reorganize files

web/static/libs/snabbdom/src/h.ts

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+import {vnode, VNode, VNodeData} from './vnode';
+export type VNodes = Array<VNode>;
+export type VNodeChildElement = VNode | string | number | undefined | null;
+export type ArrayOrElement<T> = T | T[];
+export type VNodeChildren = ArrayOrElement<VNodeChildElement>
+import * as is from './is';
+
+function addNS(data: any, children: VNodes | undefined, sel: string | undefined): void {
+  data.ns = 'http://www.w3.org/2000/svg';
+  if (sel !== 'foreignObject' && children !== undefined) {
+    for (let i = 0; i < children.length; ++i) {
+      let childData = children[i].data;
+      if (childData !== undefined) {
+        addNS(childData, (children[i] as VNode).children as VNodes, children[i].sel);
+      }
+    }
+  }
+}
+
+export function h(sel: string): VNode;
+export function h(sel: string, data: VNodeData): VNode;
+export function h(sel: string, children: VNodeChildren): VNode;
+export function h(sel: string, data: VNodeData, children: VNodeChildren): VNode;
+export function h(sel: any, b?: any, c?: any): VNode {
+  var data: VNodeData = {}, children: any, text: any, i: number;
+  if (c !== undefined) {
+    data = b;
+    if (is.array(c)) { children = c; }
+    else if (is.primitive(c)) { text = c; }
+    else if (c && c.sel) { children = [c]; }
+  } else if (b !== undefined) {
+    if (is.array(b)) { children = b; }
+    else if (is.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 (is.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);
+};
+export default h;

web/static/libs/snabbdom/src/helpers/attachto.ts

@@ -0,0 +1,64 @@
+import {VNode, VNodeData} from '../vnode';
+
+export interface AttachData {
+  [key: string]: any
+  [i: number]: any
+  placeholder?: any
+  real?: Node
+}
+
+interface VNodeDataWithAttach extends VNodeData {
+  attachData: AttachData
+}
+
+interface VNodeWithAttachData extends VNode {
+  data: VNodeDataWithAttach
+}
+
+function pre(vnode: VNodeWithAttachData, newVnode: VNodeWithAttachData): void {
+  const 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(_: any, vnode: VNodeWithAttachData): void {
+  // Mount dummy placeholder in vnode so potential reorders use it
+  vnode.elm = vnode.data.attachData.placeholder;
+}
+
+function destroy(vnode: VNodeWithAttachData): void {
+  // Remove placeholder
+  if (vnode.elm !== undefined) {
+    (vnode.elm.parentNode as HTMLElement).removeChild(vnode.elm);
+  }
+  // Remove real element from where it was inserted
+  vnode.elm = vnode.data.attachData.real;
+}
+
+function create(_: any, vnode: VNodeWithAttachData): void {
+  const real = vnode.elm, attachData = vnode.data.attachData;
+  const 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;
+}
+
+export function attachTo(target: Element, vnode: VNode): VNode {
+  if (vnode.data === undefined) vnode.data = {};
+  if (vnode.data.hook === undefined) vnode.data.hook = {};
+  const data = vnode.data;
+  const 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;
+};
+export default attachTo;

web/static/libs/snabbdom/src/hooks.ts

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+import {VNode} from './vnode';
+
+export type PreHook = () => any;
+export type InitHook = (vNode: VNode) => any;
+export type CreateHook = (emptyVNode: VNode, vNode: VNode) => any;
+export type InsertHook = (vNode: VNode) => any;
+export type PrePatchHook = (oldVNode: VNode, vNode: VNode) => any;
+export type UpdateHook = (oldVNode: VNode, vNode: VNode) => any;
+export type PostPatchHook = (oldVNode: VNode, vNode: VNode) => any;
+export type DestroyHook = (vNode: VNode) => any;
+export type RemoveHook = (vNode: VNode, removeCallback: () => void) => any;
+export type PostHook = () => any;
+
+export interface Hooks {
+  pre?: PreHook;
+  init?: InitHook;
+  create?: CreateHook;
+  insert?: InsertHook;
+  prepatch?: PrePatchHook;
+  update?: UpdateHook;
+  postpatch?: PostPatchHook;
+  destroy?: DestroyHook;
+  remove?: RemoveHook;
+  post?: PostHook;
+}

