13.5.53

docs: fix JSDoc typo

.github/workflows/node.js.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x]
+        node-version: [16.x, 18.x]
 
     steps:
     - uses: actions/checkout@v2
@@ -25,5 +25,7 @@ jobs:
       with:
         node-version: ${{ matrix.node-version }}
     - run: npm ci
-    - run: npm run build --if-present
-    - run: npm test
+    - run: npm run lint
+    - run: npm run test-extensive
+      env:
+        CI: true

.github/workflows/nodejs.yml

@@ -1,31 +0,0 @@
-# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
-# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
-
-name: Node.js CI
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        node-version: [10.x, 12.x, 13.x]
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
-      with:
-        node-version: ${{ matrix.node-version }}
-    - run: npm ci
-    - run: npm run lint
-    - run: npm run test-extensive
-      env:
-        CI: true

package.json

@@ -1,6 +1,6 @@
 {
   "name": "yjs",
-  "version": "13.5.47",
+  "version": "13.5.53",
   "description": "Shared Editing Library",
   "main": "./dist/yjs.cjs",
   "module": "./dist/yjs.mjs",
@@ -75,19 +75,24 @@
   },
   "homepage": "https://docs.yjs.dev",
   "dependencies": {
-    "lib0": "^0.2.49"
+    "lib0": "^0.2.72"
   },
   "devDependencies": {
-    "@rollup/plugin-commonjs": "^17.0.0",
-    "@rollup/plugin-node-resolve": "^11.2.1",
+    "@rollup/plugin-commonjs": "^24.0.1",
+    "@rollup/plugin-node-resolve": "^15.0.1",
+    "@types/node": "^18.15.5",
     "concurrently": "^3.6.1",
-    "typescript": "^4.9.5",
     "http-server": "^0.12.3",
     "jsdoc": "^3.6.7",
     "markdownlint-cli": "^0.23.2",
-    "rollup": "^2.60.0",
+    "rollup": "^3.20.0",
     "standard": "^16.0.4",
     "tui-jsdoc-template": "^1.2.2",
+    "typescript": "^4.9.5",
     "y-protocols": "^1.0.5"
+  },
+  "engines": {
+    "npm": ">=8.0.0",
+    "node": ">=16.0.0"
   }
 }

rollup.config.js

@@ -42,13 +42,7 @@ export default [{
     name: 'Y',
     file: 'dist/yjs.cjs',
     format: 'cjs',
-    sourcemap: true,
-    paths: path => {
-      if (/^lib0\//.test(path)) {
-        return `lib0/dist/${path.slice(5)}.cjs`
-      }
-      return path
-    }
+    sourcemap: true
   },
   external: id => /^lib0\//.test(id)
 }, {
@@ -88,7 +82,7 @@ export default [{
   plugins: [
     debugResolve,
     nodeResolve({
-      mainFields: ['module', 'browser', 'main']
+      mainFields: ['browser', 'module', 'main']
     }),
     commonjs()
   ]
@@ -103,9 +97,10 @@ export default [{
   plugins: [
     debugResolve,
     nodeResolve({
-      mainFields: ['module', 'main']
+      mainFields: ['node', 'module', 'main'],
+      exportConditions: ['node', 'module', 'import', 'default']
     }),
     commonjs()
   ],
-  external: ['isomorphic.js']
+  external: id => /^lib0\//.test(id)
 }]

src/structs/Item.js

@@ -23,11 +23,12 @@ import {
   readContentType,
   addChangedTypeToTransaction,
   isDeleted,
-  DeleteSet, UpdateDecoderV1, UpdateDecoderV2, UpdateEncoderV1, UpdateEncoderV2, ContentType, ContentDeleted, StructStore, ID, AbstractType, Transaction // eslint-disable-line
+  StackItem, DeleteSet, UpdateDecoderV1, UpdateDecoderV2, UpdateEncoderV1, UpdateEncoderV2, ContentType, ContentDeleted, StructStore, ID, AbstractType, Transaction // eslint-disable-line
 } from '../internals.js'
 
 import * as error from 'lib0/error'
 import * as binary from 'lib0/binary'
+import * as array from 'lib0/array'
 
