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fix(core): ViewContainerRef.indexOf doesn't throw error when empty #13220

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fix(core): ViewContainerRef.indexOf doesn't throw error when empty #13220

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5 changes: 3 additions & 2 deletions modules/@angular/core/src/linker/view_container_ref.ts
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Expand Up @@ -187,7 +187,8 @@ export class ViewContainerRef_ implements ViewContainerRef {
}

indexOf(viewRef: ViewRef): number {
return this._element.nestedViews.indexOf((<ViewRef_<any>>viewRef).internalView);
return this.length ? this._element.nestedViews.indexOf((<ViewRef_<any>>viewRef).internalView) :
-1;
}

/** @internal */
Expand All @@ -214,7 +215,7 @@ export class ViewContainerRef_ implements ViewContainerRef {
return wtfLeave(s, view.ref);
}

clear() {
clear(): void {
for (let i = this.length - 1; i >= 0; i--) {
this.remove(i);
}
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