Prevent race conditions

src/ckeditor.tsx

@@ -22,7 +22,7 @@ import type {
 import type { EditorSemaphoreMountResult } from './lifecycle/LifeCycleEditorSemaphore';
 
 import { uid } from './utils/uid';
-import { ContextWatchdogContext, isContextWatchdogValueWithStatus } from './ckeditorcontext';
+import { ContextWatchdogContext, isContextWatchdogValueWithStatus, isContextWatchdogReadyToUse } from './ckeditorcontext';
 import { LifeCycleElementSemaphore } from './lifecycle/LifeCycleElementSemaphore';
 
 const REACT_INTEGRATION_READ_ONLY_LOCK_ID = 'Lock from React integration (@ckeditor/ckeditor5-react)';
@@ -225,7 +225,7 @@ export default class CKEditor<TEditor extends Editor> extends React.Component<Pr
 		const watchdog = ( () => {
 			// There is small delay where React did not update the context yet but watchdog is already destroyed.
 			// However editor should be created again in such case, after receiving new context.
-			if ( isContextWatchdogValueWithStatus( 'initialized', this.context ) && this.context.watchdog.state !== 'destroyed' ) {
+			if ( isContextWatchdogReadyToUse( this.context ) ) {
 				return new EditorWatchdogAdapter( this.context.watchdog );
 			}
 

src/ckeditorcontext.tsx

@@ -173,6 +173,16 @@ export const isContextWatchdogValueWithStatus = <S extends ContextWatchdogValueS
 	obj is ExtractContextWatchdogValueByStatus<S> =>
 		isContextWatchdogValue( obj ) && obj.status === status;
 
+/**
+ * Checks if the provided object is a fully initialized context watchdog value. It prevents race conditions between
+ * watchdog state that is not fully synchronized with the context state. For example, the watchdog state can be 'destroyed'
+ * while the context is still being initialized because context setState is pending.
+ */
+export const isContextWatchdogReadyToUse = ( obj: any ): obj is ExtractContextWatchdogValueByStatus<'initialized'> => (
+	isContextWatchdogValueWithStatus( 'initialized', obj ) &&
+	obj.watchdog.state === 'ready'
+);
+
 /**
  * Represents the value of the ContextWatchdog in the CKEditor context.
  */