v13.0.0-39 -- distribution files

2017-12-05 17:06:12 -08:00
77 changed files with 2140 additions and 2283 deletions
--- a/README.md
+++ b/README.md
@@ -64,19 +64,6 @@ missing modules.
 <script src="./bower_components/yjs/y.js"></script>
 ```
 ### CDN
 ```
 <script src="https://cdn.jsdelivr.net/npm/yjs@12/src/y.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/y-array@10/dist/y-array.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/y-websockets-client@8/dist/y-websockets-client.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/y-memory@8/dist/y-memory.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/y-array@10/dist/y-array.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/y-map@10/dist/y-map.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/y-text@9/dist/y-text.js"></script>
 // ..
 // do the same for all modules you want to use
 ```
 ### Npm
 ```
 npm install --save yjs % add all y-* modules you want to use
--- a/examples/ace/index.html
+++ b/examples/ace/index.html
@@ -24,8 +24,7 @@
  <body>
    <div id="aceContainer"></div>
-    <script src="../../y.js"></script>
+    <script src="../bower_components/yjs/y.js"></script>
    <script src='../../../y-websockets-client/y-websockets-client.js'></script>
    <script src="../bower_components/ace-builds/src/ace.js"></script>
    <script src="./index.js"></script>
--- a/examples/ace/index.js
+++ b/examples/ace/index.js
@@ -1,17 +1,24 @@
 /* global Y, ace */
-let y = new Y('ace-example', {
+Y({
  db: {
    name: 'memory'
  },
  connector: {
    name: 'websockets-client',
-    url: 'http://127.0.0.1:1234'
+    room: 'ace-example'
  },
  sourceDir: '/bower_components',
  share: {
    ace: 'Text' // y.share.textarea is of type Y.Text
  }
 }).then(function (y) {
  window.yAce = y
  // bind the textarea to a shared text element
  var editor = ace.edit('aceContainer')
  editor.setTheme('ace/theme/chrome')
  editor.getSession().setMode('ace/mode/javascript')
  y.share.ace.bindAce(editor)
 })
 window.yAce = y
 // bind the textarea to a shared text element
 var editor = ace.edit('aceContainer')
 editor.setTheme('ace/theme/chrome')
 editor.getSession().setMode('ace/mode/javascript')
 y.define('ace', Y.Text).bindAce(editor)
--- a/examples/chat/index.html
+++ b/examples/chat/index.html
@@ -13,7 +13,7 @@
      <input type="submit" value="Send">
    </form>
    <script src="../../y.js"></script>
-    <script src='../../../y-websockets-client/y-websockets-client.js'></script>
+    <script src="../../../y-websockets-client/dist/y-websockets-client.js"></script>
    <script src="./index.js"></script>
  </body>
 </html>
--- a/examples/chat/index.js
+++ b/examples/chat/index.js
@@ -1,9 +1,10 @@
 /* global Y */
-let y = new Y('chat-example', {
+// initialize a shared object. This function call returns a promise!
 var y = new Y({
  connector: {
    name: 'websockets-client',
-    url: 'http://127.0.0.1:1234'
+    room: 'chat-example'
  }
 })
@@ -22,7 +23,6 @@ function appendMessage (message, position) {
  p.appendChild(document.createTextNode(message.message))
  chatcontainer.insertBefore(p, chatcontainer.children[position] || null)
 }
 // This function makes sure that only 7 messages exist in the chat history.
 // The rest is deleted
 function cleanupChat () {
@@ -30,17 +30,23 @@ function cleanupChat () {
    chatprotocol.delete(0, chatprotocol.length - 7)
  }
 }
 cleanupChat()
 // Insert the initial content
 chatprotocol.toArray().forEach(appendMessage)
 cleanupChat()
 // whenever content changes, make sure to reflect the changes in the DOM
 chatprotocol.observe(function (event) {
  if (event.type === 'insert') {
    for (let i = 0; i < event.length; i++) {
      appendMessage(event.values[i], event.index + i)
    }
  } else if (event.type === 'delete') {
    for (let i = 0; i < event.length; i++) {
      chatcontainer.children[event.index].remove()
    }
  }
  // concurrent insertions may result in a history > 7, so cleanup here
  cleanupChat()
  chatcontainer.innerHTML = ''
  chatprotocol.toArray().forEach(appendMessage)
 })
 document.querySelector('#chatform').onsubmit = function (event) {
  // the form is submitted
--- a/examples/codemirror/index.html
+++ b/examples/codemirror/index.html
@@ -5,8 +5,7 @@
  <body>
    <div id="codeMirrorContainer"></div>
-    <script src="../../y.js"></script>
+    <script src="../bower_components/yjs/y.js"></script>
    <script src='../../../y-websockets-client/y-websockets-client.js'></script>
    <script src="../bower_components/codemirror/lib/codemirror.js"></script>
    <script src="../bower_components/codemirror/mode/javascript/javascript.js"></script>
    <link rel="stylesheet" href="../bower_components/codemirror/lib/codemirror.css">
--- a/examples/codemirror/index.js
+++ b/examples/codemirror/index.js
@@ -1,16 +1,24 @@
 /* global Y, CodeMirror */
-let y = new Y('codemirror-example', {
+// initialize a shared object. This function call returns a promise!
 Y({
  db: {
    name: 'memory'
  },
  connector: {
    name: 'websockets-client',
-    url: 'http://127.0.0.1:1234'
+    room: 'codemirror-example'
  },
  sourceDir: '/bower_components',
  share: {
    codemirror: 'Text' // y.share.codemirror is of type Y.Text
  }
-})
+}).then(function (y) {
  window.yCodeMirror = y
-window.yCodeMirror = y
+  var editor = CodeMirror(document.querySelector('#codeMirrorContainer'), {
-
+    mode: 'javascript',
-var editor = CodeMirror(document.querySelector('#codeMirrorContainer'), {
+    lineNumbers: true
-  mode: 'javascript',
+  })
-  lineNumbers: true
+  y.share.codemirror.bindCodeMirror(editor)
 })
 y.define('codemirror', Y.Text).bindCodeMirror(editor)
--- a/examples/drawing/index.html
+++ b/examples/drawing/index.html
@@ -13,8 +13,11 @@
  <button type="button" id="clearDrawingCanvas">Clear Drawing</button>
  <svg id="drawingCanvas" viewbox="0 0 100 100" width="100%"></svg>
  <script src="../../y.js"></script>
-  <script src='../../../y-websockets-client/y-websockets-client.js'></script>
+  <script src="../../../y-array/y-array.js"></script>
-  <script src="../bower_components/d3/d3.min.js"></script>
+  <script src="../../../y-map/dist/y-map.js"></script>
  <script src="../../../y-memory/y-memory.js"></script>
  <script src="../../../y-websockets-client/y-websockets-client.js"></script>
  <script src="../bower_components/d3/d3.js"></script>
  <script src="./index.js"></script>
 </body>
 </html>
--- a/examples/drawing/index.js
+++ b/examples/drawing/index.js
@@ -1,74 +1,84 @@
 /* globals Y, d3 */
 'strict mode'
-let y = new Y('drawing-example', {
+Y({
  db: {
    name: 'memory'
  },
  connector: {
    name: 'websockets-client',
-    url: 'http://127.0.0.1:1234'
+    room: 'drawing-example',
    url: 'localhost:1234'
  },
  sourceDir: '/bower_components',
  share: {
    drawing: 'Array'
  }
-})
+}).then(function (y) {
  window.yDrawing = y
  var drawing = y.share.drawing
  var renderPath = d3.svg.line()
    .x(function (d) { return d[0] })
    .y(function (d) { return d[1] })
    .interpolate('basis')
-window.yDrawing = y
+  var svg = d3.select('#drawingCanvas')
-var drawing = y.define('drawing', Y.Array)
+    .call(d3.behavior.drag()
-var renderPath = d3.svg.line()
+      .on('dragstart', dragstart)
-  .x(function (d) { return d[0] })
+      .on('drag', drag)
-  .y(function (d) { return d[1] })
+      .on('dragend', dragend))
  .interpolate('basic')
-var svg = d3.select('#drawingCanvas')
+  // create line from a shared array object and update the line when the array changes
-  .call(d3.behavior.drag()
+  function drawLine (yarray) {
-    .on('dragstart', dragstart)
+    var line = svg.append('path').datum(yarray.toArray())
    .on('drag', drag)
    .on('dragend', dragend))
 // create line from a shared array object and update the line when the array changes
 function drawLine (yarray) {
  var line = svg.append('path').datum(yarray.toArray())
  line.attr('d', renderPath)
  yarray.observe(function (event) {
    line.remove()
    line = svg.append('path').datum(yarray.toArray())
    line.attr('d', renderPath)
-  })
+    yarray.observe(function (event) {
-}
+      // we only implement insert events that are appended to the end of the array
-// call drawLine every time an array is appended
+      event.values.forEach(function (value) {
-drawing.observe(function (event) {
+        line.datum().push(value)
-  event.removedElements.forEach(function () {
+      })
-    // if one is deleted, all will be deleted!!
+      line.attr('d', renderPath)
-    svg.selectAll('path').remove()
+    })
-  })
+  }
-  event.addedElements.forEach(function (path) {
+  // call drawLine every time an array is appended
-    drawLine(path)
+  y.share.drawing.observe(function (event) {
-  })
+    if (event.type === 'insert') {
-})
+      event.values.forEach(drawLine)
-// draw all existing content
+    } else {
-for (var i = 0; i < drawing.length; i++) {
+      // just remove all elements (thats what we do anyway)
-  drawLine(drawing.get(i))
+      svg.selectAll('path').remove()
-}
+    }
-
+  })
-// clear canvas on request
+  // draw all existing content
-document.querySelector('#clearDrawingCanvas').onclick = function () {
+  for (var i = 0; i < drawing.length; i++) {
-  drawing.delete(0, drawing.length)
+    drawLine(drawing.get(i))
 }
 var sharedLine = null
 function dragstart () {
  drawing.insert(drawing.length, [Y.Array])
  sharedLine = drawing.get(drawing.length - 1)
 }
 // After one dragged event is recognized, we ignore them for 33ms.
 var ignoreDrag = null
 function drag () {
  if (sharedLine != null && ignoreDrag == null) {
    ignoreDrag = window.setTimeout(function () {
      ignoreDrag = null
    }, 10)
    sharedLine.push([d3.mouse(this)])
  }
 }
-function dragend () {
+  // clear canvas on request
-  sharedLine = null
+  document.querySelector('#clearDrawingCanvas').onclick = function () {
-  window.clearTimeout(ignoreDrag)
+    drawing.delete(0, drawing.length)
-  ignoreDrag = null
+  }
-}
+
  var sharedLine = null
  function dragstart () {
    drawing.insert(drawing.length, [Y.Array])
    sharedLine = drawing.get(drawing.length - 1)
  }
  // After one dragged event is recognized, we ignore them for 33ms.
  var ignoreDrag = null
  function drag () {
    if (sharedLine != null && ignoreDrag == null) {
      ignoreDrag = window.setTimeout(function () {
        ignoreDrag = null
      }, 33)
      sharedLine.push([d3.mouse(this)])
    }
  }
  function dragend () {
    sharedLine = null
    window.clearTimeout(ignoreDrag)
    ignoreDrag = null
  }
 })
--- a/examples/html-editor-drawing-hook/index.html
+++ b/examples/html-editor-drawing-hook/index.html
@@ -1,36 +0,0 @@
 <!DOCTYPE html>
 <html>
 </head>
  <script src="../../y.js"></script>
  <script src='../../../y-websockets-client/y-websockets-client.js'></script>
  <script src="../bower_components/d3/d3.min.js"></script>
  <script src="./index.js"></script>
  <style>
    magic-drawing .drawingCanvas path {
      fill: none;
      stroke: blue;
      stroke-width: 2px;
      stroke-linejoin: round;
      stroke-linecap: round;
    }
    magic-drawing .drawingCanvas {
      width: 500px;
      height: 500px;
      cursor: default;
      padding:1px;
      border:1px solid #021a40;
    }
    magic-drawing .clearDrawingButton {
      position: absolute;
      top: 0;
      left: 0;
    }
    magic-drawing {
      position: relative;
      display: block;
    }
  </style>
 </head>
 <body contenteditable="true">
 </body>
 </html>
--- a/examples/html-editor-drawing-hook/index.js
+++ b/examples/html-editor-drawing-hook/index.js
@@ -1,132 +0,0 @@
 /* global Y, d3 */
 window.onload = function () {
  window.yXmlType.bindToDom(document.body)
 }
 window.addMagicDrawing = function addMagicDrawing () {
  let mt = document.createElement('magic-drawing')
  mt.dataset.yjsHook = 'magic-drawing'
  document.body.append(mt)
 }
 var renderPath = d3.svg.line()
  .x(function (d) { return d[0] })
  .y(function (d) { return d[1] })
  .interpolate('basic')
 function initDrawingBindings (type, dom) {
  dom.contentEditable = 'false'
  dom.dataset.yjsHook = 'magic-drawing'
  var drawing = type.get('drawing')
  if (drawing === undefined) {
    drawing = type.set('drawing', new Y.Array())
  }
  var canvas = dom.querySelector('.drawingCanvas')
  if (canvas == null) {
    canvas = document.createElementNS('http://www.w3.org/2000/svg', 'svg')
    canvas.setAttribute('class', 'drawingCanvas')
    canvas.setAttribute('viewbox', '0 0 100 100')
    dom.insertBefore(canvas, null)
  }
  var clearDrawingButton = dom.querySelector('.clearDrawingButton')
  if (clearDrawingButton == null) {
    clearDrawingButton = document.createElement('button')
    clearDrawingButton.setAttribute('type', 'button')
    clearDrawingButton.setAttribute('class', 'clearDrawingButton')
    clearDrawingButton.innerText = 'Clear Drawing'
    dom.insertBefore(clearDrawingButton, null)
  }
  var svg = d3.select(canvas)
    .call(d3.behavior.drag()
      .on('dragstart', dragstart)
      .on('drag', drag)
      .on('dragend', dragend))
  // create line from a shared array object and update the line when the array changes
  function drawLine (yarray, svg) {
    var line = svg.append('path').datum(yarray.toArray())
    line.attr('d', renderPath)
    yarray.observe(function (event) {
      line.remove()
      line = svg.append('path').datum(yarray.toArray())
      line.attr('d', renderPath)
    })
  }
  // call drawLine every time an array is appended
  drawing.observe(function (event) {
    event.removedElements.forEach(function () {
      // if one is deleted, all will be deleted!!
