NativeScript/nativescript-core/ui/placeholder/index.ts

import { View } from "../core/view";
import { CreateViewEventData } from "./placeholder-common";
import { EventData } from "../../data/observable";

export * from './placeholder-common';

export class Placeholder extends View {
    public static creatingViewEvent = "creatingView";

    public createNativeView() {
        const args = <CreateViewEventData>{ eventName: Placeholder.creatingViewEvent, object: this, view: undefined, context: this._context };
        this.notify(args);

        return args.view;
    }
}
export interface Placeholder {
    on(eventNames: string, callback: (args: EventData) => void);
    on(event: "creatingView", callback: (args: CreateViewEventData) => void);
}