web/static/libs/snabbdom/src/htmldomapi.ts

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+export interface DOMAPI {
+  createElement: (tagName: any) => HTMLElement;
+  createElementNS: (namespaceURI: string, qualifiedName: string) => Element;
+  createTextNode: (text: string) => Text;
+  createComment: (text: string) => Comment;
+  insertBefore: (parentNode: Node, newNode: Node, referenceNode: Node | null) => void;
+  removeChild: (node: Node, child: Node) => void;
+  appendChild: (node: Node, child: Node) => void;
+  parentNode: (node: Node) => Node;
+  nextSibling: (node: Node) => Node;
+  tagName: (elm: Element) => string;
+  setTextContent: (node: Node, text: string | null) => void;
+  getTextContent: (node: Node) => string | null;
+  isElement: (node: Node) => node is Element;
+  isText: (node: Node) => node is Text;
+  isComment: (node: Node) => node is Comment;
+}
+
+function createElement(tagName: any): HTMLElement {
+  return document.createElement(tagName);
+}
+
+function createElementNS(namespaceURI: string, qualifiedName: string): Element {
+  return document.createElementNS(namespaceURI, qualifiedName);
+}
+
+function createTextNode(text: string): Text {
+  return document.createTextNode(text);
+}
+
+function createComment(text: string): Comment {
+  return document.createComment(text);
+}
+
+function insertBefore(parentNode: Node, newNode: Node, referenceNode: Node | null): void {
+  parentNode.insertBefore(newNode, referenceNode);
+}
+
+function removeChild(node: Node, child: Node): void {
+  node.removeChild(child);
+}
+
+function appendChild(node: Node, child: Node): void {
+  node.appendChild(child);
+}
+
+function parentNode(node: Node): Node | null {
+  return node.parentNode;
+}
+
+function nextSibling(node: Node): Node | null {
+  return node.nextSibling;
+}
+
+function tagName(elm: Element): string {
+  return elm.tagName;
+}
+
+function setTextContent(node: Node, text: string | null): void {
+  node.textContent = text;
+}
+
+function getTextContent(node: Node): string | null {
+  return node.textContent;
+}
+
+function isElement(node: Node): node is Element {
+  return node.nodeType === 1;
+}
+
+function isText(node: Node): node is Text {
+  return node.nodeType === 3;
+}
+
+function isComment(node: Node): node is Comment {
+  return node.nodeType === 8;
+}
+
+export const htmlDomApi = {
+  createElement,
+  createElementNS,
+  createTextNode,
+  createComment,
+  insertBefore,
+  removeChild,
+  appendChild,
+  parentNode,
+  nextSibling,
+  tagName,
+  setTextContent,
+  getTextContent,
+  isElement,
+  isText,
+  isComment,
+} as DOMAPI;
+
+export default htmlDomApi;

web/static/libs/snabbdom/src/is.ts

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+export const array = Array.isArray;
+export function primitive(s: any): s is (string | number) {
+  return typeof s === 'string' || typeof s === 'number';
+}

web/static/libs/snabbdom/src/modules/attributes.ts

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+import {VNode, VNodeData} from '../vnode';
+import {Module} from './module';
+
+// because those in TypeScript are too restrictive: https://github.com/Microsoft/TSJS-lib-generator/pull/237
+declare global {
+  interface Element {
+    setAttribute(name: string, value: string | number | boolean): void;
+    setAttributeNS(namespaceURI: string, qualifiedName: string, value: string | number | boolean): void;
+  }
+}
+
+export type Attrs = Record<string, string | number | boolean>
+
+const xlinkNS = 'http://www.w3.org/1999/xlink';
+const xmlNS = 'http://www.w3.org/XML/1998/namespace';
+const colonChar = 58;
+const xChar = 120;
+
+function updateAttrs(oldVnode: VNode, vnode: VNode): void {
+  var key: string, elm: Element = vnode.elm as Element,
+      oldAttrs = (oldVnode.data as VNodeData).attrs,
+      attrs = (vnode.data as VNodeData).attrs;
+
+  if (!oldAttrs && !attrs) return;
+  if (oldAttrs === attrs) return;
+  oldAttrs = oldAttrs || {};
+  attrs = attrs || {};
+
+  // update modified attributes, add new attributes
+  for (key in attrs) {
+    const cur = attrs[key];
+    const 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);
+    }
+  }
+}
+
+export const attributesModule = {create: updateAttrs, update: updateAttrs} as Module;
+export default attributesModule;

web/static/libs/snabbdom/src/modules/class.ts

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+import {VNode, VNodeData} from '../vnode';
+import {Module} from './module';
+
+export type Classes = Record<string, boolean>
+
+function updateClass(oldVnode: VNode, vnode: VNode): void {
+  var cur: any, name: string, elm: Element = vnode.elm as Element,
+      oldClass = (oldVnode.data as VNodeData).class,
+      klass = (vnode.data as VNodeData).class;
+
+  if (!oldClass && !klass) return;
+  if (oldClass === klass) return;
+  oldClass = oldClass || {};
+  klass = klass || {};
+
+  for (name in oldClass) {
+    if (!klass[name]) {
+      elm.classList.remove(name);
+    }
+  }
+  for (name in klass) {
+    cur = klass[name];
+    if (cur !== oldClass[name]) {
+      (elm.classList as any)[cur ? 'add' : 'remove'](name);
+    }
+  }
+}
+
+export const classModule = {create: updateClass, update: updateClass} as Module;
+export default classModule;

web/static/libs/snabbdom/src/modules/dataset.ts

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+import {VNode, VNodeData} from '../vnode';
+import {Module} from './module';
+
+export type Dataset = Record<string, string>;
+
+const CAPS_REGEX = /[A-Z]/g;
+
+function updateDataset(oldVnode: VNode, vnode: VNode): void {
+  let elm: HTMLElement = vnode.elm as HTMLElement,
+    oldDataset = (oldVnode.data as VNodeData).dataset,
+    dataset = (vnode.data as VNodeData).dataset,
+    key: string;
+
+  if (!oldDataset && !dataset) return;
+  if (oldDataset === dataset) return;
+  oldDataset = oldDataset || {};
+  dataset = dataset || {};
+  const 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]);
+      }
+    }
+  }
+}
+
+export const datasetModule = {create: updateDataset, update: updateDataset} as Module;
+export default datasetModule;

