(function (global, factory) {
    factory(BI.Snabbdom = BI.Snabbdom || {});
})(this, function (exports) {
    'use strict';

    function createElement(tagName) {
        return document.createElement(tagName);
    }
    function createElementNS(namespaceURI, qualifiedName) {
        return document.createElementNS(namespaceURI, qualifiedName);
    }
    function createTextNode(text) {
        return document.createTextNode(text);
    }
    function createComment(text) {
        return document.createComment(text);
    }
    function insertBefore(parentNode, newNode, referenceNode) {
        parentNode.insertBefore(newNode, referenceNode);
    }
    function removeChild(node, child) {
        node.removeChild(child);
    }
    function appendChild(node, child) {
        node.appendChild(child);
    }
    function parentNode(node) {
        return node.parentNode;
    }
    function nextSibling(node) {
        return node.nextSibling;
    }
    function tagName(elm) {
        return elm.tagName;
    }
    function setTextContent(node, text) {
        node.textContent = text;
    }
    function getTextContent(node) {
        return node.textContent;
    }
    function isElement(node) {
        return node.nodeType === 1;
    }
    function isText(node) {
        return node.nodeType === 3;
    }
    function isComment(node) {
        return node.nodeType === 8;
    }
    var htmlDomApi = {
        createElement: createElement,
        createElementNS: createElementNS,
        createTextNode: createTextNode,
        createComment: createComment,
        insertBefore: insertBefore,
        removeChild: removeChild,
        appendChild: appendChild,
        parentNode: parentNode,
        nextSibling: nextSibling,
        tagName: tagName,
        setTextContent: setTextContent,
        getTextContent: getTextContent,
        isElement: isElement,
        isText: isText,
        isComment: isComment
    };

    function vnode(sel, data, children, text, elm) {
        var key = data === undefined ? undefined : data.key;
        return { sel: sel, data: data, children: children, text: text, elm: elm, key: key };
    }

    var array = Array.isArray;
    function primitive(s) {
        return typeof s === "string" || typeof s === "number";
    }