 /**
  * @todo This should return several items
@@ -120,6 +121,12 @@ export const splitItem = (transaction, leftItem, diff) => {
   return rightItem
 }
 
+/**
+ * @param {Array<StackItem>} stack
+ * @param {ID} id
+ */
+const isDeletedByUndoStack = (stack, id) => array.some(stack, /** @param {StackItem} s */ s => isDeleted(s.deletions, id))
+
 /**
  * Redoes the effect of this operation.
  *
@@ -128,12 +135,13 @@ export const splitItem = (transaction, leftItem, diff) => {
  * @param {Set<Item>} redoitems
  * @param {DeleteSet} itemsToDelete
  * @param {boolean} ignoreRemoteMapChanges
+ * @param {import('../utils/UndoManager.js').UndoManager} um
  *
  * @return {Item|null}
  *
  * @private
  */
-export const redoItem = (transaction, item, redoitems, itemsToDelete, ignoreRemoteMapChanges) => {
+export const redoItem = (transaction, item, redoitems, itemsToDelete, ignoreRemoteMapChanges, um) => {
   const doc = transaction.doc
   const store = doc.store
   const ownClientID = doc.clientID
@@ -153,7 +161,7 @@ export const redoItem = (transaction, item, redoitems, itemsToDelete, ignoreRemo
   // make sure that parent is redone
   if (parentItem !== null && parentItem.deleted === true) {
     // try to undo parent if it will be undone anyway
-    if (parentItem.redone === null && (!redoitems.has(parentItem) || redoItem(transaction, parentItem, redoitems, itemsToDelete, ignoreRemoteMapChanges) === null)) {
+    if (parentItem.redone === null && (!redoitems.has(parentItem) || redoItem(transaction, parentItem, redoitems, itemsToDelete, ignoreRemoteMapChanges, um) === null)) {
       return null
     }
     while (parentItem.redone !== null) {
@@ -203,13 +211,10 @@ export const redoItem = (transaction, item, redoitems, itemsToDelete, ignoreRemo
       left = item
       // Iterate right while right is in itemsToDelete
       // If it is intended to delete right while item is redone, we can expect that item should replace right.
-      while (left !== null && left.right !== null && isDeleted(itemsToDelete, left.right.id)) {
+      while (left !== null && left.right !== null && (left.right.redone || isDeleted(itemsToDelete, left.right.id) || isDeletedByUndoStack(um.undoStack, left.right.id) || isDeletedByUndoStack(um.redoStack, left.right.id))) {
         left = left.right
-      }
-      // follow redone
-      // trace redone until parent matches
-      while (left !== null && left.redone !== null) {
-        left = getItemCleanStart(transaction, left.redone)
+        // follow redone
+        while (left.redone) left = getItemCleanStart(transaction, left.redone)
       }
       if (left && left.right !== null) {
         // It is not possible to redo this item because it conflicts with a
@@ -756,48 +761,48 @@ export class AbstractContent {
   }
 
   /**
-   * @param {number} offset
+   * @param {number} _offset
    * @return {AbstractContent}
    */
-  splice (offset) {
+  splice (_offset) {
     throw error.methodUnimplemented()
   }
 
   /**
-   * @param {AbstractContent} right
+   * @param {AbstractContent} _right
    * @return {boolean}
    */
-  mergeWith (right) {
+  mergeWith (_right) {
     throw error.methodUnimplemented()
   }
 
   /**
-   * @param {Transaction} transaction
-   * @param {Item} item
+   * @param {Transaction} _transaction
+   * @param {Item} _item
    */
-  integrate (transaction, item) {
+  integrate (_transaction, _item) {
     throw error.methodUnimplemented()
   }
 
   /**
-   * @param {Transaction} transaction
+   * @param {Transaction} _transaction
    */
-  delete (transaction) {
+  delete (_transaction) {
     throw error.methodUnimplemented()
   }
 
