fix: index error and set of root children error

packages/bridge/src/convert/set.ts

@@ -1,4 +1,5 @@
 import * as Automerge from 'automerge'
+import { Operation, Node } from 'slate'
 
 import { toSlatePath, toJS } from '../utils'
 import { rootKey } from './constants'
@@ -19,44 +20,57 @@ const setDataOp = (
   }
 }
 
+const setChildren = (op: Automerge.Diff, doc: any) => (map: any) => {
+  const { value } = op
+
+  const ops: Operation[] = []
+
+  let newValue = map[value]
+  if (!newValue) {
+    return ops
+  }
+
+  // First remove all existing child nodes
+  for (let i = doc.children.length - 1; i >= 0; i--) {
+    ops.push({
+      type: 'remove_node',
+      path: [i],
+      node: doc.children[i]
+    })
+  }
+
+  // Then add all the newly defined nodes
+  const newChildren: Node[] = newValue
+  newChildren.forEach((child, index) => {
+    ops.push({
+      type: 'insert_node',
+      path: [index],
+      node: child
+    })
+  })
+
+  return ops
+}
+
 const opSet = (op: Automerge.Diff, [map, ops]: any, doc: any) => {
   const { link, value, path, obj, key } = op
 
   try {
-    // We can ignore any root level cursor updates since those
-    // will not correspond to any slate operations
-    if (obj === rootKey && key === 'cursors') {
-      return [map, ops]
+    if (map[obj]) {
+      map[obj][key as any] = link ? map[value] : value
     }
 
-    // Handle updates received for the root children array
-    if (obj === rootKey && key === 'children' && map[value]) {
-      // First remove all existing child nodes
-      for (let i = doc.children.length - 1; i >= 0; i--) {
-        ops.push((map: any) => ({
-          type: 'remove_node',
-          path: [i],
-          node: doc.children[i]
-        }))
-      }
-
-      // Then add all the newly defined nodes
-      const newChildren: Node[] = map[value]
-      newChildren.forEach((child, index) => {
-        ops.push((map: any) => ({
-          type: 'insert_node',
-          path: [index],
-          node: child
-        }))
-      })
-
+    // ignore all cursor updates since those do not need to translate into
+    // slate operations
+    if (path && path.includes('cursors')) {
       return [map, ops]
     }
 
-    if (path && path[0] !== 'cursors') {
+    // Handle updates received for the root children array
+    if (obj === rootKey && key === 'children') {
+      ops.push(setChildren(op, doc))
+    } else if (path && obj !== rootKey && !path.includes('cursors')) {
       ops.push(setDataOp(op, doc))
-    } else if (map[obj]) {
-      map[obj][key as any] = link ? map[value] : value
     }
 
     return [map, ops]

packages/bridge/src/path/index.ts

@@ -6,7 +6,11 @@ export const isTree = (node: Node): boolean => Boolean(node?.children)
 
 export const getTarget = (doc: SyncValue | Element, path: Path) => {
   const iterate = (current: any, idx: number) => {
-    if (current === null || !(isTree(current) || current[idx])) {
+    if (current === null || current === undefined) {
+      return null
+    }
+
+    if (!(isTree(current) || current[idx])) {
       return null
     }
 

packages/client/src/client.spec.ts

@@ -2,8 +2,8 @@ import Automerge from 'automerge'
 import { createServer } from 'http'
 import fs from 'fs'
 import isEqual from 'lodash/isEqual'
-import { createEditor, Node, Transforms } from 'slate'
-import { SyncDoc, toJS, toSlateOp } from '@hiveteams/collab-bridge'
+import { createEditor, Editor, Node, Transforms } from 'slate'
+import { createDoc, SyncDoc, toJS, toSlateOp } from '@hiveteams/collab-bridge'
 import AutomergeCollaboration from '@hiveteams/collab-backend/lib/AutomergeCollaboration'
 import withIOCollaboration from './withIOCollaboration'
 import { AutomergeOptions, SocketIOPluginOptions } from './interfaces'
@@ -213,6 +213,23 @@ describe('automerge editor client tests', () => {
     toSlateOp(operations, currentDoc)
   })
 
+  it('should not throw index error', () => {
+    // Read from our test json file for the deep tree error
+    // This allows us to easily reproduce real production errors
+    // and create test cases that resolve those errors
+    const rawData = fs.readFileSync(
+      `${__dirname}/test-json/index-error.json`,
+      'utf-8'
+    )
+    const parsedData = JSON.parse(rawData)
+    const { current, operations } = parsedData
+    const currentDoc = Automerge.load<SyncDoc>(current)
+
+    // ensure no errors throw when removing a deep tree node
+    // that has already been removed
+    toSlateOp(operations, currentDoc)
+  })
+
   it('should update children for a root level children operation', async () => {
     const editor = await createCollabEditor()
 
@@ -233,6 +250,30 @@ describe('automerge editor client tests', () => {
     expect(Node.string(editor.children[1])).toEqual('nodes')
   })
 
+  it('set node for children with missing value should not throw error', () => {
+    const operations: Automerge.Diff[] = [
+      {
+        action: 'set',
+        type: 'map',
+        obj: '00000000-0000-0000-0000-000000000000',
+        key: 'children',
+        path: [],
+        value: '6c7bf8a5-d0e0-4b08-a4a2-32df65b807e5',
+        link: true,
+        conflicts: [
+          {
+            actor: '8c5d5ada-3db9-4189-9e04-2e7c101d057d',
+            value: 'e198d171-a00a-4d5c-a597-c0ff35a7f639',
+            link: true
+          }
+        ]
+      }
+    ]
+
+    const slateOps = toSlateOp(operations, createDoc())
+    expect(slateOps.length).toEqual(0)
+  })
+
   afterAll(() => {
     collabBackend.destroy()
     server.close()