v13.0.0-3 -- distribution files

13.0.0-3
change to correct main file
2017-07-06 03:29:38 +02:00 · 2017-07-06 03:29:09 +02:00 · 2017-07-06 03:28:06 +02:00 · 2017-07-05 18:41:26 +02:00 · 2017-07-05 18:40:41 +02:00 · 2017-07-05 18:33:16 +02:00
48 changed files with 6047 additions and 997 deletions
--- a/.babelrc
+++ b/.babelrc
@@ -0,0 +1,12 @@
+{
+  "presets": [
+    ["latest", {
+      "es2015": {
+        "modules": false
+      }
+    }]
+  ],
+  "plugins": [
+    "external-helpers"
+  ]
+}
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +0,0 @@
-[submodule "dist"]
-	path = dist
-	url = https://github.com/y-js/yjs.git
-	branch = dist
--- a/declarations/Structs.js
+++ b/declarations/Structs.js
@@ -1,72 +0,0 @@
-/* @flow */
-
-type UserId = string
-type Id = [UserId, number|string]
-
-/*
-type Struct = {
-  id: Id,
-  left?: Id,
-  right?: Id,
-  target?: Id,
-  struct: 'Insert' | 'Delete'
-}*/
-
-type Struct = Insertion | Deletion
-type Operation = Struct
-
-type Insertion = {
-  id: Id,
-  left: ?Id,
-  origin: ?Id,
-  right: ?Id,
-  parent: Id,
-  parentSub: ?Id,
-  opContent: ?Id,
-  content: ?any,
-  struct: 'Insert'
-}
-
-type Deletion = {
-  target: Id,
-  struct: 'Delete'
-}
-
-type MapStruct = {
-  id: Id,
-  type: TypeNames,
-  map: any
-}
-
-type ListStruct = {
-  id: Id,
-  type: TypeNames,
-  start: Id,
-  end: Id
-}
-
-
-type MessageSyncStep1 = {
-  type: 'sync step 1',
-  deleteSet: any,
-  stateSet: any
-}
-
-type MessageSyncStep2 = {
-  type: 'sync step 2',
-  os: Array<Operation>,
-  deleteSet: any,
-  stateSet: any
-}
-
-type MessageUpdate = {
-  type: 'update',
-  ops: Array<Operation>
-}
-
-type MessageSyncDone = {
-  type: 'sync done'
-}
-
-type Message = MessageSyncStep1 | MessageSyncStep2 | MessageUpdate | MessageSyncDone
-
--- a/declarations/Type.js
+++ b/declarations/Type.js
--- a/declarations/Y.js
+++ b/declarations/Y.js
@@ -1,34 +0,0 @@
-/* @flow */
-
-type YGlobal = {
-	utils: Object,
-	Struct: any,
-	AbstractDatabase: any,
-	AbstractConnector: any,
-	Transaction: any
-}
-
-type YConfig = {
-	db: Object,
-	connector: Object,
-	root: Object
-}
-
-type TypeName = 'array' | 'map' | 'text'
-
-declare var YConcurrency_TestingMode : boolean
-
-type Transaction<A> = Generator<any, A, any>
-
-type SyncRole = 'master' | 'slave'
-
-declare class Store {
-	find: (id:Id) => Transaction<any>;
-	put: (n:any) => Transaction<void>;
-	delete: (id:Id) => Transaction<void>;
-	findWithLowerBound: (start:Id) => Transaction<any>;
-	findWithUpperBound: (end:Id) => Transaction<any>;
-	findNext: (id:Id) => Transaction<any>;
-	findPrev: (id:Id) => Transaction<any>;
-	iterate: (t:any,start:?Id,end:?Id,gen:any) => Transaction<any>;
-}
--- a/1
+++ b/1
--- a/examples/ace/index.html
+++ b/examples/ace/index.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <style type="text/css" media="screen">
+    #aceContainer {
+        position: absolute;
+        top: 0;
+        right: 0;
+        bottom: 0;
+        left: 0;
+    }
+    .inserted {
+      position:absolute;
+      z-index:20;
+      background-color: #FFC107;
+    }
+    .deleted {
+      position:absolute;
+      z-index:20;
+      background-color: #FFC107;
+    }
+    </style>
+  </head>
+  <body>
+
+    <div id="aceContainer"></div>
+    <script src="../bower_components/yjs/y.js"></script>
+    <script src="../bower_components/ace-builds/src/ace.js"></script>
+
+    <script src="./index.js"></script>
+  </body>
+</html>
--- a/examples/ace/index.js
+++ b/examples/ace/index.js
@@ -0,0 +1,24 @@
+/* global Y, ace */
+
+Y({
+  db: {
+    name: 'memory'
+  },
+  connector: {
+    name: 'websockets-client',
+    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)
+})
--- a/examples/bower.json
+++ b/examples/bower.json
@@ -0,0 +1,29 @@
+{
+  "name": "yjs-examples",
+  "version": "0.0.0",
+  "homepage": "y-js.org",
+  "authors": [
+    "Kevin Jahns <kevin.jahns@rwth-aachen.de>"
+  ],
+  "description": "Examples for Yjs",
+  "license": "MIT",
+  "ignore": [],
+  "dependencies": {
+    "yjs": "latest",
+    "y-array": "latest",
+    "y-map": "latest",
+    "y-memory": "latest",
+    "y-richtext": "latest",
+    "y-webrtc": "latest",
+    "y-websockets-client": "latest",
+    "y-text": "latest",
+    "y-indexeddb": "latest",
+    "y-xml": "latest",
+    "quill": "^1.0.0-rc.2",
+    "ace": "~1.2.3",
+    "ace-builds": "~1.2.3",
+    "jquery": "~2.2.2",
+    "d3": "^3.5.16",
+    "codemirror": "^5.25.0"
+  }
+}
--- a/examples/chat/index.html
+++ b/examples/chat/index.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+  <body>
+    <style>
+      #chat p span {
+        color: blue;
+      }
+    </style>
+    <div id="chat"></div>
+    <form id="chatform">
+      <input name="username" type="text" style="width:15%;">
+      <input name="message" type="text" style="width:60%;">
+      <input type="submit" value="Send">
+    </form>
+    <script src="../bower_components/yjs/y.js"></script>
+    <script src="./index.js"></script>
+  </body>
+</html>
--- a/examples/chat/index.js
+++ b/examples/chat/index.js
@@ -0,0 +1,73 @@
+/* global Y, chat */
+
+// initialize a shared object. This function call returns a promise!
+Y({
+  db: {
+    name: 'memory'
+  },
+  connector: {
+    name: 'websockets-client',
+    room: 'chat-example'
+  },
+  sourceDir: '/bower_components',
+  share: {
+    chat: 'Array'
+  }
+}).then(function (y) {
+  window.yChat = y
+  // This functions inserts a message at the specified position in the DOM
+  function appendMessage (message, position) {
+    var p = document.createElement('p')
+    var uname = document.createElement('span')
+    uname.appendChild(document.createTextNode(message.username + ': '))
+    p.appendChild(uname)
+    p.appendChild(document.createTextNode(message.message))
+    document.querySelector('#chat').insertBefore(p, chat.children[position] || null)
+  }
+  // This function makes sure that only 7 messages exist in the chat history.
+  // The rest is deleted
+  function cleanupChat () {
+    if (y.share.chat.length > 7) {
+      y.share.chat.delete(0, y.chat.length - 7)
+    }
+  }
+  // Insert the initial content
+  y.share.chat.toArray().forEach(appendMessage)
+  cleanupChat()
+
+  // whenever content changes, make sure to reflect the changes in the DOM
+  y.share.chat.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++) {
+        chat.children[event.index].remove()
+      }
+    }
+    // concurrent insertions may result in a history > 7, so cleanup here
+    cleanupChat()
+  })
+  document.querySelector('#chatform').onsubmit = function (event) {
+    // the form is submitted
+    var message = {
+      username: this.querySelector('[name=username]').value,
+      message: this.querySelector('[name=message]').value
+    }
+    if (message.username.length > 0 && message.message.length > 0) {
+      if (y.share.chat.length > 6) {
+        // If we are goint to insert the 8th element, make sure to delete first.
+        y.share.chat.delete(0)
+      }
+      // Here we insert a message in the shared chat type.
+      // This will call the observe function (see line 40)
+      // and reflect the change in the DOM
+      y.share.chat.push([message])
+      this.querySelector('[name=message]').value = ''
+    }
+    // Do not send this form!
+    event.preventDefault()
+    return false
+  }
+})
--- a/examples/codemirror/index.html
+++ b/examples/codemirror/index.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+  <head>
+  </head>
+  <body>
+    <div id="codeMirrorContainer"></div>
+
+    <script src="../bower_components/yjs/y.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">
+    <style>
+      .CodeMirror {
+        position: fixed;
+        top: 0;
+        left: 0;
+        height: 100%;
+        width: 100%;
+      }
+    </style>
+    <script src="./index.js"></script>
+  </body>
+</html>
--- a/examples/codemirror/index.js
+++ b/examples/codemirror/index.js
@@ -0,0 +1,24 @@
+/* global Y, CodeMirror */
+
+// initialize a shared object. This function call returns a promise!
+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
+
+  var editor = CodeMirror(document.querySelector('#codeMirrorContainer'), {
+    mode: 'javascript',
+    lineNumbers: true
+  })
+  y.share.codemirror.bindCodeMirror(editor)
+})
--- a/examples/drawing/index.html
+++ b/examples/drawing/index.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<body>
+  <style>
+    path {
+      fill: none;
+      stroke: blue;
+      stroke-width: 1px;
+      stroke-linejoin: round;
+      stroke-linecap: round;
+    }
+  </style>
+  <button type="button" id="clearDrawingCanvas">Clear Drawing</button>
+  <svg id="drawingCanvas" viewbox="0 0 100 100" width="100%"></svg>
+  <script src="../bower_components/yjs/y.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
@@ -0,0 +1,84 @@
+/* globals Y, d3 */
+'strict mode'
+
+Y({
+  db: {
+    name: 'memory'
+  },
+  connector: {
+    name: 'websockets-client',
+    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')
+
+  var svg = d3.select('#drawingCanvas')
+    .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) {
+    var 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
+      event.values.forEach(function (value) {
+        line.datum().push(value)
+      })
+      line.attr('d', renderPath)
+    })
+  }
+  // call drawLine every time an array is appended
+  y.share.drawing.observe(function (event) {
+    if (event.type === 'insert') {
+      event.values.forEach(drawLine)
+    } else {
+      // just remove all elements (thats what we do anyway)
+      svg.selectAll('path').remove()
+    }
+  })
+  // draw all existing content
+  for (var i = 0; i < drawing.length; i++) {
+    drawLine(drawing.get(i))
+  }
+
+  // clear canvas on request
+  document.querySelector('#clearDrawingCanvas').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
+      }, 33)
+      sharedLine.push([d3.mouse(this)])
+    }
+  }
+
+  function dragend () {
+    sharedLine = null
+    window.clearTimeout(ignoreDrag)
+    ignoreDrag = null
+  }
+})
--- a/examples/jigsaw/index.html
+++ b/examples/jigsaw/index.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <style type="text/css">
+    .draggable {
+      cursor: move;
+    }
+  </style>
+</head>
+<body>
+  <svg id="puzzle-example" width="100%" viewBox="0 0 800 800">
+    <g>
+      <path d="M 311.76636,154.23389 C 312.14136,171.85693 318.14087,184.97998 336.13843,184.23047 C 354.13647,183.48047 351.88647,180.48096 354.88599,178.98096 C 357.8855,177.48096 368.38452,170.35693 380.00806,169.98193 C 424.61841,168.54297 419.78296,223.6001 382.25757,223.6001 C 377.75806,223.6001 363.51001,219.10107 356.38599,211.97656 C 349.26196,204.85254 310.64185,207.10254 314.76636,236.34863 C 316.34888,247.5708 324.08374,267.90723 324.84595,286.23486 C 325.29321,296.99414 323.17603,307.00635 321.58911,315.6377 C 360.11353,305.4585 367.73462,304.30518 404.00513,312.83936 C 410.37915,314.33887 436.62573,310.21436 421.25269,290.3418 C 405.87964,270.46924 406.25464,248.34717 417.12817,240.84814 C 428.00171,233.34912 446.74976,228.84961 457.99829,234.09912 C 469.24683,239.34814 484.61987,255.84619 475.24585,271.59424 C 465.87231,287.34229 452.74878,290.7168 456.49829,303.84033 C 460.2478,316.96387 479.74536,320.33838 500.74292,321.83789 C 509.70142,322.47803 527.97192,323.28467 542.10864,320.12939 C 549.91821,318.38672 556.92212,315.89502 562.46753,313.56396 C 561.40796,277.80664 560.84888,245.71729 560.3606,241.97314 C 558.85278,230.41455 542.49536,217.28564 525.86499,223.2251 C 520.61548,225.1001 519.86548,231.84912 505.24243,232.59912 C 444.92798,235.69238 462.06958,143.26709 525.86499,180.48096 C 539.52759,188.45068 575.19409,190.7583 570.10913,156.85889 C 567.85962,141.86035 553.98608,102.86523 553.98608,102.86523 C 553.98608,102.86523 477.23755,111.82227 451.99878,91.991699 C 441.50024,83.74292 444.87476,69.494629 449.37427,61.245605 C 453.87378,52.996582 465.12231,46.622559 464.74731,36.123779 C 463.02563,-12.086426 392.96704,-10.902832 396.5061,36.873535 C 397.25562,46.997314 406.62964,52.621582 410.75415,60.495605 C 420.00757,78.161377 405.50024,96.073486 384.50757,99.490723 C 377.36206,100.65381 349.17505,102.65332 320.39429,102.23486 C 319.677,102.22461 318.95923,102.21143 318.24194,102.19775 C 315.08423,120.9751 311.55688,144.39697 311.76636,154.23389 z " style="fill:#f2c569;stroke:#000000" id="path2502"/>
+      <path d="M 500.74292,321.83789 C 479.74536,320.33838 460.2478,316.96387 456.49829,303.84033 C 452.74878,290.7168 465.87231,287.34229 475.24585,271.59424 C 484.61987,255.84619 469.24683,239.34814 457.99829,234.09912 C 446.74976,228.84961 428.00171,233.34912 417.12817,240.84814 C 406.25464,248.34717 405.87964,270.46924 421.25269,290.3418 C 436.62573,310.21436 410.37915,314.33887 404.00513,312.83936 C 367.73462,304.30518 360.11353,305.4585 321.58911,315.6377 C 320.56372,321.21484 319.75854,326.2207 320.01538,330.46191 C 320.76538,342.83545 329.3894,385.95508 327.8894,392.7041 C 326.3894,399.45312 313.64136,418.20117 297.89331,407.32715 C 282.14526,396.45361 276.52075,393.4541 265.27222,394.5791 C 254.02368,395.70361 239.77563,402.07812 239.77563,419.32568 C 239.77563,436.57373 250.27417,449.69727 268.64673,447.82227 C 287.36353,445.9126 317.92163,423.11035 325.63989,452.69678 C 330.1394,469.94434 330.51392,487.19238 330.1394,498.44092 C 329.95825,503.87646 326.09985,518.06592 322.16089,531.28125 C 353.2854,532.73682 386.47095,531.26611 394.2561,529.93701 C 430.30933,523.78174 429.31909,496.09766 412.62866,477.44385 C 406.25464,470.31934 401.75513,455.32129 405.87964,444.82275 C 414.07056,423.97314 458.8064,422.17773 473.37134,438.82324 C 483.86987,450.82178 475.99585,477.44385 468.49683,482.69287 C 453.52222,493.17529 457.22485,516.83008 473.37134,528.06201 C 504.79126,549.91943 572.35913,535.56152 572.35913,535.56152 C 572.35913,535.56152 567.85962,498.06592 567.48462,471.81934 C 567.10962,445.57275 589.60669,450.07227 593.3562,450.07227 C 597.10571,450.07227 604.22974,455.32129 609.47925,459.4458 C 614.72876,463.57031 618.85327,469.94434 630.85181,470.69434 C 677.43726,473.60596 674.58813,420.7373 631.97632,413.32666 C 623.35229,411.82666 614.72876,416.32617 603.10522,424.57519 C 591.48169,432.82422 577.23315,425.32519 570.10913,417.45117 C 566.07788,412.99561 563.8479,360.16406 562.46753,313.56396 C 556.92212,315.89502 549.91821,318.38672 542.10864,320.12939 C 527.97192,323.28467 509.70142,322.47803 500.74292,321.83789 z " style="fill:#f3f3d6;stroke:#000000" id="path2504"/>
+      <path d="M 240.52563,141.86035 C 257.60327,159.6499 243.94507,188.68799 214.65356,190.22949 C 185.09448,191.78516 164.66675,157.17822 190.28589,136.61621 C 200.49585,128.42139 198.05786,114.12158 179.78296,106.98975 C 154.4187,97.091553 90.54419,107.73975 90.54419,107.73975 C 90.54419,107.73975 100.88794,135.11328 101.41772,168.48242 C 101.79272,192.104 68.796875,189.47949 63.172607,186.85498 C 57.54834,184.23047 45.924805,173.73145 37.675781,173.73145 C -14.411865,173.73145 -10.013184,245.84375 39.925537,232.22412 C 48.174316,229.97461 56.42334,220.97559 68.796875,222.47559 C 81.17041,223.9751 87.544434,232.59912 87.544434,246.09766 C 87.544434,252.51709 87.0354,281.24268 86.340576,312.87012 C 119.15894,313.67676 160.60962,314.46582 170.03442,313.58887 C 186.15698,312.08936 195.90601,301.59033 188.40698,293.3418 C 180.90796,285.09277 156.16089,256.59619 179.03296,239.34814 C 201.90503,222.10059 235.65112,231.84912 239.77563,247.22217 C 243.90015,262.59521 240.52563,273.46924 234.90112,279.09326 C 229.27661,284.71777 210.52905,298.96582 221.40259,308.71484 C 232.27661,318.46338 263.77222,330.83691 302.39282,320.71338 C 309.58862,318.82715 315.92114,317.13525 321.58911,315.6377 C 323.17603,307.00635 325.29321,296.99414 324.84595,286.23486 C 324.08374,267.90723 316.34888,247.5708 314.76636,236.34863 C 310.64185,207.10254 349.26196,204.85254 356.38599,211.97656 C 363.51001,219.10107 377.75806,223.6001 382.25757,223.6001 C 419.78296,223.6001 424.61841,168.54297 380.00806,169.98193 C 368.38452,170.35693 357.8855,177.48096 354.88599,178.98096 C 351.88647,180.48096 354.13647,183.48047 336.13843,184.23047 C 318.14087,184.97998 312.14136,171.85693 311.76636,154.23389 C 311.55688,144.39697 315.08423,120.9751 318.24194,102.19775 C 290.37524,101.67725 262.46069,98.968262 254.39868,97.991211 C 233.38013,95.443359 217.17456,117.53662 240.52563,141.86035 z " style="fill:#bebcdb;stroke:#000000" id="path2506"/>
+      <path d="M 325.63989,452.69678 C 317.92163,423.11035 287.36353,445.9126 268.64673,447.82227 C 250.27417,449.69727 239.77563,436.57373 239.77563,419.32568 C 239.77563,402.07812 254.02368,395.70361 265.27222,394.5791 C 276.52075,393.4541 282.14526,396.45361 297.89331,407.32715 C 313.64136,418.20117 326.3894,399.45313 327.8894,392.7041 C 329.3894,385.95508 320.76538,342.83545 320.01538,330.46191 C 319.75855,326.2207 320.56372,321.21484 321.58911,315.6377 C 315.92114,317.13525 309.58862,318.82715 302.39282,320.71338 C 263.77222,330.83691 232.27661,318.46338 221.40259,308.71484 C 210.52905,298.96582 229.27661,284.71777 234.90112,279.09326 C 240.52563,273.46924 243.90015,262.59521 239.77563,247.22217 C 235.65112,231.84912 201.90503,222.10059 179.03296,239.34814 C 156.16089,256.59619 180.90796,285.09277 188.40698,293.3418 C 195.90601,301.59033 186.15698,312.08936 170.03442,313.58887 C 160.60962,314.46582 119.15894,313.67676 86.340576,312.87012 C 85.573975,347.74561 84.581299,386.15088 83.794922,402.07812 C 82.295166,432.44922 109.29175,422.32568 115.66577,420.82568 C 122.04028,419.32568 126.16479,409.57715 143.03735,408.45215 C 185.9231,405.59326 186.09985,466.69629 144.16235,467.69482 C 128.41431,468.06982 113.79126,451.19678 108.16675,447.44727 C 102.54272,443.69775 87.919433,442.94775 83.794922,457.9458 C 82.01709,464.41113 78.118652,481.65137 78.098144,496.18994 C 78.071045,515.38037 82.295166,531.81201 82.295166,531.81201 C 82.295166,531.81201 105.54224,526.5625 149.41187,526.5625 C 193.28149,526.5625 199.65552,547.93506 194.78101,558.80859 C 189.90649,569.68213 181.28296,568.93213 179.40796,583.18066 C 172.7063,634.11133 253.34106,631.08203 249.14917,584.68018 C 247.96948,571.62354 237.16528,571.66699 232.27661,557.68359 C 222.17944,528.80273 244.64966,523.56299 257.39819,524.68799 C 263.59351,525.23437 290.95679,529.73389 320.75757,531.21582 C 321.22437,531.23877 321.69312,531.25928 322.16089,531.28125 C 326.09985,518.06592 329.95825,503.87646 330.1394,498.44092 C 330.51392,487.19238 330.1394,469.94434 325.63989,452.69678 z " style="fill:#d3ea9d;stroke:#000000" id="path2508"/>
+		</g>
+  </svg>
+  <script src="../bower_components/yjs/y.js"></script>
+  <script src="../bower_components/d3/d3.js"></script>
+  <script src="./index.js"></script>
+</body>
+</html>
--- a/examples/jigsaw/index.js
+++ b/examples/jigsaw/index.js
@@ -0,0 +1,74 @@
+/* @flow */
+/* global Y, d3 */
+
+// initialize a shared object. This function call returns a promise!
+Y({
+  db: {
+    name: 'memory'
+  },
+  connector: {
+    name: 'websockets-client',
+    room: 'Puzzle-example'
+  },
+  sourceDir: '/bower_components',
+  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})
+    })
+
+  var data = [y.share.piece1, y.share.piece2, y.share.piece3, y.share.piece4]
+  var pieces = d3.select(document.querySelector('#puzzle-example')).selectAll('path').data(data)
+
+  pieces
+    .classed('draggable', true)
+    .attr('transform', function (piece) {
+      var translation = piece.get('translation') || {x: 0, y: 0}
+      return 'translate(' + translation.x + ',' + translation.y + ')'
+    }).call(drag)
+
+  data.forEach(function (piece) {
+    piece.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('translation') || {x: 0, y: 0}
+          return 'translate(' + translation.x + ',' + translation.y + ')'
+        })
+    })
+  })
+})
--- a/examples/monaco/index.html
+++ b/examples/monaco/index.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+  <head>
+  </head>
+  <body>
+    <div id="monacoContainer"></div>
+    <style>
+      #monacoContainer {
+        position: fixed;
+        top: 0;
+        left: 0;
+        height: 100%;
+        width: 100%;
+      }
+    </style>
+    <script src="../bower_components/yjs/y.js"></script>
+    <script src="../bower_components/y-array/y-array.js"></script>
+    <script src="../bower_components/y-text/y-text.js"></script>
+    <script src="../bower_components/y-websockets-client/y-websockets-client.js"></script>
+    <script src="../bower_components/y-memory/y-memory.js"></script>
+    <script src="../node_modules/monaco-editor/min/vs/loader.js"></script>
+    <script src="./index.js"></script>
+  </body>
+</html>
--- a/examples/monaco/index.js
+++ b/examples/monaco/index.js
@@ -0,0 +1,30 @@
+/* global Y, monaco */
+
+require.config({ paths: { 'vs': '../node_modules/monaco-editor/min/vs' } })
+
+require(['vs/editor/editor.main'], function () {
+  // 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
+    var editor = monaco.editor.create(document.getElementById('monacoContainer'), {
+      language: 'javascript'
+    })
+
+    // Bind to y.share.monaco
+    y.share.monaco.bindMonaco(editor)
+  })
+})
--- a/examples/package-lock.json
+++ b/examples/package-lock.json
--- a/examples/package.json
+++ b/examples/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "examples",
+  "version": "0.0.0",
+  "description": "",
+  "author": "Kevin Jahns",
+  "license": "MIT",
+  "dependencies": {
+    "monaco-editor": "^0.8.3"
+  },
+  "devDependencies": {
+    "standard": "^10.0.2"
+  },
+  "standard": {
+    "ignore": ["bower_components"]
+  }
+}
--- a/examples/quill/index.html
+++ b/examples/quill/index.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <!-- quill does not include dist files! We are using the hosted version instead -->
+  <!--link rel="stylesheet" href="../bower_components/quill/dist/quill.snow.css" /-->
+  <link href="https://cdn.quilljs.com/1.0.4/quill.snow.css" rel="stylesheet">
+  <link href="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.5.1/katex.min.css" rel="stylesheet">
+  <link href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.2.0/styles/monokai-sublime.min.css" rel="stylesheet">
+  <style>
+    #quill-container {
+      border: 1px solid gray;
+      box-shadow: 0px 0px 10px gray;
+    }
+  </style>
+</head>
+<body>
+  <div id="quill-container">
+    <div id="quill">
+    </div>
+  </div>
+
+  <script src="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.5.1/katex.min.js" type="text/javascript"></script>