      svg.selectAll('path').remove()
    })
    event.addedElements.forEach(function (path) {
      drawLine(path, svg)
    })
  })
  // draw all existing content
  for (var i = 0; i < drawing.length; i++) {
    drawLine(drawing.get(i), svg)
  }
  // clear canvas on request
  clearDrawingButton.onclick = function () {
    drawing.delete(0, drawing.length)
  }
  var sharedLine = null
  function dragstart () {
    drawing.insert(drawing.length, [Y.Array])
    sharedLine = drawing.get(drawing.length - 1)
  }
  // After one dragged event is recognized, we ignore them for 33ms.
  var ignoreDrag = null
  function drag () {
    if (sharedLine != null && ignoreDrag == null) {
      ignoreDrag = window.setTimeout(function () {
        ignoreDrag = null
      }, 10)
      sharedLine.push([d3.mouse(this)])
    }
  }
  function dragend () {
    sharedLine = null
    window.clearTimeout(ignoreDrag)
    ignoreDrag = null
  }
 }
 Y.XmlHook.addHook('magic-drawing', {
  fillType: function (dom, type) {
    initDrawingBindings(type, dom)
  },
  createDom: function (type) {
    const dom = document.createElement('magic-drawing')
    initDrawingBindings(type, dom)
    return dom
  }
 })
 let y = new Y('html-editor-drawing-hook-example', {
  connector: {
    name: 'websockets-client',
    url: 'http://127.0.0.1:1234'
  }
 })
 window.yXml = y
 window.yXmlType = y.define('xml', Y.XmlFragment)
 window.undoManager = new Y.utils.UndoManager(window.yXmlType, {
  captureTimeout: 500
 })
 document.onkeydown = function interceptUndoRedo (e) {
  if (e.keyCode === 90 && e.metaKey) {
    if (!e.shiftKey) {
      window.undoManager.undo()
    } else {
      window.undoManager.redo()
    }
    e.preventDefault()
  }
 }
--- a/examples/html-editor/index.html
+++ b/examples/html-editor/index.html
@@ -1,8 +1,10 @@
 <!DOCTYPE html>
 <html>
 </head>
-  <script src="../../y.js"></script>
+  <!-- jquery is not required for y-xml. It is just here for convenience, and to test batch operations. -->
-  <script src='../../../y-websockets-client/y-websockets-client.js'></script>
+  <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
  <script src="../yjs-dist.js"></script>
  <script src="./canvasjs.min.js"></script>
  <script src="./index.js"></script>
 </head>
 <body contenteditable="true">
--- a/examples/html-editor/index.js
+++ b/examples/html-editor/index.js
@@ -1,17 +1,78 @@
-/* global Y */
+/* global Y, HTMLElement, customElements, CanvasJS */
 window.onload = function () {
  window.yXmlType.bindToDom(document.body)
  let mt = document.createElement('magic-table')
  mt.innerHTML = '<table><tr><th>Amount</th></tr><tr><td>1</td></tr><tr><td>1</td></tr></table>'
  document.body.append(mt)
 }
-let y = new Y('htmleditor', {
+class MagicTable extends HTMLElement {
-  connector: {
+  constructor () {
-    name: 'websockets-client',
+    super()
-    url: 'http://127.0.0.1:1234'
+    this.createShadowRoot()
  }
  get _yjsHook () {
    return 'magic-table'
  }
  showTable () {
    this.shadowRoot.innerHTML = ''
    this.shadowRoot.append(document.createElement('content'))
  }
  showDiagram () {
    let dataPoints = []
    this.querySelectorAll('td').forEach(td => {
      let number = Number(td.textContent)
      dataPoints.push({
        x: (dataPoints.length + 1) * 10,
        y: number,
        label: '<magic-table> content'
      })
    })
    this.shadowRoot.innerHTML = ''
    var chart = new CanvasJS.Chart(this.shadowRoot,
      {
        title: {
          text: 'Bar chart'
        },
        data: [
          {
            type: 'bar',
            dataPoints: dataPoints
          }
        ]
      })
    chart.render()
    // this.shadowRoot.innerHTML = '<p>dtrn</p>'
  }
 }
 customElements.define('magic-table', MagicTable)
 Y.XmlHook.addHook('magic-table', {
  fillType: function (dom, type) {
    type.set('table', new Y.XmlElement(dom.querySelector('table')))
  },
  createDom: function (type) {
    const table = type.get('table').getDom()
    const dom = document.createElement('magic-table')
    dom.insertBefore(table, null)
    return dom
  }
 })
-window.y = y
+// initialize a shared object. This function call returns a promise!
 let y = new Y({
  connector: {
    name: 'websockets-client',
    url: 'http://127.0.0.1:1234',
    room: 'html-editor-example6'
    // maxBufferLength: 100
  }
 })
 window.yXml = y
 window.yXmlType = y.define('xml', Y.XmlFragment)
 window.undoManager = new Y.utils.UndoManager(window.yXmlType, {
  captureTimeout: 500
--- a/examples/indexeddb/index.html
+++ b/examples/indexeddb/index.html
@@ -16,9 +16,6 @@
        width: 100%;
      }
    </style>
-    <script src="../../y.js"></script>
+    <script type="module" src="./index.js"></script>
    <script src='../../../y-websockets-client/y-websockets-client.js'></script>
    <script src='../../../y-indexeddb/y-indexeddb.js'></script>
    <script src="./index.js"></script>
  </body>
 </html>
--- a/examples/indexeddb/index.js
+++ b/examples/indexeddb/index.js
@@ -1,19 +1,24 @@
 /* global Y, CodeMirror */
-const persistence = new Y.IndexedDB()
+// initialize a shared object. This function call returns a promise!
-const connector = {
+Y({
  db: {
    name: 'memory'
  },
  connector: {
    name: 'websockets-client',
    room: 'codemirror-example'
  },
  sourceDir: '/bower_components',
  share: {
    codemirror: 'Text' // y.share.codemirror is of type Y.Text
  }
-}
+}).then(function (y) {
  window.yCodeMirror = y
-const y = new Y('codemirror-example', connector, persistence)
+  var editor = CodeMirror(document.querySelector('#codeMirrorContainer'), {
-window.yCodeMirror = y
+    mode: 'javascript',
-
+    lineNumbers: true
-var editor = CodeMirror(document.querySelector('#codeMirrorContainer'), {
+  })
-  mode: 'javascript',
+  y.share.codemirror.bindCodeMirror(editor)
  lineNumbers: true
 })
 y.define('codemirror', Y.Text).bindCodeMirror(editor)
--- a/examples/infiniteyjs/index.html
+++ b/examples/infiniteyjs/index.html
@@ -10,7 +10,7 @@
    .one {
      grid-column: 1 ;
    }
-    .two {
+    .two { 
      grid-column: 2;
    }
    .three {
@@ -49,7 +49,10 @@
    </div>
  </div>
  <script src="../../y.js"></script>
-  <script src='../../../y-websockets-client/y-websockets-client.js'></script>
+  <script src="../../../y-array/y-array.js"></script>
  <script src="../../../y-text/dist/y-text.js"></script>
  <script src="../../../y-memory/y-memory.js"></script>
  <script src="../../../y-websockets-client/y-websockets-client.js"></script>
  <script src="./index.js"></script>
 </body>
 </html>
--- a/examples/infiniteyjs/index.js
+++ b/examples/infiniteyjs/index.js
@@ -1,38 +1,64 @@
 /* global Y */
-function bindYjsInstance (y, suffix) {
+Y({
-  y.define('textarea', Y.Text).bind(document.getElementById('textarea' + suffix))
+  db: {
    name: 'memory'
  },
  connector: {
    name: 'websockets-client',
    room: 'Textarea-example',
    url: 'https://yjs-v13.herokuapp.com/'
  },
  share: {
    textarea: 'Text'
  }
 }).then(function (y) {
  window.y1 = y
  y.share.textarea.bind(document.getElementById('textarea1'))
 })
 Y({
  db: {
    name: 'memory'
  },
  connector: {
    name: 'websockets-client',
    room: 'Textarea-example',
    url: 'https://yjs-v13-second.herokuapp.com/'
  },
  share: {
    textarea: 'Text'
  }
 }).then(function (y) {
  window.y2 = y
  y.share.textarea.bind(document.getElementById('textarea2'))
  y.connector.socket.on('connection', function () {
-    document.getElementById('container' + suffix).removeAttribute('disconnected')
+    document.getElementById('container2').removeAttribute('disconnected')
  })
  y.connector.socket.on('disconnect', function () {
-    document.getElementById('container' + suffix).setAttribute('disconnected', true)
+    document.getElementById('container2').setAttribute('disconnected', true)
  })
-}
+})
-let y1 = new Y('infinite-example', {
+Y({
  db: {
    name: 'memory'
  },
  connector: {
    name: 'websockets-client',
-    url: 'http://127.0.0.1:1234'
+    room: 'Textarea-example',
    url: 'https://yjs-v13-third.herokuapp.com/'
  },
  share: {
    textarea: 'Text'
  }
 }).then(function (y) {
  window.y3 = y
  y.share.textarea.bind(document.getElementById('textarea3'))
  y.connector.socket.on('connection', function () {
    document.getElementById('container3').removeAttribute('disconnected')
  })
  y.connector.socket.on('disconnect', function () {
    document.getElementById('container3').setAttribute('disconnected', true)
  })
 })
 window.y1 = y1
 bindYjsInstance(y1, '1')
 let y2 = new Y('infinite-example', {
  connector: {
    name: 'websockets-client',
    url: 'http://127.0.0.1:1234'
  }
 })
 window.y2 = y2
 bindYjsInstance(y2, '2')
 let y3 = new Y('infinite-example', {
  connector: {
    name: 'websockets-client',
    url: 'http://127.0.0.1:1234'
  }
 })
 window.y3 = y3
 bindYjsInstance(y1, '3')
--- a/examples/jigsaw/index.html
+++ b/examples/jigsaw/index.html
@@ -17,7 +17,9 @@
 		</g>
  </svg>
  <script src="../../y.js"></script>
-  <script src='../../../y-websockets-client/y-websockets-client.js'></script>
+  <script src="../../../y-map/dist/y-map.js"></script>
  <script src="../../../y-memory/y-memory.js"></script>
  <script src="../../../y-websockets-client/y-websockets-client.js"></script>
  <script src="../bower_components/d3/d3.js"></script>
  <script src="./index.js"></script>
 </body>
--- a/examples/jigsaw/index.js
+++ b/examples/jigsaw/index.js
@@ -1,67 +1,74 @@
 /* @flow */
 /* global Y, d3 */
-let y = new Y('jigsaw-example', {
+// initialize a shared object. This function call returns a promise!
 Y({
  db: {
    name: 'memory'
  },
  connector: {
    name: 'websockets-client',
-    url: 'http://127.0.0.1:1234'
+    room: 'Puzzle-example',
    url: 'http://localhost:1234'
  },
  share: {
    piece1: 'Map',
    piece2: 'Map',
    piece3: 'Map',
    piece4: 'Map'
  }
-})
+}).then(function (y) {
  window.yJigsaw = y
  var origin // mouse start position - translation of piece
  var drag = d3.behavior.drag()
    .on('dragstart', function (params) {
      // get the translation of the element
      var translation = d3
        .select(this)
        .attr('transform')
        .slice(10, -1)
        .split(',')
        .map(Number)
      // mouse coordinates
      var mouse = d3.mouse(this.parentNode)
      origin = {
        x: mouse[0] - translation[0],
        y: mouse[1] - translation[1]
      }
    })
    .on('drag', function () {
      var mouse = d3.mouse(this.parentNode)
      var x = mouse[0] - origin.x // =^= mouse - mouse at dragstart + translation at dragstart
      var y = mouse[1] - origin.y
      d3.select(this).attr('transform', 'translate(' + x + ',' + y + ')')
    })
    .on('dragend', function (piece, i) {
      // save the current translation of the puzzle piece
      var mouse = d3.mouse(this.parentNode)
      var x = mouse[0] - origin.x
      var y = mouse[1] - origin.y
      piece.set('translation', {x: x, y: y})
    })
-let jigsaw = y.define('jigsaw', Y.Map)
+  var data = [y.share.piece1, y.share.piece2, y.share.piece3, y.share.piece4]
-window.yJigsaw = y
+  var pieces = d3.select(document.querySelector('#puzzle-example')).selectAll('path').data(data)
-var origin // mouse start position - translation of piece
+  pieces
-var drag = d3.behavior.drag()
+    .classed('draggable', true)
-  .on('dragstart', function (params) {
+    .attr('transform', function (piece) {
-    // get the translation of the element
+      var translation = piece.get('translation') || {x: 0, y: 0}
-    var translation = d3
+      return 'translate(' + translation.x + ',' + translation.y + ')'
-      .select(this)
+    }).call(drag)
      .attr('transform')
      .slice(10, -1)
      .split(',')
      .map(Number)
    // mouse coordinates
    var mouse = d3.mouse(this.parentNode)
    origin = {
      x: mouse[0] - translation[0],
      y: mouse[1] - translation[1]
    }
  })
  .on('drag', function () {
    var mouse = d3.mouse(this.parentNode)
    var x = mouse[0] - origin.x // =^= mouse - mouse at dragstart + translation at dragstart
    var y = mouse[1] - origin.y
    d3.select(this).attr('transform', 'translate(' + x + ',' + y + ')')
  })
  .on('dragend', function (piece, i) {
    // save the current translation of the puzzle piece
    var mouse = d3.mouse(this.parentNode)
    var x = mouse[0] - origin.x
    var y = mouse[1] - origin.y
    jigsaw.set(piece, {x: x, y: y})
  })
-var data = ['piece1', 'piece2', 'piece3', 'piece4']
+  data.forEach(function (piece) {
-var pieces = d3.select(document.querySelector('#puzzle-example')).selectAll('path').data(data)
+    piece.observe(function () {
-
+      // whenever a property of a piece changes, update the translation of the pieces
-pieces
+      pieces
-  .classed('draggable', true)
+        .transition()
-  .attr('transform', function (piece) {
+        .attr('transform', function (piece) {
-    var translation = piece.get('translation') || {x: 0, y: 0}
+          var translation = piece.get('translation') || {x: 0, y: 0}
-    return 'translate(' + translation.x + ',' + translation.y + ')'
+          return 'translate(' + translation.x + ',' + translation.y + ')'
-  }).call(drag)
+        })
-
+    })
 data.forEach(function (piece) {
  jigsaw.observe(function () {
    // whenever a property of a piece changes, update the translation of the pieces
    pieces
      .transition()
      .attr('transform', function (piece) {
        var translation = piece.get(piece)
        if (translation == null || typeof translation.x !== 'number' || typeof translation.y !== 'number') {
          translation = { x: 0, y: 0 }
        }
        return 'translate(' + translation.x + ',' + translation.y + ')'
      })
  })
 })
--- a/examples/monaco/index.html
+++ b/examples/monaco/index.html
@@ -13,8 +13,8 @@
        width: 100%;
      }
    </style>
-    <script src="../../y.js"></script>
+    <script src="../bower_components/yjs/y.js"></script>
-    <script src='../../../y-websockets-client/y-websockets-client.js'></script>
+    <script src="../bower_components/y-websockets-client/y-websockets-client.js"></script>
    <script src="../node_modules/monaco-editor/min/vs/loader.js"></script>
    <script src="./index.js"></script>
  </body>
--- a/examples/monaco/index.js
+++ b/examples/monaco/index.js
@@ -2,21 +2,29 @@
 require.config({ paths: { 'vs': '../node_modules/monaco-editor/min/vs' } })
 let y = new Y('monaco-example', {
  connector: {
    name: 'websockets-client',
    url: 'http://127.0.0.1:1234'
  }
 })
 require(['vs/editor/editor.main'], function () {
-  window.yMonaco = y
+  // Initialize a shared object. This function call returns a promise!
