    var verticalScrollbarThickness = !canScrollVertically ? 0 : target.offsetWidth - horizontalBorderArea - target.clientWidth;
    var widthReduction = removePadding ? horizontalPadding + horizontalBorderArea : 0;
    var heightReduction = removePadding ? verticalPadding + verticalBorderArea : 0;
    var contentWidth = svg ? svg.width : parseDimension(cs.width) - widthReduction - verticalScrollbarThickness;
    var contentHeight = svg ? svg.height : parseDimension(cs.height) - heightReduction - horizontalScrollbarThickness;
    var borderBoxWidth = contentWidth + horizontalPadding + verticalScrollbarThickness + horizontalBorderArea;
    var borderBoxHeight = contentHeight + verticalPadding + horizontalScrollbarThickness + verticalBorderArea;
    var boxes = Object.freeze({
        devicePixelContentBoxSize: size(Math.round(contentWidth * devicePixelRatio), Math.round(contentHeight * devicePixelRatio), switchSizes),
        borderBoxSize: size(borderBoxWidth, borderBoxHeight, switchSizes),
        contentBoxSize: size(contentWidth, contentHeight, switchSizes),
        contentRect: new DOMRectReadOnly(paddingLeft, paddingTop, contentWidth, contentHeight)
    });
    cache.set(target, boxes);
    return boxes;
};
var calculateBoxSize = function (target, observedBox) {
    var _a = calculateBoxSizes(target), borderBoxSize = _a.borderBoxSize, contentBoxSize = _a.contentBoxSize, devicePixelContentBoxSize = _a.devicePixelContentBoxSize;
    switch (observedBox) {
        case ResizeObserverBoxOptions.DEVICE_PIXEL_CONTENT_BOX:
            return devicePixelContentBoxSize;
        case ResizeObserverBoxOptions.BORDER_BOX:
            return borderBoxSize;
        default:
            return contentBoxSize;
    }
};

var ResizeObserverEntry = (function () {
    function ResizeObserverEntry(target) {
        var boxes = calculateBoxSizes(target);
        this.target = target;
        this.contentRect = boxes.contentRect;
        this.borderBoxSize = [boxes.borderBoxSize];
        this.contentBoxSize = [boxes.contentBoxSize];
        this.devicePixelContentBoxSize = [boxes.devicePixelContentBoxSize];
    }
    return ResizeObserverEntry;
}());

var calculateDepthForNode = function (node) {
    if (isHidden(node)) {
        return Infinity;
    }
    var depth = 0;
    var parent = node.parentNode;
    while (parent) {
        depth += 1;
        parent = parent.parentNode;
    }
    return depth;
};

var broadcastActiveObservations = function () {
    var shallowestDepth = Infinity;
    var callbacks = [];
    resizeObservers.forEach(function processObserver(ro) {
        if (ro.activeTargets.length === 0) {
            return;
        }
        var entries = [];
        ro.activeTargets.forEach(function processTarget(ot) {
            var entry = new ResizeObserverEntry(ot.target);
            var targetDepth = calculateDepthForNode(ot.target);
            entries.push(entry);
            ot.lastReportedSize = calculateBoxSize(ot.target, ot.observedBox);
            if (targetDepth < shallowestDepth) {
                shallowestDepth = targetDepth;
            }
        });
        callbacks.push(function resizeObserverCallback() {
            ro.callback.call(ro.observer, entries, ro.observer);
        });
        ro.activeTargets.splice(0, ro.activeTargets.length);
    });
    for (var _i = 0, callbacks_1 = callbacks; _i < callbacks_1.length; _i++) {
        var callback = callbacks_1[_i];
        callback();
    }
    return shallowestDepth;
};