+  <script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.2.0/highlight.min.js" type="text/javascript"></script>
+  <script src="https://cdn.quilljs.com/1.0.4/quill.js"></script>
+  <!-- quill does not include dist files! We are using the hosted version instead (see above)
+  <script src="../bower_components/quill/dist/quill.js"></script>
+  -->
+  <script src="../bower_components/yjs/y.js"></script>
+  <script src="./index.js"></script>
+</body>
+</html>
--- a/examples/quill/index.js
+++ b/examples/quill/index.js
@@ -0,0 +1,39 @@
+/* global Y, Quill */
+
+// initialize a shared object. This function call returns a promise!
+
+Y({
+  db: {
+    name: 'memory'
+  },
+  connector: {
+    name: 'websockets-client',
+    room: 'richtext-example-quill-1.0-test'
+  },
+  sourceDir: '/bower_components',
+  share: {
+    richtext: 'Richtext' // y.share.richtext is of type Y.Richtext
+  }
+}).then(function (y) {
+  window.yQuill = y
+
+  // create quill element
+  window.quill = new Quill('#quill', {
+    modules: {
+      formula: true,
+      syntax: true,
+      toolbar: [
+        [{ size: ['small', false, 'large', 'huge'] }],
+        ['bold', 'italic', 'underline'],
+        [{ color: [] }, { background: [] }],    // Snow theme fills in values
+        [{ script: 'sub' }, { script: 'super' }],
+        ['link', 'image'],
+        ['link', 'code-block'],
+        [{ list: 'ordered' }]
+      ]
+    },
+    theme: 'snow'
+  })
+  // bind quill to richtext type
+  y.share.richtext.bind(window.quill)
+})
--- a/examples/serviceworker/index.html
+++ b/examples/serviceworker/index.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <!-- quill does not include dist files! We are using the hosted version instead -->
+  <!--link rel="stylesheet" href="../bower_components/quill/dist/quill.snow.css" /-->
+  <link href="https://cdn.quilljs.com/1.0.4/quill.snow.css" rel="stylesheet">
+  <link href="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.5.1/katex.min.css" rel="stylesheet">
+  <link href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.2.0/styles/monokai-sublime.min.css" rel="stylesheet">
+  <style>
+    #quill-container {
+      border: 1px solid gray;
+      box-shadow: 0px 0px 10px gray;
+    }
+  </style>
+</head>
+<body>
+  <div id="quill-container">
+    <div id="quill">
+    </div>
+  </div>
+
+  <script src="//cdnjs.cloudflare.com/ajax/libs/KaTeX/0.5.1/katex.min.js" type="text/javascript"></script>
+  <script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.2.0/highlight.min.js" type="text/javascript"></script>
+  <script src="https://cdn.quilljs.com/1.0.4/quill.js"></script>
+  <!-- quill does not include dist files! We are using the hosted version instead (see above)
+  <script src="../bower_components/quill/dist/quill.js"></script>
+  -->
+  <script src="../bower_components/yjs/y.js"></script>
+  <script src="./index.js"></script>
+</body>
+</html>
--- a/examples/serviceworker/index.js
+++ b/examples/serviceworker/index.js
@@ -0,0 +1,49 @@
+/* global Y, Quill */
+
+// register yjs service worker
+if ('serviceWorker' in navigator) {
+  // Register service worker
+  // it is important to copy yjs-sw-template to the root directory!
+  navigator.serviceWorker.register('./yjs-sw-template.js').then(function (reg) {
+    console.log('Yjs service worker registration succeeded. Scope is ' + reg.scope)
+  }).catch(function (err) {
+    console.error('Yjs service worker registration failed with error ' + err)
+  })
+}
+
+// initialize a shared object. This function call returns a promise!
+Y({
+  db: {
+    name: 'memory'
+  },
+  connector: {
+    name: 'serviceworker',
+    room: 'ServiceWorkerExample2'
+  },
+  sourceDir: '/bower_components',
+  share: {
+    richtext: 'Richtext' // y.share.richtext is of type Y.Richtext
+  }
+}).then(function (y) {
+  window.yServiceWorker = y
+
+  // create quill element
+  window.quill = new Quill('#quill', {
+    modules: {
+      formula: true,
+      syntax: true,
+      toolbar: [
+        [{ size: ['small', false, 'large', 'huge'] }],
+        ['bold', 'italic', 'underline'],
+        [{ color: [] }, { background: [] }],    // Snow theme fills in values
+        [{ script: 'sub' }, { script: 'super' }],
+        ['link', 'image'],
+        ['link', 'code-block'],
+        [{ list: 'ordered' }]
+      ]
+    },
+    theme: 'snow'
+  })
+  // bind quill to richtext type
+  y.share.richtext.bind(window.quill)
+})
--- a/examples/serviceworker/yjs-sw-template.js
+++ b/examples/serviceworker/yjs-sw-template.js
@@ -0,0 +1,22 @@
+/* eslint-env worker */
+
+// copy and modify this file
+
+self.DBConfig = {
+  name: 'indexeddb'
+}
+self.ConnectorConfig = {
+  name: 'websockets-client',
+  // url: '..',
+  options: {
+    jsonp: false
+  }
+}
+
+importScripts(
+  '/bower_components/yjs/y.js',
+  '/bower_components/y-memory/y-memory.js',
+  '/bower_components/y-indexeddb/y-indexeddb.js',
+  '/bower_components/y-websockets-client/y-websockets-client.js',
+  '/bower_components/y-serviceworker/yjs-sw-include.js'
+)
--- a/examples/textarea/index.html
+++ b/examples/textarea/index.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+<body>
+  <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-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/dist/y-websockets-client.js"></script>
+  <script src="./index.js"></script>
+</body>
+</html>
--- a/examples/textarea/index.js
+++ b/examples/textarea/index.js
@@ -0,0 +1,23 @@
+/* global Y */
+
+// initialize a shared object. This function call returns a promise!
+Y({
+  db: {
+    name: 'memory'
+  },
+  connector: {
+    name: 'websockets-client',
+    room: 'Textarea-example'
+    // url: '127.0.0.1:1234'
+  },
+  sourceDir: '/bower_components',
+  share: {
+    textarea: 'Text' // y.share.textarea is of type Y.Text
+  }
+}).then(function (y) {
+  window.yTextarea = y
+
+  // bind the textarea to a shared text element
+  y.share.textarea.bind(document.getElementById('textfield'))
+  // thats it..
+})
--- a/examples/xml/index.html
+++ b/examples/xml/index.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+</head>
+  <script src="../bower_components/yjs/y.js"></script>
+  <script src="../bower_components/jquery/dist/jquery.min.js"></script>
+  <script src="./index.js"></script>
+</head>
+<body>
+  <h1> Shared DOM Example </h1>
+  <p> Use native DOM function or jQuery to manipulate the shared DOM (window.sharedDom). </p>
+  <div class="command">
+    <button type="button">Execute</button>
+    <input type="text" value='$(sharedDom).append("<h3>Appended headline</h3>")' size="40"/>
+  </div>
+  <div class="command">
+    <button type="button">Execute</button>
+    <input type="text" value='$(sharedDom).attr("align","right")' size="40"/>
+  </div>
+  <div class="command">
+    <button type="button">Execute</button>
+    <input type="text" value='$(sharedDom).attr("style","color:blue;")' size="40"/>
+  </div>
+
+  <script>
+    var commands = document.querySelectorAll(".command");
+    Array.prototype.forEach.call(document.querySelectorAll('.command'), function (command) {
+      var execute = function(){
+        eval(command.querySelector("input").value);
+      }
+      command.querySelector("button").onclick = execute
+      $(command.querySelector("input")).keyup(function (e) {
+        if (e.keyCode == 13) {
+          execute()
+        }
+      })
+    })
+  </script>
+</body>
+</html>
--- a/examples/xml/index.js
+++ b/examples/xml/index.js
@@ -0,0 +1,21 @@
+/* global Y */
+
+// initialize a shared object. This function call returns a promise!
+Y({
+  db: {
+    name: 'memory'
+  },
+  connector: {
+    name: 'websockets-client',
+    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)
+})
--- a/gulpfile.helper.js
+++ b/gulpfile.helper.js
@@ -1,214 +0,0 @@
-
-var $ = require('gulp-load-plugins')()
-var minimist = require('minimist')
-var browserify = require('browserify')
-var source = require('vinyl-source-stream')
-var buffer = require('vinyl-buffer')
-
-module.exports = function (gulp, helperOptions) {
-  var runSequence = require('run-sequence').use(gulp)
-  var options = minimist(process.argv.slice(2), {
-    string: ['modulename', 'export', 'name', 'port', 'testfiles', 'es6'],
-    default: {
-      moduleName: helperOptions.moduleName,
-      targetName: helperOptions.targetName,
-      export: 'ignore',
-      port: '8888',
-      testfiles: '**/*.spec.js',
-      es6: false,
-      browserify: helperOptions.browserify != null ? helperOptions.browserify : false,
-      includeRuntime: helperOptions.includeRuntime || false,
-      debug: false
-    }
-  })
-  if (options.es6 !== false) {
-    options.es6 = true
-  }
-  var files = {
-    dist: helperOptions.entry,
-    specs: helperOptions.specs,
-    src: './src/**/*.js'
-  }
-
-  if (options.includeRuntime) {
-    files.distEs5 = ['node_modules/regenerator/runtime.js', files.dist]
-  } else {
-    files.distEs5 = [files.dist]
-  }
-
-  var header = require('gulp-header')
-  var banner = ['/**',
-    ' * <%= pkg.name %> - <%= pkg.description %>',
-    ' * @version v<%= pkg.version %>',
-    ' * @link <%= pkg.homepage %>',
-    ' * @license <%= pkg.license %>',
-    ' */',
-    ''].join('\n')
-
-  gulp.task('dist:es5', function () {
-    var babelOptions = {
-      presets: ['es2015']
-    }
-    return (browserify({
-      entries: files.distEs5,
-      debug: true,
-      standalone: options.moduleName
-    }).transform('babelify', babelOptions)
-      .bundle()
-      .pipe(source(options.targetName))
-      .pipe(buffer())
-      .pipe($.sourcemaps.init({loadMaps: true}))
-      .pipe($.if(!options.debug, $.uglify().on('error', function (e) {
-        console.log('\x07', e.message, JSON.stringify(e)); return this.end()
-      })))
-      .pipe(header(banner, { pkg: require('./package.json') }))
-      .pipe($.sourcemaps.write('.'))
-      .pipe(gulp.dest('./dist/')))
-  })
-
-  gulp.task('dist:es6', function () {
-    return (browserify({
-      entries: files.dist,
-      debug: true,
-      standalone: options.moduleName
-    }).bundle()
-      .pipe(source(options.targetName))
-      .pipe(buffer())
-      .pipe($.sourcemaps.init({loadMaps: true}))
-      // .pipe($.uglify()) -- generators not yet supported see #448
-      .pipe($.rename({
-        extname: '.es6'
-      }))
-      .pipe(header(banner, { pkg: require('./package.json') }))
-      .pipe($.sourcemaps.write('.'))
-      .pipe(gulp.dest('./dist/')))
-  })
-
-  gulp.task('dist', ['dist:es6', 'dist:es5'])
-
-  gulp.task('watch:dist', function (cb) {
-    options.debug = true
-    gulp.src(['./README.md'])
-      .pipe($.watch('./README.md'))
-      .pipe(gulp.dest('./dist/'))
-    runSequence('dist', function () {
-      gulp.watch(files.src.concat('./README.md'), ['dist'])
-      cb()
-    })
-  })
-
-  gulp.task('dev:node', ['test'], function () {
-    gulp.watch(files.src, ['test'])
-  })
-
-  gulp.task('spec-build', function () {
-    var browserify = require('browserify')
-    var source = require('vinyl-source-stream')
-    var buffer = require('vinyl-buffer')
-
-    return browserify({
-      entries: files.specs, // .concat(files.distEs5),
-      debug: true
-    })// .transform('babelify', { presets: ['es2015'] })
-      .bundle()
-      .pipe(source('specs.js'))
-      .pipe(buffer())
-      // .pipe($.sourcemaps.init({loadMaps: true}))
-      // .pipe($.sourcemaps.write('.'))
-      .pipe(gulp.dest('./build/'))
-  })
-
-  gulp.task('dev:browser', ['spec-build'], function () {
-    gulp.watch(files.src, ['spec-build'])
-    return gulp.src('./build/specs.js')
-      .pipe($.jasmineBrowser.specRunner())
-      .pipe($.jasmineBrowser.server({port: options.port}))
-  })
-
-  gulp.task('test', function () {
-    return gulp.src(files.specs)
-      .pipe($.jasmine({
-        verbose: true,
-        includeStuckTrace: true
-      }))
-  })
-
-  gulp.task('updateSubmodule', function () {
-    return gulp.src('./package.json', {read: false})
-      .pipe($.shell([
-        'git submodule update --init',
-        'cd dist && git pull origin dist'
-      ]))
-  })
-
-  gulp.task('bump', function (cb) {
-    gulp.src(['./package.json', './bower.json', './dist/bower.json'], {base: '.'})
-      .pipe($.prompt.prompt({
-        type: 'checkbox',
-        name: 'bump',
-        message: 'What type of bump would you like to do?',
-        choices: ['patch', 'minor', 'major']
-      }, function (res) {
-        if (res.bump.length === 0) {
-          console.info('You have to select a bump type. Now I\'m going to use "patch" as bump type..')
-        }
-        var bumptype = res.bump[0]
-        if (bumptype === 'major') {
-          runSequence('bump_major', cb)
-        } else if (bumptype === 'minor') {
-          runSequence('bump_minor', cb)
-        } else {
-          runSequence('bump_patch', cb)
-        }
-      }))
-  })
-  gulp.task('bump_patch', function () {
-    return gulp.src(['./package.json', './bower.json', './dist/bower.json'], {base: '.'})
-      .pipe($.bump({type: 'patch'}))
-      .pipe(gulp.dest('./'))
-  })
-  gulp.task('bump_minor', function () {
-    return gulp.src(['./package.json', './bower.json', './dist/bower.json'], {base: '.'})
-      .pipe($.bump({type: 'minor'}))
-      .pipe(gulp.dest('./'))
-  })
-  gulp.task('bump_major', function () {
-    return gulp.src(['./package.json', './bower.json', './dist/bower.json'], {base: '.'})
-      .pipe($.bump({type: 'major'}))
-      .pipe(gulp.dest('./'))
-  })
-
-  gulp.task('publish_commits', function () {
-    return gulp.src('./package.json')
-        .pipe($.prompt.confirm({
-          message: 'Are you sure you want to publish this release?',
-          default: false
-        }))
-        .pipe($.shell([
-          'cp README.md dist',
-          'standard',
-          'echo "Deploying version <%= getVersion(file.path) %>"',
-          'git pull',
-          'cd ./dist/ && git add -A',
-          'cd ./dist/ && git commit -am "Deploy <%= getVersion(file.path) %>" -n',
-          'cd ./dist/ && git push origin HEAD:dist',
-          'cd ./dist/ && git tag -a v<%= getVersion(file.path) %> -m "Release <%= getVersion(file.path) %>"',
-          'cd ./dist/ && git push origin --tags',
-          'git commit -am "Release <%= getVersion(file.path) %>" -n',
-          'git push',
-          'npm publish',
-          'echo Finished'
-        ], {
-          templateData: {
-            getVersion: function () {
-              return JSON.parse(String.fromCharCode.apply(null, this.file._contents)).version
-            }
-          }
-        }))
-  })
-
-  gulp.task('publish', function (cb) {
-    /* TODO: include 'test',*/
-    runSequence('updateSubmodule', 'bump', 'dist', 'publish_commits', cb)
-  })
-}
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -1,104 +0,0 @@
-/* eslint-env node */
-
-/** Gulp Commands
-
-  gulp command*
-    [--export ModuleType]
-    [--name ModuleName]
-    [--testport TestPort]
-    [--testfiles TestFiles]
-
-  Module name (ModuleName):
-    Compile this to "y.js" (default)
-
-  Supported module types (ModuleType):
-    - amd
-    - amdStrict
-    - common
-    - commonStrict
-    - ignore (default)
-    - system
-    - umd
-    - umdStrict
-
-  Test port (TestPort):
-    Serve the specs on port 8888 (default)
-
-  Test files (TestFiles):
-    Specify which specs to use!
-
-  Commands:
-    - build:deploy
-        Build this library for deployment (es6->es5, minified)
-    - dev:browser
-        Watch the ./src directory.
-        Builds the library on changes.
-        Starts an http-server and serves the test suite on http://127.0.0.1:8888.
-    - dev:node
-        Watch the ./src directory.
-        Builds and specs the library on changes.
-        Usefull to run with node-inspector.
-        `node-debug $(which gulp) dev:node
-    - test:
-        Test this library
-*/
-
-var gulp = require('gulp')
-var $ = require('gulp-load-plugins')()
-var runSequence = require('run-sequence').use(gulp)
-
-require('./gulpfile.helper.js')(gulp, {
-  polyfills: [],
-  entry: './src/y.js',
-  targetName: 'y.js',
-  moduleName: 'Y',
-  includeRuntime: true,
-  specs: [
-    './src/Database.spec.js',
-    '../y-array/src/Array.spec.js',
-    '../y-map/src/Map.spec.js'
-  ]
-})
-
-gulp.task('dev:examples', ['watch:dist'], function () {
-  // watch all distfiles and copy them to bower_components
-  var distfiles = ['./dist/*.{js,es6}', './dist/*.{js,es6}.map', '../y-*/dist/*.{js,es6}', '../y-*/dist/*.{js,es6}.map']
-  gulp.src(distfiles)
-    .pipe($.watch(distfiles))
-    .pipe($.rename(function (path) {
-      var dir = path.dirname.split(/[\\\/]/)[0]
-      console.log(JSON.stringify(path))
-      path.dirname = dir === '.' ? 'yjs' : dir
-    }))
-    .pipe(gulp.dest('./dist/Examples/bower_components/'))
-
-  return $.serve('dist/Examples/')()
-})
-
-gulp.task('default', ['updateSubmodule'], function (cb) {
-  gulp.src('package.json')
-    .pipe($.prompt.prompt({
-      type: 'checkbox',
-      name: 'tasks',
-      message: 'Which tasks would you like to run?',
-      choices: [
-        'test                    Test this project',
-        'dev:examples            Serve the examples directory in ./dist/',
-        'dev:browser             Watch files & serve the testsuite for the browser',
-        'dev:nodejs              Watch filse & test this project with nodejs',
-        'bump                    Bump the current state of the project',
-        'publish                 Publish this project. Creates a github tag',
-        'dist                    Build the distribution files'
-      ]
-    }, function (res) {
-      var tasks = res.tasks.map(function (task) {
-        return task.split(' ')[0]
-      })
-      if (tasks.length > 0) {
-        console.info('gulp ' + tasks.join(' '))
-        runSequence(tasks, cb)
-      } else {
-        console.info('Ok, .. goodbye')
-      }
-    }))
-})
--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@@ -1,24 +1,23 @@
 {
  "name": "yjs",
-  "version": "12.3.1",
+  "version": "13.0.0-3",
  "description": "A framework for real-time p2p shared editing on any data",
-  "main": "./src/y.js",
+  "main": "./y.js",
  "scripts": {
-    "test": "node --harmony ./node_modules/.bin/gulp test",
-    "lint": "./node_modules/.bin/standard"
+    "test": "npm run lint",
+    "lint": "standard",
+    "dist": "rollup -c rollup.dist.js",
+    "serve": "concurrently 'serve ..' 'rollup -wc rollup.dist.js -o examples/bower_components/yjs/y.js'",
+    "postversion": "npm run dist",
+    "postpublish": "tag-dist-files --overwrite-existing-tag"
  },
-  "pre-commit": [
-    "lint",
-    "test"
+  "files": [
+    "y.*"
  ],
  "standard": {
-    "parser": "babel-eslint",
    "ignore": [
-      "build/**",
-      "dist/**",
-      "declarations/**",
-      "./y.js",
-      "./y.js.map"
+      "/y.js",
+      "/y.js.map"
    ]
  },
  "repository": {
@@ -42,41 +41,25 @@
  },
  "homepage": "http://y-js.org",
  "devDependencies": {
-    "babel-eslint": "^5.0.0-beta6",
-    "babel-plugin-transform-runtime": "^6.1.18",
-    "babel-preset-es2015": "^6.1.18",
-    "babelify": "^7.2.0",
-    "browserify": "^12.0.1",
-    "eslint": "^1.10.2",
-    "gulp": "^3.9.0",
-    "gulp-bump": "^1.0.0",
-    "gulp-concat": "^2.6.0",
-    "gulp-filter": "^3.0.1",
-    "gulp-git": "^1.6.0",
-    "gulp-header": "^1.8.8",
-    "gulp-if": "^2.0.0",
-    "gulp-jasmine": "^2.0.1",
-    "gulp-jasmine-browser": "^0.2.3",
-    "gulp-load-plugins": "^1.0.0",
-    "gulp-prompt": "^0.1.2",
-    "gulp-rename": "^1.2.2",
-    "gulp-serve": "^1.2.0",
-    "gulp-shell": "^0.5.1",
-    "gulp-sourcemaps": "^1.5.2",
-    "gulp-tag-version": "^1.3.0",
-    "gulp-uglify": "^2.0.0",
-    "gulp-util": "^3.0.6",
-    "gulp-watch": "^4.3.5",
-    "minimist": "^1.2.0",
-    "pre-commit": "^1.1.1",
-    "regenerator": "^0.8.42",
-    "run-sequence": "^1.1.4",
-    "seedrandom": "^2.4.2",
-    "standard": "^5.2.2",
-    "vinyl-buffer": "^1.0.0",
-    "vinyl-source-stream": "^1.1.0"
+    "babel-cli": "^6.24.1",
+    "babel-plugin-external-helpers": "^6.22.0",
+    "babel-plugin-transform-regenerator": "^6.24.1",
+    "babel-plugin-transform-runtime": "^6.23.0",
+    "babel-preset-latest": "^6.24.1",
+    "chance": "^1.0.9",
+    "concurrently": "^3.4.0",
+    "rollup-plugin-babel": "^2.7.1",
+    "rollup-plugin-commonjs": "^8.0.2",
+    "rollup-plugin-inject": "^2.0.0",
+    "rollup-plugin-multi-entry": "^2.0.1",
+    "rollup-plugin-node-resolve": "^3.0.0",
+    "rollup-plugin-uglify": "^1.0.2",
+    "rollup-regenerator-runtime": "^6.23.1",
+    "rollup-watch": "^3.2.2",
+    "standard": "^10.0.2",
+    "tag-dist-files": "^0.1.6"
  },
  "dependencies": {
-    "debug": "^2.6.3"
+    "debug": "^2.6.8"
  }
 }
--- a/rollup.dist.js
+++ b/rollup.dist.js
@@ -0,0 +1,47 @@
+import inject from 'rollup-plugin-inject'
+import babel from 'rollup-plugin-babel'
+import uglify from 'rollup-plugin-uglify'
+import nodeResolve from 'rollup-plugin-node-resolve'
+import commonjs from 'rollup-plugin-commonjs'
+var pkg = require('./package.json')
+
+export default {
+  entry: 'src/y.js',
+  moduleName: 'Y',
+  format: 'umd',
+  plugins: [
+    nodeResolve({
+      main: true,
+      module: true,
+      browser: true
+    }),
+    commonjs(),
+    babel({
+      runtimeHelpers: true
+    }),
+    inject({
+      regeneratorRuntime: 'regenerator-runtime'
+    }),
+    uglify({
+      output: {
+        comments: function (node, comment) {
+          var text = comment.value
+          var type = comment.type
+          if (type === 'comment2') {
+            // multiline comment
+            return /@license/i.test(text)
+          }
+        }
+      }
+    })
+  ],
+  dest: 'y.js',
+  sourceMap: true,
+  banner: `
+/**
+ * ${pkg.name} - ${pkg.description}
+ * @version v${pkg.version}
+ * @license ${pkg.license}
+ */
+`
+}
--- a/rollup.test.js
+++ b/rollup.test.js
@@ -0,0 +1,20 @@
+import nodeResolve from 'rollup-plugin-node-resolve'
+import commonjs from 'rollup-plugin-commonjs'
+import multiEntry from 'rollup-plugin-multi-entry'
+
+export default {
+  entry: 'tests/*.js',
+  moduleName: 'y-array-tests',
+  format: 'umd',
+  plugins: [
+    nodeResolve({
+      main: true,
+      module: true,
+      browser: true
+    }),
+    commonjs(),
+    multiEntry()
+  ],
+  dest: 'y-array.test.js',
+  sourceMap: true
+}
--- a/src/Connector.js
+++ b/src/Connector.js
@@ -4,7 +4,7 @@
 function canRead (auth) { return auth === 'read' || auth === 'write' }
 function canWrite (auth) { return auth === 'write' }