  Y({
    db: {
      name: 'memory'
    },
    connector: {
      name: 'websockets-client',
      room: 'monaco-example'
    },
    sourceDir: '/bower_components',
    share: {
      monaco: 'Text' // y.share.monaco is of type Y.Text
    }
  }).then(function (y) {
    window.yMonaco = y
-  // Create Monaco editor
+    // Create Monaco editor
-  var editor = monaco.editor.create(document.getElementById('monacoContainer'), {
+    var editor = monaco.editor.create(document.getElementById('monacoContainer'), {
-    language: 'javascript'
+      language: 'javascript'
    })
    // Bind to y.share.monaco
    y.share.monaco.bindMonaco(editor)
  })
  // Bind to y.share.monaco
  y.define('monaco', Y.Text).bindMonaco(editor)
 })
--- a/examples/package-lock.json
+++ b/examples/package-lock.json
--- a/examples/package.json
+++ b/examples/package.json
@@ -9,15 +9,12 @@
  "author": "Kevin Jahns",
  "license": "MIT",
  "dependencies": {
-    "monaco-editor": "^0.8.3",
+    "monaco-editor": "^0.8.3"
    "rollup": "^0.52.3"
  },
  "devDependencies": {
    "standard": "^10.0.2"
  },
  "standard": {
-    "ignore": [
+    "ignore": ["bower_components"]
      "bower_components"
    ]
  }
 }
--- a/examples/quill/index.html
+++ b/examples/quill/index.html
@@ -26,7 +26,10 @@
  <script src="../bower_components/quill/dist/quill.js"></script>
  -->
  <script src="../../y.js"></script>
-  <script src='../../../y-websockets-client/y-websockets-client.js'></script>
+  <script src="../../../y-array/y-array.js"></script>
  <script src="../../../y-richtext/dist/y-richtext.js"></script>
  <script src="../../../y-memory/y-memory.js"></script>
  <script src="../../../y-websockets-client/y-websockets-client.js"></script>
  <script src="./index.js"></script>
 </body>
 </html>
--- a/examples/rollup.config.js
+++ b/examples/rollup.config.js
@@ -4,7 +4,7 @@ import commonjs from 'rollup-plugin-commonjs'
 var pkg = require('./package.json')
 export default {
-  input: 'yjs-dist.mjs',
+  input: 'yjs-dist.esm',
  name: 'Y',
  output: {
    file: 'yjs-dist.js',
--- a/examples/textarea/index.html
+++ b/examples/textarea/index.html
@@ -1,9 +1,11 @@
 <!DOCTYPE html>
 <html>
 <body>
-  <textarea style="width:80%;" rows=40 autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"></textarea>
+  <textarea style="width:80%;" rows=40 id="textfield" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"></textarea>
  <script src="../../y.js"></script>
-  <script src='../../../y-websockets-client/y-websockets-client.js'></script>
+  <script src="../../../y-array/y-array.js"></script>
  <script src="../../../y-text/y-text.js"></script>
  <script src="../../../y-websockets-client/y-websockets-client.js"></script>
  <script src="./index.js"></script>
 </body>
 </html>
--- a/examples/textarea/index.js
+++ b/examples/textarea/index.js
@@ -1,15 +1,23 @@
 /* global Y */
-let y = new Y('textarea-example', {
+// initialize a shared object. This function call returns a promise!
 Y({
  db: {
    name: 'memory'
  },
  connector: {
    name: 'websockets-client',
-    url: 'http://127.0.0.1:1234'
+    room: 'Textarea-example2',
-  }
+    // url: '//localhost:1234',
    url: 'https://yjs-v13.herokuapp.com/'
  },
  share: {
    textarea: 'Text'
  },
  timeout: 5000 // reject if no connection was established within 5 seconds
 }).then(function (y) {
  window.yTextarea = y
  // bind the textarea to a shared text element
  y.share.textarea.bind(document.getElementById('textfield'))
 })
 window.yTextarea = y
 // bind the textarea to a shared text element
 let type = y.define('textarea', Y.Text)
 let textarea = document.querySelector('textarea')
 window.binding = new Y.TextareaBinding(type, textarea)
--- a/examples/xml/index.html
+++ b/examples/xml/index.html
@@ -3,8 +3,7 @@
 </head>
  <!-- jquery is not required for y-xml. It is just here for convenience, and to test batch operations. -->
  <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
-  <script src="../../y.js"></script>
+  <script src="../yjs-dist.js"></script>
  <script src='../../../y-websockets-client/y-websockets-client.js'></script>
  <script src="./index.js"></script>
 </head>
 <body>
--- a/examples/xml/index.js
+++ b/examples/xml/index.js
@@ -1,13 +1,23 @@
 /* global Y */
-let y = new Y('xml-example', {
+// initialize a shared object. This function call returns a promise!
 Y({
  db: {
    name: 'memory'
  },
  connector: {
    name: 'websockets-client',
-    url: 'http://127.0.0.1:1234'
+    // url: 'http://127.0.0.1:1234',
    url: 'http://192.168.178.81:1234',
    room: 'Xml-example'
  },
  sourceDir: '/bower_components',
  share: {
    xml: 'Xml("p")' // y.share.xml is of type Y.Xml with tagname "p"
  }
 }).then(function (y) {
  window.yXml = y
  // bind xml type to a dom, and put it in body
  window.sharedDom = y.share.xml.getDom()
  document.body.appendChild(window.sharedDom)
 })
 window.yXml = y
 // bind xml type to a dom, and put it in body
 window.sharedDom = y.define('xml', Y.XmlElement).getDom()
 document.body.appendChild(window.sharedDom)
--- a/examples/yjs-dist.esm
+++ b/examples/yjs-dist.esm
@@ -1,9 +1,7 @@
 import Y from '../src/Y.js'
 import yWebsocketsClient from '../../y-websockets-client/src/y-websockets-client.js'
 import extendYIndexedDBPersistence from '../../y-indexeddb/src/y-indexeddb.js'
 Y.extend(yWebsocketsClient)
 extendYIndexedDBPersistence(Y)
 export default Y
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
  "name": "yjs",
-  "version": "13.0.0-51",
+  "version": "13.0.0-39",
  "lockfileVersion": 1,
  "requires": true,
  "dependencies": {
@@ -1039,7 +1039,7 @@
      "requires": {
        "anymatch": "1.3.0",
        "async-each": "1.0.1",
-        "fsevents": "1.1.3",
+        "fsevents": "1.1.2",
        "glob-parent": "2.0.0",
        "inherits": "2.0.3",
        "is-binary-path": "1.0.1",
@@ -1092,6 +1092,12 @@
      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
      "dev": true
    },
    "colors": {
      "version": "1.1.2",
      "resolved": "https://registry.npmjs.org/colors/-/colors-1.1.2.tgz",
      "integrity": "sha1-FopHAXVran9RoSzgyXv6KMCE7WM=",
      "dev": true
    },
    "commander": {
      "version": "2.10.0",
      "resolved": "https://registry.npmjs.org/commander/-/commander-2.10.0.tgz",
@@ -1255,6 +1261,16 @@
      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
      "dev": true
    },
    "cors": {
      "version": "2.8.3",
      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.3.tgz",
      "integrity": "sha1-TPeOHSMymnSWsvwiJbd8pbteuAI=",
      "dev": true,
      "requires": {
        "object-assign": "4.1.1",
        "vary": "1.1.1"
      }
    },
    "currently-unhandled": {
      "version": "0.4.1",
      "resolved": "https://registry.npmjs.org/currently-unhandled/-/currently-unhandled-0.4.1.tgz",
@@ -1767,6 +1783,12 @@
      "integrity": "sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs=",
      "dev": true
    },
    "etag": {
      "version": "1.8.0",
      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.0.tgz",
      "integrity": "sha1-b2Ma7zNtbEY2K1F2QETOIWvjwFE=",
      "dev": true
    },
    "event-emitter": {
      "version": "0.3.5",
      "resolved": "https://registry.npmjs.org/event-emitter/-/event-emitter-0.3.5.tgz",
@@ -1777,6 +1799,21 @@
        "es5-ext": "0.10.23"
      }
    },
    "event-stream": {
      "version": "3.3.4",
      "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-3.3.4.tgz",
      "integrity": "sha1-SrTJoPWlTbkzi0w02Gv86PSzVXE=",
      "dev": true,
      "requires": {
        "duplexer": "0.1.1",
        "from": "0.1.7",
        "map-stream": "0.1.0",
        "pause-stream": "0.0.11",
        "split": "0.3.3",
        "stream-combiner": "0.0.4",
        "through": "2.3.8"
      }
    },
    "exit-hook": {
      "version": "1.1.1",
      "resolved": "https://registry.npmjs.org/exit-hook/-/exit-hook-1.1.1.tgz",
@@ -1834,6 +1871,11 @@
      "integrity": "sha1-ysNCuPqJAm7+c6Jg/p9rgE9J5H8=",
      "dev": true
    },
    "fast-diff": {
      "version": "1.1.2",
      "resolved": "https://registry.npmjs.org/fast-diff/-/fast-diff-1.1.2.tgz",
      "integrity": "sha512-KaJUt+M9t1qaIteSvjc6P3RbMdXsNhK61GRftR6SNxqmhthcd9MGIi4T+o0jD8LUSpSnSKXE20nLtJ3fOHxQig=="
    },
    "fast-levenshtein": {
      "version": "2.0.6",
      "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
@@ -1967,6 +2009,12 @@
      "integrity": "sha1-C+4AUBiusmDQo6865ljdATbsG5k=",
      "dev": true
    },
    "fresh": {
      "version": "0.5.0",
      "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.0.tgz",
      "integrity": "sha1-9HTKXmqSRtb9jglTz6m5yAWvp44=",
      "dev": true
    },
    "from": {
      "version": "0.1.7",
      "resolved": "https://registry.npmjs.org/from/-/from-0.1.7.tgz",
@@ -1992,14 +2040,14 @@
      "dev": true
    },
    "fsevents": {
-      "version": "1.1.3",
+      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.1.3.tgz",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.1.2.tgz",
-      "integrity": "sha512-WIr7iDkdmdbxu/Gh6eKEZJL6KPE74/5MEsf2whTOFNxbIoIixogroLdKYqB6FDav4Wavh/lZdzzd3b2KxIXC5Q==",
+      "integrity": "sha512-Sn44E5wQW4bTHXvQmvSHwqbuiXtduD6Rrjm2ZtUEGbyrig+nUH3t/QD4M4/ZXViY556TBpRgZkHLDx3JxPwxiw==",
      "dev": true,
      "optional": true,
      "requires": {
-        "nan": "2.8.0",
+        "nan": "2.7.0",
-        "node-pre-gyp": "0.6.39"
+        "node-pre-gyp": "0.6.36"
      },
      "dependencies": {
        "abbrev": {
@@ -2157,6 +2205,7 @@
          "version": "2.0.5",
          "bundled": true,
          "dev": true,
          "optional": true,
          "requires": {
            "boom": "2.10.1"
          }
@@ -2204,12 +2253,6 @@
          "dev": true,
          "optional": true
        },
        "detect-libc": {
          "version": "1.0.2",
          "bundled": true,
          "dev": true,
          "optional": true
        },
        "ecc-jsbn": {
          "version": "0.1.1",
          "bundled": true,
@@ -2351,6 +2394,7 @@
          "version": "3.1.3",
          "bundled": true,
          "dev": true,
          "optional": true,
          "requires": {
            "boom": "2.10.1",
            "cryptiles": "2.0.5",
@@ -2522,13 +2566,11 @@
          "optional": true
        },
        "node-pre-gyp": {
-          "version": "0.6.39",
+          "version": "0.6.36",
          "bundled": true,
          "dev": true,
          "optional": true,
          "requires": {
            "detect-libc": "1.0.2",
            "hawk": "3.1.3",
            "mkdirp": "0.5.1",
            "nopt": "4.0.1",
            "npmlog": "4.1.0",
@@ -2736,6 +2778,7 @@
          "version": "1.0.9",
          "bundled": true,
          "dev": true,
          "optional": true,
          "requires": {
            "hoek": "2.16.3"
          }
@@ -3496,7 +3539,7 @@
        "chokidar": "1.7.0",
        "colors": "1.1.2",
        "connect": "3.5.1",
-        "cors": "2.8.4",
+        "cors": "2.8.3",
        "event-stream": "3.3.4",
        "faye-websocket": "0.11.1",
        "http-auth": "3.1.3",
@@ -3504,127 +3547,15 @@
        "object-assign": "4.1.1",
        "opn": "5.1.0",
        "proxy-middleware": "0.15.0",
-        "send": "0.16.1",
+        "send": "0.15.3",
        "serve-index": "1.9.0"
      },
      "dependencies": {
        "colors": {
          "version": "1.1.2",
          "resolved": "https://registry.npmjs.org/colors/-/colors-1.1.2.tgz",
          "integrity": "sha1-FopHAXVran9RoSzgyXv6KMCE7WM=",
          "dev": true
        },
        "cors": {
          "version": "2.8.4",
          "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.4.tgz",
          "integrity": "sha1-K9OB8usgECAQXNUOpZ2mMJBpRoY=",
          "dev": true,
          "requires": {
            "object-assign": "4.1.1",
            "vary": "1.1.1"
          }
        },
        "debug": {
          "version": "2.6.9",
          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
          "dev": true,
          "requires": {
            "ms": "2.0.0"
          }
        },
        "depd": {
          "version": "1.1.1",
          "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.1.tgz",
          "integrity": "sha1-V4O04cRZ8G+lyif5kfPQbnoxA1k=",
          "dev": true
        },
        "etag": {
          "version": "1.8.1",
          "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
          "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=",
          "dev": true
        },
        "event-stream": {
          "version": "3.3.4",
          "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-3.3.4.tgz",
