Third bunch of possible undefined thoughts

src/actions/bulletColor.ts

@@ -29,7 +29,9 @@ export const bulletColorActionCreator =
   (payload: Parameters<typeof bulletColor>[1]): Thunk =>
   (dispatch, getState) => {
     const state = getState()
-    const thought = pathToThought(state, state.cursor!)
+    if (!state.cursor) return
+    const thought = pathToThought(state, state.cursor)
+    if (!thought) return
     const thoughtText = stripTags(thought.value)
     const fullySelected =
       (selection.text()?.length === 0 && thoughtText.length !== 0) || selection.text()?.length === thoughtText.length

src/actions/formatLetterCase.ts

@@ -16,8 +16,8 @@ export const formatLetterCaseActionCreator =
     const cursor = state.cursor
     if (!cursor) return
 
-    const thought = pathToThought(state, cursor)
-    const originalThoughtValue = thought.value
+    const originalThoughtValue = pathToThought(state, cursor)?.value
+    if (originalThoughtValue === undefined) return
 
     const updatedThoughtValue = applyLetterCase(command, originalThoughtValue)
     const simplePath = simplifyPath(state, cursor)

src/actions/formatWithTag.ts

@@ -16,6 +16,7 @@ export const formatWithTagActionCreator =
     const state = getState()
     if (!state.cursor) return
     const thought = pathToThought(state, state.cursor)
+    if (!thought) return
     const simplePath = thoughtToPath(state, thought.id)
     suppressFocusStore.update(true)
 

src/actions/swapNote.ts

@@ -73,15 +73,17 @@ const swapNote = (state: State) => {
             const newRank = getRankAfter(state, appendToPath(simplePath, noteId))
             const note = pathToThought(state, oldPath)
 
-            return reducerFlow([
-              moveThought({ oldPath, newPath, newRank }),
-              // delete =note
-              deleteThought({
-                pathParent: cursor,
-                thoughtId: noteId,
-              }),
-              setCursor({ offset: note.value.length, path: newPath }),
-            ])(state)
+            return note
+              ? reducerFlow([
+                  moveThought({ oldPath, newPath, newRank }),
+                  // delete =note
+                  deleteThought({
+                    pathParent: cursor,
+                    thoughtId: noteId,
+                  }),
+                  setCursor({ offset: note.value.length, path: newPath }),
+                ])(state)
+              : null
           },
         ]
       : // if the cursor thought does not have a note, swap it with its parent's note (or create a note if one does not exist)

src/components/DropHover.tsx

@@ -100,14 +100,15 @@ const DropHoverIfVisible = ({
     // const distance = state.cursor ? Math.max(0, Math.min(MAX_DISTANCE_FROM_CURSOR, state.cursor.length - depth!)) : 0
 
     const value = getThoughtById(state, head(simplePath))?.value
-
+    const prevChild = prevChildId && getThoughtById(state, prevChildId)
     return (
+      value !== undefined &&
       (isThoughtHovering || isSubthoughtsHovering) &&
       draggingThoughtValue &&
       // check if it's alphabetically previous to current thought
       compareReasonable(draggingThoughtValue, value) <= 0 &&
       // check if it's alphabetically next to previous thought if it exists
-      (!prevChildId || compareReasonable(draggingThoughtValue, getThoughtById(state, prevChildId).value) === 1)
+      (!prevChild || compareReasonable(draggingThoughtValue, prevChild.value) === 1)
     )
   })
 

src/hooks/useDragAndDropSubThought.ts

@@ -71,7 +71,7 @@ const canDrop = (props: DroppableSubthoughts, monitor: DropTargetMonitor): boole
   const distance = state.cursor ? state.cursor.length - thoughtsTo.length - 1 : 0
   const isHidden = distance >= visibleDistanceAboveCursor(state) && !isExpandedTop()
   const isDescendant = isDescendantPath(thoughtsTo, thoughtsFrom)
-  const divider = isDivider(getThoughtById(state, head(thoughtsTo)).value)
+  const divider = isDivider(getThoughtById(state, head(thoughtsTo))?.value)
 
   const showContexts = thoughtsTo && isContextViewActive(state, thoughtsTo)
 
