13.5.40

Prefer globalThis over window and global

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "yjs",
-  "version": "13.5.39",
+  "version": "13.5.40",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "yjs",
-      "version": "13.5.39",
+      "version": "13.5.40",
       "license": "MIT",
       "dependencies": {
         "lib0": "^0.2.49"

package.json

@@ -1,6 +1,6 @@
 {
   "name": "yjs",
-  "version": "13.5.39",
+  "version": "13.5.40",
   "description": "Shared Editing Library",
   "main": "./dist/yjs.cjs",
   "module": "./dist/yjs.mjs",

src/index.js

@@ -93,10 +93,12 @@ export {
   UpdateEncoderV1
 } from './internals.js'
 
-const glo = /** @type {any} */ (typeof window !== 'undefined'
-  ? window
-  // @ts-ignore
-  : typeof global !== 'undefined' ? global : {})
+const glo = /** @type {any} */ (typeof globalThis !== 'undefined'
+  ? globalThis
+  : typeof window !== 'undefined'
+    ? window
+    // @ts-ignore
+    : typeof global !== 'undefined' ? global : {})
 
 const importIdentifier = '__ $YJS$ __'
 
@@ -112,7 +114,9 @@ if (glo[importIdentifier] === true) {
    * This often leads to issues that are hard to debug. We often need to perform constructor checks,
    * e.g. `struct instanceof GC`. If you imported different versions of Yjs, it is impossible for us to
    * do the constructor checks anymore - which might break the CRDT algorithm.
+   *
+   * https://github.com/yjs/yjs/issues/438
    */
-  console.error('Yjs was already imported. This breaks constructor checks and will lead to isssues!')
+  console.error('Yjs was already imported. This breaks constructor checks and will lead to issues! - https://github.com/yjs/yjs/issues/438')
 }
 glo[importIdentifier] = true

src/utils/UndoManager.js

@@ -139,6 +139,7 @@ const popStackItem = (undoManager, stack, eventType) => {
  * undo/redo scope.
  * @property {Set<any>} [UndoManagerOptions.trackedOrigins=new Set([null])]
  * @property {boolean} [ignoreRemoteMapChanges] Experimental. By default, the UndoManager will never overwrite remote changes. Enable this property to enable overwriting remote changes on key-value changes (Y.Map, properties on Y.Xml, etc..).
+ * @property {Doc} [doc] The document that this UndoManager operates on. Only needed if typeScope is empty.
  */
 
 /**
@@ -160,7 +161,8 @@ export class UndoManager extends Observable {
     captureTransaction = tr => true,
     deleteFilter = () => true,
     trackedOrigins = new Set([null]),
-    ignoreRemoteMapChanges = false
+    ignoreRemoteMapChanges = false,
+    doc = /** @type {Doc} */ (array.isArray(typeScope) ? typeScope[0].doc : typeScope.doc)
   } = {}) {
     super()
     /**
@@ -187,7 +189,7 @@ export class UndoManager extends Observable {
      */
     this.undoing = false
     this.redoing = false
-    this.doc = /** @type {Doc} */ (this.scope[0].doc)
+    this.doc = doc
     this.lastChange = 0
     this.ignoreRemoteMapChanges = ignoreRemoteMapChanges
     /**

tests/undo-redo.tests.js

@@ -49,6 +49,20 @@ export const testUndoText = tc => {
   t.compare(text0.toDelta(), [{ insert: 'b' }, { insert: 'cxy', attributes: { bold: true } }, { insert: 'z' }])
 }
 
+/**
+ * Test case to fix #241
+ * @param {t.TestCase} tc
+ */
+export const testEmptyTypeScope = tc => {
+  const ydoc = new Y.Doc()
+  const um = new Y.UndoManager([], { doc: ydoc })
+  const yarray = ydoc.getArray()
+  um.addToScope(yarray)
+  yarray.insert(0, [1])
+  um.undo()
+  t.assert(yarray.length === 0)
+}
+
 /**
  * Test case to fix #241
  * @param {t.TestCase} tc