    function isUndef(s) {
        return s === undefined;
    }
    function isDef(s) {
        return s !== undefined;
    }
    var emptyNode = vnode("", {}, [], undefined, undefined);
    function sameVnode(vnode1, vnode2) {
        return vnode1.key === vnode2.key && vnode1.sel === vnode2.sel;
    }
    function isVnode(vnode) {
        return vnode.sel !== undefined;
    }
    function createKeyToOldIdx(children, beginIdx, endIdx) {
        var _a;
        var map = {};
        for (var i = beginIdx; i <= endIdx; ++i) {
            var key = (_a = children[i]) === null || _a === void 0 ? void 0 : _a.key;
            if (key !== undefined) {
                map[key] = i;
            }
        }
        return map;
    }
    var hooks = ["create", "update", "remove", "destroy", "pre", "post"];
    function init(modules, domApi) {
        var i = void 0;
        var j = void 0;
        var cbs = {
            create: [],
            update: [],
            remove: [],
            destroy: [],
            pre: [],
            post: []
        };
        var api = domApi !== undefined ? domApi : htmlDomApi;
        for (i = 0; i < hooks.length; ++i) {
            cbs[hooks[i]] = [];
            for (j = 0; j < modules.length; ++j) {
                var hook = modules[j][hooks[i]];
                if (hook !== undefined) {
                    cbs[hooks[i]].push(hook);
                }
            }
        }
        function emptyNodeAt(elm) {
            var id = elm.id ? "#" + elm.id : "";
            var c = elm.className ? "." + elm.className.split(" ").join(".") : "";
            return vnode(api.tagName(elm).toLowerCase() + id + c, {}, [], undefined, elm);
        }
        function createRmCb(childElm, listeners) {
            return function rmCb() {
                if (--listeners === 0) {
                    var parent = api.parentNode(childElm);
                    api.removeChild(parent, childElm);
                }
            };
        }
        function createElm(vnode, insertedVnodeQueue) {
            var _a, _b;
            var i = void 0;
            var data = vnode.data;
            if (data !== undefined) {
                var _init = (_a = data.hook) === null || _a === void 0 ? void 0 : _a.init;
                if (isDef(_init)) {
                    _init(vnode);
                    data = vnode.data;
                }
            }
            var children = vnode.children;
            var sel = vnode.sel;
            if (sel === "!") {
                if (isUndef(vnode.text)) {
                    vnode.text = "";
                }
                vnode.elm = api.createComment(vnode.text);
            } else if (sel !== undefined) {
                // Parse selector
                var hashIdx = sel.indexOf("#");
                var dotIdx = sel.indexOf(".", hashIdx);
                var hash = hashIdx > 0 ? hashIdx : sel.length;
                var dot = dotIdx > 0 ? dotIdx : sel.length;
                var tag = hashIdx !== -1 || dotIdx !== -1 ? sel.slice(0, Math.min(hash, dot)) : sel;
                var elm = vnode.elm = isDef(data) && isDef(i = data.ns) ? api.createElementNS(i, tag) : api.createElement(tag);
                if (hash < dot) elm.setAttribute("id", sel.slice(hash + 1, dot));
                if (dotIdx > 0) elm.setAttribute("class", sel.slice(dot + 1).replace(/\./g, " "));
                for (i = 0; i < cbs.create.length; ++i) {
                    cbs.create[i](emptyNode, vnode);
                }if (array(children)) {
                    for (i = 0; i < children.length; ++i) {
                        var ch = children[i];
                        if (ch != null) {
                            api.appendChild(elm, createElm(ch, insertedVnodeQueue));
                        }
                    }
                } else if (primitive(vnode.text)) {
                    api.appendChild(elm, api.createTextNode(vnode.text));
                }
                var _hook = vnode.data.hook;
                if (isDef(_hook)) {
                    (_b = _hook.create) === null || _b === void 0 ? void 0 : _b.call(_hook, emptyNode, vnode);
                    if (_hook.insert) {
                        insertedVnodeQueue.push(vnode);
                    }
                }
            } else {
                vnode.elm = api.createTextNode(vnode.text);
            }
            return vnode.elm;
        }
        function addVnodes(parentElm, before, vnodes, startIdx, endIdx, insertedVnodeQueue) {
            for (; startIdx <= endIdx; ++startIdx) {
                var ch = vnodes[startIdx];
                if (ch != null) {
                    api.insertBefore(parentElm, createElm(ch, insertedVnodeQueue), before);
                }
            }
        }
        function invokeDestroyHook(vnode) {
            var _a, _b;
            var data = vnode.data;
            if (data !== undefined) {
                (_b = (_a = data === null || data === void 0 ? void 0 : data.hook) === null || _a === void 0 ? void 0 : _a.destroy) === null || _b === void 0 ? void 0 : _b.call(_a, vnode);
                for (var _i = 0; _i < cbs.destroy.length; ++_i) {
                    cbs.destroy[_i](vnode);
                }if (vnode.children !== undefined) {
                    for (var _j = 0; _j < vnode.children.length; ++_j) {
                        var child = vnode.children[_j];
                        if (child != null && typeof child !== "string") {
                            invokeDestroyHook(child);
                        }
                    }
                }
            }
        }
        function removeVnodes(parentElm, vnodes, startIdx, endIdx) {
            var _a, _b;
            for (; startIdx <= endIdx; ++startIdx) {
                var listeners = void 0;
                var rm = void 0;
                var ch = vnodes[startIdx];
                if (ch != null) {
                    if (isDef(ch.sel)) {
                        invokeDestroyHook(ch);
                        listeners = cbs.remove.length + 1;
                        rm = createRmCb(ch.elm, listeners);
                        for (var _i2 = 0; _i2 < cbs.remove.length; ++_i2) {
                            cbs.remove[_i2](ch, rm);
                        }var removeHook = (_b = (_a = ch === null || ch === void 0 ? void 0 : ch.data) === null || _a === void 0 ? void 0 : _a.hook) === null || _b === void 0 ? void 0 : _b.remove;
                        if (isDef(removeHook)) {
                            removeHook(ch, rm);
                        } else {
                            rm();
                        }
                    } else {
                        // Text node
                        api.removeChild(parentElm, ch.elm);
                    }
                }
            }
        }
        function updateChildren(parentElm, oldCh, newCh, insertedVnodeQueue) {
            var oldStartIdx = 0;
            var newStartIdx = 0;
            var oldEndIdx = oldCh.length - 1;
            var oldStartVnode = oldCh[0];
            var oldEndVnode = oldCh[oldEndIdx];
            var newEndIdx = newCh.length - 1;
            var newStartVnode = newCh[0];
            var newEndVnode = newCh[newEndIdx];
            var oldKeyToIdx = void 0;
            var idxInOld = void 0;
            var elmToMove = void 0;
            var before = void 0;
            while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
                if (oldStartVnode == null) {
                    oldStartVnode = oldCh[++oldStartIdx]; // Vnode might have been moved left
                } else if (oldEndVnode == null) {
                    oldEndVnode = oldCh[--oldEndIdx];
                } else if (newStartVnode == null) {
                    newStartVnode = newCh[++newStartIdx];
                } else if (newEndVnode == null) {
                    newEndVnode = newCh[--newEndIdx];
                } else if (sameVnode(oldStartVnode, newStartVnode)) {
                    patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
                    oldStartVnode = oldCh[++oldStartIdx];
                    newStartVnode = newCh[++newStartIdx];
                } else if (sameVnode(oldEndVnode, newEndVnode)) {
                    patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
                    oldEndVnode = oldCh[--oldEndIdx];
                    newEndVnode = newCh[--newEndIdx];
                } else if (sameVnode(oldStartVnode, newEndVnode)) {
                    // Vnode moved right
                    patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
                    api.insertBefore(parentElm, oldStartVnode.elm, api.nextSibling(oldEndVnode.elm));
                    oldStartVnode = oldCh[++oldStartIdx];
                    newEndVnode = newCh[--newEndIdx];
                } else if (sameVnode(oldEndVnode, newStartVnode)) {
                    // Vnode moved left
                    patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
                    api.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
                    oldEndVnode = oldCh[--oldEndIdx];
                    newStartVnode = newCh[++newStartIdx];
                } else {
                    if (oldKeyToIdx === undefined) {
                        oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx);
                    }
                    idxInOld = oldKeyToIdx[newStartVnode.key];
                    if (isUndef(idxInOld)) {
                        // New element
                        api.insertBefore(parentElm, createElm(newStartVnode, insertedVnodeQueue), oldStartVnode.elm);
                    } else {
                        elmToMove = oldCh[idxInOld];
                        if (elmToMove.sel !== newStartVnode.sel) {
                            api.insertBefore(parentElm, createElm(newStartVnode, insertedVnodeQueue), oldStartVnode.elm);
                        } else {
                            patchVnode(elmToMove, newStartVnode, insertedVnodeQueue);
                            oldCh[idxInOld] = undefined;
                            api.insertBefore(parentElm, elmToMove.elm, oldStartVnode.elm);
                        }
                    }
                    newStartVnode = newCh[++newStartIdx];
                }
            }
            if (oldStartIdx <= oldEndIdx || newStartIdx <= newEndIdx) {
                if (oldStartIdx > oldEndIdx) {
                    before = newCh[newEndIdx + 1] == null ? null : newCh[newEndIdx + 1].elm;
                    addVnodes(parentElm, before, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
                } else {
                    removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
                }
            }
        }
        function patchVnode(oldVnode, vnode, insertedVnodeQueue) {
            var _a, _b, _c, _d, _e;
            var hook = (_a = vnode.data) === null || _a === void 0 ? void 0 : _a.hook;
            (_b = hook === null || hook === void 0 ? void 0 : hook.prepatch) === null || _b === void 0 ? void 0 : _b.call(hook, oldVnode, vnode);
            var elm = vnode.elm = oldVnode.elm;
            var oldCh = oldVnode.children;
            var ch = vnode.children;
            if (oldVnode === vnode) return;
            if (vnode.data !== undefined) {
                for (var _i3 = 0; _i3 < cbs.update.length; ++_i3) {
                    cbs.update[_i3](oldVnode, vnode);
                }(_d = (_c = vnode.data.hook) === null || _c === void 0 ? void 0 : _c.update) === null || _d === void 0 ? void 0 : _d.call(_c, oldVnode, vnode);
            }
            if (isUndef(vnode.text)) {
                if (isDef(oldCh) && isDef(ch)) {
                    if (oldCh !== ch) updateChildren(elm, oldCh, ch, insertedVnodeQueue);
                } else if (isDef(ch)) {
                    if (isDef(oldVnode.text)) api.setTextContent(elm, "");
                    addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
                } else if (isDef(oldCh)) {
                    removeVnodes(elm, oldCh, 0, oldCh.length - 1);
                } else if (isDef(oldVnode.text)) {
                    api.setTextContent(elm, "");
                }
            } else if (oldVnode.text !== vnode.text) {
                if (isDef(oldCh)) {
                    removeVnodes(elm, oldCh, 0, oldCh.length - 1);
                }
                api.setTextContent(elm, vnode.text);
            }
            (_e = hook === null || hook === void 0 ? void 0 : hook.postpatch) === null || _e === void 0 ? void 0 : _e.call(hook, oldVnode, vnode);
        }
        return function patch(oldVnode, vnode) {
            var i = void 0,
                elm = void 0,
                parent = void 0;
            var insertedVnodeQueue = [];
            for (i = 0; i < cbs.pre.length; ++i) {
                cbs.pre[i]();
            }if (!isVnode(oldVnode)) {
                oldVnode = emptyNodeAt(oldVnode);
            }
            if (sameVnode(oldVnode, vnode)) {
                patchVnode(oldVnode, vnode, insertedVnodeQueue);
            } else {
                elm = oldVnode.elm;
                parent = api.parentNode(elm);
                createElm(vnode, insertedVnodeQueue);
                if (parent !== null) {
                    api.insertBefore(parent, vnode.elm, api.nextSibling(elm));
                    removeVnodes(parent, [oldVnode], 0, 0);
                }
            }
            for (i = 0; i < insertedVnodeQueue.length; ++i) {
                insertedVnodeQueue[i].data.hook.insert(insertedVnodeQueue[i]);
            }
            for (i = 0; i < cbs.post.length; ++i) {
                cbs.post[i]();
            }return vnode;
        };
    }