-module.exports = function (Y/* :any */) {
+export default function extendConnector (Y/* :any */) {
  class AbstractConnector {
    /* ::
    y: YConfig;
@@ -59,12 +59,11 @@ module.exports = function (Y/* :any */) {
      this.syncingClients = []
      this.forwardToSyncingClients = opts.forwardToSyncingClients !== false
      this.debug = opts.debug === true
-      this.syncStep2 = Promise.resolve()
      this.broadcastOpBuffer = []
      this.protocolVersion = 11
      this.authInfo = opts.auth || null
      this.checkAuth = opts.checkAuth || function () { return Promise.resolve('write') } // default is everyone has write access
-      if (opts.generateUserId === true) {
+      if (opts.generateUserId !== false) {
        this.setUserId(Y.utils.generateGuid())
      }
    }
@@ -113,7 +112,7 @@ module.exports = function (Y/* :any */) {
      this.userEventListeners.push(f)
    }
    removeUserEventListener (f) {
-      this.userEventListeners = this.userEventListeners.filter(g => { f !== g })
+      this.userEventListeners = this.userEventListeners.filter(g => f !== g)
    }
    userLeft (user) {
      if (this.connections[user] != null) {
@@ -146,6 +145,9 @@ module.exports = function (Y/* :any */) {
        isSynced: false,
        role: role
      }
+      let defer = {}
+      defer.promise = new Promise(function (resolve) { defer.resolve = resolve })
+      this.connections[user].syncStep2 = defer
      for (var f of this.userEventListeners) {
        f({
          action: 'userJoined',
@@ -181,13 +183,13 @@ module.exports = function (Y/* :any */) {
      var conn = this
      if (syncUser != null) {
        this.currentSyncTarget = syncUser
-        this.y.db.requestTransaction(function *() {
-          var stateSet = yield* this.getStateSet()
-          var deleteSet = yield* this.getDeleteSet()
+        this.y.db.requestTransaction(function * () {
+          var stateSet = yield * this.getStateSet()
+          // var deleteSet = yield * this.getDeleteSet()
          var answer = {
            type: 'sync step 1',
            stateSet: stateSet,
-            deleteSet: deleteSet,
+            // deleteSet: deleteSet,
            protocolVersion: conn.protocolVersion,
            auth: conn.authInfo
          }
@@ -198,11 +200,12 @@ module.exports = function (Y/* :any */) {
        })
      } else {
        if (!conn.isSynced) {
-          this.y.db.requestTransaction(function *() {
+          this.y.db.requestTransaction(function * () {
            if (!conn.isSynced) {
              // it is crucial that isSynced is set at the time garbageCollectAfterSync is called
              conn.isSynced = true
-              yield* this.garbageCollectAfterSync()
+              // It is safer to remove this!
+              // TODO: remove: yield * this.garbageCollectAfterSync()
              // call whensynced listeners
              for (var f of conn.whenSyncedListeners) {
                f()
@@ -240,11 +243,7 @@ module.exports = function (Y/* :any */) {
      }
      if (this.broadcastOpBuffer.length === 0) {
        this.broadcastOpBuffer = ops
-        if (this.y.db.transactionInProgress) {
-          this.y.db.whenTransactionsFinished().then(broadcastOperations)
-        } else {
-          setTimeout(broadcastOperations, 0)
-        }
+        this.y.db.whenTransactionsFinished().then(broadcastOperations)
      } else {
        this.broadcastOpBuffer = this.broadcastOpBuffer.concat(ops)
      }
@@ -268,7 +267,7 @@ module.exports = function (Y/* :any */) {
          type: 'sync stop',
          protocolVersion: this.protocolVersion
        })
-        return Promise.reject('Incompatible protocol version')
+        return Promise.reject(new Error('Incompatible protocol version'))
      }
      if (message.auth != null && this.connections[sender] != null) {
        // authenticate using auth in message
@@ -292,82 +291,80 @@ module.exports = function (Y/* :any */) {
          if (message.type === 'sync step 1' && canRead(auth)) {
            let conn = this
            let m = message
+            let wait // wait for sync step 2 to complete
+            if (this.role === 'slave') {
+              wait = Promise.all(Object.keys(this.connections)
+                .map(uid => this.connections[uid])
+                .filter(conn => conn.role === 'master')
+                .map(conn => conn.syncStep2.promise)
+              )
+            } else {
+              wait = Promise.resolve()
+            }
+            wait.then(() => {
+              this.y.db.requestTransaction(function * () {
+                var currentStateSet = yield * this.getStateSet()
+                // TODO: remove
+                // if (canWrite(auth)) {
+                //  yield * this.applyDeleteSet(m.deleteSet)
+                // }

-            this.y.db.requestTransaction(function *() {
-              var currentStateSet = yield* this.getStateSet()
-              if (canWrite(auth)) {
-                yield* this.applyDeleteSet(m.deleteSet)
-              }
-
-              var ds = yield* this.getDeleteSet()
-              var answer = {
-                type: 'sync step 2',
-                stateSet: currentStateSet,
-                deleteSet: ds,
-                protocolVersion: this.protocolVersion,
-                auth: this.authInfo
-              }
-              if (message.preferUntransformed === true && Object.keys(m.stateSet).length === 0) {
-                answer.osUntransformed = yield* this.getOperationsUntransformed()
-              } else {
-                answer.os = yield* this.getOperations(m.stateSet)
-              }
-              conn.send(sender, answer)
-              if (this.forwardToSyncingClients) {
-                conn.syncingClients.push(sender)
-                setTimeout(function () {
-                  conn.syncingClients = conn.syncingClients.filter(function (cli) {
-                    return cli !== sender
-                  })
+                var ds = yield * this.getDeleteSet()
+                var answer = {
+                  type: 'sync step 2',
+                  stateSet: currentStateSet,
+                  deleteSet: ds,
+                  protocolVersion: this.protocolVersion,
+                  auth: this.authInfo
+                }
+                if (message.preferUntransformed === true && Object.keys(m.stateSet).length === 0) {
+                  answer.osUntransformed = yield * this.getOperationsUntransformed()
+                } else {
+                  answer.os = yield * this.getOperations(m.stateSet)
+                }
+                conn.send(sender, answer)
+                if (this.forwardToSyncingClients) {
+                  conn.syncingClients.push(sender)
+                  setTimeout(function () {
+                    conn.syncingClients = conn.syncingClients.filter(function (cli) {
+                      return cli !== sender
+                    })
+                    conn.send(sender, {
+                      type: 'sync done'
+                    })
+                  }, 5000) // TODO: conn.syncingClientDuration)
+                } else {
                  conn.send(sender, {
                    type: 'sync done'
                  })
-                }, 5000) // TODO: conn.syncingClientDuration)
-              } else {
-                conn.send(sender, {
-                  type: 'sync done'
-                })
-              }
+                }
+              })
            })
          } else if (message.type === 'sync step 2' && canWrite(auth)) {
            var db = this.y.db
-            var defer = {}
-            defer.promise = new Promise(function (resolve) {
-              defer.resolve = resolve
-            })
-            this.syncStep2 = defer.promise
-            let m /* :MessageSyncStep2 */ = message
+            let defer = this.connections[sender].syncStep2
+            let m = message
+            // apply operations first
            db.requestTransaction(function * () {
-              yield* this.applyDeleteSet(m.deleteSet)
+              // yield * this.applyDeleteSet(m.deleteSet)
              if (m.osUntransformed != null) {
-                yield* this.applyOperationsUntransformed(m.osUntransformed, m.stateSet)
+                yield * this.applyOperationsUntransformed(m.osUntransformed, m.stateSet)
              } else {
                this.store.apply(m.os)
              }
-              /*
-               * This just sends the complete hb after some time
-               * Mostly for debugging..
-               *
+              // defer.resolve()
+            })
+            // then apply ds
+            db.whenTransactionsFinished().then(() => {
              db.requestTransaction(function * () {
-                var ops = yield* this.getOperations(m.stateSet)
-                if (ops.length > 0) {
-                  if (!broadcastHB) { // TODO: consider to broadcast here..
-                    conn.send(sender, {
-                      type: 'update',
-                      ops: ops
-                    })
-                  } else {
-                    // broadcast only once!
-                    conn.broadcastOps(ops)
-                  }
-                }
+                yield * this.applyDeleteSet(m.deleteSet)
              })
-              */
              defer.resolve()
            })
+            return defer.promise
          } else if (message.type === 'sync done') {
            var self = this
-            this.syncStep2.then(function () {
+            this.connections[sender].syncStep2.promise.then(function () {
              self._setSyncedWith(sender)
            })
          } else if (message.type === 'update' && canWrite(auth)) {
@@ -388,7 +385,7 @@ module.exports = function (Y/* :any */) {
          }
        })
      } else {
-        return Promise.reject('Unable to deliver message')
+        return Promise.reject(new Error('Unable to deliver message'))
      }
    }
    _setSyncedWith (user) {
--- a/src/Database.js
+++ b/src/Database.js
@@ -1,7 +1,7 @@
 /* @flow */
 'use strict'