   /**
-   * @param {StructStore} store
+   * @param {StructStore} _store
    */
-  gc (store) {
+  gc (_store) {
     throw error.methodUnimplemented()
   }
 
   /**
-   * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder
-   * @param {number} offset
+   * @param {UpdateEncoderV1 | UpdateEncoderV2} _encoder
+   * @param {number} _offset
    */
-  write (encoder, offset) {
+  write (_encoder, _offset) {
     throw error.methodUnimplemented()
   }
 

src/types/YArray.js

@@ -244,7 +244,7 @@ export class YArray extends AbstractType {
   }
 
   /**
-   * Executes a provided function on once on overy element of this YArray.
+   * Executes a provided function once on overy element of this YArray.
    *
    * @param {function(T,number,YArray<T>):void} f A function to execute on every element of this YArray.
    */

src/types/YText.js

@@ -363,19 +363,26 @@ const formatText = (transaction, parent, currPos, length, attributes) => {
  * @function
  */
 const cleanupFormattingGap = (transaction, start, curr, startAttributes, currAttributes) => {
-  let end = curr
-  const endAttributes = map.copy(currAttributes)
+  /**
+   * @type {Item|null}
+   */
+  let end = start
+  /**
+   * @type {Map<string,ContentFormat>}
+   */
+  const endFormats = map.create()
   while (end && (!end.countable || end.deleted)) {
     if (!end.deleted && end.content.constructor === ContentFormat) {
-      updateCurrentAttributes(endAttributes, /** @type {ContentFormat} */ (end.content))
+      const cf = /** @type {ContentFormat} */ (end.content)
+      endFormats.set(cf.key, cf)
     }
     end = end.right
   }
   let cleanups = 0
-  let reachedEndOfCurr = false
+  let reachedCurr = false
   while (start !== end) {
     if (curr === start) {
-      reachedEndOfCurr = true
+      reachedCurr = true
     }
     if (!start.deleted) {
       const content = start.content
@@ -383,11 +390,11 @@ const cleanupFormattingGap = (transaction, start, curr, startAttributes, currAtt
         case ContentFormat: {
           const { key, value } = /** @type {ContentFormat} */ (content)
           const startAttrValue = startAttributes.get(key) || null
-          if ((endAttributes.get(key) || null) !== value || startAttrValue === value) {
+          if (endFormats.get(key) !== content || startAttrValue === value) {
             // Either this format is overwritten or it is not necessary because the attribute already existed.
             start.delete(transaction)
             cleanups++
-            if (!reachedEndOfCurr && (currAttributes.get(key) || null) === value && (startAttributes.get(key) || null) !== value) {
+            if (!reachedCurr && (currAttributes.get(key) || null) === value && startAttrValue !== value) {
               if (startAttrValue === null) {
                 currAttributes.delete(key)
               } else {
@@ -395,6 +402,9 @@ const cleanupFormattingGap = (transaction, start, curr, startAttributes, currAtt
               }
             }
           }
+          if (!reachedCurr && !start.deleted) {
+            updateCurrentAttributes(currAttributes, /** @type {ContentFormat} */ (content))
+          }
           break
         }
       }
@@ -621,36 +631,39 @@ export class YTextEvent extends YEvent {
             /**
              * @type {any}
              */
-            let op
+            let op = null
             switch (action) {
               case 'delete':
-                op = { delete: deleteLen }
+                if (deleteLen > 0) {
+                  op = { delete: deleteLen }
+                }
                 deleteLen = 0
                 break
               case 'insert':
-                op = { insert }
-                if (currentAttributes.size > 0) {
-                  op.attributes = {}
-                  currentAttributes.forEach((value, key) => {
-                    if (value !== null) {
-                      op.attributes[key] = value
-                    }
-                  })
+                if (typeof insert === 'object' || insert.length > 0) {
+                  op = { insert }
+                  if (currentAttributes.size > 0) {
+                    op.attributes = {}
+                    currentAttributes.forEach((value, key) => {
+                      if (value !== null) {
+                        op.attributes[key] = value
+                      }
+                    })
+                  }
                 }
                 insert = ''
                 break
               case 'retain':
-                op = { retain }
-                if (Object.keys(attributes).length > 0) {
-                  op.attributes = {}
-                  for (const key in attributes) {
-                    op.attributes[key] = attributes[key]
+                if (retain > 0) {
+                  op = { retain }
+                  if (!object.isEmpty(attributes)) {
+                    op.attributes = object.assign({}, attributes)
                   }
                 }
                 retain = 0
                 break
             }
-            delta.push(op)
+            if (op) delta.push(op)
             action = null
           }
         }
@@ -1008,15 +1021,7 @@ export class YText extends AbstractType {
         str = ''
       }
     }
-    // snapshots are merged again after the transaction, so we need to keep the
-    // transalive until we are done
-    transact(doc, transaction => {
-      if (snapshot) {
-        splitSnapshotAffectedStructs(transaction, snapshot)
-      }
-      if (prevSnapshot) {
-        splitSnapshotAffectedStructs(transaction, prevSnapshot)
-      }
+    const computeDelta = () => {
       while (n !== null) {
         if (isVisible(n, snapshot) || (prevSnapshot !== undefined && isVisible(n, prevSnapshot))) {
           switch (n.content.constructor) {
@@ -1069,7 +1074,22 @@ export class YText extends AbstractType {
         n = n.right
       }
       packStr()
-    }, 'cleanup')
+    }
+    if (snapshot || prevSnapshot) {
+      // snapshots are merged again after the transaction, so we need to keep the
+      // transaction alive until we are done
+      transact(doc, transaction => {
+        if (snapshot) {
+          splitSnapshotAffectedStructs(transaction, snapshot)
+        }
+        if (prevSnapshot) {
+          splitSnapshotAffectedStructs(transaction, prevSnapshot)
+        }
+        computeDelta()
+      }, 'cleanup')
+    } else {
+      computeDelta()
+    }
     return ops
   }
 