    function addNS(data, children, sel) {
        data.ns = "http://www.w3.org/2000/svg";
        if (sel !== "foreignObject" && children !== undefined) {
            for (var i = 0; i < children.length; ++i) {
                var childData = children[i].data;
                if (childData !== undefined) {
                    addNS(childData, children[i].children, children[i].sel);
                }
            }
        }
    }
    function h(sel, b, c) {
        var data = {};
        var children = void 0;
        var text = void 0;
        var i = void 0;
        if (c !== undefined) {
            if (b !== null) {
                data = b;
            }
            if (array(c)) {
                children = c;
            } else if (primitive(c)) {
                text = c;
            } else if (c && c.sel) {
                children = [c];
            }
        } else if (b !== undefined && b !== null) {
            if (array(b)) {
                children = b;
            } else if (primitive(b)) {
                text = b;
            } else if (b && b.sel) {
                children = [b];
            } else {
                data = b;
            }
        }
        if (children !== undefined) {
            for (i = 0; i < children.length; ++i) {
                if (primitive(children[i])) children[i] = vnode(undefined, undefined, undefined, children[i], undefined);
            }
        }
        if (sel[0] === "s" && sel[1] === "v" && sel[2] === "g" && (sel.length === 3 || sel[3] === "." || sel[3] === "#")) {
            addNS(data, children, sel);
        }
        return vnode(sel, data, children, text, undefined);
    }