web/static/libs/snabbdom/src/modules/eventlisteners.ts

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+import {VNode, VNodeData} from '../vnode';
+import {Module} from './module';
+
+export type On = {
+  [N in keyof HTMLElementEventMap]?: (ev: HTMLElementEventMap[N]) => void
+} & {
+  [event: string]: EventListener
+};
+
+function invokeHandler(handler: any, vnode?: VNode, event?: Event): void {
+  if (typeof handler === "function") {
+    // call function handler
+    handler.call(vnode, event, vnode);
+  } else if (typeof handler === "object") {
+    // call handler with arguments
+    if (typeof handler[0] === "function") {
+      // special case for single argument for performance
+      if (handler.length === 2) {
+        handler[0].call(vnode, handler[1], event, vnode);
+      } else {
+        var args = handler.slice(1);
+        args.push(event);
+        args.push(vnode);
+        handler[0].apply(vnode, args);
+      }
+    } else {
+      // call multiple handlers
+      for (var i = 0; i < handler.length; i++) {
+        invokeHandler(handler[i], vnode, event);
+      }
+    }
+  }
+}
+
+function handleEvent(event: Event, vnode: VNode) {
+  var name = event.type,
+      on = (vnode.data as VNodeData).on;
+
+  // call event handler(s) if exists
+  if (on && on[name]) {
+    invokeHandler(on[name], vnode, event);
+  }
+}
+
+function createListener() {
+  return function handler(event: Event) {
+    handleEvent(event, (handler as any).vnode);
+  }
+}
+
+function updateEventListeners(oldVnode: VNode, vnode?: VNode): void {
+  var oldOn = (oldVnode.data as VNodeData).on,
+      oldListener = (oldVnode as any).listener,
+      oldElm: Element = oldVnode.elm as Element,
+      on = vnode && (vnode.data as VNodeData).on,
+      elm: Element = (vnode && vnode.elm) as Element,
+      name: string;
+
+  // 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 as any).listener = (oldVnode as any).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);
+        }
+      }
+    }
+  }
+}
+
+export const eventListenersModule = {
+  create: updateEventListeners,
+  update: updateEventListeners,
+  destroy: updateEventListeners
+} as Module;
+export default eventListenersModule;

