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child;\n  for (let i = 0; i < dom.length; i++) {\n    const node = dom[i];\n    const cell = node.cell;\n    // the cell change, the content must be updated\n    if (node.change === NODE_CHANGE_CELL) {\n      if (i < childrenNu) {\n        child = children[i];\n        nodeRender(child, cell, i);\n      }\n      else {\n        const newChild = createNode(el, cell.type);\n        child = (_a = nodeRender(newChild, cell, i)) !== null && _a !== void 0 ? _a : newChild;\n        child.classList.add('virtual-item');\n        el.appendChild(child);\n      }\n      child['$ionCell'] = cell;\n    }\n    else {\n      child = children[i];\n    }\n    // only update position when it changes\n    if (node.change !== NODE_CHANGE_NONE) {\n      child.style.transform = `translate3d(0,${node.top}px,0)`;\n    }\n    // update visibility\n    const visible = cell.visible;\n    if (node.visible !== visible) {\n      if (visible) {\n        child.classList.remove('virtual-loading');\n      }\n      else {\n        child.classList.add('virtual-loading');\n      }\n      node.visible = visible;\n    }\n    // dynamic height\n    if (cell.reads > 0) {\n      updateCellHeight(cell, child);\n      cell.reads--;\n    }\n  }\n};\nconst createNode = (el, type) => {\n  const template = getTemplate(el, type);\n  if (template && el.ownerDocument !== null) {\n    return el.ownerDocument.importNode(template.content, true).children[0];\n  }\n  return null;\n};\nconst getTemplate = (el, type) => {\n  switch (type) {\n    case CELL_TYPE_ITEM:\n      return el.querySelector('template:not([name])');\n    case CELL_TYPE_HEADER:\n      return el.querySelector('template[name=header]');\n    case CELL_TYPE_FOOTER:\n      return el.querySelector('template[name=footer]');\n  }\n};\nconst getViewport = (scrollTop, vierportHeight, margin) => {\n  return {\n    top: Math.max(scrollTop - margin, 0),\n    bottom: scrollTop + vierportHeight + margin,\n  };\n};\nconst getRange = (heightIndex, viewport, buffer) => 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c.index === index);\n  }\n};\nconst inplaceUpdate = (dst, src, offset) => {\n  if (offset === 0 && src.length >= dst.length) {\n    return src;\n  }\n  for (let i = 0; i < src.length; i++) {\n    dst[i + offset] = src[i];\n  }\n  return dst;\n};\nconst calcCells = (items, itemHeight, headerHeight, footerHeight, headerFn, footerFn, approxHeaderHeight, approxFooterHeight, approxItemHeight, j, offset, len) => {\n  const cells = [];\n  const end = len + offset;\n  for (let i = offset; i < end; i++) {\n    const item = items[i];\n    if (headerFn) {\n      const value = headerFn(item, i, items);\n      if (value != null) {\n        cells.push({\n          i: j++,\n          type: CELL_TYPE_HEADER,\n          value,\n          index: i,\n          height: headerHeight ? headerHeight(value, i) : approxHeaderHeight,\n          reads: headerHeight ? 0 : MIN_READS,\n          visible: !!headerHeight,\n        });\n      }\n    }\n    cells.push({\n      i: j++,\n      type: CELL_TYPE_ITEM,\n      value: item,\n      index: i,\n      height: itemHeight ? itemHeight(item, i) : approxItemHeight,\n      reads: itemHeight ? 0 : MIN_READS,\n      visible: !!itemHeight,\n    });\n    if (footerFn) {\n      const value = footerFn(item, i, items);\n      if (value != null) {\n        cells.push({\n          i: j++,\n          type: CELL_TYPE_FOOTER,\n          value,\n          index: i,\n          height: footerHeight ? footerHeight(value, i) : approxFooterHeight,\n          reads: footerHeight ? 