    function copyToThunk(vnode, thunk) {
        vnode.data.fn = thunk.data.fn;
        vnode.data.args = thunk.data.args;
        thunk.data = vnode.data;
        thunk.children = vnode.children;
        thunk.text = vnode.text;
        thunk.elm = vnode.elm;
    }
    function init$1(thunk) {
        var cur = thunk.data;
        var vnode = cur.fn.apply(undefined, cur.args);
        copyToThunk(vnode, thunk);
    }
    function prepatch(oldVnode, thunk) {
        var i = void 0;
        var old = oldVnode.data;
        var cur = thunk.data;
        var oldArgs = old.args;
        var args = cur.args;
        if (old.fn !== cur.fn || oldArgs.length !== args.length) {
            copyToThunk(cur.fn.apply(undefined, args), thunk);
            return;
        }
        for (i = 0; i < args.length; ++i) {
            if (oldArgs[i] !== args[i]) {
                copyToThunk(cur.fn.apply(undefined, args), thunk);
                return;
            }
        }
        copyToThunk(oldVnode, thunk);
    }
    var thunk = function thunk(sel, key, fn, args) {
        if (args === undefined) {
            args = fn;
            fn = key;
            key = undefined;
        }
        return h(sel, {
            key: key,
            hook: { init: init$1, prepatch: prepatch },
            fn: fn,
            args: args
        });
    };

    function pre(vnode, newVnode) {
        var attachData = vnode.data.attachData;
        // Copy created placeholder and real element from old vnode
        newVnode.data.attachData.placeholder = attachData.placeholder;
        newVnode.data.attachData.real = attachData.real;
        // Mount real element in vnode so the patch process operates on it
        vnode.elm = vnode.data.attachData.real;
    }
    function post(_, vnode) {
        // Mount dummy placeholder in vnode so potential reorders use it
        vnode.elm = vnode.data.attachData.placeholder;
    }
    function destroy(vnode) {
        // Remove placeholder
        if (vnode.elm !== undefined) {
            vnode.elm.parentNode.removeChild(vnode.elm);
        }
        // Remove real element from where it was inserted
        vnode.elm = vnode.data.attachData.real;
    }
    function create(_, vnode) {
        var real = vnode.elm;
        var attachData = vnode.data.attachData;
        var placeholder = document.createElement("span");
        // Replace actual element with dummy placeholder
        // Snabbdom will then insert placeholder instead
        vnode.elm = placeholder;
        attachData.target.appendChild(real);
        attachData.real = real;
        attachData.placeholder = placeholder;
    }
    function attachTo(target, vnode) {
        if (vnode.data === undefined) vnode.data = {};
        if (vnode.data.hook === undefined) vnode.data.hook = {};
        var data = vnode.data;
        var hook = vnode.data.hook;
        data.attachData = { target: target, placeholder: undefined, real: undefined };
        hook.create = create;
        hook.prepatch = pre;
        hook.postpatch = post;
        hook.destroy = destroy;
        return vnode;
    }