-module.exports = function (Y /* :any */) {
+export default function extendDatabase (Y /* :any */) {
  /*
    Partial definition of an OperationStore.
    TODO: name it Database, operation store only holds operations.
@@ -39,14 +39,15 @@ module.exports = function (Y /* :any */) {
    */
    constructor (y, opts) {
      this.y = y
+      opts.gc = opts.gc === true
      this.dbOpts = opts
      var os = this
      this.userId = null
-      var resolve
-      this.userIdPromise = new Promise(function (r) {
-        resolve = r
+      var resolve_
+      this.userIdPromise = new Promise(function (resolve) {
+        resolve_ = resolve
      })
-      this.userIdPromise.resolve = resolve
+      this.userIdPromise.resolve = resolve_
      // whether to broadcast all applied operations (insert & delete hook)
      this.forwardAppliedOperations = false
      // E.g. this.listenersById[id] : Array<Listener>
@@ -71,7 +72,7 @@ module.exports = function (Y /* :any */) {
      this.waitingTransactions = []
      this.transactionInProgress = false
      this.transactionIsFlushed = false
-      if (typeof YConcurrency_TestingMode !== 'undefined') {
+      if (typeof YConcurrencyTestingMode !== 'undefined') {
        this.executeOrder = []
      }
      this.gc1 = [] // first stage
@@ -79,7 +80,7 @@ module.exports = function (Y /* :any */) {

      function garbageCollect () {
        return os.whenTransactionsFinished().then(function () {
-          if (os.gc1.length > 0 || os.gc2.length > 0) {
+          if (os.gcTimeout > 0 && (os.gc1.length > 0 || os.gc2.length > 0)) {
            if (!os.y.connector.isSynced) {
              console.warn('gc should be empty when not synced!')
            }
@@ -88,7 +89,7 @@ module.exports = function (Y /* :any */) {
                if (os.y.connector != null && os.y.connector.isSynced) {
                  for (var i = 0; i < os.gc2.length; i++) {
                    var oid = os.gc2[i]
-                    yield* this.garbageCollectOperation(oid)
+                    yield * this.garbageCollectOperation(oid)
                  }
                  os.gc2 = os.gc1
                  os.gc1 = []
@@ -117,9 +118,9 @@ module.exports = function (Y /* :any */) {
      this.startRepairCheck()
    }
    startGarbageCollector () {
-      this.gc = this.dbOpts.gc == null || this.dbOpts.gc
+      this.gc = this.dbOpts.gc
      if (this.gc) {
-        this.gcTimeout = !this.dbOpts.gcTimeout ? 50000 : this.dbOpts.gcTimeout
+        this.gcTimeout = !this.dbOpts.gcTimeout ? 100000 : this.dbOpts.gcTimeout
      } else {
        this.gcTimeout = -1
      }
@@ -177,7 +178,7 @@ module.exports = function (Y /* :any */) {
      })
    }
    addToDebug () {
-      if (typeof YConcurrency_TestingMode !== 'undefined') {
+      if (typeof YConcurrencyTestingMode !== 'undefined') {
        var command /* :string */ = Array.prototype.map.call(arguments, function (s) {
          if (typeof s === 'string') {
            return s
@@ -201,10 +202,10 @@ module.exports = function (Y /* :any */) {
          self.gc1 = []
          self.gc2 = []
          for (var i = 0; i < ungc.length; i++) {
-            var op = yield* this.getOperation(ungc[i])
+            var op = yield * this.getOperation(ungc[i])
            if (op != null) {
              delete op.gc
-              yield* this.setOperation(op)
+              yield * this.setOperation(op)
            }
          }
          resolve()
@@ -234,12 +235,12 @@ module.exports = function (Y /* :any */) {
        if (left != null && left.deleted === true) {
          gc = true
        } else if (op.content != null && op.content.length > 1) {
-          op = yield* this.getInsertionCleanStart([op.id[0], op.id[1] + 1])
+          op = yield * this.getInsertionCleanStart([op.id[0], op.id[1] + 1])
          gc = true
        }
        if (gc) {
          op.gc = true
-          yield* this.setOperation(op)
+          yield * this.setOperation(op)
          this.store.queueGarbageCollector(op.id)
          return true
        }
@@ -265,7 +266,7 @@ module.exports = function (Y /* :any */) {
      }
    }
    * destroy () {
-      clearInterval(this.gcInterval)
+      clearTimeout(this.gcInterval)
      this.gcInterval = null
      this.stopRepairCheck()
    }
@@ -275,7 +276,7 @@ module.exports = function (Y /* :any */) {
        var self = this
        self.requestTransaction(function * () {
          self.userId = userId
-          var state = yield* this.getState(userId)
+          var state = yield * this.getState(userId)
          self.opClock = state.clock
          self.userIdPromise.resolve(userId)
        })
@@ -363,7 +364,7 @@ module.exports = function (Y /* :any */) {

        for (let key = 0; key < exeNow.length; key++) {
          let o = exeNow[key].op
-          yield* store.tryExecute.call(this, o)
+          yield * store.tryExecute.call(this, o)
        }

        for (var sid in ls) {
@@ -371,9 +372,9 @@ module.exports = function (Y /* :any */) {
          var id = JSON.parse(sid)
          var op
          if (typeof id[1] === 'string') {
-            op = yield* this.getOperation(id)
+            op = yield * this.getOperation(id)
          } else {
-            op = yield* this.getInsertion(id)
+            op = yield * this.getInsertion(id)
          }
          if (op == null) {
            store.listenersById[sid] = l
@@ -382,7 +383,7 @@ module.exports = function (Y /* :any */) {
              let listener = l[i]
              let o = listener.op
              if (--listener.missing === 0) {
-                yield* store.tryExecute.call(this, o)
+                yield * store.tryExecute.call(this, o)
              }
            }
          }
@@ -400,14 +401,14 @@ module.exports = function (Y /* :any */) {
    whenOperationsExist: any;
    */
    * tryExecute (op) {
-      this.store.addToDebug('yield* this.store.tryExecute.call(this, ', JSON.stringify(op), ')')
+      this.store.addToDebug('yield * this.store.tryExecute.call(this, ', JSON.stringify(op), ')')
      if (op.struct === 'Delete') {
-        yield* Y.Struct.Delete.execute.call(this, op)
+        yield * Y.Struct.Delete.execute.call(this, op)
        // this is now called in Transaction.deleteOperation!
-        // yield* this.store.operationAdded(this, op)
+        // yield * this.store.operationAdded(this, op)
      } else {
        // check if this op was defined
-        var defined = yield* this.getInsertion(op.id)
+        var defined = yield * this.getInsertion(op.id)
        while (defined != null && defined.content != null) {
          // check if this op has a longer content in the case it is defined
          if (defined.id[1] + defined.content.length < op.id[1] + op.content.length) {
@@ -416,23 +417,23 @@ module.exports = function (Y /* :any */) {
            op.id = [op.id[0], op.id[1] + overlapSize]
            op.left = Y.utils.getLastId(defined)
            op.origin = op.left
-            defined = yield* this.getOperation(op.id) // getOperation suffices here
+            defined = yield * this.getOperation(op.id) // getOperation suffices here
          } else {
            break
          }
        }
        if (defined == null) {
          var opid = op.id
-          var isGarbageCollected = yield* this.isGarbageCollected(opid)
+          var isGarbageCollected = yield * this.isGarbageCollected(opid)
          if (!isGarbageCollected) {
            // TODO: reduce number of get / put calls for op ..
-            yield* Y.Struct[op.struct].execute.call(this, op)
-            yield* this.addOperation(op)
-            yield* this.store.operationAdded(this, op)
+            yield * Y.Struct[op.struct].execute.call(this, op)
+            yield * this.addOperation(op)
+            yield * this.store.operationAdded(this, op)
            // operationAdded can change op..
-            op = yield* this.getOperation(opid)
+            op = yield * this.getOperation(opid)
            // if insertion, try to combine with left
-            yield* this.tryCombineWithLeft(op)
+            yield * this.tryCombineWithLeft(op)
          }
        }
      }
@@ -453,11 +454,11 @@ module.exports = function (Y /* :any */) {
      if (op.struct === 'Delete') {
        var type = this.initializedTypes[JSON.stringify(op.targetParent)]
        if (type != null) {
-          yield* type._changed(transaction, op)
+          yield * type._changed(transaction, op)
        }
      } else {
        // increase SS
-        yield* transaction.updateState(op.id[0])
+        yield * transaction.updateState(op.id[0])
        var opLen = op.content != null ? op.content.length : 1
        for (let i = 0; i < opLen; i++) {
          // notify whenOperation listeners (by id)
@@ -477,9 +478,9 @@ module.exports = function (Y /* :any */) {

        // if parent is deleted, mark as gc'd and return
        if (op.parent != null) {
-          var parentIsDeleted = yield* transaction.isDeleted(op.parent)
+          var parentIsDeleted = yield * transaction.isDeleted(op.parent)
          if (parentIsDeleted) {
-            yield* transaction.deleteList(op.id)
+            yield * transaction.deleteList(op.id)
            return
          }
        }
@@ -487,7 +488,7 @@ module.exports = function (Y /* :any */) {
        // notify parent, if it was instanciated as a custom type
        if (t != null) {
          let o = Y.utils.copyOperation(op)
-          yield* t._changed(transaction, o)
+          yield * t._changed(transaction, o)
        }
        if (!op.deleted) {
          // Delete if DS says this is actually deleted
@@ -496,13 +497,13 @@ module.exports = function (Y /* :any */) {
            // TODO: !! console.log('TODO: change this before commiting')
          for (let i = 0; i < len; i++) {
            var id = [startId[0], startId[1] + i]
-            var opIsDeleted = yield* transaction.isDeleted(id)
+            var opIsDeleted = yield * transaction.isDeleted(id)
            if (opIsDeleted) {
              var delop = {
                struct: 'Delete',
                target: id
              }
-              yield* this.tryExecute.call(transaction, delop)
+              yield * this.tryExecute.call(transaction, delop)
            }
          }
        }
@@ -511,12 +512,12 @@ module.exports = function (Y /* :any */) {
    whenTransactionsFinished () {
      if (this.transactionInProgress) {
        if (this.transactionsFinished == null) {
-          var resolve
-          var promise = new Promise(function (r) {
-            resolve = r
+          var resolve_
+          var promise = new Promise(function (resolve) {
+            resolve_ = resolve
          })
          this.transactionsFinished = {
-            resolve: resolve,
+            resolve: resolve_,
            promise: promise
          }
        }
@@ -540,7 +541,7 @@ module.exports = function (Y /* :any */) {
        } else {
          this.transactionIsFlushed = true
          return function * () {
-            yield* this.flush()
+            yield * this.flush()
          }
        }
      } else {
@@ -571,9 +572,9 @@ module.exports = function (Y /* :any */) {
      var sid = JSON.stringify(id)
      var t = this.store.initializedTypes[sid]
      if (t == null) {
-        var op/* :MapStruct | ListStruct */ = yield* this.getOperation(id)
+        var op/* :MapStruct | ListStruct */ = yield * this.getOperation(id)
        if (op != null) {
-          t = yield* Y[op.type].typeDefinition.initType.call(this, this.store, op, args)
+          t = yield * Y[op.type].typeDefinition.initType.call(this, this.store, op, args)
          this.store.initializedTypes[sid] = t
        }
      }
@@ -590,9 +591,9 @@ module.exports = function (Y /* :any */) {

      this.requestTransaction(function * () {
        if (op.id[0] === '_') {
-          yield* this.setOperation(op)
+          yield * this.setOperation(op)
        } else {
-          yield* this.applyCreatedOperations([op])
+          yield * this.applyCreatedOperations([op])
        }
      })
      var t = Y[op.type].typeDefinition.createType(this, op, typedefinition[1])
--- a/src/Database.spec.js
+++ b/src/Database.spec.js
@@ -17,141 +17,141 @@ for (let database of databases) {
        })
        afterEach(function (done) {
          store.requestTransaction(function * () {
-            yield* this.store.destroy()
+            yield * this.store.destroy()
            done()
          })
        })
        it('Deleted operation is deleted', async(function * (done) {
          store.requestTransaction(function * () {
-            yield* this.markDeleted(['u1', 10], 1)
-            expect(yield* this.isDeleted(['u1', 10])).toBeTruthy()
-            expect(yield* this.getDeleteSet()).toEqual({'u1': [[10, 1, false]]})
+            yield * this.markDeleted(['u1', 10], 1)
+            expect(yield * this.isDeleted(['u1', 10])).toBeTruthy()
+            expect(yield * this.getDeleteSet()).toEqual({'u1': [[10, 1, false]]})
            done()
          })
        }))
        it('Deleted operation extends other deleted operation', async(function * (done) {
          store.requestTransaction(function * () {
-            yield* this.markDeleted(['u1', 10], 1)
-            yield* this.markDeleted(['u1', 11], 1)
-            expect(yield* this.isDeleted(['u1', 10])).toBeTruthy()
-            expect(yield* this.isDeleted(['u1', 11])).toBeTruthy()
-            expect(yield* this.getDeleteSet()).toEqual({'u1': [[10, 2, false]]})
+            yield * this.markDeleted(['u1', 10], 1)
+            yield * this.markDeleted(['u1', 11], 1)
+            expect(yield * this.isDeleted(['u1', 10])).toBeTruthy()
+            expect(yield * this.isDeleted(['u1', 11])).toBeTruthy()
+            expect(yield * this.getDeleteSet()).toEqual({'u1': [[10, 2, false]]})
            done()
          })
        }))
        it('Deleted operation extends other deleted operation', async(function * (done) {
          store.requestTransaction(function * () {
-            yield* this.markDeleted(['0', 3], 1)
-            yield* this.markDeleted(['0', 4], 1)
-            yield* this.markDeleted(['0', 2], 1)
-            expect(yield* this.getDeleteSet()).toEqual({'0': [[2, 3, false]]})
+            yield * this.markDeleted(['0', 3], 1)
+            yield * this.markDeleted(['0', 4], 1)
+            yield * this.markDeleted(['0', 2], 1)
+            expect(yield * this.getDeleteSet()).toEqual({'0': [[2, 3, false]]})
            done()
          })
        }))
        it('Debug #1', async(function * (done) {
          store.requestTransaction(function * () {
-            yield* this.markDeleted(['166', 0], 1)
-            yield* this.markDeleted(['166', 2], 1)
-            yield* this.markDeleted(['166', 0], 1)
-            yield* this.markDeleted(['166', 2], 1)
-            yield* this.markGarbageCollected(['166', 2], 1)
-            yield* this.markDeleted(['166', 1], 1)
-            yield* this.markDeleted(['166', 3], 1)
-            yield* this.markGarbageCollected(['166', 3], 1)
-            yield* this.markDeleted(['166', 0], 1)
-            expect(yield* this.getDeleteSet()).toEqual({'166': [[0, 2, false], [2, 2, true]]})
+            yield * this.markDeleted(['166', 0], 1)
+            yield * this.markDeleted(['166', 2], 1)
+            yield * this.markDeleted(['166', 0], 1)
+            yield * this.markDeleted(['166', 2], 1)
+            yield * this.markGarbageCollected(['166', 2], 1)
+            yield * this.markDeleted(['166', 1], 1)
+            yield * this.markDeleted(['166', 3], 1)
+            yield * this.markGarbageCollected(['166', 3], 1)
+            yield * this.markDeleted(['166', 0], 1)
+            expect(yield * this.getDeleteSet()).toEqual({'166': [[0, 2, false], [2, 2, true]]})
            done()
          })
        }))
        it('Debug #2', async(function * (done) {
          store.requestTransaction(function * () {
-            yield* this.markDeleted(['293', 0], 1)
-            yield* this.markDeleted(['291', 2], 1)
-            yield* this.markDeleted(['291', 2], 1)
-            yield* this.markGarbageCollected(['293', 0], 1)
-            yield* this.markDeleted(['293', 1], 1)
-            yield* this.markGarbageCollected(['291', 2], 1)
-            expect(yield* this.getDeleteSet()).toEqual({'291': [[2, 1, true]], '293': [[0, 1, true], [1, 1, false]]})
+            yield * this.markDeleted(['293', 0], 1)
+            yield * this.markDeleted(['291', 2], 1)
+            yield * this.markDeleted(['291', 2], 1)
+            yield * this.markGarbageCollected(['293', 0], 1)
+            yield * this.markDeleted(['293', 1], 1)
+            yield * this.markGarbageCollected(['291', 2], 1)
+            expect(yield * this.getDeleteSet()).toEqual({'291': [[2, 1, true]], '293': [[0, 1, true], [1, 1, false]]})
            done()
          })
        }))
        it('Debug #3', async(function * (done) {
          store.requestTransaction(function * () {
-            yield* this.markDeleted(['581', 0], 1)
-            yield* this.markDeleted(['581', 1], 1)
-            yield* this.markDeleted(['580', 0], 1)
-            yield* this.markDeleted(['580', 0], 1)
-            yield* this.markGarbageCollected(['581', 0], 1)
-            yield* this.markDeleted(['581', 2], 1)
-            yield* this.markDeleted(['580', 1], 1)
-            yield* this.markDeleted(['580', 2], 1)
-            yield* this.markDeleted(['580', 1], 1)
-            yield* this.markDeleted(['580', 2], 1)
-            yield* this.markGarbageCollected(['581', 2], 1)
-            yield* this.markGarbageCollected(['581', 1], 1)
-            yield* this.markGarbageCollected(['580', 1], 1)
-            expect(yield* this.getDeleteSet()).toEqual({'580': [[0, 1, false], [1, 1, true], [2, 1, false]], '581': [[0, 3, true]]})
+            yield * this.markDeleted(['581', 0], 1)
+            yield * this.markDeleted(['581', 1], 1)
+            yield * this.markDeleted(['580', 0], 1)
+            yield * this.markDeleted(['580', 0], 1)
+            yield * this.markGarbageCollected(['581', 0], 1)
+            yield * this.markDeleted(['581', 2], 1)
+            yield * this.markDeleted(['580', 1], 1)
+            yield * this.markDeleted(['580', 2], 1)
+            yield * this.markDeleted(['580', 1], 1)
+            yield * this.markDeleted(['580', 2], 1)
+            yield * this.markGarbageCollected(['581', 2], 1)
+            yield * this.markGarbageCollected(['581', 1], 1)
+            yield * this.markGarbageCollected(['580', 1], 1)
+            expect(yield * this.getDeleteSet()).toEqual({'580': [[0, 1, false], [1, 1, true], [2, 1, false]], '581': [[0, 3, true]]})
            done()
          })
        }))
        it('Debug #4', async(function * (done) {
          store.requestTransaction(function * () {
-            yield* this.markDeleted(['544', 0], 1)
-            yield* this.markDeleted(['543', 2], 1)
-            yield* this.markDeleted(['544', 0], 1)
-            yield* this.markDeleted(['543', 2], 1)
-            yield* this.markGarbageCollected(['544', 0], 1)
-            yield* this.markDeleted(['545', 1], 1)
-            yield* this.markDeleted(['543', 4], 1)
-            yield* this.markDeleted(['543', 3], 1)
-            yield* this.markDeleted(['544', 1], 1)
-            yield* this.markDeleted(['544', 2], 1)
-            yield* this.markDeleted(['544', 1], 1)
-            yield* this.markDeleted(['544', 2], 1)
-            yield* this.markGarbageCollected(['543', 2], 1)
-            yield* this.markGarbageCollected(['543', 4], 1)
-            yield* this.markGarbageCollected(['544', 2], 1)
-            yield* this.markGarbageCollected(['543', 3], 1)
-            expect(yield* this.getDeleteSet()).toEqual({'543': [[2, 3, true]], '544': [[0, 1, true], [1, 1, false], [2, 1, true]], '545': [[1, 1, false]]})
+            yield * this.markDeleted(['544', 0], 1)
+            yield * this.markDeleted(['543', 2], 1)
+            yield * this.markDeleted(['544', 0], 1)
+            yield * this.markDeleted(['543', 2], 1)
+            yield * this.markGarbageCollected(['544', 0], 1)
+            yield * this.markDeleted(['545', 1], 1)
+            yield * this.markDeleted(['543', 4], 1)
+            yield * this.markDeleted(['543', 3], 1)
+            yield * this.markDeleted(['544', 1], 1)
+            yield * this.markDeleted(['544', 2], 1)
+            yield * this.markDeleted(['544', 1], 1)
+            yield * this.markDeleted(['544', 2], 1)
+            yield * this.markGarbageCollected(['543', 2], 1)
+            yield * this.markGarbageCollected(['543', 4], 1)
+            yield * this.markGarbageCollected(['544', 2], 1)
+            yield * this.markGarbageCollected(['543', 3], 1)
+            expect(yield * this.getDeleteSet()).toEqual({'543': [[2, 3, true]], '544': [[0, 1, true], [1, 1, false], [2, 1, true]], '545': [[1, 1, false]]})
            done()
          })
        }))
        it('Debug #5', async(function * (done) {
          store.requestTransaction(function * () {
-            yield* this.applyDeleteSet({'16': [[1, 2, false]], '17': [[0, 1, true], [1, 3, false]]})
-            expect(yield* this.getDeleteSet()).toEqual({'16': [[1, 2, false]], '17': [[0, 1, true], [1, 3, false]]})
-            yield* this.applyDeleteSet({'16': [[1, 2, false]], '17': [[0, 4, true]]})
-            expect(yield* this.getDeleteSet()).toEqual({'16': [[1, 2, false]], '17': [[0, 4, true]]})
+            yield * this.applyDeleteSet({'16': [[1, 2, false]], '17': [[0, 1, true], [1, 3, false]]})
+            expect(yield * this.getDeleteSet()).toEqual({'16': [[1, 2, false]], '17': [[0, 1, true], [1, 3, false]]})
+            yield * this.applyDeleteSet({'16': [[1, 2, false]], '17': [[0, 4, true]]})
+            expect(yield * this.getDeleteSet()).toEqual({'16': [[1, 2, false]], '17': [[0, 4, true]]})
            done()
          })
        }))
        it('Debug #6', async(function * (done) {
          store.requestTransaction(function * () {
-            yield* this.applyDeleteSet({'40': [[0, 3, false]]})
-            expect(yield* this.getDeleteSet()).toEqual({'40': [[0, 3, false]]})
-            yield* this.applyDeleteSet({'39': [[2, 2, false]], '40': [[0, 1, true], [1, 2, false]], '41': [[2, 1, false]]})
-            expect(yield* this.getDeleteSet()).toEqual({'39': [[2, 2, false]], '40': [[0, 1, true], [1, 2, false]], '41': [[2, 1, false]]})
+            yield * this.applyDeleteSet({'40': [[0, 3, false]]})
+            expect(yield * this.getDeleteSet()).toEqual({'40': [[0, 3, false]]})
+            yield * this.applyDeleteSet({'39': [[2, 2, false]], '40': [[0, 1, true], [1, 2, false]], '41': [[2, 1, false]]})
+            expect(yield * this.getDeleteSet()).toEqual({'39': [[2, 2, false]], '40': [[0, 1, true], [1, 2, false]], '41': [[2, 1, false]]})
            done()
          })
        }))
        it('Debug #7', async(function * (done) {
          store.requestTransaction(function * () {
-            yield* this.markDeleted(['9', 2], 1)
-            yield* this.markDeleted(['11', 2], 1)
-            yield* this.markDeleted(['11', 4], 1)
-            yield* this.markDeleted(['11', 1], 1)
-            yield* this.markDeleted(['9', 4], 1)
-            yield* this.markDeleted(['10', 0], 1)
-            yield* this.markGarbageCollected(['11', 2], 1)
-            yield* this.markDeleted(['11', 2], 1)
-            yield* this.markGarbageCollected(['11', 3], 1)
-            yield* this.markDeleted(['11', 3], 1)
-            yield* this.markDeleted(['11', 3], 1)
-            yield* this.markDeleted(['9', 4], 1)
-            yield* this.markDeleted(['10', 0], 1)
-            yield* this.markGarbageCollected(['11', 1], 1)
-            yield* this.markDeleted(['11', 1], 1)
-            expect(yield* this.getDeleteSet()).toEqual({'9': [[2, 1, false], [4, 1, false]], '10': [[0, 1, false]], '11': [[1, 3, true], [4, 1, false]]})
+            yield * this.markDeleted(['9', 2], 1)
+            yield * this.markDeleted(['11', 2], 1)
+            yield * this.markDeleted(['11', 4], 1)
+            yield * this.markDeleted(['11', 1], 1)
+            yield * this.markDeleted(['9', 4], 1)
+            yield * this.markDeleted(['10', 0], 1)
+            yield * this.markGarbageCollected(['11', 2], 1)
+            yield * this.markDeleted(['11', 2], 1)
+            yield * this.markGarbageCollected(['11', 3], 1)
+            yield * this.markDeleted(['11', 3], 1)
+            yield * this.markDeleted(['11', 3], 1)
+            yield * this.markDeleted(['9', 4], 1)
+            yield * this.markDeleted(['10', 0], 1)
+            yield * this.markGarbageCollected(['11', 1], 1)
+            yield * this.markDeleted(['11', 1], 1)
+            expect(yield * this.getDeleteSet()).toEqual({'9': [[2, 1, false], [4, 1, false]], '10': [[0, 1, false]], '11': [[1, 3, true], [4, 1, false]]})
            done()
          })
        }))
@@ -167,54 +167,54 @@ for (let database of databases) {
        })
        afterEach(function (done) {
          store.requestTransaction(function * () {
-            yield* this.store.destroy()
+            yield * this.store.destroy()
            done()
          })
        })
        it('debug #1', function (done) {
          store.requestTransaction(function * () {
-            yield* this.os.put({id: [2]})
-            yield* this.os.put({id: [0]})
-            yield* this.os.delete([2])
-            yield* this.os.put({id: [1]})
-            expect(yield* this.os.find([0])).toBeTruthy()
-            expect(yield* this.os.find([1])).toBeTruthy()
-            expect(yield* this.os.find([2])).toBeFalsy()
+            yield * this.os.put({id: [2]})
+            yield * this.os.put({id: [0]})
+            yield * this.os.delete([2])
+            yield * this.os.put({id: [1]})
+            expect(yield * this.os.find([0])).toBeTruthy()
+            expect(yield * this.os.find([1])).toBeTruthy()
+            expect(yield * this.os.find([2])).toBeFalsy()
            done()
          })
        })
        it('can add&retrieve 5 elements', function (done) {
          store.requestTransaction(function * () {
-            yield* this.os.put({val: 'four', id: [4]})
-            yield* this.os.put({val: 'one', id: [1]})
-            yield* this.os.put({val: 'three', id: [3]})
-            yield* this.os.put({val: 'two', id: [2]})
-            yield* this.os.put({val: 'five', id: [5]})
-            expect((yield* this.os.find([1])).val).toEqual('one')
-            expect((yield* this.os.find([2])).val).toEqual('two')
-            expect((yield* this.os.find([3])).val).toEqual('three')
-            expect((yield* this.os.find([4])).val).toEqual('four')
-            expect((yield* this.os.find([5])).val).toEqual('five')
+            yield * this.os.put({val: 'four', id: [4]})
+            yield * this.os.put({val: 'one', id: [1]})
+            yield * this.os.put({val: 'three', id: [3]})
+            yield * this.os.put({val: 'two', id: [2]})
+            yield * this.os.put({val: 'five', id: [5]})
+            expect((yield * this.os.find([1])).val).toEqual('one')
+            expect((yield * this.os.find([2])).val).toEqual('two')
+            expect((yield * this.os.find([3])).val).toEqual('three')
+            expect((yield * this.os.find([4])).val).toEqual('four')
+            expect((yield * this.os.find([5])).val).toEqual('five')
            done()
          })
        })
        it('5 elements do not exist anymore after deleting them', function (done) {
          store.requestTransaction(function * () {
-            yield* this.os.put({val: 'four', id: [4]})
-            yield* this.os.put({val: 'one', id: [1]})
-            yield* this.os.put({val: 'three', id: [3]})
-            yield* this.os.put({val: 'two', id: [2]})
-            yield* this.os.put({val: 'five', id: [5]})
-            yield* this.os.delete([4])
-            expect(yield* this.os.find([4])).not.toBeTruthy()
-            yield* this.os.delete([3])
-            expect(yield* this.os.find([3])).not.toBeTruthy()
-            yield* this.os.delete([2])
-            expect(yield* this.os.find([2])).not.toBeTruthy()
-            yield* this.os.delete([1])
-            expect(yield* this.os.find([1])).not.toBeTruthy()
-            yield* this.os.delete([5])
-            expect(yield* this.os.find([5])).not.toBeTruthy()
+            yield * this.os.put({val: 'four', id: [4]})
+            yield * this.os.put({val: 'one', id: [1]})
+            yield * this.os.put({val: 'three', id: [3]})
+            yield * this.os.put({val: 'two', id: [2]})
+            yield * this.os.put({val: 'five', id: [5]})
+            yield * this.os.delete([4])
+            expect(yield * this.os.find([4])).not.toBeTruthy()
+            yield * this.os.delete([3])
+            expect(yield * this.os.find([3])).not.toBeTruthy()
+            yield * this.os.delete([2])
+            expect(yield * this.os.find([2])).not.toBeTruthy()
+            yield * this.os.delete([1])
+            expect(yield * this.os.find([1])).not.toBeTruthy()
+            yield * this.os.delete([5])
+            expect(yield * this.os.find([5])).not.toBeTruthy()
            done()
          })
        })
@@ -232,9 +232,9 @@ for (let database of databases) {
              var r = Math.random()
              if (r < 0.8) {
                var obj = [Math.floor(Math.random() * numberOfOSTests * 10000)]
-                if (!(yield* this.os.find(obj))) {
+                if (!(yield * this.os.find(obj))) {
                  elements.push(obj)
-                  yield* this.os.put({id: obj})
+                  yield * this.os.put({id: obj})
                }
              } else if (elements.length > 0) {
                var elemid = Math.floor(Math.random() * elements.length)
@@ -242,7 +242,7 @@ for (let database of databases) {
                elements = elements.filter(function (e) {
                  return !Y.utils.compareIds(e, elem)
                })
-                yield* this.os.delete(elem)
+                yield * this.os.delete(elem)
              }
            }
            done()
@@ -250,14 +250,14 @@ for (let database of databases) {
        })
        afterAll(function (done) {
          store.requestTransaction(function * () {
-            yield* this.store.destroy()
+            yield * this.store.destroy()
            done()
          })
        })
        it('can find every object', function (done) {
          store.requestTransaction(function * () {
            for (var id of elements) {
-              expect((yield* this.os.find(id)).id).toEqual(id)
+              expect((yield * this.os.find(id)).id).toEqual(id)
            }
            done()
          })
@@ -266,7 +266,7 @@ for (let database of databases) {
        it('can find every object with lower bound search', function (done) {
          store.requestTransaction(function * () {
            for (var id of elements) {
-              var e = yield* this.os.findWithLowerBound(id)
+              var e = yield * this.os.findWithLowerBound(id)
              expect(e.id).toEqual(id)
            }
            done()
@@ -281,7 +281,7 @@ for (let database of databases) {