0 : MIN_READS,\n          visible: !!footerHeight,\n        });\n      }\n    }\n  }\n  return cells;\n};\nconst calcHeightIndex = (buf, cells, index) => {\n  let acum = buf[index];\n  for (let i = index; i < buf.length; i++) {\n    buf[i] = acum;\n    acum += cells[i].height;\n  }\n  return acum;\n};\nconst resizeBuffer = (buf, len) => {\n  if (!buf) {\n    return new Uint32Array(len);\n  }\n  if (buf.length === len) {\n    return buf;\n  }\n  else if (len > buf.length) {\n    const newBuf = new Uint32Array(len);\n    newBuf.set(buf);\n    return newBuf;\n  }\n  else {\n    return buf.subarray(0, len);\n  }\n};\nconst positionForIndex = (index, cells, heightIndex) => {\n  const cell = cells.find((c) => c.type === CELL_TYPE_ITEM && c.index === index);\n  if (cell) {\n    return heightIndex[cell.i];\n  }\n  return -1;\n};\n\nconst virtualScrollCss = \"ion-virtual-scroll{display:block;position:relative;width:100%;contain:strict;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}ion-virtual-scroll>.virtual-loading{opacity:0}ion-virtual-scroll>.virtual-item{position:absolute !important;top:0 !important;right:0 !important;left:0 !important;-webkit-transition-duration:0ms;transition-duration:0ms;will-change:transform}\";\n\nconst VirtualScroll = class {\n  constructor(hostRef) {\n    registerInstance(this, hostRef);\n    this.range = { offset: 0, length: 0 };\n    this.viewportHeight = 0;\n    this.cells = [];\n    this.virtualDom = [];\n    this.isEnabled = false;\n    this.viewportOffset = 0;\n    this.currentScrollTop = 0;\n    this.indexDirty = 0;\n    this.lastItemLen = 0;\n    this.totalHeight = 0;\n    /**\n     * It is important to provide this\n     * if virtual item height will be significantly larger than the default\n     * The approximate height of each virtual item template's cell.\n     * This dimension is used to help determine how many cells should\n     * be created when initialized, and to help calculate the height of\n     * the scrollable area. This height value can only use `px` units.\n     * Note that the actual rendered size of each cell comes from the\n     * app's CSS, whereas this approximation is used to help calculate\n     * initial dimensions before the item has been rendered.\n     */\n    this.approxItemHeight = 45;\n    /**\n     * The approximate height of each header template's cell.\n     * This dimension is used to help determine how many cells should\n     * be created when initialized, and to help calculate the height of\n     * the scrollable area. This height value can only use `px` units.\n     * Note that the actual rendered size of each cell comes from the\n     * app's CSS, whereas this approximation is used to help calculate\n     * initial dimensions before the item has been rendered.\n     */\n    this.approxHeaderHeight = 30;\n    /**\n     * The approximate width of each footer template's cell.\n     * This dimension is used to help determine how many cells should\n     * be created when initialized, and to help calculate the height of\n     * the scrollable area. This height value can only use `px` units.\n     * Note that the actual rendered size of each cell comes from the\n     * app's CSS, whereas this approximation is used to help calculate\n     * initial dimensions before the item has been rendered.\n     */\n    this.approxFooterHeight = 30;\n    this.onScroll = () => {\n      this.updateVirtualScroll();\n    };\n  }\n  itemsChanged() {\n    this.calcCells();\n    this.updateVirtualScroll();\n  }\n  componentWillLoad() {\n    console.warn(`[Deprecation Warning]: ion-virtual-scroll has been deprecated and will be removed in Ionic Framework v7.0. See https://ionicframework.com/docs/angular/virtual-scroll for migration steps.