src/utils/DeleteSet.js

@@ -171,7 +171,7 @@ export const mergeDeleteSets = dss => {
  * @function
  */
 export const addToDeleteSet = (ds, client, clock, length) => {
-  map.setIfUndefined(ds.clients, client, () => []).push(new DeleteItem(clock, length))
+  map.setIfUndefined(ds.clients, client, () => /** @type {Array<DeleteItem>} */ ([])).push(new DeleteItem(clock, length))
 }
 
 export const createDeleteSet = () => new DeleteSet()
@@ -251,7 +251,7 @@ export const readDeleteSet = decoder => {
     const client = decoding.readVarUint(decoder.restDecoder)
     const numberOfDeletes = decoding.readVarUint(decoder.restDecoder)
     if (numberOfDeletes > 0) {
-      const dsField = map.setIfUndefined(ds.clients, client, () => [])
+      const dsField = map.setIfUndefined(ds.clients, client, () => /** @type {Array<DeleteItem>} */ ([]))
       for (let i = 0; i < numberOfDeletes; i++) {
         dsField.push(new DeleteItem(decoder.readDsClock(), decoder.readDsLen()))
       }

src/utils/Doc.js

@@ -156,13 +156,15 @@ export class Doc extends Observable {
    * that happened inside of the transaction are sent as one message to the
    * other peers.
    *
-   * @param {function(Transaction):void} f The function that should be executed as a transaction
+   * @template T
+   * @param {function(Transaction):T} f The function that should be executed as a transaction
    * @param {any} [origin] Origin of who started the transaction. Will be stored on transaction.origin
+   * @return T
    *
    * @public
    */
   transact (f, origin = null) {
-    transact(this, f, origin)
+    return transact(this, f, origin)
   }
 