          var actualResults = 0
          store.requestTransaction(function * () {
-            yield* this.os.iterate(this, lowerBound, null, function * (val) {
+            yield * this.os.iterate(this, lowerBound, null, function * (val) {
              expect(val).toBeDefined()
              actualResults++
            })
@@ -297,7 +297,7 @@ for (let database of databases) {
          }).length
          var actualResults = 0
          store.requestTransaction(function * () {
-            yield* this.os.iterate(this, lowerBound, null, function * (val) {
+            yield * this.os.iterate(this, lowerBound, null, function * (val) {
              expect(val).toBeDefined()
              actualResults++
            })
@@ -314,7 +314,7 @@ for (let database of databases) {

          var actualResults = 0
          store.requestTransaction(function * () {
-            yield* this.os.iterate(this, null, upperBound, function * (val) {
+            yield * this.os.iterate(this, null, upperBound, function * (val) {
              expect(val).toBeDefined()
              actualResults++
            })
@@ -340,7 +340,7 @@ for (let database of databases) {
          }).length
          var actualResults = 0
          store.requestTransaction(function * () {
-            yield* this.os.iterate(this, lowerBound, upperBound, function * (val) {
+            yield * this.os.iterate(this, lowerBound, upperBound, function * (val) {
              expect(val).toBeDefined()
              actualResults++
            })
--- a/src/SpecHelper.js
+++ b/src/SpecHelper.js
@@ -46,7 +46,7 @@ g.setRandomSeed = function setRandomSeed (seed) {

 g.generateRandomSeed()

-g.YConcurrency_TestingMode = true
+g.YConcurrencyTestingMode = true

 jasmine.DEFAULT_TIMEOUT_INTERVAL = 200000

@@ -168,7 +168,7 @@ function fixAwaitingInType (type) {
      type.os.requestTransaction(function * () {
        if (type.eventHandler.awaiting > 0 && type.eventHandler._debuggingAwaiting === true) {
          type.eventHandler._debuggingAwaiting = false
-          yield* type.eventHandler.awaitOps(this, function * () { /* mock function */ })
+          yield * type.eventHandler.awaitOps(this, function * () { /* mock function */ })
        }
        wait(50).then(type.os.whenTransactionsFinished()).then(wait(50)).then(resolve)
      })
@@ -178,13 +178,13 @@ function fixAwaitingInType (type) {
 g.fixAwaitingInType = fixAwaitingInType

 g.applyRandomTransactionsNoGCNoDisconnect = async(function * applyRandomTransactions (users, objects, transactions, numberOfTransactions) {
-  yield* applyTransactions(1, numberOfTransactions, objects, users, transactions, true)
+  yield * applyTransactions(1, numberOfTransactions, objects, users, transactions, true)
  yield Y.utils.globalRoom.flushAll()
  yield Promise.all(objects.map(fixAwaitingInType))
 })

 g.applyRandomTransactionsAllRejoinNoGC = async(function * applyRandomTransactions (users, objects, transactions, numberOfTransactions) {
-  yield* applyTransactions(1, numberOfTransactions, objects, users, transactions)
+  yield * applyTransactions(1, numberOfTransactions, objects, users, transactions)
  yield Promise.all(objects.map(fixAwaitingInType))
  yield Y.utils.globalRoom.flushAll()
  yield Promise.all(objects.map(fixAwaitingInType))
@@ -200,7 +200,7 @@ g.applyRandomTransactionsAllRejoinNoGC = async(function * applyRandomTransaction
 })

 g.applyRandomTransactionsWithGC = async(function * applyRandomTransactions (users, objects, transactions, numberOfTransactions) {
-  yield* applyTransactions(1, numberOfTransactions, objects, users.slice(1), transactions)
+  yield * applyTransactions(1, numberOfTransactions, objects, users.slice(1), transactions)
  yield Y.utils.globalRoom.flushAll()
  yield Promise.all(objects.map(fixAwaitingInType))
  for (var u in users) {
@@ -242,18 +242,18 @@ g.compareAllUsers = async(function * compareAllUsers (users) {

  // t1 and t2 basically do the same. They define t[1,2], ds[1,2], and allDels[1,2]
  function * t1 () {
-    s1 = yield* this.getStateSet()
-    ds1 = yield* this.getDeleteSet()
+    s1 = yield * this.getStateSet()
+    ds1 = yield * this.getDeleteSet()
    allDels1 = []
-    yield* this.ds.iterate(this, null, null, function * (d) {
+    yield * this.ds.iterate(this, null, null, function * (d) {
      allDels1.push(d)
    })
  }
  function * t2 () {
-    s2 = yield* this.getStateSet()
-    ds2 = yield* this.getDeleteSet()
+    s2 = yield * this.getStateSet()
+    ds2 = yield * this.getDeleteSet()
    allDels2 = []
-    yield* this.ds.iterate(this, null, null, function * (d) {
+    yield * this.ds.iterate(this, null, null, function * (d) {
      allDels2.push(d)
    })
  }
@@ -269,25 +269,25 @@ g.compareAllUsers = async(function * compareAllUsers (users) {
  for (var uid = 0; uid < users.length; uid++) {
    var u = users[uid]
    u.db.requestTransaction(function * () {
-      var sv = yield* this.getStateVector()
+      var sv = yield * this.getStateVector()
      for (var s of sv) {
-        yield* this.updateState(s.user)
+        yield * this.updateState(s.user)
      }
      // compare deleted ops against deleteStore
-      yield* this.os.iterate(this, null, null, function * (o) {
+      yield * this.os.iterate(this, null, null, function * (o) {
        if (o.deleted === true) {
-          expect(yield* this.isDeleted(o.id)).toBeTruthy()
+          expect(yield * this.isDeleted(o.id)).toBeTruthy()
        }
      })
      // compare deleteStore against deleted ops
      var ds = []
-      yield* this.ds.iterate(this, null, null, function * (d) {
+      yield * this.ds.iterate(this, null, null, function * (d) {
        ds.push(d)
      })
      for (var j in ds) {
        var d = ds[j]
        for (var i = 0; i < d.len; i++) {
-          var o = yield* this.getInsertion([d.id[0], d.id[1] + i])
+          var o = yield * this.getInsertion([d.id[0], d.id[1] + i])
          // gc'd or deleted
          if (d.gc) {
            expect(o).toBeFalsy()
@@ -300,8 +300,8 @@ g.compareAllUsers = async(function * compareAllUsers (users) {
    // compare allDels tree
    if (s1 == null) {
      u.db.requestTransaction(function * () {
-        yield* t1.call(this)
-        yield* this.os.iterate(this, null, null, function * (o) {
+        yield * t1.call(this)
+        yield * this.os.iterate(this, null, null, function * (o) {
          o = Y.utils.copyObject(o)
          delete o.origin
          delete o.originOf
@@ -310,9 +310,9 @@ g.compareAllUsers = async(function * compareAllUsers (users) {
      })
    } else {
      u.db.requestTransaction(function * () {
-        yield* t2.call(this)
+        yield * t2.call(this)
        var db2 = []
-        yield* this.os.iterate(this, null, null, function * (o) {
+        yield * this.os.iterate(this, null, null, function * (o) {
          o = Y.utils.copyObject(o)
          delete o.origin
          delete o.originOf
--- a/src/Struct.js
+++ b/src/Struct.js
@@ -19,7 +19,7 @@
 * requiredOps
     - Operations that are required to execute this operation.
 */
-module.exports = function (Y/* :any */) {
+export default function extendStruct (Y) {
  var Struct = {
    /* This is the only operation that is actually not a structure, because
    it is not stored in the OS. This is why it _does not_ have an id
@@ -40,7 +40,7 @@ module.exports = function (Y/* :any */) {
        return [] // [op.target]
      },
      execute: function * (op) {
-        return yield* this.deleteOperation(op.target, op.length || 1)
+        return yield * this.deleteOperation(op.target, op.length || 1)
      }
    },
    Insert: {
@@ -101,13 +101,13 @@ module.exports = function (Y/* :any */) {
          return 0
        } else {
          var d = 0
-          var o = yield* this.getInsertion(op.left)
+          var o = yield * this.getInsertion(op.left)
          while (!Y.utils.matchesId(o, op.origin)) {
            d++
            if (o.left == null) {
              break
            } else {
-              o = yield* this.getInsertion(o.left)
+              o = yield * this.getInsertion(o.left)
            }
          }
          return d
@@ -138,17 +138,17 @@ module.exports = function (Y/* :any */) {
        if (op.origin != null) { // TODO: !== instead of !=
          // we save in origin that op originates in it
          // we need that later when we eventually garbage collect origin (see transaction)
-          var origin = yield* this.getInsertionCleanEnd(op.origin)
+          var origin = yield * this.getInsertionCleanEnd(op.origin)
          if (origin.originOf == null) {
            origin.originOf = []
          }
          origin.originOf.push(op.id)
-          yield* this.setOperation(origin)
+          yield * this.setOperation(origin)
          if (origin.right != null) {
            tryToRemergeLater.push(origin.right)
          }
        }
-        var distanceToOrigin = i = yield* Struct.Insert.getDistanceToOrigin.call(this, op) // most cases: 0 (starts from 0)
+        var distanceToOrigin = i = yield * Struct.Insert.getDistanceToOrigin.call(this, op) // most cases: 0 (starts from 0)

        // now we begin to insert op in the list of insertions..
        var o
@@ -157,29 +157,29 @@ module.exports = function (Y/* :any */) {

        // find o. o is the first conflicting operation
        if (op.left != null) {
-          o = yield* this.getInsertionCleanEnd(op.left)
+          o = yield * this.getInsertionCleanEnd(op.left)
          if (!Y.utils.compareIds(op.left, op.origin) && o.right != null) {
            // only if not added previously
            tryToRemergeLater.push(o.right)
          }
-          o = (o.right == null) ? null : yield* this.getOperation(o.right)
+          o = (o.right == null) ? null : yield * this.getOperation(o.right)
        } else { // left == null
-          parent = yield* this.getOperation(op.parent)
+          parent = yield * this.getOperation(op.parent)
          let startId = op.parentSub ? parent.map[op.parentSub] : parent.start
-          start = startId == null ? null : yield* this.getOperation(startId)
+          start = startId == null ? null : yield * this.getOperation(startId)
          o = start
        }

        // make sure to split op.right if necessary (also add to tryCombineWithLeft)
        if (op.right != null) {
          tryToRemergeLater.push(op.right)
-          yield* this.getInsertionCleanStart(op.right)
+          yield * this.getInsertionCleanStart(op.right)
        }

        // handle conflicts
        while (true) {
          if (o != null && !Y.utils.compareIds(o.id, op.right)) {
-            var oOriginDistance = yield* Struct.Insert.getDistanceToOrigin.call(this, o)
+            var oOriginDistance = yield * Struct.Insert.getDistanceToOrigin.call(this, o)
            if (oOriginDistance === i) {
              // case 1
              if (o.id[0] < op.id[0]) {
@@ -197,7 +197,7 @@ module.exports = function (Y/* :any */) {
            }
            i++
            if (o.right != null) {
-              o = yield* this.getInsertion(o.right)
+              o = yield * this.getInsertion(o.right)
            } else {
              o = null
            }
@@ -210,17 +210,17 @@ module.exports = function (Y/* :any */) {
        var left = null
        var right = null
        if (parent == null) {
-          parent = yield* this.getOperation(op.parent)
+          parent = yield * this.getOperation(op.parent)
        }

        // reconnect left and set right of op
        if (op.left != null) {
-          left = yield* this.getInsertion(op.left)
+          left = yield * this.getInsertion(op.left)
          // link left
          op.right = left.right
          left.right = op.id

-          yield* this.setOperation(left)
+          yield * this.setOperation(left)
        } else {
          // set op.right from parent, if necessary
          op.right = op.parentSub ? parent.map[op.parentSub] || null : parent.start
@@ -228,33 +228,33 @@ module.exports = function (Y/* :any */) {
        // reconnect right
        if (op.right != null) {
          // TODO: wanna connect right too?
-          right = yield* this.getOperation(op.right)
+          right = yield * this.getOperation(op.right)
          right.left = Y.utils.getLastId(op)

          // if right exists, and it is supposed to be gc'd. Remove it from the gc
          if (right.gc != null) {
            if (right.content != null && right.content.length > 1) {
-              right = yield* this.getInsertionCleanEnd(right.id)
+              right = yield * this.getInsertionCleanEnd(right.id)
            }
            this.store.removeFromGarbageCollector(right)
          }
-          yield* this.setOperation(right)
+          yield * this.setOperation(right)
        }