web/static/libs/snabbdom/src/modules/hero.ts

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+import {VNode, VNodeData} from '../vnode';
+import {Module} from './module';
+
+export type Hero = { id: string }
+
+var raf = (typeof window !== 'undefined' && window.requestAnimationFrame) || setTimeout;
+var nextFrame = function(fn: any) { raf(function() { raf(fn); }); };
+
+function setNextFrame(obj: any, prop: string, val: any): void {
+  nextFrame(function() { obj[prop] = val; });
+}
+
+function getTextNodeRect(textNode: Text): ClientRect | undefined {
+  var rect: ClientRect | undefined;
+  if (document.createRange) {
+    var range = document.createRange();
+    range.selectNodeContents(textNode);
+    if (range.getBoundingClientRect) {
+        rect = range.getBoundingClientRect();
+    }
+  }
+  return rect;
+}
+
+function calcTransformOrigin(isTextNode: boolean,
+                             textRect: ClientRect | undefined,
+                             boundingRect: ClientRect): string {
+  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: ClientRect | undefined,
+                   newTextRect: ClientRect | undefined): number {
+  if (oldTextRect && newTextRect) {
+    return ((oldTextRect.left + oldTextRect.width/2) - (newTextRect.left + newTextRect.width/2));
+  }
+  return 0;
+}
+function getTextDy(oldTextRect: ClientRect | undefined,
+                   newTextRect: ClientRect | undefined): number {
+  if (oldTextRect && newTextRect) {
+    return ((oldTextRect.top + oldTextRect.height/2) - (newTextRect.top + newTextRect.height/2));
+  }
+  return 0;
+}
+
+function isTextElement(elm: Element | Text): elm is Text {
+  return elm.childNodes.length === 1 && elm.childNodes[0].nodeType === 3;
+}
+
+var removed: any, created: any;
+
+function pre() {
+  removed = {};
+  created = [];
+}
+
+function create(oldVnode: VNode, vnode: VNode): void {
+  var hero = (vnode.data as VNodeData).hero;
+  if (hero && hero.id) {
+    created.push(hero.id);
+    created.push(vnode);
+  }
+}
+
+function destroy(vnode: VNode): void {
+  var hero = (vnode.data as VNodeData).hero;
+  if (hero && hero.id) {
+    var elm = vnode.elm;
+    (vnode as any).isTextNode = isTextElement(elm as Element | Text); //is this a text node?
+    (vnode as any).boundingRect = (elm as Element).getBoundingClientRect(); //save the bounding rectangle to a new property on the vnode
+    (vnode as any).textRect = (vnode as any).isTextNode ? getTextNodeRect((elm as Element).childNodes[0] as Text) : null; //save bounding rect of inner text node
+    var computedStyle = window.getComputedStyle(elm as Element, void 0); //get current styles (includes inherited properties)
+    (vnode as any).savedStyle = JSON.parse(JSON.stringify(computedStyle)); //save a copy of computed style values
+    removed[hero.id] = vnode;
+  }
+}
+
+function post() {
+  var i: number, id: any, newElm: Element, oldVnode: VNode, oldElm: Element,
+      hRatio: number, wRatio: number,
+      oldRect: ClientRect, newRect: ClientRect, dx: number, dy: number,
+      origTransform: string | null, origTransition: string | null,
+      newStyle: CSSStyleDeclaration, oldStyle: CSSStyleDeclaration,
+      newComputedStyle: CSSStyleDeclaration, isTextNode: boolean,
+      newTextRect: ClientRect | undefined, oldTextRect: ClientRect | undefined;
+  for (i = 0; i < created.length; i += 2) {
+    id = created[i];
+    newElm = created[i+1].elm;
+    oldVnode = removed[id];
+    if (oldVnode) {
+      isTextNode = (oldVnode as any).isTextNode && isTextElement(newElm); //Are old & new both text?
+      newStyle = (newElm as HTMLElement).style;
+      newComputedStyle = window.getComputedStyle(newElm, void 0); //get full computed style for new element
+      oldElm = oldVnode.elm as Element;
+      oldStyle = (oldElm as HTMLElement).style;
+      //Overall element bounding boxes
+      newRect = newElm.getBoundingClientRect();
+      oldRect = (oldVnode as any).boundingRect; //previously saved bounding rect
+      //Text node bounding boxes & distances
+      if (isTextNode) {
+        newTextRect = getTextNodeRect(newElm.childNodes[0] as Text);
+        oldTextRect = (oldVnode as any).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 as any).savedStyle) { //re-apply saved inherited properties
+        if (parseInt(key) != key as any as number) {
+          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 as any)[key] = (oldVnode as any).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: TransitionEvent) {
+        if (ev.propertyName === 'transform')
+          document.body.removeChild(ev.target as Node);
+      });
+    }
+  }
+  removed = created = undefined;
+}
+
+export const heroModule = {pre, create, destroy, post} as Module;
+export default heroModule;

web/static/libs/snabbdom/src/modules/module.ts

@@ -0,0 +1,10 @@
+import {PreHook, CreateHook, UpdateHook, DestroyHook, RemoveHook, PostHook} from '../hooks';
+
+export interface Module {
+  pre: PreHook;
+  create: CreateHook;
+  update: UpdateHook;
+  destroy: DestroyHook;
+  remove: RemoveHook;
+  post: PostHook;
+}

web/static/libs/snabbdom/src/modules/props.ts

@@ -0,0 +1,31 @@
+import {VNode, VNodeData} from '../vnode';
+import {Module} from './module';
+
+export type Props = Record<string, any>;
+
+function updateProps(oldVnode: VNode, vnode: VNode): void {
+  var key: string, cur: any, old: any, elm = vnode.elm,
+      oldProps = (oldVnode.data as VNodeData).props,
+      props = (vnode.data as VNodeData).props;
+
+  if (!oldProps && !props) return;
+  if (oldProps === props) return;
+  oldProps = oldProps || {};
+  props = props || {};
+
+  for (key in oldProps) {
+    if (!props[key]) {
+      delete (elm as any)[key];
+    }
+  }
+  for (key in props) {
+    cur = props[key];
+    old = oldProps[key];
+    if (old !== cur && (key !== 'value' || (elm as any)[key] !== cur)) {
+      (elm as any)[key] = cur;
+    }
+  }
+}
+
+export const propsModule = {create: updateProps, update: updateProps} as Module;
+export default propsModule;