    function toVNode(node, domApi) {
        var api = domApi !== undefined ? domApi : htmlDomApi;
        var text = void 0;
        if (api.isElement(node)) {
            var id = node.id ? "#" + node.id : "";
            var cn = node.getAttribute("class");
            var c = cn ? "." + cn.split(" ").join(".") : "";
            var sel = api.tagName(node).toLowerCase() + id + c;
            var attrs = {};
            var children = [];
            var name = void 0;
            var i = void 0,
                n = void 0;
            var elmAttrs = node.attributes;
            var elmChildren = node.childNodes;
            for (i = 0, n = elmAttrs.length; i < n; i++) {
                name = elmAttrs[i].nodeName;
                if (name !== "id" && name !== "class") {
                    attrs[name] = elmAttrs[i].nodeValue;
                }
            }
            for (i = 0, n = elmChildren.length; i < n; i++) {
                children.push(toVNode(elmChildren[i], domApi));
            }
            return vnode(sel, { attrs: attrs }, children, undefined, node);
        } else if (api.isText(node)) {
            text = api.getTextContent(node);
            return vnode(undefined, undefined, undefined, text, node);
        } else if (api.isComment(node)) {
            text = api.getTextContent(node);
            return vnode("!", {}, [], text, node);
        } else {
            return vnode("", {}, [], undefined, node);
        }
    }

    var xlinkNS = "http://www.w3.org/1999/xlink";
    var xmlNS = "http://www.w3.org/XML/1998/namespace";
    var colonChar = 58;
    var xChar = 120;
    function updateAttrs(oldVnode, vnode) {
        var key = void 0;
        var elm = vnode.elm;
        var oldAttrs = oldVnode.data.attrs;
        var attrs = vnode.data.attrs;
        if (!oldAttrs && !attrs) return;
        if (oldAttrs === attrs) return;
        oldAttrs = oldAttrs || {};
        attrs = attrs || {};
        // update modified attributes, add new attributes
        for (key in attrs) {
            var cur = attrs[key];
            var old = oldAttrs[key];
            if (old !== cur) {
                if (cur === true) {
                    elm.setAttribute(key, "");
                } else if (cur === false) {
                    elm.removeAttribute(key);
                } else {
                    if (key.charCodeAt(0) !== xChar) {
                        elm.setAttribute(key, cur);
                    } else if (key.charCodeAt(3) === colonChar) {
                        // Assume xml namespace
                        elm.setAttributeNS(xmlNS, key, cur);
                    } else if (key.charCodeAt(5) === colonChar) {
                        // Assume xlink namespace
                        elm.setAttributeNS(xlinkNS, key, cur);
                    } else {
                        elm.setAttribute(key, cur);
                    }
                }
            }
        }
        // remove removed attributes
        // use `in` operator since the previous `for` iteration uses it (.i.e. add even attributes with undefined value)
        // the other option is to remove all attributes with value == undefined
        for (key in oldAttrs) {
            if (!(key in attrs)) {
                elm.removeAttribute(key);
            }
        }
    }
    var attributesModule = { create: updateAttrs, update: updateAttrs };

    function updateClass(oldVnode, vnode) {
        var cur = void 0;
        var name = void 0;
        var elm = vnode.elm;
        var oldClass = oldVnode.data["class"];
        var klass = vnode.data["class"];
        if (!oldClass && !klass) return;
        if (oldClass === klass) return;
        oldClass = oldClass || {};
        klass = klass || {};
        for (name in oldClass) {
            if (oldClass[name] && !Object.prototype.hasOwnProperty.call(klass, name)) {
                // was `true` and now not provided
                elm.classList.remove(name);
            }
        }
        for (name in klass) {
            cur = klass[name];
            if (cur !== oldClass[name]) {
                elm.classList[cur ? "add" : "remove"](name);
            }
        }
    }
    var classModule = { create: updateClass, update: updateClass };

    var CAPS_REGEX = /[A-Z]/g;
    function updateDataset(oldVnode, vnode) {
        var elm = vnode.elm;
        var oldDataset = oldVnode.data.dataset;
        var dataset = vnode.data.dataset;
        var key = void 0;
        if (!oldDataset && !dataset) return;
        if (oldDataset === dataset) return;
        oldDataset = oldDataset || {};
        dataset = dataset || {};
        var d = elm.dataset;
        for (key in oldDataset) {
            if (!dataset[key]) {
                if (d) {
                    if (key in d) {
                        delete d[key];
                    }
                } else {
                    elm.removeAttribute("data-" + key.replace(CAPS_REGEX, "-$&").toLowerCase());
                }
            }
        }
        for (key in dataset) {
            if (oldDataset[key] !== dataset[key]) {
                if (d) {
                    d[key] = dataset[key];
                } else {
                    elm.setAttribute("data-" + key.replace(CAPS_REGEX, "-$&").toLowerCase(), dataset[key]);
                }
            }
        }
    }
    var datasetModule = { create: updateDataset, update: updateDataset };

