How to use the nativescript-angular/element-registry.isKnownView function in nativescript-angular

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import { NgModule } from "@angular/core";
import { FormsModule } from "@angular/forms";

import { isKnownView, registerElement } from "nativescript-angular/element-registry";
import { NativeScriptFormsModule } from "nativescript-angular/forms";

import { MaskedTextValueAccessor } from "./masked-text-value-accessor";

if (!isKnownView("MaskedTextField")) {
    registerElement("MaskedTextField", () => require("../masked-text-field").MaskedTextField);
}

@NgModule({
    declarations: [
        MaskedTextValueAccessor
    ],
    providers: [],
    imports: [
        FormsModule,
        NativeScriptFormsModule
    ],
    exports: [
        FormsModule,
        MaskedTextValueAccessor
    ]

export class GridViewComponent extends TemplatedItemsComponent {
    public get nativeElement(): GridView {
        return this.templatedItemsView;
    }

    protected templatedItemsView: GridView;

    constructor(
        _elementRef: ElementRef,
        _iterableDiffers: IterableDiffers) {
        super(_elementRef, _iterableDiffers);
        
    }
}

if (!isKnownView("GridView")) {
    registerElement("GridView", () => GridView);
}