Add missing null checks to OffscreenInstance code

`stateNode` is any-typed, so when reading from `stateNode` we should always cast
it to the specific type for that type of work. I noticed a place in the commit
phase where OffscreenInstance wasn't being cast. When I added the type
assertion, it exposed some type errors where nullable values were being accessed
without first being refined.

I added the required null checks without verifying the logic of the existing
code. If the existing logic was correct, then the extra null checks won't have
any affect on the behavior, because all they do is refine from a nullable type
to a non-nullable type in places where the type was assumed to already be
non-nullable. But the result looks a bit fishy to me, so I also left behind some
TODOs to follow up and verify it's correct.

packages/react-reconciler/src/ReactFiberCommitWork.new.js

@@ -25,6 +25,7 @@ import type {Wakeable} from 'shared/ReactTypes';
 import type {
   OffscreenState,
   OffscreenInstance,
+  OffscreenQueue,
 } from './ReactFiberOffscreenComponent';
 import type {HookFlags} from './ReactHookEffectTags';
 import type {Cache} from './ReactFiberCacheComponent.new';
@@ -2877,8 +2878,8 @@ function commitPassiveMountOnFiber(
 
       if (enableTransitionTracing) {
         const isFallback = finishedWork.memoizedState;
-        const queue = (finishedWork.updateQueue: any);
-        const instance = finishedWork.stateNode;
+        const queue: OffscreenQueue = (finishedWork.updateQueue: any);
+        const instance: OffscreenInstance = finishedWork.stateNode;
 
         if (queue !== null) {
           if (isFallback) {
@@ -2896,7 +2897,11 @@ function commitPassiveMountOnFiber(
                 // Add all the transitions saved in the update queue during
                 // the render phase (ie the transitions associated with this boundary)
                 // into the transitions set.
-                prevTransitions.add(transition);
+                if (prevTransitions === null) {
+                  // TODO: What if prevTransitions is null?
+                } else {
+                  prevTransitions.add(transition);
+                }
               });
             }
 
@@ -2913,10 +2918,22 @@ function commitPassiveMountOnFiber(
                 // caused them
                 if (markerTransitions !== null) {
                   markerTransitions.forEach(transition => {
-                    if (instance.transitions.has(transition)) {
-                      instance.pendingMarkers.add(
-                        markerInstance.pendingSuspenseBoundaries,
-                      );
+                    if (instance.transitions === null) {
+                      // TODO: What if instance.transitions is null?
+                    } else {
+                      if (instance.transitions.has(transition)) {
+                        if (
+                          instance.pendingMarkers === null ||
+                          markerInstance.pendingSuspenseBoundaries === null
+                        ) {
+                          // TODO: What if instance.pendingMarkers is null?
+                          // TODO: What if markerInstance.pendingSuspenseBoundaries is null?
+                        } else {
+                          instance.pendingMarkers.add(
+                            markerInstance.pendingSuspenseBoundaries,
+                          );
+                        }
+                      }
                     }
                   });
                 }

packages/react-reconciler/src/ReactFiberCommitWork.old.js

@@ -25,6 +25,7 @@ import type {Wakeable} from 'shared/ReactTypes';
 import type {
   OffscreenState,
   OffscreenInstance,
+  OffscreenQueue,
 } from './ReactFiberOffscreenComponent';
 import type {HookFlags} from './ReactHookEffectTags';
 import type {Cache} from './ReactFiberCacheComponent.old';
@@ -2877,8 +2878,8 @@ function commitPassiveMountOnFiber(
 
       if (enableTransitionTracing) {
         const isFallback = finishedWork.memoizedState;
-        const queue = (finishedWork.updateQueue: any);
-        const instance = finishedWork.stateNode;
+        const queue: OffscreenQueue = (finishedWork.updateQueue: any);
+        const instance: OffscreenInstance = finishedWork.stateNode;
 
         if (queue !== null) {
           if (isFallback) {
@@ -2896,7 +2897,11 @@ function commitPassiveMountOnFiber(
                 // Add all the transitions saved in the update queue during
                 // the render phase (ie the transitions associated with this boundary)
                 // into the transitions set.
-                prevTransitions.add(transition);
+                if (prevTransitions === null) {
+                  // TODO: What if prevTransitions is null?
+                } else {
+                  prevTransitions.add(transition);
+                }
               });
             }
 
@@ -2913,10 +2918,22 @@ function commitPassiveMountOnFiber(
                 // caused them
                 if (markerTransitions !== null) {
                   markerTransitions.forEach(transition => {
-                    if (instance.transitions.has(transition)) {
-                      instance.pendingMarkers.add(
-                        markerInstance.pendingSuspenseBoundaries,
-                      );
+                    if (instance.transitions === null) {
+                      // TODO: What if instance.transitions is null?
+                    } else {
+                      if (instance.transitions.has(transition)) {
+                        if (
+                          instance.pendingMarkers === null ||
+                          markerInstance.pendingSuspenseBoundaries === null
+                        ) {
+                          // TODO: What if instance.pendingMarkers is null?
+                          // TODO: What if markerInstance.pendingSuspenseBoundaries is null?
+                        } else {
+                          instance.pendingMarkers.add(
+                            markerInstance.pendingSuspenseBoundaries,
+                          );
+                        }
+                      }
                     }
                   });
                 }

packages/react-reconciler/src/ReactFiberTracingMarkerComponent.new.js

@@ -43,7 +43,7 @@ export type BatchConfigTransition = {
 export type TracingMarkerInstance = {|
   pendingSuspenseBoundaries: PendingSuspenseBoundaries | null,
   transitions: Set<Transition> | null,
-|} | null;
+|};
 
 export type PendingSuspenseBoundaries = Map<OffscreenInstance, SuspenseInfo>;
 

packages/react-reconciler/src/ReactFiberTracingMarkerComponent.old.js

@@ -43,7 +43,7 @@ export type BatchConfigTransition = {
 export type TracingMarkerInstance = {|
   pendingSuspenseBoundaries: PendingSuspenseBoundaries | null,
   transitions: Set<Transition> | null,
-|} | null;
+|};
 
 export type PendingSuspenseBoundaries = Map<OffscreenInstance, SuspenseInfo>;