        // update parents .map/start/end properties
        if (op.parentSub != null) {
          if (left == null) {
            parent.map[op.parentSub] = op.id
-            yield* this.setOperation(parent)
+            yield * this.setOperation(parent)
          }
          // is a child of a map struct.
          // Then also make sure that only the most left element is not deleted
          // We do not call the type in this case (this is what the third parameter is for)
          if (op.right != null) {
-            yield* this.deleteOperation(op.right, 1, true)
+            yield * this.deleteOperation(op.right, 1, true)
          }
          if (op.left != null) {
-            yield* this.deleteOperation(op.id, 1, true)
+            yield * this.deleteOperation(op.id, 1, true)
          }
        } else {
          if (right == null || left == null) {
@@ -264,14 +264,14 @@ module.exports = function (Y/* :any */) {
            if (left == null) {
              parent.start = op.id
            }
-            yield* this.setOperation(parent)
+            yield * this.setOperation(parent)
          }
        }

        // try to merge original op.left and op.origin
        for (i = 0; i < tryToRemergeLater.length; i++) {
-          var m = yield* this.getOperation(tryToRemergeLater[i])
-          yield* this.tryCombineWithLeft(m)
+          var m = yield * this.getOperation(tryToRemergeLater[i])
+          yield * this.tryCombineWithLeft(m)
        }
      }
    },
@@ -329,7 +329,7 @@ module.exports = function (Y/* :any */) {
          return null
        }
        var res = null
-        var o = yield* this.getOperation(op.start)
+        var o = yield * this.getOperation(op.start)

        while (true) {
          if (!o.deleted) {
@@ -337,7 +337,7 @@ module.exports = function (Y/* :any */) {
            pos--
          }
          if (pos >= 0 && o.right != null) {
-            o = yield* this.getOperation(o.right)
+            o = yield * this.getOperation(o.right)
          } else {
            break
          }
@@ -348,7 +348,7 @@ module.exports = function (Y/* :any */) {
        o = o.start
        var res = []
        while (o != null) { // TODO: change to != (at least some convention)
-          var operation = yield* this.getOperation(o)
+          var operation = yield * this.getOperation(o)
          if (!operation.deleted) {
            res.push(f(operation))
          }
@@ -398,13 +398,13 @@ module.exports = function (Y/* :any */) {
      get: function * (op, name) {
        var oid = op.map[name]
        if (oid != null) {
-          var res = yield* this.getOperation(oid)
+          var res = yield * this.getOperation(oid)
          if (res == null || res.deleted) {
            return void 0
          } else if (res.opContent == null) {
            return res.content[0]
          } else {
-            return yield* this.getType(res.opContent)
+            return yield * this.getType(res.opContent)
          }
        }
      }
--- a/src/Transaction.js
+++ b/src/Transaction.js
@@ -74,7 +74,7 @@
     - this is called only by `getOperations(startSS)`. It makes an operation
       applyable on a given SS.
 */
-module.exports = function (Y/* :any */) {
+export default function extendTransaction (Y) {
  class TransactionInterface {
    /* ::
    store: Y.AbstractDatabase;
@@ -91,7 +91,7 @@ module.exports = function (Y/* :any */) {
      var send = []
      for (var i = 0; i < ops.length; i++) {
        var op = ops[i]
-        yield* this.store.tryExecute.call(this, op)
+        yield * this.store.tryExecute.call(this, op)
        if (op.id == null || typeof op.id[1] !== 'string') {
          send.push(Y.Struct[op.struct].encode(op))
        }
@@ -104,15 +104,15 @@ module.exports = function (Y/* :any */) {

    * deleteList (start) {
      while (start != null) {
-        start = yield* this.getOperation(start)
+        start = yield * this.getOperation(start)
        if (!start.gc) {
          start.gc = true
          start.deleted = true
-          yield* this.setOperation(start)
+          yield * this.setOperation(start)
          var delLength = start.content != null ? start.content.length : 1
-          yield* this.markDeleted(start.id, delLength)
+          yield * this.markDeleted(start.id, delLength)
          if (start.opContent != null) {
-            yield* this.deleteOperation(start.opContent)
+            yield * this.deleteOperation(start.opContent)
          }
          this.store.queueGarbageCollector(start.id)
        }
@@ -127,10 +127,10 @@ module.exports = function (Y/* :any */) {
      if (length == null) {
        length = 1
      }
-      yield* this.markDeleted(targetId, length)
+      yield * this.markDeleted(targetId, length)
      while (length > 0) {
        var callType = false
-        var target = yield* this.os.findWithUpperBound([targetId[0], targetId[1] + length - 1])
+        var target = yield * this.os.findWithUpperBound([targetId[0], targetId[1] + length - 1])
        var targetLength = target != null && target.content != null ? target.content.length : 1
        if (target == null || target.id[0] !== targetId[0] || target.id[1] + targetLength <= targetId[1]) {
          // does not exist or is not in the range of the deletion
@@ -141,12 +141,12 @@ module.exports = function (Y/* :any */) {
          if (!target.deleted) {
            if (target.id[1] < targetId[1]) {
              // starts to the left of the deletion range
-              target = yield* this.getInsertionCleanStart(targetId)
+              target = yield * this.getInsertionCleanStart(targetId)
              targetLength = target.content.length // must have content property!
            }
            if (target.id[1] + targetLength > targetId[1] + length) {
              // ends to the right of the deletion range
-              target = yield* this.getInsertionCleanEnd([targetId[0], targetId[1] + length - 1])
+              target = yield * this.getInsertionCleanEnd([targetId[0], targetId[1] + length - 1])
              targetLength = target.content.length
            }
          }
@@ -161,35 +161,35 @@ module.exports = function (Y/* :any */) {
            // delete containing lists
            if (target.start != null) {
              // TODO: don't do it like this .. -.-
-              yield* this.deleteList(target.start)
-              // yield* this.deleteList(target.id) -- do not gc itself because this may still get referenced
+              yield * this.deleteList(target.start)
+              // yield * this.deleteList(target.id) -- do not gc itself because this may still get referenced
            }
            if (target.map != null) {
              for (var name in target.map) {
-                yield* this.deleteList(target.map[name])
+                yield * this.deleteList(target.map[name])
              }
              // TODO: here to..  (see above)
-              // yield* this.deleteList(target.id) -- see above
+              // yield * this.deleteList(target.id) -- see above
            }
            if (target.opContent != null) {
-              yield* this.deleteOperation(target.opContent)
+              yield * this.deleteOperation(target.opContent)
              // target.opContent = null
            }
            if (target.requires != null) {
              for (var i = 0; i < target.requires.length; i++) {
-                yield* this.deleteOperation(target.requires[i])
+                yield * this.deleteOperation(target.requires[i])
              }
            }
          }
          var left
          if (target.left != null) {
-            left = yield* this.getInsertion(target.left)
+            left = yield * this.getInsertion(target.left)
          } else {
            left = null
          }

          // set here because it was deleted and/or gc'd
-          yield* this.setOperation(target)
+          yield * this.setOperation(target)

          /*
            Check if it is possible to add right to the gc.
@@ -198,12 +198,12 @@ module.exports = function (Y/* :any */) {
          */
          var right
          if (target.right != null) {
-            right = yield* this.getOperation(target.right)
+            right = yield * this.getOperation(target.right)
          } else {
            right = null
          }
          if (callType && !preventCallType) {
-            yield* this.store.operationAdded(this, {
+            yield * this.store.operationAdded(this, {
              struct: 'Delete',
              target: target.id,
              length: targetLength,
@@ -211,9 +211,9 @@ module.exports = function (Y/* :any */) {
            })
          }
          // need to gc in the end!
-          yield* this.store.addToGarbageCollector.call(this, target, left)
+          yield * this.store.addToGarbageCollector.call(this, target, left)
          if (right != null) {
-            yield* this.store.addToGarbageCollector.call(this, right, target)
+            yield * this.store.addToGarbageCollector.call(this, right, target)
          }
        }
      }
@@ -223,23 +223,23 @@ module.exports = function (Y/* :any */) {
    */
    * markGarbageCollected (id, len) {
      // this.mem.push(["gc", id]);
-      this.store.addToDebug('yield* this.markGarbageCollected(', id, ', ', len, ')')
-      var n = yield* this.markDeleted(id, len)
+      this.store.addToDebug('yield * this.markGarbageCollected(', id, ', ', len, ')')
+      var n = yield * this.markDeleted(id, len)
      if (n.id[1] < id[1] && !n.gc) {
        // un-extend left
        var newlen = n.len - (id[1] - n.id[1])
        n.len -= newlen
-        yield* this.ds.put(n)
+        yield * this.ds.put(n)
        n = {id: id, len: newlen, gc: false}
-        yield* this.ds.put(n)
+        yield * this.ds.put(n)
      }
      // get prev&next before adding a new operation
-      var prev = yield* this.ds.findPrev(id)
-      var next = yield* this.ds.findNext(id)
+      var prev = yield * this.ds.findPrev(id)
+      var next = yield * this.ds.findNext(id)

      if (id[1] + len < n.id[1] + n.len && !n.gc) {
        // un-extend right
-        yield* this.ds.put({id: [id[0], id[1] + len], len: n.len - len, gc: false})
+        yield * this.ds.put({id: [id[0], id[1] + len], len: n.len - len, gc: false})
        n.len = len
      }
      // set gc'd
@@ -251,7 +251,7 @@ module.exports = function (Y/* :any */) {
        Y.utils.compareIds([prev.id[0], prev.id[1] + prev.len], n.id)
      ) {
        prev.len += n.len
-        yield* this.ds.delete(n.id)
+        yield * this.ds.delete(n.id)
        n = prev
        // ds.put n here?
      }
@@ -262,10 +262,10 @@ module.exports = function (Y/* :any */) {
        Y.utils.compareIds([n.id[0], n.id[1] + n.len], next.id)
      ) {
        n.len += next.len
-        yield* this.ds.delete(next.id)
+        yield * this.ds.delete(next.id)
      }
-      yield* this.ds.put(n)
-      yield* this.updateState(n.id[0])
+      yield * this.ds.put(n)
+      yield * this.updateState(n.id[0])
    }
    /*
      Mark an operation as deleted.
@@ -277,7 +277,7 @@ module.exports = function (Y/* :any */) {
        length = 1
      }
      // this.mem.push(["del", id]);
-      var n = yield* this.ds.findWithUpperBound(id)
+      var n = yield * this.ds.findWithUpperBound(id)
      if (n != null && n.id[0] === id[0]) {
        if (n.id[1] <= id[1] && id[1] <= n.id[1] + n.len) {
          // id is in n's range
@@ -291,11 +291,12 @@ module.exports = function (Y/* :any */) {
              if (diff < length) {
                // a partial deletion
                n = {id: [id[0], id[1] + diff], len: length - diff, gc: false}
-                yield* this.ds.put(n)
+                yield * this.ds.put(n)
              } else {
                // already gc'd
-                throw new Error('Cannot happen! (it dit though.. :()')
-                // return n
+                throw new Error(
+                  'DS reached an inconsistent state. Please report this issue!'
+                )
              }
            }
          } else {
@@ -305,15 +306,15 @@ module.exports = function (Y/* :any */) {
        } else {
          // cannot extend left (there is no left!)
          n = {id: id, len: length, gc: false}
-          yield* this.ds.put(n) // TODO: you double-put !!
+          yield * this.ds.put(n) // TODO: you double-put !!
        }
      } else {
        // cannot extend left
        n = {id: id, len: length, gc: false}
-        yield* this.ds.put(n)
+        yield * this.ds.put(n)
      }
      // can extend right?
-      var next = yield* this.ds.findNext(n.id)
+      var next = yield * this.ds.findNext(n.id)
      if (
        next != null &&
        n.id[0] === next.id[0] &&
@@ -329,8 +330,8 @@ module.exports = function (Y/* :any */) {
              // delete the missing range after next
              diff = diff - next.len // missing range after next
              if (diff > 0) {
-                yield* this.ds.put(n) // unneccessary? TODO!
-                yield* this.markDeleted([next.id[0], next.id[1] + next.len], diff)
+                yield * this.ds.put(n) // unneccessary? TODO!
+                yield * this.markDeleted([next.id[0], next.id[1] + next.len], diff)
              }
            }
            break
@@ -339,8 +340,8 @@ module.exports = function (Y/* :any */) {
            if (diff > next.len) {
              // n is even longer than next
              // get next.next, and try to extend it
-              var _next = yield* this.ds.findNext(next.id)
-              yield* this.ds.delete(next.id)
+              var _next = yield * this.ds.findNext(next.id)
+              yield * this.ds.delete(next.id)
              if (_next == null || n.id[0] !== _next.id[0]) {
                break
              } else {
@@ -351,13 +352,13 @@ module.exports = function (Y/* :any */) {
            } else {
              // n just partially overlaps with next. extend n, delete next, and break this loop
              n.len += next.len - diff
-              yield* this.ds.delete(next.id)
+              yield * this.ds.delete(next.id)
              break
            }
          }
        }
      }
-      yield* this.ds.put(n)
+      yield * this.ds.put(n)
      return n
    }
    /*
@@ -366,34 +367,35 @@ module.exports = function (Y/* :any */) {
      operations that can be gc'd and add them to the garbage collector.
    */
    * garbageCollectAfterSync () {
+      // debugger
      if (this.store.gc1.length > 0 || this.store.gc2.length > 0) {
        console.warn('gc should be empty after sync')
      }
      if (!this.store.gc) {
        return
      }
-      yield* this.os.iterate(this, null, null, function * (op) {
+      yield * this.os.iterate(this, null, null, function * (op) {
        if (op.gc) {
          delete op.gc
-          yield* this.setOperation(op)
+          yield * this.setOperation(op)
        }
        if (op.parent != null) {
-          var parentDeleted = yield* this.isDeleted(op.parent)
+          var parentDeleted = yield * this.isDeleted(op.parent)
          if (parentDeleted) {
            op.gc = true
            if (!op.deleted) {
-              yield* this.markDeleted(op.id, op.content != null ? op.content.length : 1)
+              yield * this.markDeleted(op.id, op.content != null ? op.content.length : 1)
              op.deleted = true
              if (op.opContent != null) {
-                yield* this.deleteOperation(op.opContent)
+                yield * this.deleteOperation(op.opContent)
              }
              if (op.requires != null) {
                for (var i = 0; i < op.requires.length; i++) {
-                  yield* this.deleteOperation(op.requires[i])
+                  yield * this.deleteOperation(op.requires[i])
                }
              }
            }
-            yield* this.setOperation(op)
+            yield * this.setOperation(op)
            this.store.gc1.push(op.id) // this is ok becaues its shortly before sync (otherwise use queueGarbageCollector!)
            return
          }
@@ -401,9 +403,9 @@ module.exports = function (Y/* :any */) {
        if (op.deleted) {
          var left = null
          if (op.left != null) {
-            left = yield* this.getInsertion(op.left)
+            left = yield * this.getInsertion(op.left)
          }
-          yield* this.store.addToGarbageCollector.call(this, op, left)
+          yield * this.store.addToGarbageCollector.call(this, op, left)
        }
      })
    }
@@ -417,9 +419,9 @@ module.exports = function (Y/* :any */) {
      * reset origins of all right ops
    */
    * garbageCollectOperation (id) {
-      this.store.addToDebug('yield* this.garbageCollectOperation(', id, ')')
-      var o = yield* this.getOperation(id)
-      yield* this.markGarbageCollected(id, (o != null && o.content != null) ? o.content.length : 1) // always mark gc'd
+      this.store.addToDebug('yield * this.garbageCollectOperation(', id, ')')
+      var o = yield * this.getOperation(id)
+      yield * this.markGarbageCollected(id, (o != null && o.content != null) ? o.content.length : 1) // always mark gc'd
      // if op exists, then clean that mess up..
      if (o != null) {
        var deps = []
@@ -430,45 +432,37 @@ module.exports = function (Y/* :any */) {
          deps = deps.concat(o.requires)
        }
        for (var i = 0; i < deps.length; i++) {
-          var dep = yield* this.getOperation(deps[i])
+          var dep = yield * this.getOperation(deps[i])
          if (dep != null) {
            if (!dep.deleted) {
-              yield* this.deleteOperation(dep.id)
-              dep = yield* this.getOperation(dep.id)
+              yield * this.deleteOperation(dep.id)
+              dep = yield * this.getOperation(dep.id)
            }
            dep.gc = true
-            yield* this.setOperation(dep)
+            yield * this.setOperation(dep)
            this.store.queueGarbageCollector(dep.id)
          } else {
-            yield* this.markGarbageCollected(deps[i], 1)
+            yield * this.markGarbageCollected(deps[i], 1)
          }
        }

        // remove gc'd op from the left op, if it exists
        if (o.left != null) {
-          var left = yield* this.getInsertion(o.left)
+          var left = yield * this.getInsertion(o.left)
          left.right = o.right
-          yield* this.setOperation(left)
+          yield * this.setOperation(left)
        }
        // remove gc'd op from the right op, if it exists
        // also reset origins of right ops
        if (o.right != null) {
-          var right = yield* this.getOperation(o.right)
+          var right = yield * this.getOperation(o.right)
          right.left = o.left
-          yield* this.setOperation(right)
+          yield * this.setOperation(right)

          if (o.originOf != null && o.originOf.length > 0) {
            // find new origin of right ops
-            // origin is the first left deleted operation
+            // origin is the first left operation
            var neworigin = o.left
-            var neworigin_ = null
-            while (neworigin != null) {
-              neworigin_ = yield* this.getInsertion(neworigin)
-              if (neworigin_.deleted) {
-                break
-              }
-              neworigin = neworigin_.left
-            }