web/static/libs/snabbdom/src/modules/style.ts

@@ -0,0 +1,103 @@
+import {VNode, VNodeData} from '../vnode';
+import {Module} from './module';
+
+export type VNodeStyle = Record<string, string> & {
+  delayed?: Record<string, string>
+  remove?: Record<string, string>
+}
+
+// Bindig `requestAnimationFrame` like this fixes a bug in IE/Edge. See #360 and #409.
+var raf = (typeof window !== 'undefined' && (window.requestAnimationFrame).bind(window)) || setTimeout;
+var nextFrame = function(fn: any) { raf(function() { raf(fn); }); };
+var reflowForced = false;
+
+function setNextFrame(obj: any, prop: string, val: any): void {
+  nextFrame(function() { obj[prop] = val; });
+}
+
+function updateStyle(oldVnode: VNode, vnode: VNode): void {
+  var cur: any, name: string, elm = vnode.elm,
+      oldStyle = (oldVnode.data as VNodeData).style,
+      style = (vnode.data as VNodeData).style;
+
+  if (!oldStyle && !style) return;
+  if (oldStyle === style) return;
+  oldStyle = oldStyle || {} as VNodeStyle;
+  style = style || {} as VNodeStyle;
+  var oldHasDel = 'delayed' in oldStyle;
+
+  for (name in oldStyle) {
+    if (!style[name]) {
+      if (name[0] === '-' && name[1] === '-') {
+        (elm as any).style.removeProperty(name);
+      } else {
+        (elm as any).style[name] = '';
+      }
+    }
+  }
+  for (name in style) {
+    cur = style[name];
+    if (name === 'delayed' && style.delayed) {
+      for (let name2 in style.delayed) {
+        cur = style.delayed[name2];
+        if (!oldHasDel || cur !== (oldStyle.delayed as any)[name2]) {
+          setNextFrame((elm as any).style, name2, cur);
+        }
+      }
+    } else if (name !== 'remove' && cur !== oldStyle[name]) {
+      if (name[0] === '-' && name[1] === '-') {
+        (elm as any).style.setProperty(name, cur);
+      } else {
+        (elm as any).style[name] = cur;
+      }
+    }
+  }
+}
+
+function applyDestroyStyle(vnode: VNode): void {
+  var style: any, name: string, elm = vnode.elm, s = (vnode.data as VNodeData).style;
+  if (!s || !(style = s.destroy)) return;
+  for (name in style) {
+    (elm as any).style[name] = style[name];
+  }
+}
+
+function applyRemoveStyle(vnode: VNode, rm: () => void): void {
+  var s = (vnode.data as VNodeData).style;
+  if (!s || !s.remove) {
+    rm();
+    return;
+  }
+  if(!reflowForced) {
+    getComputedStyle(document.body).transform;
+    reflowForced = true;
+  }
+  var name: string, elm = vnode.elm, i = 0, compStyle: CSSStyleDeclaration,
+      style = s.remove, amount = 0, applied: Array<string> = [];
+  for (name in style) {
+    applied.push(name);
+    (elm as any).style[name] = style[name];
+  }
+  compStyle = getComputedStyle(elm as Element);
+  var props = (compStyle as any)['transition-property'].split(', ');
+  for (; i < props.length; ++i) {
+    if(applied.indexOf(props[i]) !== -1) amount++;
+  }
+  (elm as Element).addEventListener('transitionend', function (ev: TransitionEvent) {
+    if (ev.target === elm) --amount;
+    if (amount === 0) rm();
+  });
+}
+
+function forceReflow() {
+  reflowForced = false;
+}
+
+export const styleModule = {
+  pre: forceReflow,
+  create: updateStyle,
+  update: updateStyle,
+  destroy: applyDestroyStyle,
+  remove: applyRemoveStyle
+} as Module;
+export default styleModule;

web/static/libs/snabbdom/src/snabbdom.bundle.ts

@@ -0,0 +1,16 @@
+import {init} from './snabbdom';
+import {attributesModule} from './modules/attributes'; // for setting attributes on DOM elements
+import {classModule} from './modules/class'; // makes it easy to toggle classes
+import {propsModule} from './modules/props'; // for setting properties on DOM elements
+import {styleModule} from './modules/style'; // handles styling on elements with support for animations
+import {eventListenersModule} from './modules/eventlisteners'; // attaches event listeners
+import {h} from './h'; // helper function for creating vnodes
+var patch = init([ // Init patch function with choosen modules
+  attributesModule,
+  classModule,
+  propsModule,
+  styleModule,
+  eventListenersModule
+]) as (oldVNode: any, vnode: any) => any;
+export const snabbdomBundle = { patch, h: h as any };
+export default snabbdomBundle;

