How to use the @ngrx/data.ofEntityOp function in @ngrx/data

constructor(actions$: Actions, toast: ToastService) {
    actions$
      .pipe(
        ofEntityOp(),
        filter(
          (ea: EntityAction) =>
            ea.payload.entityOp.endsWith(OP_SUCCESS) ||
            ea.payload.entityOp.endsWith(OP_ERROR)
        )
      )
      // this service never dies so no need to unsubscribe
      .subscribe(action =>
        toast.openSnackBar(
          `${action.payload.entityName} action`,
          action.payload.entityOp
        )
      );

    actions$
      .pipe(