    function invokeHandler(handler, vnode, event) {
        if (typeof handler === "function") {
            // call function handler
            handler.call(vnode, event, vnode);
        } else if (typeof handler === "object") {
            // call multiple handlers
            for (var i = 0; i < handler.length; i++) {
                invokeHandler(handler[i], vnode, event);
            }
        }
    }
    function handleEvent(event, vnode) {
        var name = event.type;
        var on = vnode.data.on;
        // call event handler(s) if exists
        if (on && on[name]) {
            invokeHandler(on[name], vnode, event);
        }
    }
    function createListener() {
        return function handler(event) {
            handleEvent(event, handler.vnode);
        };
    }
    function updateEventListeners(oldVnode, vnode) {
        var oldOn = oldVnode.data.on;
        var oldListener = oldVnode.listener;
        var oldElm = oldVnode.elm;
        var on = vnode && vnode.data.on;
        var elm = vnode && vnode.elm;
        var name = void 0;
        // optimization for reused immutable handlers
        if (oldOn === on) {
            return;
        }
        // remove existing listeners which no longer used
        if (oldOn && oldListener) {
            // if element changed or deleted we remove all existing listeners unconditionally
            if (!on) {
                for (name in oldOn) {
                    // remove listener if element was changed or existing listeners removed
                    oldElm.removeEventListener(name, oldListener, false);
                }
            } else {
                for (name in oldOn) {
                    // remove listener if existing listener removed
                    if (!on[name]) {
                        oldElm.removeEventListener(name, oldListener, false);
                    }
                }
            }
        }
        // add new listeners which has not already attached
        if (on) {
            // reuse existing listener or create new
            var listener = vnode.listener = oldVnode.listener || createListener();
            // update vnode for listener
            listener.vnode = vnode;
            // if element changed or added we add all needed listeners unconditionally
            if (!oldOn) {
                for (name in on) {
                    // add listener if element was changed or new listeners added
                    elm.addEventListener(name, listener, false);
                }
            } else {
                for (name in on) {
                    // add listener if new listener added
                    if (!oldOn[name]) {
                        elm.addEventListener(name, listener, false);
                    }
                }
            }
        }
    }
    var eventListenersModule = {
        create: updateEventListeners,
        update: updateEventListeners,
        destroy: updateEventListeners
    };

