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);
}