@@ -118,13 +118,18 @@ const drop = (props: DroppableSubthoughts, monitor: DropTargetMonitor) => {
   if (equalPath(thoughtsFrom, props.simplePath)) return
 
   // cannot move root or em context or target is divider
-  if (isDivider(thoughtTo.value) || (isRootOrEM && !sameContext)) {
+  if (isDivider(thoughtTo?.value) || (isRootOrEM && !sameContext)) {
     store.dispatch(
       error({ value: `Cannot move the ${isEM(thoughtsFrom) ? 'em' : 'home'} context to another context.` }),
     )
     return
   }
 
+  if (!thoughtTo) {
+    console.warn(`Cannot drop ${thoughtFrom} on itself. Aborting drop.`)
+    return
+  }
+
   store.dispatch(
     moveThought({
       oldPath: thoughtsFrom,
@@ -134,7 +139,7 @@ const drop = (props: DroppableSubthoughts, monitor: DropTargetMonitor) => {
   )
 
   // alert user of move to another context
-  if (!sameContext) {
+  if (!sameContext && thoughtTo && thoughtFrom) {
     // wait until after MultiGesture has cleared the error so this alert does no get cleared
     setTimeout(() => {
       const alertFrom = '"' + ellipsize(thoughtFrom.value) + '"'

src/initialize.ts

@@ -205,7 +205,10 @@ const windowEm = {
   getLexeme: withState(getLexeme),
   getLexemeContexts: withState((state: State, value: string) => {
     const contexts = getLexeme(state, value)?.contexts || []
-    return contexts.map(id => thoughtToContext(state, getThoughtById(state, id)?.parentId))
+    return contexts
+      .map(id => getThoughtById(state, id))
+      .filter(Boolean)
+      .map(thought => thoughtToContext(state, thought.parentId))
   }),
   getAllChildrenByContext: withState((state: State, context: Context) =>
     getAllChildren(state, contextToThoughtId(state, context) || null),

src/redux-middleware/__tests__/pullQueue.ts

@@ -102,7 +102,7 @@ it('do not repopulate deleted thought', async () => {
   })
 
   const parentEntryChild = contextToThought(store.getState(), [''])
-  expect(parentEntryChild).toBe(null)
+  expect(parentEntryChild).toBe(undefined)
 })
 
 it('load buffered thoughts', async () => {

src/selectors/nextThought.ts

@@ -18,9 +18,9 @@ import parentOf from '../util/parentOf'
 const nextContext = (state: State, path: Path) => {
   // use rootedParentOf(path) instead of thought.parentId since we need to cross the context view
   const parent = getThoughtById(state, head(rootedParentOf(state, path)))
-  const contexts = getContextsSortedAndRanked(state, parent.value)
+  const contexts = parent ? getContextsSortedAndRanked(state, parent.value) : []
   // find the thought in the context view
-  const index = contexts.findIndex(cx => getThoughtById(state, cx.id).parentId === head(path))
+  const index = contexts.findIndex(cx => getThoughtById(state, cx.id)?.parentId === head(path))
   // get the next context
   const nextContextId = contexts[index + 1]?.id
   const nextContext = nextContextId ? getThoughtById(state, nextContextId) : null
@@ -33,11 +33,11 @@ const nextContext = (state: State, path: Path) => {
 /** Gets the first context in a context view. */
 const firstContext = (state: State, path: Path): Path | null => {
   const thought = getThoughtById(state, head(path))
-  const contexts = getContextsSortedAndRanked(state, thought.value)
+  const contexts = thought ? getContextsSortedAndRanked(state, thought.value) : []
 