          "integrity": "sha1-SrTJoPWlTbkzi0w02Gv86PSzVXE=",
          "dev": true,
          "requires": {
            "duplexer": "0.1.1",
            "from": "0.1.7",
            "map-stream": "0.1.0",
            "pause-stream": "0.0.11",
            "split": "0.3.3",
            "stream-combiner": "0.0.4",
            "through": "2.3.8"
          }
        },
        "fresh": {
          "version": "0.5.2",
          "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
          "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac=",
          "dev": true
        },
        "http-errors": {
          "version": "1.6.2",
          "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.2.tgz",
          "integrity": "sha1-CgAsyFcHGSp+eUbO7cERVfYOxzY=",
          "dev": true,
          "requires": {
            "depd": "1.1.1",
            "inherits": "2.0.3",
            "setprototypeof": "1.0.3",
            "statuses": "1.3.1"
          }
        },
        "mime": {
          "version": "1.4.1",
          "resolved": "https://registry.npmjs.org/mime/-/mime-1.4.1.tgz",
          "integrity": "sha512-KI1+qOZu5DcW6wayYHSzR/tXKCDC5Om4s1z2QJjDULzLcmf3DvzS7oluY4HCTrc+9FiKmWUgeNLg7W3uIQvxtQ==",
          "dev": true
        },
        "object-assign": {
          "version": "4.1.1",
          "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
          "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=",
          "dev": true
        },
        "opn": {
          "version": "5.1.0",
          "resolved": "https://registry.npmjs.org/opn/-/opn-5.1.0.tgz",
          "integrity": "sha512-iPNl7SyM8L30Rm1sjGdLLheyHVw5YXVfi3SKWJzBI7efxRwHojfRFjwE/OLM6qp9xJYMgab8WicTU1cPoY+Hpg==",
          "dev": true,
          "requires": {
            "is-wsl": "1.1.0"
          }
        },
        "proxy-middleware": {
          "version": "0.15.0",
          "resolved": "https://registry.npmjs.org/proxy-middleware/-/proxy-middleware-0.15.0.tgz",
          "integrity": "sha1-o/3xvvtzD5UZZYcqwvYHTGFHelY=",
          "dev": true
        },
        "send": {
          "version": "0.16.1",
          "resolved": "https://registry.npmjs.org/send/-/send-0.16.1.tgz",
          "integrity": "sha512-ElCLJdJIKPk6ux/Hocwhk7NFHpI3pVm/IZOYWqUmoxcgeyM+MpxHHKhb8QmlJDX1pU6WrgaHBkVNm73Sv7uc2A==",
          "dev": true,
          "requires": {
            "debug": "2.6.9",
            "depd": "1.1.1",
            "destroy": "1.0.4",
            "encodeurl": "1.0.1",
            "escape-html": "1.0.3",
            "etag": "1.8.1",
            "fresh": "0.5.2",
            "http-errors": "1.6.2",
            "mime": "1.4.1",
            "ms": "2.0.0",
            "on-finished": "2.3.0",
            "range-parser": "1.2.0",
            "statuses": "1.3.1"
          }
        }
      }
    },
@@ -3780,6 +3711,12 @@
        "regex-cache": "0.4.3"
      }
    },
    "mime": {
      "version": "1.3.4",
      "resolved": "https://registry.npmjs.org/mime/-/mime-1.3.4.tgz",
      "integrity": "sha1-EV+eO2s9rylZmDyzjxSaLUDrXVM=",
      "dev": true
    },
    "mime-db": {
      "version": "1.27.0",
      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.27.0.tgz",
@@ -3844,9 +3781,9 @@
      "dev": true
    },
    "nan": {
-      "version": "2.8.0",
+      "version": "2.7.0",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.8.0.tgz",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.7.0.tgz",
-      "integrity": "sha1-7XFfP+neArV6XmJS2QqWZ14fCFo=",
+      "integrity": "sha1-2Vv3IeyHfgjbJ27T/G63j5CDrUY=",
      "dev": true,
      "optional": true
    },
@@ -3952,6 +3889,15 @@
      "integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k=",
      "dev": true
    },
    "opn": {
      "version": "5.1.0",
      "resolved": "https://registry.npmjs.org/opn/-/opn-5.1.0.tgz",
      "integrity": "sha512-iPNl7SyM8L30Rm1sjGdLLheyHVw5YXVfi3SKWJzBI7efxRwHojfRFjwE/OLM6qp9xJYMgab8WicTU1cPoY+Hpg==",
      "dev": true,
      "requires": {
        "is-wsl": "1.1.0"
      }
    },
    "optionator": {
      "version": "0.8.2",
      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.2.tgz",
@@ -4199,6 +4145,12 @@
      "integrity": "sha1-4mDHj2Fhzdmw5WzD4Khd4Xx6V74=",
      "dev": true
    },
    "proxy-middleware": {
      "version": "0.15.0",
      "resolved": "https://registry.npmjs.org/proxy-middleware/-/proxy-middleware-0.15.0.tgz",
      "integrity": "sha1-o/3xvvtzD5UZZYcqwvYHTGFHelY=",
      "dev": true
    },
    "randomatic": {
      "version": "1.1.7",
      "resolved": "https://registry.npmjs.org/randomatic/-/randomatic-1.1.7.tgz",
@@ -4674,6 +4626,38 @@
      "integrity": "sha1-myzl094C0XxgEq0yaqa00M9U+U8=",
      "dev": true
    },
    "send": {
      "version": "0.15.3",
      "resolved": "https://registry.npmjs.org/send/-/send-0.15.3.tgz",
      "integrity": "sha1-UBP5+ZAj31DRvZiSwZ4979HVMwk=",
      "dev": true,
      "requires": {
        "debug": "2.6.7",
        "depd": "1.1.0",
        "destroy": "1.0.4",
        "encodeurl": "1.0.1",
        "escape-html": "1.0.3",
        "etag": "1.8.0",
        "fresh": "0.5.0",
        "http-errors": "1.6.1",
        "mime": "1.3.4",
        "ms": "2.0.0",
        "on-finished": "2.3.0",
        "range-parser": "1.2.0",
        "statuses": "1.3.1"
      },
      "dependencies": {
        "debug": {
          "version": "2.6.7",
          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.7.tgz",
          "integrity": "sha1-krrR9tBbu2u6Isyoi80OyJTChh4=",
          "dev": true,
          "requires": {
            "ms": "2.0.0"
          }
        }
      }
    },
    "serve-index": {
      "version": "1.9.0",
      "resolved": "https://registry.npmjs.org/serve-index/-/serve-index-1.9.0.tgz",
@@ -4895,6 +4879,16 @@
        "strip-ansi": "3.0.1"
      }
    },
    "string.fromcodepoint": {
      "version": "0.2.1",
      "resolved": "https://registry.npmjs.org/string.fromcodepoint/-/string.fromcodepoint-0.2.1.tgz",
      "integrity": "sha1-jZeDM8C8klOPUPOD5IiPPlYZ1lM="
    },
    "string.prototype.codepointat": {
      "version": "0.2.0",
      "resolved": "https://registry.npmjs.org/string.prototype.codepointat/-/string.prototype.codepointat-0.2.0.tgz",
      "integrity": "sha1-aybpvTr8qnvjtCabUm3huCAArHg="
    },
    "string_decoder": {
      "version": "1.0.3",
      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
@@ -5115,6 +5109,20 @@
      "integrity": "sha1-K1viOjK2Onyd640PKNSFcko98ZA=",
      "dev": true
    },
    "utf-8": {
      "version": "1.0.0",
      "resolved": "https://registry.npmjs.org/utf-8/-/utf-8-1.0.0.tgz",
      "integrity": "sha1-QpwJ+xrDLOuvVllh7aSMs/RSIZc=",
      "requires": {
        "string.fromcodepoint": "0.2.1",
        "string.prototype.codepointat": "0.2.0"
      }
    },
    "utf8": {
      "version": "2.1.2",
      "resolved": "https://registry.npmjs.org/utf8/-/utf8-2.1.2.tgz",
      "integrity": "sha1-H6DZJw6b6FDZsFAn9jUZv0ZFfZY="
    },
    "util-deprecate": {
      "version": "1.0.2",
      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "yjs",
-  "version": "13.0.0-51",
+  "version": "13.0.0-39",
  "description": "A framework for real-time p2p shared editing on any data",
  "main": "./y.node.js",
  "browser": "./y.js",
@@ -65,6 +65,9 @@
    "tag-dist-files": "^0.1.6"
  },
  "dependencies": {
-    "debug": "^2.6.8"
+    "debug": "^2.6.8",
    "fast-diff": "^1.1.2",
    "utf-8": "^1.0.0",
    "utf8": "^2.1.2"
  }
 }
--- a/rollup.test.js
+++ b/rollup.test.js
@@ -3,7 +3,7 @@ import commonjs from 'rollup-plugin-commonjs'
 import multiEntry from 'rollup-plugin-multi-entry'
 export default {
-  input: 'test/index.js',
+  input: 'test/y-xml.tests.js',
  name: 'y-tests',
  sourcemap: true,
  output: {
@@ -11,12 +11,12 @@ export default {
    format: 'umd'
  },
  plugins: [
    multiEntry(),
    nodeResolve({
      main: true,
      module: true,
      browser: true
    }),
-    commonjs()
+    commonjs(),
    multiEntry()
  ]
 }
--- a/src/Binary/Decoder.js
+++ b/src/Binary/Decoder.js
@@ -1,3 +1,4 @@
 import utf8 from 'utf-8'
 import ID from '../Util/ID.js'
 import { default as RootID, RootFakeUserID } from '../Util/RootID.js'
@@ -90,8 +91,7 @@ export default class BinaryDecoder {
    for (let i = 0; i < len; i++) {
      bytes[i] = this.uint8arr[this.pos++]
    }
-    let encodedString = String.fromCodePoint(...bytes)
+    return utf8.getStringFromBytes(bytes)
    return decodeURIComponent(escape(encodedString))
  }
  /**
   *  Look ahead and read varString without incrementing position
--- a/src/Binary/Encoder.js
+++ b/src/Binary/Encoder.js
@@ -1,3 +1,4 @@
 import utf8 from 'utf-8'
 import { RootFakeUserID } from '../Util/RootID.js'
 const bits7 = 0b1111111
@@ -61,8 +62,7 @@ export default class BinaryEncoder {
  }
  writeVarString (str) {
-    let encodedString = unescape(encodeURIComponent(str))
+    let bytes = utf8.setBytesFromString(str)
    let bytes = encodedString.split('').map(c => c.codePointAt())
    let len = bytes.length
    this.writeVarUint(len)
    for (let i = 0; i < len; i++) {
--- a/src/Binding/Binding.js
+++ b/src/Binding/Binding.js
@@ -1,14 +0,0 @@
 import { createMutualExclude } from '../Util/mutualExclude.js'
 export default class Binding {
  constructor (type, target) {
    this.type = type
    this.target = target
    this._mutualExclude = createMutualExclude()
  }
  destroy () {
    this.type = null
    this.target = null
  }
 }
--- a/src/Binding/DomBinding.js
+++ b/src/Binding/DomBinding.js
--- a/src/Binding/TextareaBinding.js
+++ b/src/Binding/TextareaBinding.js
@@ -1,45 +0,0 @@
 import Binding from './Binding.js'
 import simpleDiff from '../Util/simpleDiff.js'
 import { getRelativePosition, fromRelativePosition } from '../Util/relativePosition.js'
 function typeObserver () {
  this._mutualExclude(() => {
    const textarea = this.target
    const textType = this.type
    const relativeStart = getRelativePosition(textType, textarea.selectionStart)
    const relativeEnd = getRelativePosition(textType, textarea.selectionEnd)
    textarea.value = textType.toString()
    const start = fromRelativePosition(textType._y, relativeStart)
    const end = fromRelativePosition(textType._y, relativeEnd)
    textarea.setSelectionRange(start, end)
  })
 }
 function domObserver () {
  this._mutualExclude(() => {
    let diff = simpleDiff(this.type.toString(), this.target.value)
    this.type.delete(diff.pos, diff.remove)
    this.type.insert(diff.pos, diff.insert)
  })
 }
 export default class TextareaBinding extends Binding {
  constructor (textType, domTextarea) {
    // Binding handles textType as this.type and domTextarea as this.target
    super(textType, domTextarea)
    // set initial value
    domTextarea.value = textType.toString()
    // Observers are handled by this class
    this._typeObserver = typeObserver.bind(this)
    this._domObserver = domObserver.bind(this)
    textType.observe(this._typeObserver)
    domTextarea.addEventListener('input', this._domObserver)
  }
  destroy () {
    // Remove everything that is handled by this class
    this.type.unobserve(this._typeObserver)
    this.target.unobserve(this._domObserver)
    super.destroy()
  }
 }
--- a/src/Connector.js
+++ b/src/Connector.js
@@ -132,7 +132,6 @@ export default class AbstractConnector {
        f()
      }
      this.whenSyncedListeners = []
      this.y._setContentReady()
      this.y.emit('synced')
    }
  }
@@ -269,7 +268,7 @@ export default class AbstractConnector {
        if (messageType === 'sync step 2' && senderConn.auth === 'write') {
          readSyncStep2(decoder, encoder, y, senderConn, sender)
        } else if (messageType === 'update' && (skipAuth || senderConn.auth === 'write')) {
-          integrateRemoteStructs(y, decoder)
+          integrateRemoteStructs(decoder, encoder, y, senderConn, sender)
        } else {
          throw new Error('Unable to receive message')
        }
--- a/src/MessageHandler/binaryEncode.js
+++ b/src/MessageHandler/binaryEncode.js
@@ -1,16 +0,0 @@
 import { writeStructs } from './syncStep1.js'
 import { integrateRemoteStructs } from './integrateRemoteStructs.js'
 import { readDeleteSet, writeDeleteSet } from './deleteSet.js'
 import BinaryEncoder from '../Binary/Encoder.js'
 export function fromBinary (y, decoder) {
  integrateRemoteStructs(y, decoder)
  readDeleteSet(y, decoder)
 }
 export function toBinary (y) {
  let encoder = new BinaryEncoder()
  writeStructs(y, encoder, new Map())
  writeDeleteSet(y, encoder)
  return encoder
 }
--- a/src/MessageHandler/integrateRemoteStructs.js
+++ b/src/MessageHandler/integrateRemoteStructs.js
@@ -65,7 +65,7 @@ export function stringifyStructs (y, decoder, strBuilder) {