   /**

src/utils/Transaction.js

@@ -376,15 +376,21 @@ const cleanupTransactions = (transactionCleanups, i) => {
 /**
  * Implements the functionality of `y.transact(()=>{..})`
  *
+ * @template T
  * @param {Doc} doc
- * @param {function(Transaction):void} f
+ * @param {function(Transaction):T} f
  * @param {any} [origin=true]
+ * @return {T}
  *
  * @function
  */
 export const transact = (doc, f, origin = null, local = true) => {
   const transactionCleanups = doc._transactionCleanups
   let initialCall = false
+  /**
+   * @type {any}
+   */
+  let result = null
   if (doc._transaction === null) {
     initialCall = true
     doc._transaction = new Transaction(doc, origin, local)
@@ -395,7 +401,7 @@ export const transact = (doc, f, origin = null, local = true) => {
     doc.emit('beforeTransaction', [doc._transaction, doc])
   }
   try {
-    f(doc._transaction)
+    result = f(doc._transaction)
   } finally {
     if (initialCall) {
       const finishCleanup = doc._transaction === transactionCleanups[0]
@@ -413,4 +419,5 @@ export const transact = (doc, f, origin = null, local = true) => {
       }
     }
   }
+  return result
 }

src/utils/UndoManager.js

@@ -10,14 +10,14 @@ import {
   getItemCleanStart,
   isDeleted,
   addToDeleteSet,
-  Transaction, Doc, Item, GC, DeleteSet, AbstractType, YEvent // eslint-disable-line
+  Transaction, Doc, Item, GC, DeleteSet, AbstractType // eslint-disable-line
 } from '../internals.js'
 
 import * as time from 'lib0/time'
 import * as array from 'lib0/array'
 import { Observable } from 'lib0/observable'
 
-class StackItem {
+export class StackItem {
   /**
    * @param {DeleteSet} deletions
    * @param {DeleteSet} insertions
@@ -101,7 +101,7 @@ const popStackItem = (undoManager, stack, eventType) => {
         }
       })
       itemsToRedo.forEach(struct => {
-        performedChange = redoItem(transaction, struct, itemsToRedo, stackItem.insertions, undoManager.ignoreRemoteMapChanges) !== null || performedChange
+        performedChange = redoItem(transaction, struct, itemsToRedo, stackItem.insertions, undoManager.ignoreRemoteMapChanges, undoManager) !== null || performedChange
       })
       // We want to delete in reverse order so that children are deleted before
       // parents, so we have more information available when items are filtered.
@@ -158,7 +158,7 @@ export class UndoManager extends Observable {
    */
   constructor (typeScope, {
     captureTimeout = 500,
-    captureTransaction = tr => true,
+    captureTransaction = _tr => true,
     deleteFilter = () => true,
     trackedOrigins = new Set([null]),
     ignoreRemoteMapChanges = false,

src/utils/YEvent.js

@@ -130,6 +130,11 @@ export class YEvent {
   }
 
   /**
+   * This is a computed property. Note that this can only be safely computed during the
+   * event call. Computing this property after other changes happened might result in
+   * unexpected behavior (incorrect computation of deltas). A safe way to collect changes
+   * is to store the `changes` or the `delta` object. Avoid storing the `transaction` object.
+   *
    * @type {Array<{insert?: string | Array<any> | object | AbstractType<any>, retain?: number, delete?: number, attributes?: Object<string, any>}>}
    */
   get delta () {
@@ -149,6 +154,11 @@ export class YEvent {
   }
 
   /**
+   * This is a computed property. Note that this can only be safely computed during the
+   * event call. Computing this property after other changes happened might result in
+   * unexpected behavior (incorrect computation of deltas). A safe way to collect changes
+   * is to store the `changes` or the `delta` object. Avoid storing the `transaction` object.
+   *
    * @type {{added:Set<Item>,deleted:Set<Item>,keys:Map<string,{action:'add'|'update'|'delete',oldValue:any}>,delta:Array<{insert?:Array<any>|string, delete?:number, retain?:number}>}}
    */
   get changes () {

tests/doc.tests.js

@@ -2,6 +2,24 @@
 import * as Y from '../src/index.js'
 import * as t from 'lib0/testing'
 