    var raf = typeof window !== "undefined" && window.requestAnimationFrame || setTimeout;
    var nextFrame = function nextFrame(fn) {
        raf(function () {
            raf(fn);
        });
    };
    function setNextFrame(obj, prop, val) {
        nextFrame(function () {
            obj[prop] = val;
        });
    }
    function getTextNodeRect(textNode) {
        var rect = void 0;
        if (document.createRange) {
            var range = document.createRange();
            range.selectNodeContents(textNode);
            if (range.getBoundingClientRect) {
                rect = range.getBoundingClientRect();
            }
        }
        return rect;
    }
    function calcTransformOrigin(isTextNode, textRect, boundingRect) {
        if (isTextNode) {
            if (textRect) {
                // calculate pixels to center of text from left edge of bounding box
                var relativeCenterX = textRect.left + textRect.width / 2 - boundingRect.left;
                var relativeCenterY = textRect.top + textRect.height / 2 - boundingRect.top;
                return relativeCenterX + "px " + relativeCenterY + "px";
            }
        }
        return "0 0"; // top left
    }
    function getTextDx(oldTextRect, newTextRect) {
        if (oldTextRect && newTextRect) {
            return oldTextRect.left + oldTextRect.width / 2 - (newTextRect.left + newTextRect.width / 2);
        }
        return 0;
    }
    function getTextDy(oldTextRect, newTextRect) {
        if (oldTextRect && newTextRect) {
            return oldTextRect.top + oldTextRect.height / 2 - (newTextRect.top + newTextRect.height / 2);
        }
        return 0;
    }
    function isTextElement(elm) {
        return elm.childNodes.length === 1 && elm.childNodes[0].nodeType === 3;
    }
    var removed = void 0;
    var created = void 0;
    function pre$1() {
        removed = {};
        created = [];
    }
    function create$1(oldVnode, vnode) {
        var hero = vnode.data.hero;
        if (hero && hero.id) {
            created.push(hero.id);
            created.push(vnode);
        }
    }
    function destroy$1(vnode) {
        var hero = vnode.data.hero;
        if (hero && hero.id) {
            var elm = vnode.elm;
            vnode.isTextNode = isTextElement(elm); // is this a text node?
            vnode.boundingRect = elm.getBoundingClientRect(); // save the bounding rectangle to a new property on the vnode
            vnode.textRect = vnode.isTextNode ? getTextNodeRect(elm.childNodes[0]) : null; // save bounding rect of inner text node
            var computedStyle = window.getComputedStyle(elm, undefined); // get current styles (includes inherited properties)
            vnode.savedStyle = JSON.parse(JSON.stringify(computedStyle)); // save a copy of computed style values
            removed[hero.id] = vnode;
        }
    }
    function post$1() {
        var i = void 0,
            id = void 0,
            newElm = void 0,
            oldVnode = void 0,
            oldElm = void 0,
            hRatio = void 0,
            wRatio = void 0,
            oldRect = void 0,
            newRect = void 0,
            dx = void 0,
            dy = void 0,
            origTransform = void 0,
            origTransition = void 0,
            newStyle = void 0,
            oldStyle = void 0,
            newComputedStyle = void 0,
            isTextNode = void 0,
            newTextRect = void 0,
            oldTextRect = void 0;
        for (i = 0; i < created.length; i += 2) {
            id = created[i];
            newElm = created[i + 1].elm;
            oldVnode = removed[id];
            if (oldVnode) {
                isTextNode = oldVnode.isTextNode && isTextElement(newElm); // Are old & new both text?
                newStyle = newElm.style;
                newComputedStyle = window.getComputedStyle(newElm, undefined); // get full computed style for new element
                oldElm = oldVnode.elm;
                oldStyle = oldElm.style;
                // Overall element bounding boxes
                newRect = newElm.getBoundingClientRect();
                oldRect = oldVnode.boundingRect; // previously saved bounding rect
                // Text node bounding boxes & distances
                if (isTextNode) {
                    newTextRect = getTextNodeRect(newElm.childNodes[0]);
                    oldTextRect = oldVnode.textRect;
                    dx = getTextDx(oldTextRect, newTextRect);
                    dy = getTextDy(oldTextRect, newTextRect);
                } else {
                    // Calculate distances between old & new positions
                    dx = oldRect.left - newRect.left;
                    dy = oldRect.top - newRect.top;
                }
                hRatio = newRect.height / Math.max(oldRect.height, 1);
                wRatio = isTextNode ? hRatio : newRect.width / Math.max(oldRect.width, 1); // text scales based on hRatio
                // Animate new element
                origTransform = newStyle.transform;
                origTransition = newStyle.transition;
                if (newComputedStyle.display === "inline") {
                    // inline elements cannot be transformed
                    newStyle.display = "inline-block"; // this does not appear to have any negative side effects
                }
                newStyle.transition = origTransition + "transform 0s";
                newStyle.transformOrigin = calcTransformOrigin(isTextNode, newTextRect, newRect);
                newStyle.opacity = "0";
                newStyle.transform = origTransform + "translate(" + dx + "px, " + dy + "px) " + "scale(" + 1 / wRatio + ", " + 1 / hRatio + ")";
                setNextFrame(newStyle, "transition", origTransition);
                setNextFrame(newStyle, "transform", origTransform);
                setNextFrame(newStyle, "opacity", "1");
                // Animate old element
                for (var key in oldVnode.savedStyle) {
                    // re-apply saved inherited properties
                    if (String(parseInt(key)) !== key) {
                        var ms = key.substring(0, 2) === "ms";
                        var moz = key.substring(0, 3) === "moz";
                        var webkit = key.substring(0, 6) === "webkit";
                        if (!ms && !moz && !webkit) {
                            // ignore prefixed style properties
                            oldStyle[key] = oldVnode.savedStyle[key];
                        }
                    }
                }
                oldStyle.position = "absolute";
                oldStyle.top = oldRect.top + "px"; // start at existing position
                oldStyle.left = oldRect.left + "px";
                oldStyle.width = oldRect.width + "px"; // Needed for elements who were sized relative to their parents
                oldStyle.height = oldRect.height + "px"; // Needed for elements who were sized relative to their parents
                oldStyle.margin = "0"; // Margin on hero element leads to incorrect positioning
                oldStyle.transformOrigin = calcTransformOrigin(isTextNode, oldTextRect, oldRect);
                oldStyle.transform = "";
                oldStyle.opacity = "1";
                document.body.appendChild(oldElm);
                setNextFrame(oldStyle, "transform", "translate(" + -dx + "px, " + -dy + "px) scale(" + wRatio + ", " + hRatio + ")"); // scale must be on far right for translate to be correct
                setNextFrame(oldStyle, "opacity", "0");
                oldElm.addEventListener("transitionend", function (ev) {
                    if (ev.propertyName === "transform") {
                        document.body.removeChild(ev.target);
                    }
                });
            }
        }
        removed = created = undefined;
    }
    var heroModule = {
        pre: pre$1,
        create: create$1,
        destroy: destroy$1,
        post: post$1
    };