web/static/libs/snabbdom/src/snabbdom.ts

@@ -0,0 +1,318 @@
+/* global module, document, Node */
+import {Module} from './modules/module';
+import {Hooks} from './hooks';
+import vnode, {VNode, VNodeData, Key} from './vnode';
+import * as is from './is';
+import htmlDomApi, {DOMAPI} from './htmldomapi';
+
+function isUndef(s: any): boolean { return s === undefined; }
+function isDef(s: any): boolean { return s !== undefined; }
+
+type VNodeQueue = Array<VNode>;
+
+const emptyNode = vnode('', {}, [], undefined, undefined);
+
+function sameVnode(vnode1: VNode, vnode2: VNode): boolean {
+  return vnode1.key === vnode2.key && vnode1.sel === vnode2.sel;
+}
+
+function isVnode(vnode: any): vnode is VNode {
+  return vnode.sel !== undefined;
+}
+
+type KeyToIndexMap = {[key: string]: number};
+
+type ArraysOf<T> = {
+  [K in keyof T]: (T[K])[];
+}
+
+type ModuleHooks = ArraysOf<Module>;
+
+function createKeyToOldIdx(children: Array<VNode>, beginIdx: number, endIdx: number): KeyToIndexMap {
+  let i: number, map: KeyToIndexMap = {}, key: Key | undefined, ch;
+  for (i = beginIdx; i <= endIdx; ++i) {
+    ch = children[i];
+    if (ch != null) {
+      key = ch.key;
+      if (key !== undefined) map[key] = i;
+    }
+  }
+  return map;
+}
+
+const hooks: (keyof Module)[] = ['create', 'update', 'remove', 'destroy', 'pre', 'post'];
+
+export {h} from './h';
+export {thunk} from './thunk';
+
+export function init(modules: Array<Partial<Module>>, domApi?: DOMAPI) {
+  let i: number, j: number, cbs = ({} as ModuleHooks);
+
+  const api: DOMAPI = domApi !== undefined ? domApi : htmlDomApi;
+
+  for (i = 0; i < hooks.length; ++i) {
+    cbs[hooks[i]] = [];
+    for (j = 0; j < modules.length; ++j) {
+      const hook = modules[j][hooks[i]];
+      if (hook !== undefined) {
+        (cbs[hooks[i]] as Array<any>).push(hook);
+      }
+    }
+  }
+
+  function emptyNodeAt(elm: Element) {
+    const id = elm.id ? '#' + elm.id : '';
+    const c = elm.className ? '.' + elm.className.split(' ').join('.') : '';
+    return vnode(api.tagName(elm).toLowerCase() + id + c, {}, [], undefined, elm);
+  }
+
+  function createRmCb(childElm: Node, listeners: number) {
+    return function rmCb() {
+      if (--listeners === 0) {
+        const parent = api.parentNode(childElm);
+        api.removeChild(parent, childElm);
+      }
+    };
+  }
+
+  function createElm(vnode: VNode, insertedVnodeQueue: VNodeQueue): Node {
+    let i: any, data = vnode.data;
+    if (data !== undefined) {
+      if (isDef(i = data.hook) && isDef(i = i.init)) {
+        i(vnode);
+        data = vnode.data;
+      }
+    }
+    let children = vnode.children, sel = vnode.sel;
+    if (sel === '!') {
+      if (isUndef(vnode.text)) {
+        vnode.text = '';
+      }
+      vnode.elm = api.createComment(vnode.text as string);
+    } else if (sel !== undefined) {
+      // Parse selector
+      const hashIdx = sel.indexOf('#');
+      const dotIdx = sel.indexOf('.', hashIdx);
+      const hash = hashIdx > 0 ? hashIdx : sel.length;
+      const dot = dotIdx > 0 ? dotIdx : sel.length;
+      const tag = hashIdx !== -1 || dotIdx !== -1 ? sel.slice(0, Math.min(hash, dot)) : sel;
+      const elm = vnode.elm = isDef(data) && isDef(i = (data as VNodeData).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 (is.array(children)) {
+        for (i = 0; i < children.length; ++i) {
+          const ch = children[i];
+          if (ch != null) {
+            api.appendChild(elm, createElm(ch as VNode, insertedVnodeQueue));
+          }
+        }
+      } else if (is.primitive(vnode.text)) {
+        api.appendChild(elm, api.createTextNode(vnode.text));
+      }
+      i = (vnode.data as VNodeData).hook; // Reuse variable
+      if (isDef(i)) {
+        if (i.create) i.create(emptyNode, vnode);
+        if (i.insert) insertedVnodeQueue.push(vnode);
+      }
+    } else {
+      vnode.elm = api.createTextNode(vnode.text as string);
+    }
+    return vnode.elm;
+  }
+
+  function addVnodes(parentElm: Node,
+                     before: Node | null,
+                     vnodes: Array<VNode>,
+                     startIdx: number,
+                     endIdx: number,
+                     insertedVnodeQueue: VNodeQueue) {
+    for (; startIdx <= endIdx; ++startIdx) {
+      const ch = vnodes[startIdx];
+      if (ch != null) {
+        api.insertBefore(parentElm, createElm(ch, insertedVnodeQueue), before);
+      }
+    }
+  }
+
+  function invokeDestroyHook(vnode: VNode) {
+    let i: any, j: number, data = vnode.data;
+    if (data !== undefined) {
+      if (isDef(i = data.hook) && isDef(i = i.destroy)) i(vnode);
+      for (i = 0; i < cbs.destroy.length; ++i) cbs.destroy[i](vnode);
+      if (vnode.children !== undefined) {
+        for (j = 0; j < vnode.children.length; ++j) {
+          i = vnode.children[j];
+          if (i != null && typeof i !== "string") {
+            invokeDestroyHook(i);
+          }
+        }
+      }
+    }
+  }
+
+  function removeVnodes(parentElm: Node,
+                        vnodes: Array<VNode>,