+/**
+ * @param {t.TestCase} _tc
+ */
+export const testAfterTransactionRecursion = _tc => {
+  const ydoc = new Y.Doc()
+  const yxml = ydoc.getXmlFragment('')
+  ydoc.on('afterTransaction', tr => {
+    if (tr.origin === 'test') {
+      yxml.toJSON()
+    }
+  })
+  ydoc.transact(_tr => {
+    for (let i = 0; i < 15000; i++) {
+      yxml.push([new Y.XmlText('a')])
+    }
+  }, 'test')
+}
+
 /**
  * @param {t.TestCase} _tc
  */
@@ -15,7 +33,7 @@ export const testOriginInTransaction = _tc => {
   doc.on('afterTransaction', (tr) => {
     origins.push(tr.origin)
     if (origins.length <= 1) {
-      ytext.toDelta()
+      ytext.toDelta(Y.snapshot(doc)) // adding a snapshot forces toDelta to create a cleanup transaction
       doc.transact(() => {
         ytext.insert(0, 'a')
       }, 'nested')

tests/index.js

@@ -1,3 +1,4 @@
+/* eslint-env node */
 
 import * as map from './y-map.tests.js'
 import * as array from './y-array.tests.js'

tests/testHelper.js

@@ -134,7 +134,7 @@ export class TestYInstance extends Y.Doc {
    * @param {TestYInstance} remoteClient
    */
   _receive (message, remoteClient) {
-    map.setIfUndefined(this.receiving, remoteClient, () => []).push(message)
+    map.setIfUndefined(this.receiving, remoteClient, () => /** @type {Array<Uint8Array>} */ ([])).push(message)
   }
 }
 
@@ -347,7 +347,7 @@ export const compare = users => {
     t.compare(userMapValues[i], userMapValues[i + 1])
     t.compare(userXmlValues[i], userXmlValues[i + 1])
     t.compare(userTextValues[i].map(/** @param {any} a */ a => typeof a.insert === 'string' ? a.insert : ' ').join('').length, users[i].getText('text').length)
-    t.compare(userTextValues[i], userTextValues[i + 1], '', (constructor, a, b) => {
+    t.compare(userTextValues[i], userTextValues[i + 1], '', (_constructor, a, b) => {
       if (a instanceof Y.AbstractType) {
         t.compare(a.toJSON(), b.toJSON())
       } else if (a !== b) {
@@ -370,8 +370,8 @@ export const compare = users => {
 export const compareItemIDs = (a, b) => a === b || (a !== null && b != null && Y.compareIDs(a.id, b.id))
 
 /**
- * @param {import('../src/internals').StructStore} ss1
- * @param {import('../src/internals').StructStore} ss2
+ * @param {import('../src/internals.js').StructStore} ss1
+ * @param {import('../src/internals.js').StructStore} ss2
  */
 export const compareStructStores = (ss1, ss2) => {
   t.assert(ss1.clients.size === ss2.clients.size)
@@ -413,13 +413,13 @@ export const compareStructStores = (ss1, ss2) => {
 }
 
 /**
- * @param {import('../src/internals').DeleteSet} ds1
- * @param {import('../src/internals').DeleteSet} ds2
+ * @param {import('../src/internals.js').DeleteSet} ds1
+ * @param {import('../src/internals.js').DeleteSet} ds2
  */
 export const compareDS = (ds1, ds2) => {
   t.assert(ds1.clients.size === ds2.clients.size)
   ds1.clients.forEach((deleteItems1, client) => {
-    const deleteItems2 = /** @type {Array<import('../src/internals').DeleteItem>} */ (ds2.clients.get(client))
+    const deleteItems2 = /** @type {Array<import('../src/internals.js').DeleteItem>} */ (ds2.clients.get(client))
     t.assert(deleteItems2 !== undefined && deleteItems1.length === deleteItems2.length)
     for (let i = 0; i < deleteItems1.length; i++) {
       const di1 = deleteItems1[i]

tests/undo-redo.tests.js

@@ -1,4 +1,4 @@
-import { init, compare, applyRandomTests, Doc } from './testHelper.js' // eslint-disable-line
+import { init } from './testHelper.js' // eslint-disable-line
 
 import * as Y from '../src/index.js'
 import * as t from 'lib0/testing'
@@ -64,9 +64,9 @@ export const testUndoText = tc => {
 
