Remove REACT_OFFSCREEN_TYPE

Author: rickhanlonii

packages/react-reconciler/src/ReactFiber.js

@@ -103,7 +103,6 @@ import {
   REACT_MEMO_TYPE,
   REACT_LAZY_TYPE,
   REACT_SCOPE_TYPE,
-  REACT_OFFSCREEN_TYPE,
   REACT_LEGACY_HIDDEN_TYPE,
   REACT_TRACING_MARKER_TYPE,
   REACT_ELEMENT_TYPE,
@@ -614,8 +613,6 @@ export function createFiberFromTypeAndProps(
         return createFiberFromSuspense(pendingProps, mode, lanes, key);
       case REACT_SUSPENSE_LIST_TYPE:
         return createFiberFromSuspenseList(pendingProps, mode, lanes, key);
-      case REACT_OFFSCREEN_TYPE:
-        return createFiberFromOffscreen(pendingProps, mode, lanes, key);
       case REACT_LEGACY_HIDDEN_TYPE:
         if (enableLegacyHidden) {
           return createFiberFromLegacyHidden(pendingProps, mode, lanes, key);
@@ -854,7 +851,6 @@ export function createFiberFromOffscreen(
   key: null | string,
 ): Fiber {
   const fiber = createFiber(OffscreenComponent, pendingProps, key, mode);
-  fiber.elementType = REACT_OFFSCREEN_TYPE;
   fiber.lanes = lanes;
   const primaryChildInstance: OffscreenInstance = {
     _visibility: OffscreenVisible,

packages/shared/ReactSymbols.js

@@ -33,7 +33,6 @@ export const REACT_SUSPENSE_LIST_TYPE: symbol = Symbol.for(
 export const REACT_MEMO_TYPE: symbol = Symbol.for('react.memo');
 export const REACT_LAZY_TYPE: symbol = Symbol.for('react.lazy');
 export const REACT_SCOPE_TYPE: symbol = Symbol.for('react.scope');
-export const REACT_OFFSCREEN_TYPE: symbol = Symbol.for('react.offscreen');
 export const REACT_ACTIVITY_TYPE: symbol = Symbol.for('react.activity');
 export const REACT_LEGACY_HIDDEN_TYPE: symbol = Symbol.for(
   'react.legacy_hidden',

packages/shared/isValidElementType.js

@@ -21,7 +21,6 @@ import {
   REACT_LAZY_TYPE,
   REACT_SCOPE_TYPE,
   REACT_LEGACY_HIDDEN_TYPE,
-  REACT_OFFSCREEN_TYPE,
   REACT_TRACING_MARKER_TYPE,
   REACT_VIEW_TRANSITION_TYPE,
   REACT_ACTIVITY_TYPE,
@@ -52,7 +51,6 @@ export default function isValidElementType(type: mixed): boolean {
     type === REACT_SUSPENSE_LIST_TYPE ||
     (enableLegacyHidden && type === REACT_LEGACY_HIDDEN_TYPE) ||
     type === REACT_ACTIVITY_TYPE ||
-    type === REACT_OFFSCREEN_TYPE ||
     (enableScopeAPI && type === REACT_SCOPE_TYPE) ||
     (enableTransitionTracing && type === REACT_TRACING_MARKER_TYPE) ||
     (enableViewTransition && type === REACT_VIEW_TRANSITION_TYPE)