   // if context view is empty, move to the next thought
   const firstContext = getThoughtById(state, contexts[0]?.id)
-  return contexts.length > 1
+  return firstContext && contexts.length > 1
     ? appendToPath(path, firstContext.parentId)
     : nextThought(state, path, { ignoreChildren: true }) // eslint-disable-line @typescript-eslint/no-use-before-define
 }

src/selectors/parentOfThought.ts

@@ -8,7 +8,7 @@ const parentOfThought = (state: State, thoughtId: ThoughtId): Thought | null =>
   const thought = getThoughtById(state, thoughtId)
   if (!thought) return null
   const parentThought = getThoughtById(state, thought.parentId)
-  return parentThought
+  return parentThought ?? null
 }
 
 export default parentOfThought

src/selectors/prevContext.ts

@@ -9,9 +9,9 @@ import rootedParentOf from './rootedParentOf'
 const prevContext = (state: State, path: Path) => {
   // use rootedParentOf(path) instead of thought.parentId since we need to cross the context view
   const parent = getThoughtById(state, head(rootedParentOf(state, path)))
-  const contexts = getContextsSortedAndRanked(state, parent.value)
+  const contexts = parent ? getContextsSortedAndRanked(state, parent.value) : []
   // find the thought in the context view
-  const index = contexts.findIndex(cx => getThoughtById(state, cx.id).parentId === head(path))
+  const index = contexts.findIndex(cx => getThoughtById(state, cx.id)?.parentId === head(path))
   const context = contexts[index - 1]
   return context ? getThoughtById(state, context.parentId) : null
 }

src/selectors/prevSibling.ts

@@ -27,11 +27,14 @@ export const prevSibling = (
   if (!thought || (!state.showHiddenThoughts && isAttribute(thought.value))) return null
 
   const parentPath = rootedParentOf(state, path)
+  const parent = getThoughtById(state, head(parentPath))
   const showContexts = showContextsForced ?? isContextViewActive(state, parentPath)
 
   // siblings, including the current thought
   const siblings = showContexts
-    ? getContextsSortedAndRanked(state, getThoughtById(state, head(parentPath)).value)
+    ? parent
+      ? getContextsSortedAndRanked(state, parent.value)
+      : []
     : getChildrenSorted(state, thought.parentId)
 
   // in context view, we need to match the context's parentId, since all context's ids refer to lexeme instances
@@ -45,9 +48,10 @@ export const prevSibling = (
   }
 
   const prev = siblings[index - 1]
+  if (!prev) return null
 
   // in context view, we select then parent since prev again refers to the lexeme instance
-  return prev ? (showContexts ? getThoughtById(state, prev.parentId) : prev) : null
+  return showContexts ? (getThoughtById(state, prev.parentId) ?? null) : prev
 }
 
 export default prevSibling

src/stores/commandStateStore.ts

@@ -36,7 +36,7 @@ export const updateCommandState = () => {
   const action =
     selection.isActive() && selection.isOnThought()
       ? getCommandState(selection.html() ?? '')
-      : getCommandState(pathToThought(state, state.cursor).value)
+      : getCommandState(pathToThought(state, state.cursor)?.value ?? '')
   commandStateStore.update(action)
 }
 

src/test-helpers/contextToThought.ts

@@ -7,9 +7,9 @@ import getThoughtById from '../selectors/getThoughtById'
 /**
  * Converts a Context to a Thought. If more than one thought has the same value in the same context, traveerses the first.
  */
-const contextToThought = (state: State, context: Context): Thought | null => {
+const contextToThought = (state: State, context: Context): Thought | undefined => {
   const id = contextToThoughtId(state, context)
-  return id ? getThoughtById(state, id) : null
+  return id ? getThoughtById(state, id) : undefined
 }
 
 export default contextToThought

src/test-helpers/deleteThoughtAtFirstMatch.ts

@@ -19,6 +19,8 @@ const getThoughtAndParentPath = (state: State, at: string[]): [Thought, Path] =>
 
   const thought = pathToThought(state, path)
 
