type predicate

akwasniewski · akwasniewski · commit 9c17a96016bd · 2025-08-04T10:31:26.000+02:00
diff --git a/packages/react-native-gesture-handler/src/web/handlers/GestureHandler.ts b/packages/react-native-gesture-handler/src/web/handlers/GestureHandler.ts
@@ -587,12 +587,15 @@ export default abstract class GestureHandler implements IGestureHandler {
     invokeNullableMethod(onGestureHandlerEvent, cancelEvent);
   }
 
-  protected ensurePropsRef(): void {
+  protected ensurePropsRef(): this is this & {
+    propsRef: React.RefObject<PropsRef>;
+  } {
     if (!this.propsRef) {
       throw new Error(
         tagMessage('Cannot handle event when component props are null')
       );
     }
+    return true;
   }
 
   protected transformNativeEvent(): Record<string, unknown> {

Original file line number	Diff line number	Diff line change
`@@ -587,12 +587,15 @@ export default abstract class GestureHandler implements IGestureHandler {`
`587`	`587`	`invokeNullableMethod(onGestureHandlerEvent, cancelEvent);`
`588`	`588`	`}`
`589`	`589`
`590`		`- protected ensurePropsRef(): void {`
	`590`	`+ protected ensurePropsRef(): this is this & {`
	`591`	`+ propsRef: React.RefObject<PropsRef>;`
	`592`	`+ } {`
`591`	`593`	`if (!this.propsRef) {`
`592`	`594`	`throw new Error(`
`593`	`595`	`tagMessage('Cannot handle event when component props are null')`
`594`	`596`	`);`
`595`	`597`	`}`
	`598`	`+ return true;`
`596`	`599`	`}`
`597`	`600`
`598`	`601`	`protected transformNativeEvent(): Record<string, unknown> {`