  }
 }
-export function integrateRemoteStructs (y, decoder) {
+export function integrateRemoteStructs (decoder, encoder, y) {
  const len = decoder.readUint32()
  for (let i = 0; i < len; i++) {
    let reference = decoder.readVarUint()
--- a/src/MessageHandler/syncStep1.js
+++ b/src/MessageHandler/syncStep1.js
@@ -30,7 +30,7 @@ export function sendSyncStep1 (connector, syncUser) {
  connector.send(syncUser, encoder.createBuffer())
 }
-export function writeStructs (y, encoder, ss) {
+export default function writeStructs (encoder, decoder, y, ss) {
  const lenPos = encoder.pos
  encoder.writeUint32(0)
  let len = 0
@@ -60,7 +60,7 @@ export function readSyncStep1 (decoder, encoder, y, senderConn, sender) {
  encoder.writeVarString('sync step 2')
  encoder.writeVarString(y.connector.authInfo || '')
  const ss = readStateSet(decoder)
-  writeStructs(y, encoder, ss)
+  writeStructs(encoder, decoder, y, ss)
  writeDeleteSet(y, encoder)
  y.connector.send(senderConn.uid, encoder.createBuffer())
  senderConn.receivedSyncStep2 = true
--- a/src/MessageHandler/syncStep2.js
+++ b/src/MessageHandler/syncStep2.js
@@ -22,7 +22,7 @@ export function stringifySyncStep2 (y, decoder, strBuilder) {
 }
 export function readSyncStep2 (decoder, encoder, y, senderConn, sender) {
-  integrateRemoteStructs(y, decoder)
+  integrateRemoteStructs(decoder, encoder, y)
  readDeleteSet(y, decoder)
  y.connector._setSyncedWith(sender)
 }
--- a/src/Persistence.js
+++ b/src/Persistence.js
@@ -1,119 +1,47 @@
-import BinaryEncoder from './Binary/Encoder.js'
+// import BinaryEncoder from './Binary/Encoder.js'
 import BinaryDecoder from './Binary/Decoder.js'
 import { toBinary, fromBinary } from './MessageHandler/binaryEncode.js'
 import { integrateRemoteStructs } from './MessageHandler/integrateRemoteStructs.js'
 import { createMutualExclude } from './Util/mutualExclude.js'
-function getFreshCnf () {
+export default function extendPersistence (Y) {
-  let buffer = new BinaryEncoder()
+  class AbstractPersistence {
-  buffer.writeUint32(0)
+    constructor (y, opts) {
-  return {
+      this.y = y
-    len: 0,
+      this.opts = opts
-    buffer
+      this.saveOperationsBuffer = []
-  }
+      this.log = Y.debug('y:persistence')
 }
 export default class AbstractPersistence {
  constructor (opts) {
    this.opts = opts
    this.ys = new Map()
  }
  _init (y) {
    let cnf = this.ys.get(y)
    if (cnf === undefined) {
      cnf = getFreshCnf()
      cnf.mutualExclude = createMutualExclude()
      this.ys.set(y, cnf)
      return this.init(y).then(() => {
        y.on('afterTransaction', (y, transaction) => {
          let cnf = this.ys.get(y)
          if (cnf.len > 0) {
            cnf.buffer.setUint32(0, cnf.len)
            this.saveUpdate(y, cnf.buffer.createBuffer(), transaction)
            let _cnf = getFreshCnf()
            for (let key in _cnf) {
              cnf[key] = _cnf[key]
            }
          }
        })
        return this.retrieve(y)
      }).then(function () {
        return Promise.resolve(cnf)
      })
    } else {
      return Promise.resolve(cnf)
    }
  }
  deinit (y) {
    this.ys.delete(y)
    y.persistence = null
  }
-  destroy () {
+    saveToMessageQueue (binary) {
-    this.ys = null
+      this.log('Room %s: Save message to message queue', this.y.options.connector.room)
-  }
+    }
-  /**
+    saveOperations (ops) {
-   * Remove all persisted data that belongs to a room.
+      ops = ops.map(function (op) {
-   * Automatically destroys all Yjs all Yjs instances that persist to
+        return Y.Struct[op.struct].encode(op)
-   * the room. If `destroyYjsInstances = false` the persistence functionality
+      })
-   * will be removed from the Yjs instances.
+      /*
-   *
+      const saveOperations = () => {
-   * ** Must be overwritten! **
+        if (this.saveOperationsBuffer.length > 0) {
-   */
+          let encoder = new BinaryEncoder()
-  removePersistedData (room, destroyYjsInstances = true) {
+          encoder.writeVarString(this.opts.room)
-    this.ys.forEach((cnf, y) => {
+          encoder.writeVarString('update')
-      if (y.room === room) {
+          let ops = this.saveOperationsBuffer
-        if (destroyYjsInstances) {
+          this.saveOperationsBuffer = []
-          y.destroy()
+          let length = ops.length
-        } else {
+          encoder.writeUint32(length)
-          this.deinit(y)
+          for (var i = 0; i < length; i++) {
            let op = ops[i]
            Y.Struct[op.struct].binaryEncode(encoder, op)
          }
          this.saveToMessageQueue(encoder.createBuffer())
        }
      }
-    })
+      */
-  }
+      if (this.saveOperationsBuffer.length === 0) {
-
+        this.saveOperationsBuffer = ops
-  /* overwrite */
+      } else {
-  saveUpdate (buffer) {
+        this.saveOperationsBuffer = this.saveOperationsBuffer.concat(ops)
-  }
+      }
  /**
   * Save struct to update buffer.
   * saveUpdate is called when transaction ends
   */
  saveStruct (y, struct) {
    let cnf = this.ys.get(y)
    if (cnf !== undefined) {
      cnf.mutualExclude(function () {
        struct._toBinary(cnf.buffer)
        cnf.len++
      })
    }
  }
-  /* overwrite */
+  Y.AbstractPersistence = AbstractPersistence
  retrieve (y, model, updates) {
    let cnf = this.ys.get(y)
    if (cnf !== undefined) {
      cnf.mutualExclude(function () {
        y.transact(function () {
          if (model != null) {
            fromBinary(y, new BinaryDecoder(new Uint8Array(model)))
          }
          if (updates != null) {
            for (let i = 0; i < updates.length; i++) {
              integrateRemoteStructs(y, new BinaryDecoder(new Uint8Array(updates[i])))
            }
          }
        })
        y.emit('persistenceReady')
      })
    }
  }
  /* overwrite */
  persist (y) {
    return toBinary(y).createBuffer()
  }
 }
--- a/src/Struct/Delete.js
+++ b/src/Struct/Delete.js
@@ -7,7 +7,7 @@ import { logID } from '../MessageHandler/messageToString.js'
 * TODO: implement getItemCleanStartNode for better performance (only one lookup)
 */
 export function deleteItemRange (y, user, clock, range) {
-  const createDelete = y.connector !== null && y.connector._forwardAppliedStructs
+  const createDelete = y.connector._forwardAppliedStructs
  let item = y.os.getItemCleanStart(new ID(user, clock))
  if (item !== null) {
    if (!item._deleted) {
@@ -70,12 +70,12 @@ export default class Delete {
      // from remote
      const id = this._targetID
      deleteItemRange(y, id.user, id.clock, this._length)
-    } else if (y.connector !== null) {
+    } else {
      // from local
      y.connector.broadcastStruct(this)
    }
    if (y.persistence !== null) {
-      y.persistence.saveStruct(y, this)
+      y.persistence.saveOperations(this)
    }
  }
  _logString () {
--- a/src/Struct/Item.js
+++ b/src/Struct/Item.js
@@ -55,16 +55,14 @@ export default class Item {
  /**
   * Copy the effect of struct
   */
-  _copy (undeleteChildren, copyPosition) {
+  _copy () {
    let struct = new this.constructor()
-    if (copyPosition) {
+    struct._origin = this._left
-      struct._origin = this._left
+    struct._left = this._left
-      struct._left = this._left
+    struct._right = this
-      struct._right = this
+    struct._right_origin = this
-      struct._right_origin = this
+    struct._parent = this._parent
-      struct._parent = this._parent
+    struct._parentSub = this._parentSub
      struct._parentSub = this._parentSub
    }
    return struct
  }
  get _lastId () {
@@ -89,22 +87,16 @@ export default class Item {
    return this._right
  }
  _delete (y, createDelete = true) {
-    if (!this._deleted) {
+    this._deleted = true
-      this._deleted = true
+    y.ds.markDeleted(this._id, this._length)
-      y.ds.markDeleted(this._id, this._length)
+    if (createDelete) {
      let del = new Delete()
      del._targetID = this._id
      del._length = this._length
-      if (createDelete) {
+      del._integrate(y, true)
        // broadcast and persists Delete
        del._integrate(y, true)
      } else if (y.persistence !== null) {
        // only persist Delete
        y.persistence.saveStruct(y, del)
      }
      transactionTypeChanged(y, this._parent, this._parentSub)
      y._transaction.deletedStructs.add(this)
    }
    transactionTypeChanged(y, this._parent, this._parentSub)
    y._transaction.deletedStructs.add(this)
  }
  /**
   * This is called right before this struct receives any children.
@@ -119,11 +111,9 @@ export default class Item {
   * - Check if this is struct deleted
   */
  _integrate (y) {
    y._transaction.newTypes.add(this)
    const parent = this._parent
    const selfID = this._id
-    const user = selfID === null ? y.userID : selfID.user
+    const userState = selfID === null ? 0 : y.ss.getState(selfID.user)
    const userState = y.ss.getState(user)
    if (selfID === null) {
      this._id = y.ss.getNextID(this._length)
    } else if (selfID.user === RootFakeUserID) {
@@ -226,11 +216,11 @@ export default class Item {
    y.os.put(this)
    transactionTypeChanged(y, parent, parentSub)
    if (this._id.user !== RootFakeUserID) {
-      if (y.connector !== null && (y.connector._forwardAppliedStructs || this._id.user === y.userID)) {
+      if (y.connector._forwardAppliedStructs || this._id.user === y.userID) {
        y.connector.broadcastStruct(this)
      }
      if (y.persistence !== null) {
-        y.persistence.saveStruct(y, this)
+        y.persistence.saveOperations(this)
      }
    }
  }
--- a/src/Struct/ItemJSON.js
+++ b/src/Struct/ItemJSON.js
@@ -6,8 +6,8 @@ export default class ItemJSON extends Item {
    super()
    this._content = null
  }
-  _copy (undeleteChildren, copyPosition) {
+  _copy () {
-    let struct = super._copy(undeleteChildren, copyPosition)
+    let struct = super._copy()
    struct._content = this._content
    return struct
  }
--- a/src/Struct/ItemString.js
+++ b/src/Struct/ItemString.js
@@ -6,8 +6,8 @@ export default class ItemString extends Item {
    super()
    this._content = null
  }
-  _copy (undeleteChildren, copyPosition) {
+  _copy () {
-    let struct = super._copy(undeleteChildren, copyPosition)
+    let struct = super._copy()
    struct._content = this._content
    return struct
  }
--- a/src/Struct/Type.js
+++ b/src/Struct/Type.js
@@ -79,16 +79,15 @@ export default class Type extends Item {
      type = type._parent
    }
  }
-  _copy (undeleteChildren, copyPosition) {
+  _copy (undeleteChildren) {
-    let copy = super._copy(undeleteChildren, copyPosition)
+    let copy = super._copy()
    let map = new Map()
    copy._map = map
    for (let [key, value] of this._map) {
      if (undeleteChildren.has(value) || !value.deleted) {
-        let _item = value._copy(undeleteChildren, false)
+        let _item = value._copy(undeleteChildren)
        _item._parent = copy
-        _item._parentSub = key
+        map.set(key, value._copy(undeleteChildren))
        map.set(key, _item)
      }
    }
    let prevUndeleted = null
@@ -96,7 +95,7 @@ export default class Type extends Item {
    let item = this._start
    while (item !== null) {
      if (undeleteChildren.has(item) || !item.deleted) {
-        let _item = item._copy(undeleteChildren, false)
+        let _item = item._copy(undeleteChildren)
        _item._left = prevUndeleted
        _item._origin = prevUndeleted
        _item._right = null
@@ -134,6 +133,7 @@ export default class Type extends Item {
    this._deepEventHandler.removeEventListener(f)
  }
  _integrate (y) {
    y._transaction.newTypes.add(this)
    super._integrate(y)
    this._y = y
    // when integrating children we must make sure to
--- a/src/Type/YArray.js
+++ b/src/Type/YArray.js
@@ -5,42 +5,15 @@ import { logID } from '../MessageHandler/messageToString.js'
 import YEvent from '../Util/YEvent.js'
 class YArrayEvent extends YEvent {
-  constructor (yarray, remote, transaction) {
+  constructor (yarray, remote) {
    super(yarray)
    this.remote = remote
    this._transaction = transaction
    this._addedElements = null
  }
  get addedElements () {
    if (this._addedElements === null) {
      const target = this.target
      const transaction = this._transaction
      const addedElements = new Set()
      transaction.newTypes.forEach(function (type) {
        if (type._parent === target && !transaction.deletedStructs.has(type)) {
          addedElements.add(type)
        }
      })
      this._addedElements = addedElements
    }
    return this._addedElements
  }
  get removedElements () {
    const target = this.target