            // reset origin of all right ops (except first right - duh!),

@@ -482,7 +476,7 @@ module.exports = function (Y/* :any */) {
            right.origin = neworigin
            // search until you find origin pointer to the left of o
            if (right.right != null) {
-              var i = yield* this.getOperation(right.right)
+              var i = yield * this.getOperation(right.right)
              var ids = [o.id, o.right]
              while (ids.some(function (id) {
                return Y.utils.compareIds(id, i.origin)
@@ -490,14 +484,14 @@ module.exports = function (Y/* :any */) {
                if (Y.utils.compareIds(i.origin, o.id)) {
                  // reset origin of i
                  i.origin = neworigin
-                  yield* this.setOperation(i)
+                  yield * this.setOperation(i)
                }
                // get next i
                if (i.right == null) {
                  break
                } else {
                  ids.push(i.id)
-                  i = yield* this.getOperation(i.right)
+                  i = yield * this.getOperation(i.right)
                }
              }
            }
@@ -506,19 +500,20 @@ module.exports = function (Y/* :any */) {
            // ** Now the new implementation starts **
            // reset neworigin of all originOf[*]
            for (var _i in o.originOf) {
-              var originsIn = yield* this.getOperation(o.originOf[_i])
+              var originsIn = yield * this.getOperation(o.originOf[_i])
              if (originsIn != null) {
                originsIn.origin = neworigin
-                yield* this.setOperation(originsIn)
+                yield * this.setOperation(originsIn)
              }
            }
            if (neworigin != null) {
+              var neworigin_ = yield * this.getInsertion(neworigin)
              if (neworigin_.originOf == null) {
                neworigin_.originOf = o.originOf
              } else {
                neworigin_.originOf = o.originOf.concat(neworigin_.originOf)
              }
-              yield* this.setOperation(neworigin_)
+              yield * this.setOperation(neworigin_)
            }
            // we don't need to set right here, because
            // right should be in o.originOf => it is set it the previous for loop
@@ -527,15 +522,15 @@ module.exports = function (Y/* :any */) {
        // o may originate in another operation.
        // Since o is deleted, we have to reset o.origin's `originOf` property
        if (o.origin != null) {
-          var origin = yield* this.getInsertion(o.origin)
+          var origin = yield * this.getInsertion(o.origin)
          origin.originOf = origin.originOf.filter(function (_id) {
            return !Y.utils.compareIds(id, _id)
          })
-          yield* this.setOperation(origin)
+          yield * this.setOperation(origin)
        }
        var parent
        if (o.parent != null) {
-          parent = yield* this.getOperation(o.parent)
+          parent = yield * this.getOperation(o.parent)
        }
        // remove gc'd op from parent, if it exists
        if (parent != null) {
@@ -562,32 +557,32 @@ module.exports = function (Y/* :any */) {
            }
          }
          if (setParent) {
-            yield* this.setOperation(parent)
+            yield * this.setOperation(parent)
          }
        }
        // finally remove it from the os
-        yield* this.removeOperation(o.id)
+        yield * this.removeOperation(o.id)
      }
    }
    * checkDeleteStoreForState (state) {
-      var n = yield* this.ds.findWithUpperBound([state.user, state.clock])
+      var n = yield * this.ds.findWithUpperBound([state.user, state.clock])
      if (n != null && n.id[0] === state.user && n.gc) {
        state.clock = Math.max(state.clock, n.id[1] + n.len)
      }
    }
    * updateState (user) {
-      var state = yield* this.getState(user)
-      yield* this.checkDeleteStoreForState(state)
-      var o = yield* this.getInsertion([user, state.clock])
+      var state = yield * this.getState(user)
+      yield * this.checkDeleteStoreForState(state)
+      var o = yield * this.getInsertion([user, state.clock])
      var oLength = (o != null && o.content != null) ? o.content.length : 1
      while (o != null && user === o.id[0] && o.id[1] <= state.clock && o.id[1] + oLength > state.clock) {
        // either its a new operation (1. case), or it is an operation that was deleted, but is not yet in the OS
        state.clock += oLength
-        yield* this.checkDeleteStoreForState(state)
-        o = yield* this.os.findNext(o.id)
+        yield * this.checkDeleteStoreForState(state)
+        o = yield * this.os.findNext(o.id)
        oLength = (o != null && o.content != null) ? o.content.length : 1
      }
-      yield* this.setState(state)
+      yield * this.setState(state)
    }
    /*
      apply a delete set in order to get
@@ -600,7 +595,7 @@ module.exports = function (Y/* :any */) {
        var dv = ds[user]
        var pos = 0
        var d = dv[pos]
-        yield* this.ds.iterate(this, [user, 0], [user, Number.MAX_VALUE], function * (n) {
+        yield * this.ds.iterate(this, [user, 0], [user, Number.MAX_VALUE], function * (n) {
          // cases:
          // 1. d deletes something to the right of n
          //  => go to next n (break)
@@ -649,14 +644,14 @@ module.exports = function (Y/* :any */) {
      for (var i = 0; i < deletions.length; i++) {
        var del = deletions[i]
        // always try to delete..
-        yield* this.deleteOperation([del[0], del[1]], del[2])
+        yield * this.deleteOperation([del[0], del[1]], del[2])
        if (del[3]) {
          // gc..
-          yield* this.markGarbageCollected([del[0], del[1]], del[2]) // always mark gc'd
+          yield * this.markGarbageCollected([del[0], del[1]], del[2]) // always mark gc'd
          // remove operation..
          var counter = del[1] + del[2]
          while (counter >= del[1]) {
-            var o = yield* this.os.findWithUpperBound([del[0], counter - 1])
+            var o = yield * this.os.findWithUpperBound([del[0], counter - 1])
            if (o == null) {
              break
            }
@@ -667,14 +662,14 @@ module.exports = function (Y/* :any */) {
            }
            if (o.id[1] + oLen > del[1] + del[2]) {
              // overlaps right
-              o = yield* this.getInsertionCleanEnd([del[0], del[1] + del[2] - 1])
+              o = yield * this.getInsertionCleanEnd([del[0], del[1] + del[2] - 1])
            }
            if (o.id[1] < del[1]) {
              // overlaps left
-              o = yield* this.getInsertionCleanStart([del[0], del[1]])
+              o = yield * this.getInsertionCleanStart([del[0], del[1]])
            }
            counter = o.id[1]
-            yield* this.garbageCollectOperation(o.id)
+            yield * this.garbageCollectOperation(o.id)
          }
        }
        if (this.store.forwardAppliedOperations) {
@@ -685,7 +680,7 @@ module.exports = function (Y/* :any */) {
      }
    }
    * isGarbageCollected (id) {
-      var n = yield* this.ds.findWithUpperBound(id)
+      var n = yield * this.ds.findWithUpperBound(id)
      return n != null && n.id[0] === id[0] && id[1] < n.id[1] + n.len && n.gc
    }
    /*
@@ -693,7 +688,7 @@ module.exports = function (Y/* :any */) {
    */
    * getDeleteSet () {
      var ds = {}
-      yield* this.ds.iterate(this, null, null, function * (n) {
+      yield * this.ds.iterate(this, null, null, function * (n) {
        var user = n.id[0]
        var counter = n.id[1]
        var len = n.len
@@ -708,15 +703,15 @@ module.exports = function (Y/* :any */) {
      return ds
    }
    * isDeleted (id) {
-      var n = yield* this.ds.findWithUpperBound(id)
+      var n = yield * this.ds.findWithUpperBound(id)
      return n != null && n.id[0] === id[0] && id[1] < n.id[1] + n.len
    }
    * setOperation (op) {
-      yield* this.os.put(op)
+      yield * this.os.put(op)
      return op
    }
    * addOperation (op) {
-      yield* this.os.put(op)
+      yield * this.os.put(op)
      if (this.store.y.connector.isSynced && this.store.forwardAppliedOperations && typeof op.id[1] !== 'string') {
        // is connected, and this is not going to be send in addOperation
        this.store.y.connector.broadcastOps([op])
@@ -731,7 +726,7 @@ module.exports = function (Y/* :any */) {
        op.left[0] === op.id[0] &&
        Y.utils.compareIds(op.left, op.origin)
      ) {
-        var left = yield* this.getInsertion(op.left)
+        var left = yield * this.getInsertion(op.left)
        if (left.content != null &&
            left.id[1] + left.content.length === op.id[1] &&
            left.originOf.length === 1 &&
@@ -746,13 +741,13 @@ module.exports = function (Y/* :any */) {
          }
          left.content = left.content.concat(op.content)
          left.right = op.right
-          yield* this.os.delete(op.id)
-          yield* this.setOperation(left)
+          yield * this.os.delete(op.id)
+          yield * this.setOperation(left)
        }
      }
    }
    * getInsertion (id) {
-      var ins = yield* this.os.findWithUpperBound(id)
+      var ins = yield * this.os.findWithUpperBound(id)
      if (ins == null) {
        return null
      } else {
@@ -765,13 +760,13 @@ module.exports = function (Y/* :any */) {
      }
    }
    * getInsertionCleanStartEnd (id) {
-      yield* this.getInsertionCleanStart(id)
-      return yield* this.getInsertionCleanEnd(id)
+      yield * this.getInsertionCleanStart(id)
+      return yield * this.getInsertionCleanEnd(id)
    }
    // Return an insertion such that id is the first element of content
    // This function manipulates an operation, if necessary
    * getInsertionCleanStart (id) {
-      var ins = yield* this.getInsertion(id)
+      var ins = yield * this.getInsertion(id)
      if (ins != null) {
        if (ins.id[1] === id[1]) {
          return ins
@@ -785,8 +780,8 @@ module.exports = function (Y/* :any */) {
          left.right = ins.id
          ins.left = leftLid
          // debugger // check
-          yield* this.setOperation(left)
-          yield* this.setOperation(ins)
+          yield * this.setOperation(left)
+          yield * this.setOperation(ins)
          if (left.gc) {
            this.store.queueGarbageCollector(ins.id)
          }
@@ -799,7 +794,7 @@ module.exports = function (Y/* :any */) {
    // Return an insertion such that id is the last element of content
    // This function manipulates an operation, if necessary
    * getInsertionCleanEnd (id) {
-      var ins = yield* this.getInsertion(id)
+      var ins = yield * this.getInsertion(id)
      if (ins != null) {
        if (ins.content == null || (ins.id[1] + ins.content.length - 1 === id[1])) {
          return ins
@@ -813,8 +808,8 @@ module.exports = function (Y/* :any */) {
          ins.right = right.id
          right.left = insLid
          // debugger // check
-          yield* this.setOperation(right)
-          yield* this.setOperation(ins)
+          yield * this.setOperation(right)
+          yield * this.setOperation(ins)
          if (ins.gc) {
            this.store.queueGarbageCollector(right.id)
          }
@@ -825,7 +820,7 @@ module.exports = function (Y/* :any */) {
      }
    }
    * getOperation (id/* :any */)/* :Transaction<any> */ {
-      var o = yield* this.os.find(id)
+      var o = yield * this.os.find(id)
      if (id[0] !== '_' || o != null) {
        return o
      } else { // type is string
@@ -835,28 +830,28 @@ module.exports = function (Y/* :any */) {
          var struct = comp[0]
          var op = Y.Struct[struct].create(id)
          op.type = comp[1]
-          yield* this.setOperation(op)
+          yield * this.setOperation(op)
          return op
        } else {
-          // won't be called. but just in case..
-          console.error('Unexpected case. How can this happen?')
-          debugger // eslint-disable-line
-          return null
+          throw new Error(
+            'Unexpected case. Operation cannot be generated correctly!' +
+            'Incompatible Yjs version?'
+          )
        }
      }
    }
    * removeOperation (id) {
-      yield* this.os.delete(id)
+      yield * this.os.delete(id)
    }
    * setState (state) {
      var val = {
        id: [state.user],
        clock: state.clock
      }
-      yield* this.ss.put(val)
+      yield * this.ss.put(val)
    }
    * getState (user) {
-      var n = yield* this.ss.find([user])
+      var n = yield * this.ss.find([user])
      var clock = n == null ? null : n.clock
      if (clock == null) {
        clock = 0
@@ -868,7 +863,7 @@ module.exports = function (Y/* :any */) {
    }
    * getStateVector () {
      var stateVector = []
-      yield* this.ss.iterate(this, null, null, function * (n) {
+      yield * this.ss.iterate(this, null, null, function * (n) {
        stateVector.push({
          user: n.id[0],
          clock: n.clock
@@ -878,7 +873,7 @@ module.exports = function (Y/* :any */) {
    }
    * getStateSet () {
      var ss = {}
-      yield* this.ss.iterate(this, null, null, function * (n) {
+      yield * this.ss.iterate(this, null, null, function * (n) {
        ss[n.id[0]] = n.clock
      })
      return ss
@@ -936,53 +931,65 @@ module.exports = function (Y/* :any */) {
      }
      var send = []

-      var endSV = yield* this.getStateVector()
-      for (var endState of endSV) {
-        var user = endState.user
+      var endSV = yield * this.getStateVector()
+      for (let endState of endSV) {
+        let user = endState.user
        if (user === '_') {
          continue
        }
-        var startPos = startSS[user] || 0
+        let startPos = startSS[user] || 0
        if (startPos > 0) {
          // There is a change that [user, startPos] is in a composed Insertion (with a smaller counter)
          // find out if that is the case
-          var firstMissing = yield* this.getInsertion([user, startPos])
+          let firstMissing = yield * this.getInsertion([user, startPos])
          if (firstMissing != null) {
            // update startPos
            startPos = firstMissing.id[1]
-            startSS[user] = startPos
          }
        }
-        yield* this.os.iterate(this, [user, startPos], [user, Number.MAX_VALUE], function * (op) {
+        startSS[user] = startPos
+      }
+      for (let endState of endSV) {
+        let user = endState.user
+        let startPos = startSS[user]
+        if (user === '_') {
+          continue
+        }
+        yield * this.os.iterate(this, [user, startPos], [user, Number.MAX_VALUE], function * (op) {
          op = Y.Struct[op.struct].encode(op)
          if (op.struct !== 'Insert') {
            send.push(op)
          } else if (op.right == null || op.right[1] < (startSS[op.right[0]] || 0)) {
            // case 1. op.right is known
-            var o = op
+            // this case is only reached if op.right is known.
+            // => this is not called for op.left, as op.right is unknown
+            let o = op
            // Remember: ?
            // -> set op.right
            //    1. to the first operation that is known (according to startSS)
            //    2. or to the first operation that has an origin that is not to the
            //      right of op.
            // For this we maintain a list of ops which origins are not found yet.
-            var missing_origins = [op]
+            var missingOrigins = [op]
            var newright = op.right
            while (true) {
              if (o.left == null) {
                op.left = null
                send.push(op)
-                if (!Y.utils.compareIds(o.id, op.id)) {
+                /* not necessary, as o is already sent..
+                if (!Y.utils.compareIds(o.id, op.id) && o.id[1] >= (startSS[o.id[0]] || 0)) {
+                  // o is not op && o is unknown
                  o = Y.Struct[op.struct].encode(o)
-                  o.right = missing_origins[missing_origins.length - 1].id
+                  o.right = missingOrigins[missingOrigins.length - 1].id
                  send.push(o)
                }
+                */
                break
              }
-              o = yield* this.getInsertion(o.left)
-              // we set another o, check if we can reduce $missing_origins
-              while (missing_origins.length > 0 && Y.utils.matchesId(o, missing_origins[missing_origins.length - 1].origin)) {
-                missing_origins.pop()
+              o = yield * this.getInsertion(o.left)
+              // we set another o, check if we can reduce $missingOrigins
+              while (missingOrigins.length > 0 && Y.utils.matchesId(o, missingOrigins[missingOrigins.length - 1].origin)) {
+                missingOrigins.pop()
              }
              if (o.id[1] < (startSS[o.id[0]] || 0)) {
                // case 2. o is known
@@ -995,17 +1002,20 @@ module.exports = function (Y/* :any */) {
                send.push(op)
                op = Y.Struct[op.struct].encode(o)
                op.right = newright
-                if (missing_origins.length > 0) {
-                  console.log('This should not happen .. :( please report this')
+                if (missingOrigins.length > 0) {
+                  throw new Error(
+                    'Reached inconsistent OS state.' +
+                    'Operations are not correctly connected.'
+                  )
                }
-                missing_origins = [op]
+                missingOrigins = [op]
              } else {
                // case 4. send o, continue to find op.origin
                var s = Y.Struct[op.struct].encode(o)
-                s.right = missing_origins[missing_origins.length - 1].id
+                s.right = missingOrigins[missingOrigins.length - 1].id
                s.left = s.origin
                send.push(s)
-                missing_origins.push(o)
+                missingOrigins.push(o)
              }
            }
          }
@@ -1020,7 +1030,7 @@ module.exports = function (Y/* :any */) {
     */
    * getOperationsUntransformed () {
      var ops = []
-      yield* this.os.iterate(this, null, null, function * (op) {
+      yield * this.os.iterate(this, null, null, function * (op) {
        if (op.id[0] !== '_') {
          ops.push(op)
        }
@@ -1039,25 +1049,25 @@ module.exports = function (Y/* :any */) {
            // update parents .map/start/end properties
            if (op.parentSub != null && op.left == null) {
              // op is child of Map
-              let parent = yield* this.getOperation(op.parent)
+              let parent = yield * this.getOperation(op.parent)
              parent.map[op.parentSub] = op.id
-              yield* this.setOperation(parent)
+              yield * this.setOperation(parent)
            } else if (op.right == null || op.left == null) {
-              let parent = yield* this.getOperation(op.parent)
+              let parent = yield * this.getOperation(op.parent)
              if (op.right == null) {
                parent.end = Y.utils.getLastId(op)
              }
              if (op.left == null) {
                parent.start = op.id
              }
-              yield* this.setOperation(parent)
+              yield * this.setOperation(parent)
            }
          }
        }
-        yield* this.os.put(op)
+        yield * this.os.put(op)
      }
      for (var user in stateSet) {
-        yield* this.ss.put({
+        yield * this.ss.put({
          id: [user],
          clock: stateSet[user]
        })
@@ -1074,7 +1084,7 @@ module.exports = function (Y/* :any */) {
      // or the o that has no origin to the right of op
      // (this is why we use the ids array)
      while (o.right != null) {
-        var right = yield* this.getOperation(o.right)
+        var right = yield * this.getOperation(o.right)
        if (o.right[1] < (startSS[o.right[0]] || 0) || !ids.some(function (id) {
          return Y.utils.compareIds(id, right.origin)
        })) {
@@ -1089,9 +1099,9 @@ module.exports = function (Y/* :any */) {
    }
    */
    * flush () {
-      yield* this.os.flush()
-      yield* this.ss.flush()
-      yield* this.ds.flush()
+      yield * this.os.flush()
+      yield * this.ss.flush()
+      yield * this.ds.flush()
    }
  }
  Y.Transaction = TransactionInterface
--- a/src/Utils.js
+++ b/src/Utils.js
@@ -1,6 +1,3 @@
-/* @flow */
-'use strict'
-
 /*
  EventHandler is an helper class for constructing custom types.

@@ -23,7 +20,8 @@
  database request to finish). EventHandler helps you to make your type
  synchronous.
 */
-module.exports = function (Y /* : any*/) {
+
+export default function Utils (Y) {
  Y.utils = {}

  Y.utils.bubbleEvent = function (type, event) {
@@ -44,6 +42,32 @@ module.exports = function (Y /* : any*/) {
    }
  }

+  class NamedEventHandler {
+    constructor () {
+      this._eventListener = {}
+    }
+    on (name, f) {
+      if (this._eventListener[name] == null) {
+        this._eventListener[name] = []
+      }
+      this._eventListener[name].push(f)
+    }
+    off (name, f) {
+      if (name == null || f == null) {
+        throw new Error('You must specify event name and function!')
+      }
+      let listener = this._eventListener[name] || []
+      this._eventListener[name] = listener.filter(e => e !== f)
+    }
+    emit (name, value) {
+      (this._eventListener[name] || []).forEach(l => l(value))
+    }
+    destroy () {
+      this._eventListener = null
+    }
+  }
+  Y.utils.NamedEventHandler = NamedEventHandler
+
  class EventListenerHandler {
    constructor () {
      this.eventListeners = []
@@ -74,7 +98,12 @@ module.exports = function (Y /* : any*/) {
          }
          this.eventListeners[i](_event)
        } catch (e) {
-          console.error('Your observer threw an error. This error was caught so that Yjs still can ensure data consistency! In order to debug this error you have to check "Pause On Caught Exceptions"', e)
+          /*
+            Your observer threw an error. This error was caught so that Yjs
+            can ensure data consistency! In order to debug this error you
+            have to check "Pause On Caught Exceptions" in developer tools.
+          */
+          console.error(e)
        }
      }
    }
@@ -303,7 +332,7 @@ module.exports = function (Y /* : any*/) {
      }
      var before = this.waiting.length
      // somehow create new operations
-      yield* f.apply(transaction, args)
+      yield * f.apply(transaction, args)
      // remove all appended ops / awaited ops
      this.waiting.splice(before)
      if (this.awaiting > 0) this.awaiting--
@@ -313,7 +342,7 @@ module.exports = function (Y /* : any*/) {
        for (let i = 0; i < this.waiting.length; i++) {
          var o = this.waiting[i]
          if (o.struct === 'Insert') {
-            var _o = yield* transaction.getInsertion(o.id)
+            var _o = yield * transaction.getInsertion(o.id)
            if (_o.parentSub != null && _o.left != null) {
              // if o is an insertion of a map struc (parentSub is defined), then it shouldn't be necessary to compute left
              this.waiting.splice(i, 1)
@@ -325,10 +354,10 @@ module.exports = function (Y /* : any*/) {
              o.left = null
            } else {
              // find next undeleted op
-              var left = yield* transaction.getInsertion(_o.left)
+              var left = yield * transaction.getInsertion(_o.left)
              while (left.deleted != null) {
                if (left.left != null) {
-                  left = yield* transaction.getInsertion(left.left)
+                  left = yield * transaction.getInsertion(left.left)
                } else {
                  left = null
                  break
@@ -612,6 +641,7 @@ module.exports = function (Y /* : any*/) {
        }
      }
    }
+    return false
  }
  Y.utils.matchesId = matchesId

@@ -679,7 +709,7 @@ module.exports = function (Y /* : any*/) {
        if (i < 0 && noSuperCall === undefined) {
          // did not reach break in last loop
          // read id and put it to the end of readBuffer
-          o = yield* super.find(id)
+          o = yield * super.find(id)
        }
        if (o != null) {
          for (i = 0; i < this.readBuffer.length - 1; i++) {
@@ -709,7 +739,7 @@ module.exports = function (Y /* : any*/) {
          // write writeBuffer[0]
          var write = this.writeBuffer[0]
          if (write.id[0] !== null) {
-            yield* super.put(write)
+            yield * super.put(write)
          }
          // put o to the end of writeBuffer
          for (i = 0; i < this.writeBuffer.length - 1; i++) {
@@ -739,44 +769,44 @@ module.exports = function (Y /* : any*/) {
            }
          }
        }
-        yield* this.flush()
-        yield* super.delete(id)
+        yield * this.flush()
+        yield * super.delete(id)
      }
      * findWithLowerBound (id) {
-        var o = yield* this.find(id, true)
+        var o = yield * this.find(id, true)
        if (o != null) {
          return o
        } else {
-          yield* this.flush()
-          return yield* super.findWithLowerBound.apply(this, arguments)
+          yield * this.flush()
+          return yield * super.findWithLowerBound.apply(this, arguments)
        }
      }
      * findWithUpperBound (id) {
-        var o = yield* this.find(id, true)
+        var o = yield * this.find(id, true)
        if (o != null) {
          return o
        } else {
-          yield* this.flush()
-          return yield* super.findWithUpperBound.apply(this, arguments)
+          yield * this.flush()
+          return yield * super.findWithUpperBound.apply(this, arguments)
        }
      }
      * findNext () {
-        yield* this.flush()
-        return yield* super.findNext.apply(this, arguments)
+        yield * this.flush()
+        return yield * super.findNext.apply(this, arguments)
      }
      * findPrev () {
-        yield* this.flush()
-        return yield* super.findPrev.apply(this, arguments)
+        yield * this.flush()
+        return yield * super.findPrev.apply(this, arguments)
      }
      * iterate () {
-        yield* this.flush()
-        yield* super.iterate.apply(this, arguments)
+        yield * this.flush()
+        yield * super.iterate.apply(this, arguments)
      }
      * flush () {
        for (var i = 0; i < this.writeBuffer.length; i++) {
          var write = this.writeBuffer[i]
          if (write.id[0] !== null) {
-            yield* super.put(write)
+            yield * super.put(write)
            this.writeBuffer[i] = {
              id: [null, null]
            }
--- a/src/y.js
+++ b/src/y.js
@@ -1,18 +1,20 @@
-/* @flow */
-'use strict'
+import debug from 'debug'
+import extendConnector from './Connector.js'
+import extendDatabase from './Database.js'
+import extendTransaction from './Transaction.js'
+import extendStruct from './Struct.js'
+import extendUtils from './Utils.js'