+                        startIdx: number,
+                        endIdx: number): void {
+    for (; startIdx <= endIdx; ++startIdx) {
+      let i: any, listeners: number, rm: () => void, ch = vnodes[startIdx];
+      if (ch != null) {
+        if (isDef(ch.sel)) {
+          invokeDestroyHook(ch);
+          listeners = cbs.remove.length + 1;
+          rm = createRmCb(ch.elm as Node, listeners);
+          for (i = 0; i < cbs.remove.length; ++i) cbs.remove[i](ch, rm);
+          if (isDef(i = ch.data) && isDef(i = i.hook) && isDef(i = i.remove)) {
+            i(ch, rm);
+          } else {
+            rm();
+          }
+        } else { // Text node
+          api.removeChild(parentElm, ch.elm as Node);
+        }
+      }
+    }
+  }
+
+  function updateChildren(parentElm: Node,
+                          oldCh: Array<VNode>,
+                          newCh: Array<VNode>,
+                          insertedVnodeQueue: VNodeQueue) {
+    let oldStartIdx = 0, newStartIdx = 0;
+    let oldEndIdx = oldCh.length - 1;
+    let oldStartVnode = oldCh[0];
+    let oldEndVnode = oldCh[oldEndIdx];
+    let newEndIdx = newCh.length - 1;
+    let newStartVnode = newCh[0];
+    let newEndVnode = newCh[newEndIdx];
+    let oldKeyToIdx: any;
+    let idxInOld: number;
+    let elmToMove: VNode;
+    let before: any;
+
+    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 as Node, api.nextSibling(oldEndVnode.elm as Node));
+        oldStartVnode = oldCh[++oldStartIdx];
+        newEndVnode = newCh[--newEndIdx];
+      } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
+        patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
+        api.insertBefore(parentElm, oldEndVnode.elm as Node, oldStartVnode.elm as Node);
+        oldEndVnode = oldCh[--oldEndIdx];
+        newStartVnode = newCh[++newStartIdx];
+      } else {
+        if (oldKeyToIdx === undefined) {
+          oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx);
+        }
+        idxInOld = oldKeyToIdx[newStartVnode.key as string];
+        if (isUndef(idxInOld)) { // New element
+          api.insertBefore(parentElm, createElm(newStartVnode, insertedVnodeQueue), oldStartVnode.elm as Node);
+          newStartVnode = newCh[++newStartIdx];
+        } else {
+          elmToMove = oldCh[idxInOld];
+          if (elmToMove.sel !== newStartVnode.sel) {
+            api.insertBefore(parentElm, createElm(newStartVnode, insertedVnodeQueue), oldStartVnode.elm as Node);
+          } else {
+            patchVnode(elmToMove, newStartVnode, insertedVnodeQueue);
+            oldCh[idxInOld] = undefined as any;
+            api.insertBefore(parentElm, (elmToMove.elm as Node), oldStartVnode.elm as Node);
+          }
+          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, vnode: VNode, insertedVnodeQueue: VNodeQueue) {
+    let i: any, hook: any;
+    if (isDef(i = vnode.data) && isDef(hook = i.hook) && isDef(i = hook.prepatch)) {
+      i(oldVnode, vnode);
+    }
+    const elm = vnode.elm = (oldVnode.elm as Node);
+    let oldCh = oldVnode.children;
+    let ch = vnode.children;
+    if (oldVnode === vnode) return;
+    if (vnode.data !== undefined) {
+      for (i = 0; i < cbs.update.length; ++i) cbs.update[i](oldVnode, vnode);
+      i = vnode.data.hook;
+      if (isDef(i) && isDef(i = i.update)) i(oldVnode, vnode);
+    }
+    if (isUndef(vnode.text)) {
+      if (isDef(oldCh) && isDef(ch)) {
+        if (oldCh !== ch) updateChildren(elm, oldCh as Array<VNode>, ch as Array<VNode>, insertedVnodeQueue);
+      } else if (isDef(ch)) {
+        if (isDef(oldVnode.text)) api.setTextContent(elm, '');
+        addVnodes(elm, null, ch as Array<VNode>, 0, (ch as Array<VNode>).length - 1, insertedVnodeQueue);
+      } else if (isDef(oldCh)) {
+        removeVnodes(elm, oldCh as Array<VNode>, 0, (oldCh as Array<VNode>).length - 1);
+      } else if (isDef(oldVnode.text)) {
+        api.setTextContent(elm, '');
+      }
+    } else if (oldVnode.text !== vnode.text) {
+      if (isDef(oldCh)) {
+        removeVnodes(elm, oldCh as Array<VNode>, 0, (oldCh as Array<VNode>).length - 1);
+      }
+      api.setTextContent(elm, vnode.text as string);
+    }
+    if (isDef(hook) && isDef(i = hook.postpatch)) {
+      i(oldVnode, vnode);
+    }
+  }
+
+  return function patch(oldVnode: VNode | Element, vnode: VNode): VNode {
+    let i: number, elm: Node, parent: Node;
+    const insertedVnodeQueue: VNodeQueue = [];
+    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 as Node;
+      parent = api.parentNode(elm);
+
+      createElm(vnode, insertedVnodeQueue);
+
+      if (parent !== null) {
+        api.insertBefore(parent, vnode.elm as Node, api.nextSibling(elm));
+        removeVnodes(parent, [oldVnode], 0, 0);
+      }
+    }
+
+    for (i = 0; i < insertedVnodeQueue.length; ++i) {
+      (((insertedVnodeQueue[i].data as VNodeData).hook as Hooks).insert as any)(insertedVnodeQueue[i]);
+    }
+    for (i = 0; i < cbs.post.length; ++i) cbs.post[i]();
+    return vnode;
+  };
+}