 /**
  * Test case to fix #241
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testEmptyTypeScope = tc => {
+export const testEmptyTypeScope = _tc => {
   const ydoc = new Y.Doc()
   const um = new Y.UndoManager([], { doc: ydoc })
   const yarray = ydoc.getArray()
@@ -78,9 +78,9 @@ export const testEmptyTypeScope = tc => {
 
 /**
  * Test case to fix #241
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testDoubleUndo = tc => {
+export const testDoubleUndo = _tc => {
   const doc = new Y.Doc()
   const text = doc.getText()
   text.insert(0, '1221')
@@ -316,9 +316,9 @@ export const testUndoDeleteFilter = tc => {
 
 /**
  * This issue has been reported in https://discuss.yjs.dev/t/undomanager-with-external-updates/454/6
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testUndoUntilChangePerformed = tc => {
+export const testUndoUntilChangePerformed = _tc => {
   const doc = new Y.Doc()
   const doc2 = new Y.Doc()
   doc.on('update', update => Y.applyUpdate(doc2, update))
@@ -347,9 +347,9 @@ export const testUndoUntilChangePerformed = tc => {
 
 /**
  * This issue has been reported in https://github.com/yjs/yjs/issues/317
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testUndoNestedUndoIssue = tc => {
+export const testUndoNestedUndoIssue = _tc => {
   const doc = new Y.Doc({ gc: false })
   const design = doc.getMap()
   const undoManager = new Y.UndoManager(design, { captureTimeout: 0 })
@@ -403,9 +403,9 @@ export const testUndoNestedUndoIssue = tc => {
 /**
  * This issue has been reported in https://github.com/yjs/yjs/issues/355
  *
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testConsecutiveRedoBug = tc => {
+export const testConsecutiveRedoBug = _tc => {
   const doc = new Y.Doc()
   const yRoot = doc.getMap()
   const undoMgr = new Y.UndoManager(yRoot)
@@ -454,9 +454,9 @@ export const testConsecutiveRedoBug = tc => {
 /**
  * This issue has been reported in https://github.com/yjs/yjs/issues/304
  *
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testUndoXmlBug = tc => {
+export const testUndoXmlBug = _tc => {
   const origin = 'origin'
   const doc = new Y.Doc()
   const fragment = doc.getXmlFragment('t')
@@ -499,9 +499,9 @@ export const testUndoXmlBug = tc => {
 /**
  * This issue has been reported in https://github.com/yjs/yjs/issues/343
  *
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testUndoBlockBug = tc => {
+export const testUndoBlockBug = _tc => {
   const doc = new Y.Doc({ gc: false })
   const design = doc.getMap()
 