`);\n  }\n  async connectedCallback() {\n    const contentEl = this.el.closest('ion-content');\n    if (!contentEl) {\n      console.error('<ion-virtual-scroll> must be used inside an <ion-content>');\n      return;\n    }\n    this.scrollEl = await contentEl.getScrollElement();\n    this.contentEl = contentEl;\n    this.calcCells();\n    this.updateState();\n  }\n  componentDidUpdate() {\n    this.updateState();\n  }\n  disconnectedCallback() {\n    this.scrollEl = undefined;\n  }\n  onResize() {\n    this.calcCells();\n    this.updateVirtualScroll();\n  }\n  /**\n   * Returns the position of the virtual item at the given index.\n   */\n  positionForItem(index) {\n    return Promise.resolve(positionForIndex(index, this.cells, this.getHeightIndex()));\n  }\n  /**\n   * This method marks a subset of items as dirty, so they can be re-rendered. Items should be marked as\n   * dirty any time the content or their style changes.\n   *\n   * The subset of items to be updated can are specifying by an offset and a length.\n   */\n  async checkRange(offset, len = -1) {\n    // TODO: kind of hacky how we do in-place updated of the cells\n    // array. this part needs a complete refactor\n    if (!this.items) {\n      return;\n    }\n    const length = len === -1 ? this.items.length - offset : len;\n    const cellIndex = findCellIndex(this.cells, offset);\n    const cells = calcCells(this.items, this.itemHeight, this.headerHeight, this.footerHeight, this.headerFn, this.footerFn, this.approxHeaderHeight, this.approxFooterHeight, this.approxItemHeight, cellIndex, offset, length);\n    this.cells = inplaceUpdate(this.cells, cells, cellIndex);\n    this.lastItemLen = this.items.length;\n    this.indexDirty = Math.max(offset - 1, 0);\n    this.scheduleUpdate();\n  }\n  /**\n   * This method marks the tail the items array as dirty, so they can be re-rendered.\n   *\n   * It's equivalent to calling:\n   *\n   * ```js\n   * virtualScroll.checkRange(lastItemLen);\n   * ```\n   */\n  async checkEnd() {\n    if (this.items) {\n      this.checkRange(this.lastItemLen);\n    }\n  }\n  updateVirtualScroll() {\n    // do nothing if virtual-scroll is disabled\n    if (!this.isEnabled || !this.scrollEl) {\n      return;\n    }\n    // unschedule future updates\n    if (this.timerUpdate) {\n      clearTimeout(this.timerUpdate);\n      this.timerUpdate = undefined;\n    }\n    // schedule DOM operations into the stencil queue\n    readTask(this.readVS.bind(this));\n    writeTask(this.writeVS.bind(this));\n  }\n  readVS() {\n    const { contentEl, scrollEl, el } = this;\n    let topOffset = 0;\n    let node = el;\n    while (node !== null && node !== contentEl) {\n      topOffset += node.offsetTop;\n      node = node.offsetParent;\n    }\n    this.viewportOffset = topOffset;\n    if (scrollEl) {\n      this.viewportHeight = scrollEl.offsetHeight;\n      this.currentScrollTop = scrollEl.scrollTop;\n    }\n  }\n  writeVS() {\n    const dirtyIndex = this.indexDirty;\n    // get visible viewport\n    const scrollTop = this.currentScrollTop - this.viewportOffset;\n    const viewport = getViewport(scrollTop, this.viewportHeight, 100);\n    // compute lazily the height index\n    const heightIndex = this.getHeightIndex();\n    // get array bounds of visible cells base in the viewport\n    const range = getRange(heightIndex, viewport, 2);\n    // fast path, do nothing\n    const shouldUpdate = getShouldUpdate(dirtyIndex, this.range, range);\n    if (!shouldUpdate) {\n      return;\n    }\n    this.range = range;\n    // in place mutation of the virtual DOM\n    updateVDom(this.virtualDom, heightIndex, this.cells, range);\n    // Write DOM\n    // Different code paths taken depending of the render API used\n    if (this.nodeRender) {\n      doRender(this.el, this.nodeRender, this.virtualDom, this.updateCellHeight.bind(this));\n    }\n    else if (this.domRender) {\n      this.domRender(this.virtualDom);\n    }\n    else if (this.renderItem) {\n      forceUpdate(this);\n    }\n  }\n  updateCellHeight(cell, node) {\n    const update = () => {\n      if (node['$ionCell'] === cell) {\n        const style = window.getComputedStyle(node);\n        const height = node.offsetHeight + parseFloat(style.getPropertyValue('margin-bottom'));\n        this.setCellHeight(cell, height);\n      }\n    };\n    if (node) {\n      componentOnReady(node, update);\n    }\n    else {\n      update();\n    }\n  }\n  setCellHeight(cell, height) {\n    const index = cell.i;\n    // the cell might changed since the height update was scheduled\n    if (cell !