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public readonly headerCellResizes: Observable<TsHeaderCellResizeEvent> | Observable<{}> = defer(() => {
if (this.headerCells && this.headerCells.length) {
return merge( => cell.resized));
// If there are any subscribers before `ngAfterViewInit`, `headerCells` may be undefined.
// In that case, return a stream that we'll replace with the real one once everything is in place.
return this.ngZone.onStable
.pipe(take(1), switchMap(() => this.headerCellResizes));
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