Angular ngDoCheck

export class ProductTableComponent {
  constructor(private repository: ProductRepository, differs: IterableDiffers) {
    this.differ = differs.find(this.repository.getProducts()).create();
  }

  dataSource = new MatTableDataSource<Product>(this.repository.getProducts());
  differ: IterableDiffer<Product>;

  ngDoCheck() {
    let changes = this.differ?.diff(this.repository.getProducts());

    // if the data in the repository has been changed, then I refresh the data source, which has the effect of updating the table.
    if (changes != null) {
      this.dataSource.data = this.repository.getProducts();
    }
  }
}

Another way: RxJS