web/static/libs/snabbdom/src/thunk.ts

@@ -0,0 +1,64 @@
+import {VNode, VNodeData} from './vnode';
+import {h} from './h';
+
+export interface ThunkData extends VNodeData {
+  fn: () => VNode;
+  args: Array<any>;
+}
+
+export interface Thunk extends VNode {
+  data: ThunkData;
+}
+
+export interface ThunkFn {
+  (sel: string, fn: Function, args: Array<any>): Thunk;
+  (sel: string, key: any, fn: Function, args: Array<any>): Thunk;
+}
+
+function copyToThunk(vnode: VNode, thunk: VNode): void {
+  thunk.elm = vnode.elm;
+  (vnode.data as VNodeData).fn = (thunk.data as VNodeData).fn;
+  (vnode.data as VNodeData).args = (thunk.data as VNodeData).args;
+  thunk.data = vnode.data;
+  thunk.children = vnode.children;
+  thunk.text = vnode.text;
+  thunk.elm = vnode.elm;
+}
+
+function init(thunk: VNode): void {
+  const cur = thunk.data as VNodeData;
+  const vnode = (cur.fn as any).apply(undefined, cur.args);
+  copyToThunk(vnode, thunk);
+}
+
+function prepatch(oldVnode: VNode, thunk: VNode): void {
+  let i: number, old = oldVnode.data as VNodeData, cur = thunk.data as VNodeData;
+  const oldArgs = old.args, args = cur.args;
+  if (old.fn !== cur.fn || (oldArgs as any).length !== (args as any).length) {
+    copyToThunk((cur.fn as any).apply(undefined, args), thunk);
+    return;
+  }
+  for (i = 0; i < (args as any).length; ++i) {
+    if ((oldArgs as any)[i] !== (args as any)[i]) {
+      copyToThunk((cur.fn as any).apply(undefined, args), thunk);
+      return;
+    }
+  }
+  copyToThunk(oldVnode, thunk);
+}
+
+export const thunk = function thunk(sel: string, key?: any, fn?: any, args?: any): VNode {
+  if (args === undefined) {
+    args = fn;
+    fn = key;
+    key = undefined;
+  }
+  return h(sel, {
+    key: key,
+    hook: {init: init, prepatch: prepatch},
+    fn: fn,
+    args: args
+  });
+} as ThunkFn;
+
+export default thunk;

web/static/libs/snabbdom/src/tovnode.ts

@@ -0,0 +1,39 @@
+import vnode, {VNode} from './vnode';
+import htmlDomApi, {DOMAPI} from './htmldomapi';
+
+export function toVNode(node: Node, domApi?: DOMAPI): VNode {
+  const api: DOMAPI = domApi !== undefined ? domApi : htmlDomApi;
+  let text: string;
+  if (api.isElement(node)) {
+    const id = node.id ? '#' + node.id : '';
+    const cn = node.getAttribute('class');
+    const c = cn ? '.' + cn.split(' ').join('.') : '';
+    const sel = api.tagName(node).toLowerCase() + id + c;
+    const attrs: any = {};
+    const children: Array<VNode> = [];
+    let name: string;
+    let i: number, n: number;
+    const elmAttrs = node.attributes;
+    const 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}, children, undefined, node);
+  } else if (api.isText(node)) {
+    text = api.getTextContent(node) as string;
+    return vnode(undefined, undefined, undefined, text, node);
+  } else if (api.isComment(node)) {
+    text = api.getTextContent(node) as string;
+    return vnode('!', {}, [], text, node as any);
+  } else {
+    return vnode('', {}, [], undefined, node as any);
+  }
+}
+
+export default toVNode;

web/static/libs/snabbdom/src/vnode.ts

@@ -0,0 +1,49 @@
+import {Hooks} from './hooks';
+import {AttachData} from './helpers/attachto'
+import {VNodeStyle} from './modules/style'
+import {On} from './modules/eventlisteners'
+import {Attrs} from './modules/attributes'
+import {Classes} from './modules/class'
+import {Props} from './modules/props'
+import {Dataset} from './modules/dataset'
+import {Hero} from './modules/hero'
+
+export type Key = string | number;
+
+export interface VNode {
+  sel: string | undefined;
+  data: VNodeData | undefined;
+  children: Array<VNode | string> | undefined;
+  elm: Node | undefined;
+  text: string | undefined;
+  key: Key | undefined;
+}
+
+export interface VNodeData {
+  props?: Props;
+  attrs?: Attrs;
+  class?: Classes;
+  style?: VNodeStyle;
+  dataset?: Dataset;
+  on?: On;
+  hero?: Hero;
+  attachData?: AttachData;
+  hook?: Hooks;
+  key?: Key;
+  ns?: string; // for SVGs
+  fn?: () => VNode; // for thunks
+  args?: Array<any>; // for thunks
+  [key: string]: any; // for any other 3rd party module
+}
+
+export function vnode(sel: string | undefined,
+                      data: any | undefined,
+                      children: Array<VNode | string> | undefined,
+                      text: string | undefined,
+                      elm: Element | Text | undefined): VNode {
+  let key = data === undefined ? undefined : data.key;
+  return {sel: sel, data: data, children: children,
+          text: text, elm: elm, key: key};
+}
+
+export default vnode;