*ngLet Structural Directive

ng-let.directive.ts

export class NgLetContext<T = any> {
  $implicit: T = null!; 
  ngLet: T = null!;
}

@Directive({
  selector: '[ngLet]',
})
export class NgLetDirective<T> implements OnInit {
  private _context = new NgLetContext<T>();

  @Input()
  set ngLet(value: T) {
    this._context.$implicit = this._context.ngLet = value;
  }

  constructor(private _vcr: ViewContainerRef, private _templateRef: TemplateRef<NgLetContext>) {}

  static ngTemplateContextGuard<T>(dir: NgLetDirective<T>, ctx: unknown): ctx is NgLetContext<T> {
    return true;
  }

  ngOnInit() {
    this._vcr.createEmbeddedView(this._templateRef, this._context);
  }
}

/*
 * Used in Template like this:
 *
 * <ng-container *ngLet="(a$| async) as a"> 
 *    one thing: {{ a.one }}
 *    another: {{ a.another }}
 * </ng-container>
 *
 */

Good for when you want to avoid multiple subscriptions but for whatever reason *ngIf won't do the trick.