    function updateProps(oldVnode, vnode) {
        var key = void 0;
        var cur = void 0;
        var old = void 0;
        var elm = vnode.elm;
        var oldProps = oldVnode.data.props;
        var props = vnode.data.props;
        if (!oldProps && !props) return;
        if (oldProps === props) return;
        oldProps = oldProps || {};
        props = props || {};
        for (key in props) {
            cur = props[key];
            old = oldProps[key];
            if (old !== cur && (key !== "value" || elm[key] !== cur)) {
                elm[key] = cur;
            }
        }
    }
    var propsModule = { create: updateProps, update: updateProps };

    // Bindig `requestAnimationFrame` like this fixes a bug in IE/Edge. See #360 and #409.
    var raf$1 = typeof window !== "undefined" && (window.requestAnimationFrame && window.requestAnimationFrame.bind(window)) || setTimeout;
    var nextFrame$1 = function nextFrame$1(fn) {
        raf$1(function () {
            raf$1(fn);
        });
    };
    var reflowForced = false;
    function setNextFrame$1(obj, prop, val) {
        nextFrame$1(function () {
            obj[prop] = val;
        });
    }
    function updateStyle(oldVnode, vnode) {
        var cur = void 0;
        var name = void 0;
        var elm = vnode.elm;
        var oldStyle = oldVnode.data.style;
        var style = vnode.data.style;
        if (!oldStyle && !style) return;
        if (oldStyle === style) return;
        oldStyle = oldStyle || {};
        style = style || {};
        var oldHasDel = "delayed" in oldStyle;
        for (name in oldStyle) {
            if (!style[name]) {
                if (name[0] === "-" && name[1] === "-") {
                    elm.style.removeProperty(name);
                } else {
                    elm.style[name] = "";
                }
            }
        }
        for (name in style) {
            cur = style[name];
            if (name === "delayed" && style.delayed) {
                for (var name2 in style.delayed) {
                    cur = style.delayed[name2];
                    if (!oldHasDel || cur !== oldStyle.delayed[name2]) {
                        setNextFrame$1(elm.style, name2, cur);
                    }
                }
            } else if (name !== "remove" && cur !== oldStyle[name]) {
                if (name[0] === "-" && name[1] === "-") {
                    elm.style.setProperty(name, cur);
                } else {
                    elm.style[name] = cur;
                }
            }
        }
    }
    function applyDestroyStyle(vnode) {
        var style = void 0;
        var name = void 0;
        var elm = vnode.elm;
        var s = vnode.data.style;
        if (!s || !(style = s.destroy)) return;
        for (name in style) {
            elm.style[name] = style[name];
        }
    }
    function applyRemoveStyle(vnode, rm) {
        var s = vnode.data.style;
        if (!s || !s.remove) {
            rm();
            return;
        }
        if (!reflowForced) {
            // eslint-disable-next-line @typescript-eslint/no-unused-expressions
            vnode.elm.offsetLeft;
            reflowForced = true;
        }
        var name = void 0;
        var elm = vnode.elm;
        var i = 0;
        var style = s.remove;
        var amount = 0;
        var applied = [];
        for (name in style) {
            applied.push(name);
            elm.style[name] = style[name];
        }
        var compStyle = getComputedStyle(elm);
        var props = compStyle["transition-property"].split(", ");
        for (; i < props.length; ++i) {
            if (applied.indexOf(props[i]) !== -1) amount++;
        }
        elm.addEventListener("transitionend", function (ev) {
            if (ev.target === elm) --amount;
            if (amount === 0) rm();
        });
    }
    function forceReflow() {
        reflowForced = false;
    }
    var styleModule = {
        pre: forceReflow,
        create: updateStyle,
        update: updateStyle,
        destroy: applyDestroyStyle,
        remove: applyRemoveStyle
    };

    exports.array = array;
    exports.attachTo = attachTo;
    exports.attributesModule = attributesModule;
    exports.classModule = classModule;
    exports.datasetModule = datasetModule;
    exports.eventListenersModule = eventListenersModule;
    exports.h = h;
    exports.heroModule = heroModule;
    exports.htmlDomApi = htmlDomApi;
    exports.init = init;
    exports.primitive = primitive;
    exports.propsModule = propsModule;
    exports.styleModule = styleModule;
    exports.thunk = thunk;
    exports.toVNode = toVNode;
    exports.vnode = vnode;

    exports.__esModule = true;
});