var gatherActiveObservationsAtDepth = function (depth) {
    cache.clear();
    resizeObservers.forEach(function processObserver(ro) {
        ro.activeTargets.splice(0, ro.activeTargets.length);
        ro.skippedTargets.splice(0, ro.skippedTargets.length);
        ro.observationTargets.forEach(function processTarget(ot) {
            if (ot.isActive()) {
                if (calculateDepthForNode(ot.target) > depth) {
                    ro.activeTargets.push(ot);
                }
                else {
                    ro.skippedTargets.push(ot);
                }
            }
        });
    });
};

var process = function () {
    var depth = 0;
    gatherActiveObservationsAtDepth(depth);
    while (hasActiveObservations()) {
        depth = broadcastActiveObservations();
        gatherActiveObservationsAtDepth(depth);
    }
    if (hasSkippedObservations()) {
        deliverResizeLoopError();
    }
    return depth > 0;
};

var trigger;
var callbacks = [];
var notify = function () { return callbacks.splice(0).forEach(function (cb) { return cb(); }); };
var queueMicroTask = function (callback) {
    if (!trigger) {
        var el_1 = document.createTextNode('');
        var config = { characterData: true };
        new MutationObserver(function () { return notify(); }).observe(el_1, config);
        trigger = function () { el_1.textContent = ''; };
    }
    callbacks.push(callback);
    trigger();
};

var queueResizeObserver = function (cb) {
    queueMicroTask(function ResizeObserver() {
        requestAnimationFrame(cb);
    });
};

var watching = 0;
var isWatching = function () { return !!watching; };
var CATCH_FRAMES = 60 / 5;
var observerConfig = { attributes: true, characterData: true, childList: true, subtree: true };
var events = [
    'resize',
    'load',
    'transitionend',
    'animationend',
    'animationstart',
    'animationiteration',
    'keyup',
    'keydown',
    'mouseup',
    'mousedown',
    'mouseover',
    'mouseout',
    'blur',
    'focus'
];
var scheduled = false;
var Scheduler = (function () {
    function Scheduler() {
        var _this = this;
        this.stopped = true;
        this.listener = function () { return _this.schedule(); };
    }
    Scheduler.prototype.run = function (frames) {
        var _this = this;
        if (scheduled) {
            return;
        }
        scheduled = true;
        queueResizeObserver(function () {
            var elementsHaveResized = false;
            try {
                elementsHaveResized = process();
            }
            finally {
                scheduled = false;
                if (!isWatching()) {
                    return;
                }
                if (elementsHaveResized) {
                    _this.run(60);
                }
                else if (frames) {
                    _this.run(frames - 1);
                }
                else {
                    _this.start();
                }
            }
        });
    };
    Scheduler.prototype.schedule = function () {
        this.stop();
        this.run(CATCH_FRAMES);
    };
    Scheduler.prototype.observe = function () {
        var _this = this;
        var cb = function () { return _this.observer && _this.observer.observe(document.body, observerConfig); };
        document.body ? cb() : global.addEventListener('DOMContentLoaded', cb);
    };
    Scheduler.prototype.start = function () {
        var _this = this;
        if (this.stopped) {
            this.stopped = false;
            this.observer = new MutationObserver(this.listener);
            this.observe();
            events.forEach(function (name) { return global.addEventListener(name, _this.listener, true); });
        }
    };
    Scheduler.prototype.stop = function () {
        var _this = this;
        if (!this.stopped) {
            this.observer && this.observer.disconnect();
            events.forEach(function (name) { return global.removeEventListener(name, _this.listener, true); });
            this.stopped = true;
        }
    };
    return Scheduler;
}());
var scheduler = new Scheduler();
var updateCount = function (n) {
    !watching && n > 0 && scheduler.start();
    watching += n;
    !watching && scheduler.stop();
};