    const transaction = this._transaction
    const removedElements = new Set()
    transaction.deletedStructs.forEach(function (struct) {
      if (struct._parent === target && !transaction.newTypes.has(struct)) {
        removedElements.add(struct)
      }
    })
    return removedElements
  }
 }
 export default class YArray extends Type {
  _callObserver (transaction, parentSubs, remote) {
-    this._callEventHandler(transaction, new YArrayEvent(this, remote, transaction))
+    this._callEventHandler(transaction, new YArrayEvent(this, remote))
  }
  get (pos) {
    let n = this._start
@@ -211,12 +184,8 @@ export default class YArray extends Type {
          prevJsonIns._content.push(c)
        }
      }
-      if (prevJsonIns !== null) {
+      if (prevJsonIns !== null && y !== null) {
-        if (y !== null) {
+        prevJsonIns._integrate(y)
          prevJsonIns._integrate(y)
        } else if (prevJsonIns._left === null) {
          this._start = prevJsonIns
        }
      }
    })
  }
@@ -245,17 +214,6 @@ export default class YArray extends Type {
    }
    this.insertAfter(left, content)
  }
  push (content) {
    let n = this._start
    let lastUndeleted = null
    while (n !== null) {
      if (!n._deleted) {
        lastUndeleted = n
      }
      n = n._right
    }
    this.insertAfter(lastUndeleted, content)
  }
  _logString () {
    const left = this._left !== null ? this._left._lastId : null
    const origin = this._origin !== null ? this._origin._lastId : null
--- a/src/Type/YMap.js
+++ b/src/Type/YMap.js
@@ -56,7 +56,7 @@ export default class YMap extends Type {
    this._transact(y => {
      const old = this._map.get(key) || null
      if (old !== null) {
-        if (old.constructor === ItemJSON && !old._deleted && old._content[0] === value) {
+        if (old instanceof ItemJSON && old._content[0] === value) {
          // Trying to overwrite with same value
          // break here
          return value
--- a/src/Type/YText.js
+++ b/src/Type/YText.js
@@ -24,9 +24,6 @@ export default class YText extends YArray {
    return strBuilder.join('')
  }
  insert (pos, text) {
    if (text.length <= 0) {
      return
    }
    this._transact(y => {
      let left = null
      let right = this._start
--- a/src/Type/y-xml/YXmlElement.js
+++ b/src/Type/y-xml/YXmlElement.js
@@ -1,3 +1,4 @@
 // import diff from 'fast-diff'
 import { defaultDomFilter } from './utils.js'
 import YMap from '../YMap.js'
@@ -20,8 +21,8 @@ export default class YXmlElement extends YXmlFragment {
      this._domFilter = arg2
    }
  }
-  _copy (undeleteChildren, copyPosition) {
+  _copy (undeleteChildren) {
-    let struct = super._copy(undeleteChildren, copyPosition)
+    let struct = super._copy(undeleteChildren)
    struct.nodeName = this.nodeName
    return struct
  }
@@ -47,11 +48,6 @@ export default class YXmlElement extends YXmlFragment {
      return dom
    }
  }
  _bindToDom (dom, _document) {
    _document = _document || document
    this._dom = dom
    dom._yxml = this
  }
  _fromBinary (y, decoder) {
    const missing = super._fromBinary(y, decoder)
    this.nodeName = decoder.readVarString()
--- a/src/Type/y-xml/YXmlFragment.js
+++ b/src/Type/y-xml/YXmlFragment.js
@@ -7,7 +7,7 @@ import YArray from '../YArray.js'
 import YXmlEvent from './YXmlEvent.js'
 import { YXmlText, YXmlHook } from './y-xml'
 import { logID } from '../../MessageHandler/messageToString.js'
-import diff from '../../Util/simpleDiff.js'
+import diff from 'fast-diff'
 function domToYXml (parent, doms, _document) {
  const types = []
@@ -55,7 +55,7 @@ class YXmlTreeWalker {
      }
    }
    do {
-      if (!n._deleted && (n.constructor === YXmlFragment._YXmlElement || n.constructor === YXmlFragment) && n._start !== null) {
+      if (!n._deleted && n.constructor === YXmlFragment._YXmlElement && n._start !== null) {
        // walk down in the tree
        n = n._start
      } else {
@@ -101,11 +101,9 @@ export default class YXmlFragment extends YArray {
        } catch (e) {
          console.error(e)
        }
        /*
        if (this._domObserver !== null) {
          this._domObserver.takeRecords()
        }
        */
        token = true
      }
    }
@@ -145,27 +143,8 @@ export default class YXmlFragment extends YArray {
  }
  setDomFilter (f) {
    this._domFilter = f
-    let attributes = new Map()
+    this.forEach(xml => {
-    if (this.getAttributes !== undefined) {
+      xml.setDomFilter(f)
      let attrs = this.getAttributes()
      for (let key in attrs) {
        attributes.set(key, attrs[key])
      }
    }
    this._y.transact(() => {
      let result = this._domFilter(this.nodeName, new Map(attributes))
      if (result === null) {
        this._delete(this._y)
      } else {
        attributes.forEach((value, key) => {
          if (!result.has(key)) {
            this.removeAttribute(key)
          }
        })
      }
      this.forEach(xml => {
        xml.setDomFilter(f)
      })
    })
  }
  _callObserver (transaction, parentSubs, remote) {
@@ -187,9 +166,6 @@ export default class YXmlFragment extends YArray {
      this._dom._yxml = null
      this._dom = null
    }
    if (this._beforeTransactionHandler !== undefined) {
      this._y.off('beforeTransaction', this._beforeTransactionHandler)
    }
  }
  insertDomElementsAfter (prev, doms, _document) {
    const types = domToYXml(this, doms, _document)
@@ -223,7 +199,9 @@ export default class YXmlFragment extends YArray {
    _document = _document || document
    this._dom = dom
    dom._yxml = this
-    if (this._parent === null) {
+    // TODO: refine this..
    if ((this.constructor !== YXmlFragment && this._parent !== this._y) || this._parent === null) {
      // TODO: only top level YXmlFragment can bind. Also allow YXmlElements..
      return
    }
    this._y.on('beforeTransaction', beforeTransactionSelectionFixer)
@@ -276,14 +254,15 @@ export default class YXmlFragment extends YArray {
    })
    // Apply Y.Xml events to dom
    this.observeDeep(events => {
-      reflectChangesOnDom.call(this, events, _document)
+      this._mutualExclude(() => {
        reflectChangesOnDom.call(this, events, _document)
      })
    })
    // Apply Dom changes on Y.Xml
    if (typeof MutationObserver !== 'undefined') {
-      this._beforeTransactionHandler = () => {
+      this._y.on('beforeTransaction', () => {
        this._domObserverListener(this._domObserver.takeRecords())
-      }
+      })
      this._y.on('beforeTransaction', this._beforeTransactionHandler)
      this._domObserverListener = mutations => {
        this._mutualExclude(() => {
          this._y.transact(() => {
@@ -297,9 +276,19 @@ export default class YXmlFragment extends YArray {
              }
              switch (mutation.type) {
                case 'characterData':
-                  var change = diff(yxml.toString(), dom.nodeValue)
+                  var diffs = diff(yxml.toString(), dom.nodeValue)
-                  yxml.delete(change.pos, change.remove)
+                  var pos = 0
-                  yxml.insert(change.pos, change.insert)
+                  for (var i = 0; i < diffs.length; i++) {
                    var d = diffs[i]
                    if (d[0] === 0) { // EQUAL
                      pos += d[1].length
                    } else if (d[0] === -1) { // DELETE
                      yxml.delete(pos, d[1].length)
                    } else { // INSERT
                      yxml.insert(pos, d[1])
                      pos += d[1].length
                    }
                  }
                  break
                case 'attributes':
                  if (yxml.constructor === YXmlFragment) {
@@ -326,9 +315,6 @@ export default class YXmlFragment extends YArray {
              }
            })
            for (let dom of diffChildren) {
              if (dom.yOnChildrenChanged !== undefined) {
                dom.yOnChildrenChanged()
              }
              if (dom._yxml != null && dom._yxml !== false) {
                applyChangesFromDom(dom)
              }
--- a/src/Type/y-xml/YXmlHook.js
+++ b/src/Type/y-xml/YXmlHook.js
@@ -14,11 +14,6 @@ export default class YXmlHook extends YMap {
      getHook(hookName).fillType(dom, this)
    }
  }
  _copy (undeleteChildren, copyPosition) {
    const struct = super._copy(undeleteChildren, copyPosition)
    struct.hookName = this.hookName
    return struct
  }
  getDom (_document) {
    _document = _document || document
    if (this._dom === null) {
@@ -29,11 +24,6 @@ export default class YXmlHook extends YMap {
    }
    return this._dom
  }
  _unbindFromDom () {
    this._dom._yxml = null
    this._yxml = null
    // TODO: cleanup hook?
  }
  _fromBinary (y, decoder) {
    const missing = super._fromBinary(y, decoder)
    this.hookName = decoder.readVarString()
--- a/src/Type/y-xml/selection.js
+++ b/src/Type/y-xml/selection.js
@@ -68,6 +68,7 @@ export function afterTransactionSelectionFixer (y, transaction, remote) {
    }
  }
  if (shouldUpdate) {
    console.info('updating selection!!')
    browserSelection.setBaseAndExtent(
      anchorNode,
      anchorOffset,
--- a/src/Type/y-xml/utils.js
+++ b/src/Type/y-xml/utils.js
@@ -174,7 +174,7 @@ export function reflectChangesOnDom (events, _document) {
        // let anchorViewPosition = getAnchorViewPosition(yxml._scrollElement)
        if (yxml.constructor === YXmlText) {
          yxml._dom.nodeValue = yxml.toString()
-        } else if (event.attributesChanged !== undefined) {
+        } else {
          // update attributes
          event.attributesChanged.forEach(attributeName => {
            const value = yxml.getAttribute(attributeName)
@@ -193,27 +193,19 @@ export function reflectChangesOnDom (events, _document) {
           *       only in the attributes (above)
           */
          if (event.childListChanged && yxml.constructor !== YXmlHook) {
-            let currentChild = dom.firstChild
+            // create fragment of undeleted nodes
            const fragment = _document.createDocumentFragment()
            yxml.forEach(function (t) {
-              let expectedChild = t.getDom(_document)
+              fragment.appendChild(t.getDom(_document))
              if (expectedChild.parentNode === dom) {
                // is already attached to the dom. Look for it
                while (currentChild !== expectedChild) {
                  let del = currentChild
                  currentChild = currentChild.nextSibling
                  dom.removeChild(del)
                }
                currentChild = currentChild.nextSibling
              } else {
                // this dom is not yet attached to dom
                dom.insertBefore(expectedChild, currentChild)
              }
            })
-            while (currentChild !== null) {
+            // remove remainding nodes
-              let tmp = currentChild.nextSibling
+            let lastChild = dom.lastChild
-              dom.removeChild(currentChild)
+            while (lastChild !== null) {
-              currentChild = tmp
+              dom.removeChild(lastChild)
              lastChild = dom.lastChild
            }
            // insert fragment of undeleted nodes
            dom.appendChild(fragment)
          }
        }
        /* TODO: smartscrolling
--- a/src/Util/ID.js
+++ b/src/Util/ID.js
@@ -11,10 +11,6 @@ export default class ID {
    return id !== null && id.user === this.user && id.clock === this.clock
  }
  lessThan (id) {
-    if (id.constructor === ID) {
+    return this.user < id.user || (this.user === id.user && this.clock < id.clock)
      return this.user < id.user || (this.user === id.user && this.clock < id.clock)
    } else {
      return false
    }
  }
 }
--- a/src/Util/NamedEventHandler.js
+++ b/src/Util/NamedEventHandler.js
@@ -1,7 +1,6 @@
 export default class NamedEventHandler {
  constructor () {
    this._eventListener = new Map()
    this._stateListener = new Map()
  }
  _getListener (name) {
    let listeners = this._eventListener.get(name)
@@ -22,32 +21,16 @@ export default class NamedEventHandler {
    let listeners = this._getListener(name)
    listeners.on.add(f)
  }
  _initStateListener (name) {
    let state = this._stateListener.get(name)
    if (state === undefined) {
      state = {}
      state.promise = new Promise(function (resolve) {
        state.resolve = resolve
      })
      this._stateListener.set(name, state)
    }
    return state
  }
  when (name) {
    return this._initStateListener(name).promise
  }
  off (name, f) {
    if (name == null || f == null) {
      throw new Error('You must specify event name and function!')