-require('./Connector.js')(Y)
-require('./Database.js')(Y)
-require('./Transaction.js')(Y)
-require('./Struct.js')(Y)
-require('./Utils.js')(Y)
-require('./Connectors/Test.js')(Y)
+extendConnector(Y)
+extendDatabase(Y)
+extendTransaction(Y)
+extendStruct(Y)
+extendUtils(Y)

-Y.debug = require('debug')
+Y.debug = debug

 var requiringModules = {}

-module.exports = Y
 Y.requiringModules = requiringModules

 Y.extend = function (name, value) {
@@ -110,7 +112,7 @@ type YOptions = {
 }
 */

-function Y (opts/* :YOptions */) /* :Promise<YConfig> */ {
+export default function Y (opts/* :YOptions */) /* :Promise<YConfig> */ {
  if (opts.hasOwnProperty('sourceDir')) {
    Y.sourceDir = opts.sourceDir
  }
@@ -120,31 +122,29 @@ function Y (opts/* :YOptions */) /* :Promise<YConfig> */ {
    modules.push(opts.share[name])
  }
  return new Promise(function (resolve, reject) {
-    if (opts == null) reject('An options object is expected! ')
-    else if (opts.connector == null) reject('You must specify a connector! (missing connector property)')
-    else if (opts.connector.name == null) reject('You must specify connector name! (missing connector.name property)')
-    else if (opts.db == null) reject('You must specify a database! (missing db property)')
-    else if (opts.connector.name == null) reject('You must specify db name! (missing db.name property)')
+    if (opts == null) reject(new Error('An options object is expected!'))
+    else if (opts.connector == null) reject(new Error('You must specify a connector! (missing connector property)'))
+    else if (opts.connector.name == null) reject(new Error('You must specify connector name! (missing connector.name property)'))
+    else if (opts.db == null) reject(new Error('You must specify a database! (missing db property)'))
+    else if (opts.connector.name == null) reject(new Error('You must specify db name! (missing db.name property)'))
    else {
      opts = Y.utils.copyObject(opts)
      opts.connector = Y.utils.copyObject(opts.connector)
      opts.db = Y.utils.copyObject(opts.db)
      opts.share = Y.utils.copyObject(opts.share)
-      setTimeout(function () {
-        Y.requestModules(modules).then(function () {
-          var yconfig = new YConfig(opts)
-          yconfig.db.whenUserIdSet(function () {
-            yconfig.init(function () {
-              resolve(yconfig)
-            })
+      Y.requestModules(modules).then(function () {
+        var yconfig = new YConfig(opts)
+        yconfig.db.whenUserIdSet(function () {
+          yconfig.init(function () {
+            resolve(yconfig)
          })
-        }).catch(reject)
-      }, 0)
+        })
+      }).catch(reject)
    }
  })
 }

-class YConfig {
+class YConfig extends Y.utils.NamedEventHandler {
  /* ::
  db: Y.AbstractDatabase;
  connector: Y.AbstractConnector;
@@ -152,6 +152,7 @@ class YConfig {
  options: Object;
  */
  constructor (opts, callback) {
+    super()
    this.options = opts
    this.db = new Y[opts.db.name](this, opts.db)
    this.connector = new Y[opts.connector.name](this, opts.connector)
@@ -182,7 +183,7 @@ class YConfig {
            args = typedef.parseArguments(args[0])[1]
          }
        }
-        share[propertyname] = yield* this.store.initType.call(this, id, args)
+        share[propertyname] = yield * this.store.initType.call(this, id, args)
      }
      this.store.whenTransactionsFinished()
        .then(callback)
@@ -215,6 +216,9 @@ class YConfig {
      } else {
        return Promise.resolve()
      }
+    }).then(() => {
+      // remove existing event listener
+      super.destroy()
    })
  }
  close () {
@@ -225,13 +229,13 @@ class YConfig {
    } else {
      this.connector.disconnect()
    }
-    return this.db.whenTransactionsFinished(function () {
-      this.db.destroyTypes()
+    return this.db.whenTransactionsFinished().then(function () {
+      self.db.destroyTypes()
      // make sure to wait for all transactions before destroying the db
-      this.db.requestTransaction(function * () {
-        yield* self.db.destroy()
+      self.db.requestTransaction(function * () {
+        yield * self.db.destroy()
      })
-      return this.db.whenTransactionsFinished()
+      return self.db.whenTransactionsFinished()
    })
  }
 }
--- a/tests-lib/helper.js
+++ b/tests-lib/helper.js
@@ -0,0 +1,191 @@
+
+import _Y from '../../yjs/src/y.js'
+
+import yMemory from '../../y-memory/src/y-memory.js'
+import yArray from '../../y-array/src/y-array.js'
+import yMap from '../../y-map/src/Map.js'
+import yTest from './test-connector.js'
+
+import Chance from 'chance'
+
+export let Y = _Y
+
+Y.extend(yMemory, yArray, yMap, yTest)
+
+export async function garbageCollectUsers (t, users) {
+  await flushAll(t, users)
+  await Promise.all(users.map(u => u.db.emptyGarbageCollector()))
+}
+
+/*
+ * 1. reconnect and flush all
+ * 2. user 0 gc
+ * 3. get type content
+ * 4. disconnect & reconnect all (so gc is propagated)
+ * 5. compare os, ds, ss
+ */
+export async function compareUsers (t, users) {
+  await Promise.all(users.map(u => u.reconnect()))
+  if (users[0].connector.testRoom == null) {
+    await wait(100)
+  }
+  await flushAll(t, users)
+  await wait()
+  await flushAll(t, users)
+
+  var userTypeContents = users.map(u => u.share.array._content.map(c => c.val || JSON.stringify(c.type)))
+
+  await users[0].db.garbageCollect()
+  await users[0].db.garbageCollect()
+
+  // disconnect all except user 0
+  await Promise.all(users.slice(1).map(async u =>
+    u.disconnect()
+  ))
+  if (users[0].connector.testRoom == null) {
+    await wait(100)
+  }
+  // reconnect all
+  await Promise.all(users.map(u => u.reconnect()))
+  if (users[0].connector.testRoom == null) {
+    await wait(100)
+  }
+  await users[0].connector.testRoom.flushAll(users)
+  await Promise.all(users.map(u =>
+    new Promise(function (resolve) {
+      u.connector.whenSynced(resolve)
+    })
+  ))
+  let filterDeletedOps = users.every(u => u.db.gc === false)
+  var data = await Promise.all(users.map(async (u) => {
+    var data = {}
+    u.db.requestTransaction(function * () {
+      var os = yield * this.getOperationsUntransformed()
+      data.os = {}
+      for (let i = 0; i < os.untransformed.length; i++) {
+        let op = os.untransformed[i]
+        op = Y.Struct[op.struct].encode(op)
+        delete op.origin
+        /*
+          If gc = false, it is necessary to filter deleted ops
+          as they might have been split up differently..
+         */
+        if (filterDeletedOps) {
+          let opIsDeleted = yield * this.isDeleted(op.id)
+          if (!opIsDeleted) {
+            data.os[JSON.stringify(op.id)] = op
+          }
+        } else {
+          data.os[JSON.stringify(op.id)] = op
+        }
+      }
+      data.ds = yield * this.getDeleteSet()
+      data.ss = yield * this.getStateSet()
+    })
+    await u.db.whenTransactionsFinished()
+    return data
+  }))
+  for (var i = 0; i < data.length - 1; i++) {
+    await t.asyncGroup(async () => {
+      t.compare(userTypeContents[i], userTypeContents[i + 1], 'types')
+      t.compare(data[i].os, data[i + 1].os, 'os')
+      t.compare(data[i].ds, data[i + 1].ds, 'ds')
+      t.compare(data[i].ss, data[i + 1].ss, 'ss')
+    }, `Compare user${i} with user${i + 1}`)
+  }
+  await Promise.all(users.map(async (u) => {
+    await u.close()
+  }))
+}
+
+export async function initArrays (t, opts) {
+  var result = {
+    users: []
+  }
+  var share = Object.assign({ flushHelper: 'Map', array: 'Array' }, opts.share)
+  var chance = opts.chance || new Chance(t.getSeed() * 1000000000)
+  var connector = Object.assign({ room: 'debugging_' + t.name, testContext: t, chance }, opts.connector)
+  for (let i = 0; i < opts.users; i++) {
+    let dbOpts
+    let connOpts
+    if (i === 0) {
+      // Only one instance can gc!
+      dbOpts = Object.assign({ gc: true }, opts.db)
+      connOpts = Object.assign({ role: 'master' }, connector)
+    } else {
+      dbOpts = Object.assign({ gc: false }, opts.db)
+      connOpts = Object.assign({ role: 'slave' }, connector)
+    }
+    let y = await Y({
+      connector: connOpts,
+      db: dbOpts,
+      share: share
+    })
+    result.users.push(y)
+    for (let name in share) {
+      result[name + i] = y.share[name]
+    }
+  }
+  result.array0.delete(0, result.array0.length)
+  if (result.users[0].connector.testRoom != null) {
+    // flush for sync if test-connector
+    await result.users[0].connector.testRoom.flushAll(result.users)
+  }
+  await Promise.all(result.users.map(u => {
+    return new Promise(function (resolve) {
+      u.connector.whenSynced(resolve)
+    })
+  }))
+  await flushAll(t, result.users)
+  return result
+}
+
+export async function flushAll (t, users) {
+  // users = users.filter(u => u.connector.isSynced)
+  if (users.length === 0) {
+    return
+  }
+  await wait(0)
+  if (users[0].connector.testRoom != null) {
+    // use flushAll method specified in Test Connector
+    await users[0].connector.testRoom.flushAll(users)
+  } else {
+    // flush for any connector
+    await Promise.all(users.map(u => { return u.db.whenTransactionsFinished() }))
+
+    var flushCounter = users[0].share.flushHelper.get('0') || 0
+    flushCounter++
+    await Promise.all(users.map(async (u, i) => {
+      // wait for all users to set the flush counter to the same value
+      await new Promise(resolve => {
+        function observer () {
+          var allUsersReceivedUpdate = true
+          for (var i = 0; i < users.length; i++) {
+            if (u.share.flushHelper.get(i + '') !== flushCounter) {
+              allUsersReceivedUpdate = false
+              break
+            }
+          }
+          if (allUsersReceivedUpdate) {
+            resolve()
+          }
+        }
+        u.share.flushHelper.observe(observer)
+        u.share.flushHelper.set(i + '', flushCounter)
+      })
+    }))
+  }
+}
+
+export async function flushSome (t, users) {
+  if (users[0].connector.testRoom == null) {
+    // if not test-connector, wait for some time for operations to arrive
+    await wait(100)
+  }
+}
+
+export function wait (t) {
+  return new Promise(function (resolve) {
+    setTimeout(resolve, t != null ? t : 100)
+  })
+}
--- a/tests-lib/test-connector.js
+++ b/tests-lib/test-connector.js
@@ -0,0 +1,156 @@
+/* global Y */
+import { wait } from './helper.js'
+
+var rooms = {}
+
+export class TestRoom {
+  constructor (roomname) {
+    this.room = roomname
+    this.users = {}
+    this.nextUserId = 0
+  }
+  join (connector) {
+    if (connector.userId == null) {
+      connector.setUserId('' + (this.nextUserId++))
+    }
+    Object.keys(this.users).forEach(uid => {
+      let user = this.users[uid]
+      if (user.role === 'master' || connector.role === 'master') {
+        this.users[uid].userJoined(connector.userId, connector.role)
+        connector.userJoined(uid, this.users[uid].role)
+      }
+    })
+    this.users[connector.userId] = connector
+  }
+  leave (connector) {
+    delete this.users[connector.userId]
+    Object.keys(this.users).forEach(uid => {
+      this.users[uid].userLeft(connector.userId)
+    })
+  }
+  send (sender, receiver, m) {
+    m = JSON.parse(JSON.stringify(m))
+    var user = this.users[receiver]
+    if (user != null) {
+      user.receiveMessage(sender, m)
+    }
+  }
+  broadcast (sender, m) {
+    Object.keys(this.users).forEach(receiver => {
+      this.send(sender, receiver, m)
+    })
+  }
+  async flushAll (users) {
+    let flushing = true
+    let allUserIds = Object.keys(this.users)
+    if (users == null) {
+      users = allUserIds.map(id => this.users[id].y)
+    }
+    while (flushing) {
+      await wait(10)
+      let res = await Promise.all(allUserIds.map(id => this.users[id]._flushAll(users)))
+      flushing = res.some(status => status === 'flushing')
+    }
+  }
+}
+
+function getTestRoom (roomname) {
+  if (rooms[roomname] == null) {
+    rooms[roomname] = new TestRoom(roomname)
+  }
+  return rooms[roomname]
+}
+
+export default function extendTestConnector (Y) {
+  class TestConnector extends Y.AbstractConnector {
+    constructor (y, options) {
+      if (options === undefined) {
+        throw new Error('Options must not be undefined!')
+      }
+      if (options.room == null) {
+        throw new Error('You must define a room name!')
+      }
+      options.forwardAppliedOperations = options.role === 'master'
+      super(y, options)
+      this.options = options
+      this.room = options.room
+      this.chance = options.chance
+      this.testRoom = getTestRoom(this.room)
+      this.testRoom.join(this)
+    }
+    disconnect () {
+      this.testRoom.leave(this)
+      return super.disconnect()
+    }
+    reconnect () {
+      this.testRoom.join(this)
+      return super.reconnect()
+    }
+    send (uid, message) {
+      this.testRoom.send(this.userId, uid, message)
+    }
+    broadcast (message) {
+      this.testRoom.broadcast(this.userId, message)
+    }
+    async whenSynced (f) {
+      var synced = false
+      var periodicFlushTillSync = () => {
+        if (synced) {
+          f()
+        } else {
+          this.testRoom.flushAll([this.y]).then(function () {
+            setTimeout(periodicFlushTillSync, 10)
+          })
+        }
+      }
+      periodicFlushTillSync()
+      return super.whenSynced(function () {
+        synced = true
+      })
+    }
+    receiveMessage (sender, m) {
+      if (this.userId !== sender && this.connections[sender] != null) {
+        var buffer = this.connections[sender].buffer
+        if (buffer == null) {
+          buffer = this.connections[sender].buffer = []
+        }
+        buffer.push(m)
+        if (this.chance.bool({likelihood: 30})) {
+          // flush 1/2 with 30% chance
+          var flushLength = Math.round(buffer.length / 2)
+          buffer.splice(0, flushLength).forEach(m => {
+            super.receiveMessage(sender, m)
+          })
+        }
+      }
+    }
+    async _flushAll (flushUsers) {
+      if (flushUsers.some(u => u.connector.userId === this.userId)) {
+        // this one needs to sync with every other user
+        flushUsers = Object.keys(this.connections).map(id => this.testRoom.users[id].y)
+      }
+      var finished = []
+      for (let i = 0; i < flushUsers.length; i++) {
+        let userId = flushUsers[i].connector.userId
+        if (userId !== this.userId && this.connections[userId] != null) {
+          let buffer = this.connections[userId].buffer
+          if (buffer != null) {
+            var messages = buffer.splice(0)
+            for (let j = 0; j < messages.length; j++) {
+              let p = super.receiveMessage(userId, messages[j])
+              finished.push(p)
+            }
+          }
+        }
+      }
+      await Promise.all(finished)
+      await this.y.db.whenTransactionsFinished()
+      return finished.length > 0 ? 'flushing' : 'done'
+    }
+  }
+  Y.extend('test', TestConnector)
+}
+
+if (typeof Y !== 'undefined') {
+  extendTestConnector(Y)
+}
--- a/y.js
+++ b/y.js
--- a/y.js.map
+++ b/y.js.map
Author	SHA1	Message	Date
Kevin Jahns	5688f6a03a	v13.0.0-3 -- distribution files	2017-07-06 03:29:38 +02:00
Kevin Jahns	434ec84837	13.0.0-3	2017-07-06 03:29:09 +02:00
Kevin Jahns	2b618cd83c	change to correct main file	2017-07-06 03:28:06 +02:00
Kevin Jahns	f4327529b9	13.0.0-2	2017-07-05 18:41:26 +02:00
Kevin Jahns	67189f4d44	dont lint in postversion	2017-07-05 18:40:41 +02:00
Kevin Jahns	6225fb4dfd	fix linting of examples	2017-07-05 18:33:16 +02:00
Kevin Jahns	a7550fe5d3	13.0.0-1	2017-07-05 18:12:35 +02:00
Kevin Jahns	9d9c84f40e	fit y-memory in helper.js	2017-07-05 18:10:24 +02:00
Kevin Jahns	ae91902de3	Yjs throws "error" event in unexpected cases. fixes #72	2017-07-05 17:58:19 +02:00
Kevin Jahns	033d24eee7	use y-memory@v8 directory structure	2017-07-05 17:44:17 +02:00
Kevin Jahns	8abef69aa7	implemented named event handler	2017-07-05 17:01:21 +02:00
Kevin Jahns	7e4dedab38	always use generateUniqueUserId. fixes #74	2017-07-05 11:40:19 +02:00
Kevin Jahns	85e488bbe6	Throw proper error stack when observer function thrown an error - implements #75	2017-07-05 11:37:22 +02:00
Kevin Jahns	a6a321da10	fix textarea example to fit new directory structure	2017-07-05 11:34:28 +02:00
Kevin Jahns	008764ccdc	remove dist submodule	2017-07-05 11:26:20 +02:00
Kevin Jahns	de5f4abe32	filter deleted ops only if gc is disabled	2017-07-04 04:59:07 -07:00
Kevin Jahns	382d06f6d4	reworked getOperations (decrease size of sent operations, fixe some gc issues). garbageCollectOperation now sets origin to the direct left operation, if possible	2017-07-03 23:19:11 -07:00
Kevin Jahns	66de422749	fix issues with new master-slave tests	2017-06-30 15:18:07 -07:00
Kevin Jahns	bbf5e39408	implemented client-server model (untested)	2017-06-30 14:07:14 -07:00
Kevin Jahns	c8bca15d72	13.0.0-0	2017-06-30 09:16:58 -07:00
Kevin Jahns	a64730e651	fix several sync issues. improve performance a bit by removing ds from first sync step	2017-06-29 15:04:36 -07:00
Kevin Jahns	409a9414f1	fix the "gc state" warning	2017-06-27 02:07:03 +02:00
Kevin Jahns	24facaab09	fix os comparison in compareUsers	2017-06-21 16:29:51 +02:00
Kevin Jahns	060549f2cb	enable gc in random tests	2017-06-19 21:16:42 +02:00
Kevin Jahns	dfe3b0b1d1	Merge branch 'master' into v13	2017-06-19 10:48:16 +02:00
Kevin Jahns	e23154bec2	update dependencies	2017-06-16 01:04:58 +02:00
Kevin Jahns	1682d43c26	added chancejs to dependencies	2017-06-07 21:43:52 +02:00
Kevin Jahns	68c417fe6f	fix gc timeout	2017-05-24 16:34:57 +02:00
Kevin Jahns	2ea163a5cf	outsourced helper and test-connector	2017-05-22 13:57:16 +02:00
Kevin Jahns	020dacdad4	removed some unnecessary setTimeouts	2017-05-21 00:31:16 +02:00
Kevin Jahns	42abcc897c	added examples	2017-05-19 02:22:00 +02:00
Kevin Jahns	0a321610aa	use rollup for yjs	2017-05-16 18:35:30 +02:00