+  if (!thought) throw new Error(`Thought not found for path: ${path}`)
+
   const pathParent = rootedParentOf(state, path)
 
   return [thought, pathParent]
@@ -28,6 +30,7 @@ const getThoughtAndParentPath = (state: State, at: string[]): [Thought, Path] =>
  */
 const deleteThoughtAtFirstMatch = _.curryRight((state: State, at: string[]) => {
   const [thought, pathParent] = getThoughtAndParentPath(state, at)
+
   return deleteThought(state, {
     pathParent,
     thoughtId: thought.id,
@@ -41,6 +44,7 @@ export const deleteThoughtAtFirstMatchActionCreator =
   (at: Context): Thunk =>
   (dispatch, getState) => {
     const [thought, pathParent] = getThoughtAndParentPath(getState(), at)
+
     dispatch(
       deleteThoughtActionCreator({
         pathParent,

src/util/getContextMap.ts

@@ -16,9 +16,10 @@ const getContextMap = (state: State, lexemes: (Lexeme | undefined)[]) =>
       ...acc,
       ...lexeme.contexts.reduce<Index<Context>>((accInner, thoughtId) => {
         const thought = getThoughtById(state, thoughtId)
+        if (!thought) return accInner
         return {
           ...accInner,
-          [thought.parentId]: unroot(thoughtToContext(state, thought.parentId)!),
+          [thought.parentId]: unroot(thoughtToContext(state, thought.parentId)),
         }
       }, {}),
     }),

src/util/importJSON.ts

@@ -63,6 +63,7 @@ const insertThought = (
   },
 ) => {
   const thoughtOld = getThoughtById(state, id)
+  if (!thoughtOld) return null
   const childLastUpdated = block.children[0]?.lastUpdated
   const childCreated = block.children[0]?.created
   const lastUpdatedInherited =
@@ -233,10 +234,10 @@ const importJSON = (
   { lastUpdated = timestamp(), updatedBy = clientId, skipRoot = false }: ImportJSONOptions = {},
 ) => {
   const destThought = pathToThought(state, simplePath)
-  const destEmpty = destThought.value === '' && !anyChild(state, head(simplePath))
+  const destEmpty = destThought?.value === '' && !anyChild(state, head(simplePath))
   // use getNextRank instead of getRankAfter because if dest is not empty then we need to import thoughts inside it
-  const rankStart = destEmpty ? destThought.rank : getNextRank(state, head(simplePath))
-  const rankIncrement = getRankIncrement(state, blocks, destThought, rankStart)
+  const rankStart = destEmpty ? destThought?.rank : getNextRank(state, head(simplePath))
+  const rankIncrement = destEmpty ? getRankIncrement(state, blocks, destThought, rankStart) : 1
   const pathParent = rootedParentOf(state, simplePath)
   const parentId = head(pathParent)
 

src/util/isDivider.ts

@@ -1,4 +1,4 @@
 /** Returns true if the value starts with multiple dashes and should be interpreted as a divider. */
-const isDivider = (s: string | null) => s !== null && (s.startsWith('---') || s.startsWith('—-'))
+const isDivider = (s: string | null | undefined) => s?.startsWith('---') || s?.startsWith('—-')
 
 export default isDivider

src/util/moveLexemeThought.ts

@@ -13,9 +13,9 @@ const moveLexemeThought = (state: State, lexeme: Lexeme, oldRank: number, newRan
       const thought = getThoughtById(state, child)
       return (
         // remove old context
-        (thought.rank !== oldRank || child !== id) &&
+        (thought?.rank !== oldRank || child !== id) &&
         // remove new context with duplicate rank
-        (thought.rank !== newRank || child !== id)
+        (thought?.rank !== newRank || child !== id)
       )
     }),
     // add new context

src/util/noteValue.ts

@@ -9,7 +9,7 @@ const noteValue = (state: State, id: ThoughtId) => {
   const noteId = findDescendant(state, id, '=note')
   if (!noteId) return null
   const noteThought = getThoughtById(state, noteId)
-  if (noteThought.pending) return null
+  if (noteThought?.pending) return null
   return firstVisibleChild(state, noteId!)?.value ?? null
 }
 

src/util/removeDuplicatedContext.ts

@@ -16,7 +16,7 @@ const removeDuplicatedContext = (state: State, lexeme: Lexeme, context: Context)
     ...lexeme,
     contexts: (lexeme.contexts || []).filter(child => {
       const thought = getThoughtById(state, child)
-      return thought.parentId !== contextToThoughtId(state, context)
+      return thought?.parentId !== contextToThoughtId(state, context)
     }),
   }
 }