    }
    const listener = this._eventListener.get(name)
    if (listener !== undefined) {
-      listener.on.delete(f)
+      listener.remove(f)
      listener.once.delete(f)
    }
  }
  emit (name, ...args) {
    this._initStateListener(name).resolve()
    const listener = this._eventListener.get(name)
    if (listener !== undefined) {
      listener.on.forEach(f => f.apply(null, args))
--- a/src/Util/RootID.js
+++ b/src/Util/RootID.js
@@ -12,10 +12,6 @@ export default class RootID {
    return id !== null && id.user === this.user && id.name === this.name && id.type === this.type
  }
  lessThan (id) {
-    if (id.constructor === RootID) {
+    return this.user < id.user || (this.user === id.user && (this.name < id.name || (this.name === id.name && this.type < id.type)))
      return this.user < id.user || (this.user === id.user && (this.name < id.name || (this.name === id.name && this.type < id.type)))
    } else {
      return true
    }
  }
 }
--- a/src/Util/UndoManager.js
+++ b/src/Util/UndoManager.js
@@ -50,7 +50,7 @@ function applyReverseOperation (y, scope, reverseBuffer) {
          )
        ) {
          performedUndo = true
-          op = op._copy(undoOp.deletedStructs, true)
+          op = op._copy(undoOp.deletedStructs)
          op._integrate(y)
        }
      }
--- a/src/Util/mutualExclude.js
+++ b/src/Util/mutualExclude.js
@@ -1,15 +0,0 @@
 export function createMutualExclude () {
  var token = true
  return function mutualExclude (f) {
    if (token) {
      token = false
      try {
        f()
      } catch (e) {
        console.error(e)
      }
      token = true
    }
  }
 }
--- a/src/Util/relativePosition.js
+++ b/src/Util/relativePosition.js
@@ -2,31 +2,37 @@ import ID from './ID.js'
 import RootID from './RootID.js'
 export function getRelativePosition (type, offset) {
-  let t = type._start
+  if (offset === 0) {
-  while (t !== null) {
+    return ['startof', type._id.user, type._id.clock || null, type._id.name || null, type._id.type || null]
-    if (t._deleted === false) {
+  } else {
-      if (t._length > offset) {
+    let t = type._start
-        return [t._id.user, t._id.clock + offset]
+    while (t !== null) {
      if (t._deleted === false) {
        if (t._length >= offset) {
          return [t._id.user, t._id.clock + offset - 1]
        }
        if (t._right === null) {
          return [t._id.user, t._id.clock + t._length - 1]
        }
        offset -= t._length
      }
-      offset -= t._length
+      t = t._right
    }
-    t = t._right
+    return null
  }
  return ['endof', type._id.user, type._id.clock || null, type._id.name || null, type._id.type || null]
 }
 export function fromRelativePosition (y, rpos) {
-  if (rpos[0] === 'endof') {
+  if (rpos[0] === 'startof') {
    let id
    if (rpos[3] === null) {
      id = new ID(rpos[1], rpos[2])
    } else {
      id = new RootID(rpos[3], rpos[4])
    }
    const type = y.os.get(id)
    return {
-      type,
+      type: y.os.get(id),
-      offset: type.length
+      offset: 0
    }
  } else {
    let offset = 0
@@ -36,7 +42,7 @@ export function fromRelativePosition (y, rpos) {
      return null
    }
    if (!struct._deleted) {
-      offset = rpos[1] - struct._id.clock
+      offset = rpos[1] - struct._id.clock + 1
    }
    struct = struct._left
    while (struct !== null) {
--- a/src/Util/simpleDiff.js
+++ b/src/Util/simpleDiff.js
@@ -1,19 +0,0 @@
 export default function simpleDiff (a, b) {
  let left = 0 // number of same characters counting from left
  let right = 0 // number of same characters counting from right
  while (left < a.length && left < b.length && a[left] === b[left]) {
    left++
  }
  if (left !== a.length || left !== b.length) {
    // Only check right if a !== b
    while (right + left < a.length && right + left < b.length && a[a.length - right - 1] === b[b.length - right - 1]) {
      right++
    }
  }
  return {
    pos: left,
    remove: a.length - left - right,
    insert: b.slice(left, b.length - right)
  }
 }
--- a/src/Y.js
+++ b/src/Y.js
@@ -5,7 +5,6 @@ import { generateUserID } from './Util/generateUserID.js'
 import RootID from './Util/RootID.js'
 import NamedEventHandler from './Util/NamedEventHandler.js'
 import UndoManager from './Util/UndoManager.js'
 import { integrateRemoteStructs } from './MessageHandler/integrateRemoteStructs.js'
 import { messageToString, messageToRoomname } from './MessageHandler/messageToString.js'
@@ -22,58 +21,26 @@ import { addStruct as addType } from './Util/structReferences.js'
 import debug from 'debug'
 import Transaction from './Transaction.js'
 import TextareaBinding from './Binding/TextareaBinding.js'
 import { toBinary, fromBinary } from './MessageHandler/binaryEncode.js'
 export default class Y extends NamedEventHandler {
-  constructor (room, opts, persistence) {
+  constructor (opts) {
    super()
    this.room = room
    if (opts != null) {
      opts.connector.room = room
    }
    this._contentReady = false
    this._opts = opts
-    this.userID = generateUserID()
+    this.userID = opts._userID != null ? opts._userID : generateUserID()
    this.share = {}
    this.ds = new DeleteStore(this)
    this.os = new OperationStore(this)
    this.ss = new StateStore(this)
    this.connector = new Y[opts.connector.name](this, opts.connector)
    if (opts.persistence != null) {
      this.persistence = new Y[opts.persistence.name](this, opts.persistence)
      this.persistence.retrieveContent()
    } else {
      this.persistence = null
    }
    this.connected = true
    this._missingStructs = new Map()
    this._readyToIntegrate = []
    this._transaction = null
    this.connector = null
    this.connected = false
    let initConnection = () => {
      if (opts != null) {
        this.connector = new Y[opts.connector.name](this, opts.connector)
        this.connected = true
        this.emit('connectorReady')
      }
    }
    if (persistence != null) {
      this.persistence = persistence
      persistence._init(this).then(initConnection)
    } else {
      this.persistence = null
      initConnection()
    }
  }
  _setContentReady () {
    if (!this._contentReady) {
      this._contentReady = true
      this.emit('content')
    }
  }
  whenContentReady () {
    if (this._contentReady) {
      return Promise.resolve()
    } else {
      return new Promise(resolve => {
        this.once('content', resolve)
      })
    }
  }
  _beforeChange () {}
  transact (f, remote = false) {
@@ -123,6 +90,9 @@ export default class Y extends NamedEventHandler {
  set _start (start) {
    return null
  }
  get room () {
    return this._opts.connector.room
  }
  define (name, TypeConstructor) {
    let id = new RootID(name, TypeConstructor)
    let type = this.os.get(id)
@@ -153,18 +123,11 @@ export default class Y extends NamedEventHandler {
    }
  }
  destroy () {
    super.destroy()
    this.share = null
-    if (this.connector != null) {
+    if (this.connector.destroy != null) {
-      if (this.connector.destroy != null) {
+      this.connector.destroy()
-        this.connector.destroy()
+    } else {
-      } else {
+      this.connector.disconnect()
        this.connector.disconnect()
      }
    }
    if (this.persistence !== null) {
      this.persistence.deinit(this)
      this.persistence = null
    }
    this.os = null
    this.ds = null
@@ -192,7 +155,7 @@ Y.extend = function extendYjs () {
 // TODO: The following assignments should be moved to yjs-dist
 Y.AbstractConnector = Connector
-Y.AbstractPersistence = Persistence
+Y.Persisence = Persistence
 Y.Array = YArray
 Y.Map = YMap
 Y.Text = YText
@@ -201,17 +164,12 @@ Y.XmlFragment = YXmlFragment
 Y.XmlText = YXmlText
 Y.XmlHook = YXmlHook
 Y.TextareaBinding = TextareaBinding
 Y.utils = {
  BinaryDecoder,
  UndoManager,
  getRelativePosition,
  fromRelativePosition,
-  addType,
+  addType
  integrateRemoteStructs,
  toBinary,
  fromBinary
 }
 Y.debug = debug
--- a/test/diff.tests.js
+++ b/test/diff.tests.js
@@ -1,29 +0,0 @@
 import { test } from '../node_modules/cutest/cutest.mjs'
 import simpleDiff from '../src/Util/simpleDiff.js'
 import Chance from 'chance'
 function runDiffTest (t, a, b, expected) {
  let result = simpleDiff(a, b)
  t.compare(result, expected, `Compare "${a}" with "${b}"`)
 }
 test('diff tests', async function diff1 (t) {
  runDiffTest(t, 'abc', 'axc', { pos: 1, remove: 1, insert: 'x' })
  runDiffTest(t, 'bc', 'xc', { pos: 0, remove: 1, insert: 'x' })
  runDiffTest(t, 'ab', 'ax', { pos: 1, remove: 1, insert: 'x' })
  runDiffTest(t, 'b', 'x', { pos: 0, remove: 1, insert: 'x' })
  runDiffTest(t, '', 'abc', { pos: 0, remove: 0, insert: 'abc' })
  runDiffTest(t, 'abc', 'xyz', { pos: 0, remove: 3, insert: 'xyz' })
  runDiffTest(t, 'axz', 'au', { pos: 1, remove: 2, insert: 'u' })
  runDiffTest(t, 'ax', 'axy', { pos: 2, remove: 0, insert: 'y' })
 })
 test('random diff tests', async function randomDiff (t) {
  const chance = new Chance(t.getSeed() * 1000000000)
  let a = chance.word()
  let b = chance.word()
  let change = simpleDiff(a, b)
  let arr = Array.from(a)
  arr.splice(change.pos, change.remove, ...Array.from(change.insert))
  t.assert(arr.join('') === b, 'Applying change information is correct')
 })
--- a/test/encode-decode.tests.js
+++ b/test/encode-decode.tests.js
@@ -54,9 +54,6 @@ test('varString', async function varString (t) {
  testEncoding(t, writeVarString, readVarString, 'test!')
  testEncoding(t, writeVarString, readVarString, '☺☺☺')
  testEncoding(t, writeVarString, readVarString, '1234')
  testEncoding(t, writeVarString, readVarString, '쾟')
  testEncoding(t, writeVarString, readVarString, '龟') // surrogate length 3
  testEncoding(t, writeVarString, readVarString, '😝') // surrogate length 4
 })
 test('varString random', async function varStringRandom (t) {
--- a/test/index.html
+++ b/test/index.html
@@ -3,6 +3,6 @@
  <head>
  </head>
  <body>
-    <script type="module" src="./index.js"></script>
+    <script type="module" src="./encode-decode.js"></script>
  </body>
 </html>
--- a/test/index.js
+++ b/test/index.js
@@ -1,6 +0,0 @@
 import './red-black-tree.js'
 import './y-array.tests.js'
 import './y-map.tests.js'
 import './y-xml.tests.js'
 import './encode-decode.tests.js'
 import './diff.tests.js'
--- a/test/y-xml.tests.js
+++ b/test/y-xml.tests.js
@@ -280,6 +280,7 @@ test('deep element insert', async function xml16 (t) {
  deepElement.append(boldElement)
  deepElement.append(attrElement)
  dom0.append(deepElement)
  console.log(dom0.outerHTML)
  let str0 = dom0.outerHTML
  await flushAll(t, users)
  let str1 = dom1.outerHTML
@@ -339,6 +340,7 @@ test('Filtering remote changes', async function xmlFilteringRemote (t) {
  // check dom
  paragraph.getDom().setAttribute('malicious', 'true')
  span.getDom().setAttribute('malicious', 'true')
  console.log(xml0.toString())
  // check incoming attributes
  xml1.get(0).get(0).setAttribute('malicious', 'true')
  xml1.insert(0, [new Y.XmlElement('hideMe')])
--- a/tests-lib/helper.js
+++ b/tests-lib/helper.js
@@ -145,7 +145,7 @@ export async function initArrays (t, opts) {
    } else {
      connOpts = Object.assign({ role: 'slave' }, conn)
    }
-    let y = new Y(connOpts.room, {
+    let y = new Y({
      _userID: i, // evil hackery, don't try this at home
      connector: connOpts
    })
--- a/y.js
+++ b/y.js
--- a/y.js.map
+++ b/y.js.map
--- a/y.node.js
+++ b/y.node.js
--- a/y.node.js.map
+++ b/y.node.js.map
--- a/y.test.js
+++ b/y.test.js
@@ -1,8 +1,8 @@
 (function (global, factory) {
-	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
-	typeof define === 'function' && define.amd ? define(factory) :
+	typeof define === 'function' && define.amd ? define(['exports'], factory) :
-	(factory());
+	(factory((global['y-tests'] = {})));
-}(this, (function () { 'use strict';
+}(this, (function (exports) { 'use strict';
 class N {
  // A created node is always red!
