3d-tiles-renderer/src/core/renderer/utilities/Scheduler.d.ts

https://github.com/AnalyticalGraphicsInc/3d-tiles/tree/master/specification

export class Scheduler {

	static setXRSession( session: XRSession ): void;
	static requestAnimationFrame( cb: Function ): number;
	static cancelAnimationFrame( handle: number ): void;
	static flushPending(): void;

}