== this.cells[index]) {\n      return;\n    }\n    if (cell.height !== height || cell.visible !== true) {\n      cell.visible = true;\n      cell.height = height;\n      this.indexDirty = Math.min(this.indexDirty, index);\n      this.scheduleUpdate();\n    }\n  }\n  scheduleUpdate() {\n    clearTimeout(this.timerUpdate);\n    this.timerUpdate = setTimeout(() => this.updateVirtualScroll(), 100);\n  }\n  updateState() {\n    const shouldEnable = !!(this.scrollEl && this.cells.length > 0);\n    if (shouldEnable !== this.isEnabled) {\n      this.enableScrollEvents(shouldEnable);\n      if (shouldEnable) {\n        this.updateVirtualScroll();\n      }\n    }\n  }\n  calcCells() {\n    if (!this.items) {\n      return;\n    }\n    this.lastItemLen = this.items.length;\n    this.cells = calcCells(this.items, this.itemHeight, this.headerHeight, this.footerHeight, this.headerFn, this.footerFn, this.approxHeaderHeight, this.approxFooterHeight, this.approxItemHeight, 0, 0, this.lastItemLen);\n    this.indexDirty = 0;\n  }\n  getHeightIndex() {\n    if (this.indexDirty !== Infinity) {\n      this.calcHeightIndex(this.indexDirty);\n    }\n    return this.heightIndex;\n  }\n  calcHeightIndex(index = 0) {\n    // TODO: optimize, we don't need to calculate all the cells\n    this.heightIndex = resizeBuffer(this.heightIndex, this.cells.length);\n    this.totalHeight = calcHeightIndex(this.heightIndex, this.cells, index);\n    this.indexDirty = Infinity;\n  }\n  enableScrollEvents(shouldListen) {\n    if (this.rmEvent) {\n      this.rmEvent();\n      this.rmEvent = undefined;\n    }\n    const scrollEl = this.scrollEl;\n    if (scrollEl) {\n      this.isEnabled = shouldListen;\n      scrollEl.addEventListener('scroll', this.onScroll);\n      this.rmEvent = () => {\n        scrollEl.removeEventListener('scroll', this.onScroll);\n      };\n    }\n  }\n  renderVirtualNode(node) {\n    const { type, value, index } = node.cell;\n    switch (type) {\n      case CELL_TYPE_ITEM:\n        return this.renderItem(value, index);\n      case CELL_TYPE_HEADER:\n        return this.renderHeader(value, index);\n      case CELL_TYPE_FOOTER:\n        return this.renderFooter(value, index);\n    }\n  }\n  render() {\n    return (h(Host, { style: {\n        height: `${this.totalHeight}px`,\n      } }, this.renderItem && (h(VirtualProxy, { dom: this.virtualDom }, this.virtualDom.map((node) => this.renderVirtualNode(node))))));\n  }\n  get el() { return getElement(this); }\n  static get watchers() { return {\n    \"itemHeight\": [\"itemsChanged\"],\n    \"headerHeight\": [\"itemsChanged\"],\n    \"footerHeight\": [\"itemsChanged\"],\n    \"items\": [\"itemsChanged\"]\n  }; }\n};\nconst VirtualProxy = ({ dom }, children, utils) => {\n  return utils.map(children, (child, i) => {\n    const node = dom[i];\n    const vattrs = child.vattrs || {};\n    let classes = vattrs.class || '';\n    classes += 'virtual-item ';\n    if (!node.visible) {\n      classes += 'virtual-loading';\n    }\n    return Object.assign(Object.assign({}, child), { vattrs: Object.assign(Object.assign({}, vattrs), { class: classes, style: Object.assign(Object.assign({}, vattrs.style), { transform: `translate3d(0,${node.top}px,0)` }) }) });\n  });\n};\nVirtualScroll.style = virtualScrollCss;\n\nexport { VirtualScroll as ion_virtual_scroll 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