@@ -559,9 +559,9 @@ export const testUndoBlockBug = tc => {
  * Undo text formatting delete should not corrupt peer state.
  *
  * @see https://github.com/yjs/yjs/issues/392
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testUndoDeleteTextFormat = tc => {
+export const testUndoDeleteTextFormat = _tc => {
   const doc = new Y.Doc()
   const text = doc.getText()
   text.insert(0, 'Attack ships on fire off the shoulder of Orion.')
@@ -597,9 +597,9 @@ export const testUndoDeleteTextFormat = tc => {
  * Undo text formatting delete should not corrupt peer state.
  *
  * @see https://github.com/yjs/yjs/issues/392
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testBehaviorOfIgnoreremotemapchangesProperty = tc => {
+export const testBehaviorOfIgnoreremotemapchangesProperty = _tc => {
   const doc = new Y.Doc()
   const doc2 = new Y.Doc()
   doc.on('update', update => Y.applyUpdate(doc2, update, doc))
@@ -620,9 +620,9 @@ export const testBehaviorOfIgnoreremotemapchangesProperty = tc => {
  * Special deletion case.
  *
  * @see https://github.com/yjs/yjs/issues/447
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testSpecialDeletionCase = tc => {
+export const testSpecialDeletionCase = _tc => {
   const origin = 'undoable'
   const doc = new Y.Doc()
   const fragment = doc.getXmlFragment()
@@ -644,3 +644,34 @@ export const testSpecialDeletionCase = tc => {
   undoManager.undo()
   t.compareStrings(fragment.toString(), '<test a="1" b="2"></test>')
 }
+
+/**
+ * Deleted entries in a map should be restored on undo.
+ *
+ * @see https://github.com/yjs/yjs/issues/500
+ * @param {t.TestCase} tc
+ */
+export const testUndoDeleteInMap = (tc) => {
+  const { map0 } = init(tc, { users: 3 })
+  const undoManager = new Y.UndoManager(map0, { captureTimeout: 0 })
+  map0.set('a', 'a')
+  map0.delete('a')
+  map0.set('a', 'b')
+  map0.delete('a')
+  map0.set('a', 'c')
+  map0.delete('a')
+  map0.set('a', 'd')
+  t.compare(map0.toJSON(), { a: 'd' })
+  undoManager.undo()
+  t.compare(map0.toJSON(), {})
+  undoManager.undo()
+  t.compare(map0.toJSON(), { a: 'c' })
+  undoManager.undo()
+  t.compare(map0.toJSON(), {})
+  undoManager.undo()
+  t.compare(map0.toJSON(), { a: 'b' })
+  undoManager.undo()
+  t.compare(map0.toJSON(), {})
+  undoManager.undo()
+  t.compare(map0.toJSON(), { a: 'a' })
+}

tsconfig.json

@@ -1,64 +1,21 @@
 {
   "compilerOptions": {
-    /* Basic Options */
-    "target": "es2018",
-    "lib": ["es2018", "dom"],                             /* Specify library files to be included in the compilation. */
-    "allowJs": true,                       /* Allow javascript files to be compiled. */
-    "checkJs": true,                       /* Report errors in .js files. */
-    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
-    "declaration": true,                   /* Generates corresponding '.d.ts' file. */
-    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
-    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
-    // "outFile": "./dist/yjs.js",                       /* Concatenate and emit output to single file. */
-    "outDir": "./dist",                        /* Redirect output structure to the directory. */
-    "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
-    // "composite": true,                     /* Enable project compilation */
-    // "removeComments": true,                /* Do not emit comments to output. */
-    // "noEmit": true,                        /* Do not emit outputs. */
-    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
-    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
-    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
-
-    /* Strict Type-Checking Options */
-    "strict": true,                           /* Enable all strict type-checking options. */
-    "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    "target": "ES2021",
+    "lib": ["ES2021", "dom"],
+    "module": "node16",
+    "allowJs": true,
+    "checkJs": true,
+    "declaration": true,
+    "declarationMap": true,
+    "outDir": "./dist",
+    "baseUrl": "./",
     "emitDeclarationOnly": true,
-    // "strictNullChecks": true,              /* Enable strict null checks. */
-    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
-    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
-    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
-    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
-
-    /* Additional Checks */
-    // "noUnusedLocals": true,                /* Report errors on unused locals. */
-    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
-    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
-    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
-
-    /* Module Resolution Options */
-    "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
-    "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    "strict": true,
+    "noImplicitAny": true,
+    "moduleResolution": "nodenext",
     "paths": {
       "yjs": ["./src/index.js"]
-    },                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
-    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
-    // "typeRoots": [],                       /* List of folders to include type definitions from. */
-    // "types": [],                           /* Type declaration files to be included in compilation. */
-    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
-    "esModuleInterop": true,                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
-    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
-
-    /* Source Map Options */
-    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
-    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
-    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
-    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
-
-    /* Experimental Options */
-    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
-    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
-    // "maxNodeModuleJsDepth": 0,
-    // "types": ["./src/utils/typedefs.js"]
+    }
   },
   "include": ["./src/**/*.js", "./tests/**/*.js"]
 }