var skipNotifyOnElement = function (target) {
    return !isSVG(target)
        && !isReplacedElement(target)
        && getComputedStyle(target).display === 'inline';
};
var ResizeObservation = (function () {
    function ResizeObservation(target, observedBox) {
        this.target = target;
        this.observedBox = observedBox || ResizeObserverBoxOptions.CONTENT_BOX;
        this.lastReportedSize = {
            inlineSize: 0,
            blockSize: 0
        };
    }
    ResizeObservation.prototype.isActive = function () {
        var size = calculateBoxSize(this.target, this.observedBox);
        if (skipNotifyOnElement(this.target)) {
            this.lastReportedSize = size;
        }
        if (this.lastReportedSize.inlineSize !== size.inlineSize
            || this.lastReportedSize.blockSize !== size.blockSize) {
            return true;
        }
        return false;
    };
    return ResizeObservation;
}());

var ResizeObserverDetail = (function () {
    function ResizeObserverDetail(resizeObserver, callback) {
        this.activeTargets = [];
        this.skippedTargets = [];
        this.observationTargets = [];
        this.observer = resizeObserver;
        this.callback = callback;
    }
    return ResizeObserverDetail;
}());

var observerMap = new Map();
var getObservationIndex = function (observationTargets, target) {
    for (var i = 0; i < observationTargets.length; i += 1) {
        if (observationTargets[i].target === target) {
            return i;
        }
    }
    return -1;
};
var ResizeObserverController = (function () {
    function ResizeObserverController() {
    }
    ResizeObserverController.connect = function (resizeObserver, callback) {
        var detail = new ResizeObserverDetail(resizeObserver, callback);
        resizeObservers.push(detail);
        observerMap.set(resizeObserver, detail);
    };
    ResizeObserverController.observe = function (resizeObserver, target, options) {
        if (observerMap.has(resizeObserver)) {
            var detail = observerMap.get(resizeObserver);
            if (getObservationIndex(detail.observationTargets, target) < 0) {
                detail.observationTargets.push(new ResizeObservation(target, options && options.box));
                updateCount(1);
                scheduler.schedule();
            }
        }
    };
    ResizeObserverController.unobserve = function (resizeObserver, target) {
        if (observerMap.has(resizeObserver)) {
            var detail = observerMap.get(resizeObserver);
            var index = getObservationIndex(detail.observationTargets, target);
            if (index >= 0) {
                detail.observationTargets.splice(index, 1);
                updateCount(-1);
            }
        }
    };
    ResizeObserverController.disconnect = function (resizeObserver) {
        if (observerMap.has(resizeObserver)) {
            var detail = observerMap.get(resizeObserver);
            resizeObservers.splice(resizeObservers.indexOf(detail), 1);
            observerMap.delete(resizeObserver);
            updateCount(-detail.observationTargets.length);
        }
    };
    return ResizeObserverController;
}());

var ResizeObserver = (function () {
    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);
    }
    ResizeObserver.prototype.observe = function (target, options) {
        if (arguments.length === 0) {
            throw new TypeError("Failed to execute 'observe' on 'ResizeObserver': 1 argument required, but only 0 present.");
        }
        if (!isElement(target)) {
            throw new TypeError("Failed to execute 'observe' on 'ResizeObserver': parameter 1 is not of type 'Element");
        }
        ResizeObserverController.observe(this, target, options);
    };
    ResizeObserver.prototype.unobserve = function (target) {
        if (arguments.length === 0) {
            throw new TypeError("Failed to execute 'unobserve' on 'ResizeObserver': 1 argument required, but only 0 present.");
        }
        if (!isElement(target)) {
            throw new TypeError("Failed to execute 'unobserve' on 'ResizeObserver': parameter 1 is not of type 'Element");
        }
        ResizeObserverController.unobserve(this, target);
    };
    ResizeObserver.prototype.disconnect = function () {
        ResizeObserverController.disconnect(this);
    };
    ResizeObserver.toString = function () {
        return 'function ResizeObserver () { [polyfill code] }';
    };
    return ResizeObserver;
}());

function resize(node) {
  const ro = new ResizeObserver((entries, observer) => {
    node.dispatchEvent(new Event('resize'));
  });

  ro.observe(node);

  return {
    destroy() {
      ro.disconnect();
    }
  }
}

export default resize;