changed Transitions type to Array<Transition> (#24249)

Changed the Transitions type to Array<Transition> because Transitions was confusing

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

@@ -8,10 +8,7 @@
  */
 
 import type {FiberRoot} from './ReactInternalTypes';
-import type {
-  Transition,
-  Transitions,
-} from './ReactFiberTracingMarkerComponent.new';
+import type {Transition} from './ReactFiberTracingMarkerComponent.new';
 
 // TODO: Ideally these types would be opaque but that doesn't work well with
 // our reconciler fork infra, since these leak into non-reconciler packages.
@@ -824,7 +821,7 @@ export function addTransitionToLanesMap(
 export function getTransitionsForLanes(
   root: FiberRoot,
   lanes: Lane | Lanes,
-): Transitions | null {
+): Array<Transition> | null {
   if (!enableTransitionTracing) {
     return null;
   }

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

@@ -8,10 +8,7 @@
  */
 
 import type {FiberRoot} from './ReactInternalTypes';
-import type {
-  Transition,
-  Transitions,
-} from './ReactFiberTracingMarkerComponent.old';
+import type {Transition} from './ReactFiberTracingMarkerComponent.old';
 
 // TODO: Ideally these types would be opaque but that doesn't work well with
 // our reconciler fork infra, since these leak into non-reconciler packages.
@@ -824,7 +821,7 @@ export function addTransitionToLanesMap(
 export function getTransitionsForLanes(
   root: FiberRoot,
   lanes: Lane | Lanes,
-): Transitions | null {
+): Array<Transition> | null {
   if (!enableTransitionTracing) {
     return null;
   }

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

@@ -15,7 +15,7 @@ import type {
 } from './ReactInternalTypes';
 import type {RootTag} from './ReactRootTags';
 import type {Cache} from './ReactFiberCacheComponent.new';
-import type {Transitions} from './ReactFiberTracingMarkerComponent.new';
+import type {Transition} from './ReactFiberTracingMarkerComponent.new';
 
 import {noTimeout, supportsHydration} from './ReactFiberHostConfig';
 import {createHostRootFiber} from './ReactFiber.new';
@@ -42,7 +42,7 @@ export type RootState = {
   element: any,
   isDehydrated: boolean,
   cache: Cache,
-  transitions: Transitions | null,
+  transitions: Array<Transition> | null,
 };
 
 function FiberRootNode(

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

@@ -15,7 +15,7 @@ import type {
 } from './ReactInternalTypes';
 import type {RootTag} from './ReactRootTags';
 import type {Cache} from './ReactFiberCacheComponent.old';
-import type {Transitions} from './ReactFiberTracingMarkerComponent.old';
+import type {Transition} from './ReactFiberTracingMarkerComponent.old';
 
 import {noTimeout, supportsHydration} from './ReactFiberHostConfig';
 import {createHostRootFiber} from './ReactFiber.old';
@@ -42,7 +42,7 @@ export type RootState = {
   element: any,
   isDehydrated: boolean,
   cache: Cache,
-  transitions: Transitions | null,
+  transitions: Array<Transition> | null,
 };
 
 function FiberRootNode(

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

@@ -34,8 +34,6 @@ export type BatchConfigTransition = {
   _updatedFibers?: Set<Fiber>,
 };
 
-export type Transitions = Array<Transition> | null;
-
 export type TransitionCallback = 0 | 1;
 
 export const TransitionStart = 0;

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

@@ -34,8 +34,6 @@ export type BatchConfigTransition = {
   _updatedFibers?: Set<Fiber>,
 };
 
-export type Transitions = Array<Transition> | null;
-
 export type TransitionCallback = 0 | 1;
 
 export const TransitionStart = 0;

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

@@ -18,7 +18,7 @@ import type {EventPriority} from './ReactEventPriorities.new';
 import type {
   PendingTransitionCallbacks,
   TransitionObject,
-  Transitions,
+  Transition,
 } from './ReactFiberTracingMarkerComponent.new';
 
 import {
@@ -325,7 +325,7 @@ let workInProgressRootRenderTargetTime: number = Infinity;
 // suspense heuristics and opt out of rendering more content.
 const RENDER_TIMEOUT_MS = 500;
 
-let workInProgressTransitions: Transitions | null = null;
+let workInProgressTransitions: Array<Transition> | null = null;
 export function getWorkInProgressTransitions() {
   return workInProgressTransitions;
 }

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

@@ -18,7 +18,7 @@ import type {EventPriority} from './ReactEventPriorities.old';
 import type {
   PendingTransitionCallbacks,
   TransitionObject,
-  Transitions,
+  Transition,
 } from './ReactFiberTracingMarkerComponent.old';
 
 import {
@@ -325,7 +325,7 @@ let workInProgressRootRenderTargetTime: number = Infinity;
 // suspense heuristics and opt out of rendering more content.
 const RENDER_TIMEOUT_MS = 500;
 
-let workInProgressTransitions: Transitions | null = null;
+let workInProgressTransitions: Array<Transition> | null = null;
 export function getWorkInProgressTransitions() {
   return workInProgressTransitions;
 }

packages/react-reconciler/src/ReactInternalTypes.js

@@ -26,7 +26,7 @@ import type {Lane, Lanes, LaneMap} from './ReactFiberLane.old';
 import type {RootTag} from './ReactRootTags';
 import type {TimeoutHandle, NoTimeout} from './ReactFiberHostConfig';
 import type {Cache} from './ReactFiberCacheComponent.old';
-import type {Transitions} from './ReactFiberTracingMarkerComponent.new';
+import type {Transition} from './ReactFiberTracingMarkerComponent.new';
 
 // Unwind Circular: moved from ReactFiberHooks.old
 export type HookType =
@@ -320,7 +320,7 @@ export type TransitionTracingCallbacks = {
 // The following fields are only used in transition tracing in Profile builds
 type TransitionTracingOnlyFiberRootProperties = {|
   transitionCallbacks: null | TransitionTracingCallbacks,
-  transitionLanes: Array<Transitions>,
+  transitionLanes: Array<Array<Transition> | null>,
 |};
 
 // Exported FiberRoot type includes all properties,