@@ -2201,38 +2201,15 @@ class YEvent {
 }
 class YArrayEvent extends YEvent {
-  constructor (yarray, remote, transaction) {
+  constructor (yarray, remote) {
    super(yarray);
    this.remote = remote;
    this._transaction = transaction;
  }
  get addedElements () {
    const target = this.target;
    const transaction = this._transaction;
    const addedElements = new Set();
    transaction.newTypes.forEach(function (type) {
      if (type._parent === target && !transaction.deletedStructs.has(type)) {
        addedElements.add(type);
      }
    });
    return addedElements
  }
  get removedElements () {
    const target = this.target;
    const transaction = this._transaction;
    const removedElements = new Set();
    transaction.deletedStructs.forEach(function (struct) {
      if (struct._parent === target && !transaction.newTypes.has(struct)) {
        removedElements.add(struct);
      }
    });
    return removedElements
  }
 }
 class YArray extends Type {
  _callObserver (transaction, parentSubs, remote) {
-    this._callEventHandler(transaction, new YArrayEvent(this, remote, transaction));
+    this._callEventHandler(transaction, new YArrayEvent(this, remote));
  }
  get (pos) {
    let n = this._start;
@@ -2403,12 +2380,8 @@ class YArray extends Type {
          prevJsonIns._content.push(c);
        }
      }
-      if (prevJsonIns !== null) {
+      if (prevJsonIns !== null && y !== null) {
-        if (y !== null) {
+        prevJsonIns._integrate(y);
          prevJsonIns._integrate(y);
        } else if (prevJsonIns._left === null) {
          this._start = prevJsonIns;
        }
      }
    });
  }
@@ -2437,17 +2410,6 @@ class YArray extends Type {
    }
    this.insertAfter(left, content);
  }
  push (content) {
    let n = this._start;
    let lastUndeleted = null;
    while (n !== null) {
      if (!n._deleted) {
        lastUndeleted = n;
      }
      n = n._right;
    }
    this.insertAfter(lastUndeleted, content);
  }
  _logString () {
    const left = this._left !== null ? this._left._lastId : null;
    const origin = this._origin !== null ? this._origin._lastId : null;
@@ -2591,17 +2553,14 @@ class YText extends YArray {
      let right = this._start;
      let count = 0;
      while (right !== null) {
-        const rightLen = right._deleted ? 0 : (right._length - 1);
+        if (count <= pos && pos < count + right._length) {
        if (count <= pos && pos <= count + rightLen) {
          const splitDiff = pos - count;
-          right = right._splitAt(this._y, splitDiff);
+          right = right._splitAt(this._y, pos - count);
          left = right._left;
          count += splitDiff;
          break
        }
-        if (!right._deleted) {
+        count += right._length;
          count += right._length;
        }
        left = right;
        right = right._right;
      }
@@ -2761,7 +2720,7 @@ function reflectChangesOnDom (events, _document) {
        // let anchorViewPosition = getAnchorViewPosition(yxml._scrollElement)
        if (yxml.constructor === YXmlText) {
          yxml._dom.nodeValue = yxml.toString();
-        } else if (event.attributesChanged !== undefined) {
+        } else {
          // update attributes
          event.attributesChanged.forEach(attributeName => {
            const value = yxml.getAttribute(attributeName);
@@ -2780,27 +2739,19 @@ function reflectChangesOnDom (events, _document) {
           *       only in the attributes (above)
           */
          if (event.childListChanged && yxml.constructor !== YXmlHook) {
-            let currentChild = dom.firstChild;
+            // create fragment of undeleted nodes
            const fragment = _document.createDocumentFragment();
            yxml.forEach(function (t) {
-              let expectedChild = t.getDom(_document);
+              fragment.appendChild(t.getDom(_document));
              if (expectedChild.parentNode === dom) {
                // is already attached to the dom. Look for it
                while (currentChild !== expectedChild) {
                  let del = currentChild;
                  currentChild = currentChild.nextSibling;
                  dom.removeChild(del);
                }
                currentChild = currentChild.nextSibling;
              } else {
                // this dom is not yet attached to dom
                dom.insertBefore(expectedChild, currentChild);
              }
            });
-            while (currentChild !== null) {
+            // remove remainding nodes
-              let tmp = currentChild.nextSibling;
+            let lastChild = dom.lastChild;
-              dom.removeChild(currentChild);
+            while (lastChild !== null) {
-              currentChild = tmp;
+              dom.removeChild(lastChild);
              lastChild = dom.lastChild;
            }
            // insert fragment of undeleted nodes
            dom.appendChild(fragment);
          }
        }
        /* TODO: smartscrolling
@@ -2982,6 +2933,7 @@ function afterTransactionSelectionFixer (y, transaction, remote) {
    }
  }
  if (shouldUpdate) {
    console.info('updating selection!!');
    browserSelection.setBaseAndExtent(
      anchorNode,
      anchorOffset,
@@ -2989,6 +2941,9 @@ function afterTransactionSelectionFixer (y, transaction, remote) {
      focusOffset
    );
  }
  // delete, so the objects can be gc'd
  relativeSelection = null;
  browserSelection = null;
 }
 class YXmlEvent extends YEvent {
@@ -3756,7 +3711,7 @@ function domToYXml (parent, doms, _document) {
    }
    if (parent._domFilter(d.nodeName, new Map()) !== null) {
      let type;
-      const hookName = d._yjsHook || (d.dataset != null ? d.dataset.yjsHook : undefined);
+      const hookName = d._yjsHook;
      if (hookName !== undefined) {
        type = new YXmlHook(hookName, d);
      } else if (d.nodeType === d.TEXT_NODE) {
@@ -3794,7 +3749,7 @@ class YXmlTreeWalker {
      }
    }
    do {
-      if (!n._deleted && (n.constructor === YXmlFragment._YXmlElement || n.constructor === YXmlFragment) && n._start !== null) {
+      if (!n._deleted && n.constructor === YXmlFragment._YXmlElement && n._start !== null) {
        // walk down in the tree
        n = n._start;
      } else {
@@ -3882,23 +3837,6 @@ class YXmlFragment extends YArray {
  }
  setDomFilter (f) {
    this._domFilter = f;
    let attributes = new Map();
    if (this.getAttributes !== undefined) {
      let attrs = this.getAttributes();
      for (let key in attrs) {
        attributes.set(key, attrs[key]);
      }
    }
    let result = this._domFilter(this.nodeName, new Map(attributes));
    if (result === null) {
      this._delete(this._y);
    } else {
      attributes.forEach((value, key) => {
        if (!result.has(key)) {
          this.removeAttribute(key);
        }
      });
    }
    this.forEach(xml => {
      xml.setDomFilter(f);
    });
@@ -4024,7 +3962,7 @@ class YXmlFragment extends YArray {
            mutations.forEach(mutation => {
              const dom = mutation.target;
              const yxml = dom._yxml;
-              if (yxml == null || yxml.constructor === YXmlHook) {
+              if (yxml == null) {
                // dom element is filtered
                return
              }
@@ -4240,7 +4178,6 @@ class YXmlHook extends YMap {
    if (hookName !== undefined) {
      this.hookName = hookName;
      this._dom = dom;
      dom._yjsHook = hookName;
      dom._yxml = this;
      getHook(hookName).fillType(dom, this);
    }
@@ -4251,15 +4188,9 @@ class YXmlHook extends YMap {
      const dom = getHook(this.hookName).createDom(this);
      this._dom = dom;
      dom._yxml = this;
      dom._yjsHook = this.hookName;
    }
    return this._dom
  }
  _unbindFromDom () {
    this._dom._yxml = null;
    this._yxml = null;
    // TODO: cleanup hook?
  }
  _fromBinary (y, decoder) {
    const missing = super._fromBinary(y, decoder);
    this.hookName = decoder.readVarString();
@@ -4275,12 +4206,6 @@ class YXmlHook extends YMap {
    }
    super._integrate(y);
  }
  setDomFilter () {
    // TODO: implement new modfilter method!
  }
  enableSmartScrolling () {
    // TODO: implement new smartscrolling method!
  }
 }
 YXmlHook.addHook = addHook;
@@ -4743,7 +4668,7 @@ var y = d * 365.25;
 * @api public
 */
-var index = function(val, options) {
+var ms = function(val, options) {
  options = options || {};
  var type = typeof val;
  if (type === 'string' && val.length > 0) {
@@ -4885,7 +4810,7 @@ exports.coerce = coerce;
 exports.disable = disable;
 exports.enable = enable;
 exports.enabled = enabled;
-exports.humanize = index;
+exports.humanize = ms;
 /**
 * The currently active debug mode names, and names to skip.
@@ -4944,8 +4869,8 @@ function createDebug(namespace) {
    // set `diff` timestamp
    var curr = +new Date();
-    var ms = curr - (prevTime || curr);
+    var ms$$1 = curr - (prevTime || curr);
-    self.diff = ms;
+    self.diff = ms$$1;
    self.prev = prevTime;
    self.curr = curr;
    prevTime = curr;
@@ -4964,19 +4889,19 @@ function createDebug(namespace) {
    }
    // apply any `formatters` transformations
-    var index$$1 = 0;
+    var index = 0;
    args[0] = args[0].replace(/%([a-zA-Z%])/g, function(match, format) {
      // if we encounter an escaped % then don't increase the array index
      if (match === '%%') return match;
-      index$$1++;
+      index++;
      var formatter = exports.formatters[format];
      if ('function' === typeof formatter) {
-        var val = args[index$$1];
+        var val = args[index];
        match = formatter.call(self, val);
        // now we need to remove `args[index]` since it's inlined in the `format`
-        args.splice(index$$1, 1);
+        args.splice(index, 1);
-        index$$1--;
+        index--;
      }
      return match;
    });
@@ -5939,7 +5864,7 @@ if (typeof Y !== 'undefined') {
 }
 var chance_1 = createCommonjsModule(function (module, exports) {
-//  Chance.js 1.0.10
+//  Chance.js 1.0.12
 //  http://chancejs.com
 //  (c) 2013 Victor Quinn
 //  Chance may be freely distributed or modified under the MIT license.
@@ -6004,7 +5929,7 @@ var chance_1 = createCommonjsModule(function (module, exports) {
        return this;
    }
-    Chance.prototype.VERSION = "1.0.10";
+    Chance.prototype.VERSION = "1.0.12";
    // Random helper functions
    function initOptions(options, defaults) {
@@ -6223,6 +6148,16 @@ var chance_1 = createCommonjsModule(function (module, exports) {
 		return integer.toString(16);
    };
    Chance.prototype.letter = function(options) {
        options = initOptions(options, {casing: 'lower'});
        var pool = "abcdefghijklmnopqrstuvwxyz";
        var letter = this.character({pool: pool});
        if (options.casing === 'upper') {
            letter = letter.toUpperCase();
        }
        return letter;
    };
    /**
     *  Return a random string
     *
@@ -7165,8 +7100,25 @@ var chance_1 = createCommonjsModule(function (module, exports) {
        return this.word({length: options.length}) + '@' + (options.domain || this.domain());
    };
    /**
     * #Description:
     * ===============================================
     * Generate a random Facebook id, aka fbid.
     *
     * NOTE: At the moment (Sep 2017), Facebook ids are
     * "numeric strings" of length 16.
     * However, Facebook Graph API documentation states that
     * "it is extremely likely to change over time".
     * @see https://developers.facebook.com/docs/graph-api/overview/
     *
     * #Examples:
     * ===============================================
     * chance.fbid() => '1000035231661304'
     *
     * @return [string] facebook id
     */
    Chance.prototype.fbid = function () {
-        return parseInt('10000' + this.natural({max: 100000000000}), 10);
+        return '10000' + this.string({pool: "1234567890", length: 11});
    };
    Chance.prototype.google_analytics = function () {
@@ -8007,8 +7959,72 @@ var chance_1 = createCommonjsModule(function (module, exports) {
    // -- End Regional
    // -- Music --
    Chance.prototype.note = function(options) {
      // choices for 'notes' option:
      // flatKey - chromatic scale with flat notes (default)
      // sharpKey - chromatic scale with sharp notes
      // flats - just flat notes
      // sharps - just sharp notes
      // naturals - just natural notes
      // all - naturals, sharps and flats
      options = initOptions(options, { notes : 'flatKey'});
      var scales = {
        naturals: ['C', 'D', 'E', 'F', 'G', 'A', 'B'],
        flats: ['D♭', 'E♭', 'G♭', 'A♭', 'B♭'],
        sharps: ['C♯', 'D♯', 'F♯', 'G♯', 'A♯']
      };
      scales.all = scales.naturals.concat(scales.flats.concat(scales.sharps));
      scales.flatKey = scales.naturals.concat(scales.flats);
      scales.sharpKey = scales.naturals.concat(scales.sharps);
      return this.pickone(scales[options.notes]);
    };
    Chance.prototype.midi_note = function(options) {
      var min = 0;
      var max = 127;
      options = initOptions(options, { min : min, max : max });
      return this.integer({min: options.min, max: options.max});
    };
    Chance.prototype.chord_quality = function(options) {
      options = initOptions(options, { jazz: true });
      var chord_qualities = ['maj', 'min', 'aug', 'dim'];
      if (options.jazz){
        chord_qualities = [
          'maj7',
          'min7',
          '7',
          'sus',
          'dim',
          'ø'
        ];
      }
      return this.pickone(chord_qualities);
    };
    Chance.prototype.chord = function (options) {
      options = initOptions(options);
      return this.note(options) + this.chord_quality(options);
    };
    Chance.prototype.tempo = function (options) {
      var min = 40;
      var max = 320;
      options = initOptions(options, {min: min, max: max});
      return this.integer({min: options.min, max: options.max});
    };
    // -- End Music
    // -- Miscellaneous --
    // Coin - Flip, flip, flipadelphia
    Chance.prototype.coin = function(options) {
      return this.bool() ? "heads" : "tails";
    };
    // Dice - For all the board game geeks out there, myself included ;)
    function diceFn (range) {
        return function () {
@@ -13489,7 +13505,7 @@ async function applyRandomTests (t, mods, iterations) {
  return initInformation
 }
-var index$1$1 = function (str) {
+var index$1 = function (str) {
 	return encodeURIComponent(str).replace(/[!'()*]/g, function (c) {
 		return '%' + c.charCodeAt(0).toString(16).toUpperCase();
 	});
@@ -13675,7 +13691,7 @@ function parserForArrayFormat(opts) {
 function encode(value, opts) {
 	if (opts.encode) {
-		return opts.strict ? index$1$1(value) : encodeURIComponent(value);
+		return opts.strict ? index$1(value) : encodeURIComponent(value);
 	}
 	return value;
@@ -13787,7 +13803,7 @@ var stringify = function (obj, opts) {
 	}).join('&') : '';
 };
-var index$2 = {
+var index = {
 	extract: extract,
 	parse: parse$1,
 	stringify: stringify
@@ -13802,7 +13818,7 @@ const browserSupport =
 function createTestLink (params) {
  if (typeof location !== 'undefined') {
-    var query = index$2.parse(location.search);
+    var query = index.parse(location.search);
    delete query.test;
    delete query.seed;
    delete query.args;
@@ -13812,7 +13828,7 @@ function createTestLink (params) {
        query[name] = params[name];
      }
    }
-    return location.protocol + '//' + location.host + location.pathname + '?' + index$2.stringify(query) + location.hash
+    return location.protocol + '//' + location.host + location.pathname + '?' + index.stringify(query) + location.hash
  }
 }
@@ -13823,7 +13839,7 @@ class TestHandler {
    this.repeatingRun = 0;
    this.tests = {};
    if (typeof location !== 'undefined') {
-      this.opts = index$2.parse(location.search);
+      this.opts = index.parse(location.search);
      if (this.opts.case != null) {
        this.opts.case = Number(this.opts.case);
      }
@@ -13964,7 +13980,7 @@ function createCommonjsModule$1(fn, module) {
 	return module = { exports: {} }, fn(module, module.exports), module.exports;
 }
-var isBrowser = typeof index$2 !== 'undefined';
+var isBrowser = typeof index !== 'undefined';
 var environment = {
 	isBrowser: isBrowser
@@ -18513,8 +18529,8 @@ var stacktraceGps = createCommonjsModule$1(function (module, exports) {
     * @returns {String} original representation of the base64-encoded string.
     */
    function _atob(b64str) {
-        if (typeof index$2 !== 'undefined' && index$2.atob) {
+        if (typeof index !== 'undefined' && index.atob) {
-            return index$2.atob(b64str);
+            return index.atob(b64str);
        } else {
            throw new Error('You must supply a polyfill for window.atob in this environment');
        }
@@ -19024,7 +19040,7 @@ var stacktrace = createCommonjsModule$1(function (module, exports) {
 }));
 });
-index$2.stacktrace = stacktrace;
+index.stacktrace = stacktrace;
 function test (testDescription, ...args) {
  let location = stacktrace.getSync()[1];
@@ -19312,6 +19328,7 @@ test('deep element insert', async function xml16 (t) {
  deepElement.append(boldElement);
  deepElement.append(attrElement);
  dom0.append(deepElement);
  console.log(dom0.outerHTML);
  let str0 = dom0.outerHTML;
  await flushAll(t, users);
  let str1 = dom1.outerHTML;
@@ -19371,6 +19388,7 @@ test('Filtering remote changes', async function xmlFilteringRemote (t) {
  // check dom
  paragraph.getDom().setAttribute('malicious', 'true');
  span.getDom().setAttribute('malicious', 'true');
  console.log(xml0.toString());
  // check incoming attributes
  xml1.get(0).get(0).setAttribute('malicious', 'true');
  xml1.insert(0, [new Y$1.XmlElement('hideMe')]);
@@ -19481,5 +19499,7 @@ test('y-xml: Random tests (1000)', async function xmlRandom1000 (t) {
  await applyRandomTests(t, xmlTransactions, 1000);
 });
 Object.defineProperty(exports, '__esModule', { value: true });
 })));
 //# sourceMappingURL=y.test.js.map
--- a/y.test.js.map
+++ b/y.test.js.map