import type { Milliseconds } from "../semanticTypes";
import type { TimerId } from "./types";
export type WorkerTimerRecord = {
	callback: VoidFunction;
	repeat: boolean;
	delay: Milliseconds;
	startedAt: Milliseconds;
};
export type WorkerTimersBackendHandlers = {
	onReady: VoidFunction;
	onFatalError: (orphaned: Map<TimerId, WorkerTimerRecord>) => void;
};
export declare class WorkerTimersBackend {
	private readonly worker;
	private readonly handlers;
	private readonly records;
	private ticks;
	private constructor();
	static create(handlers: WorkerTimersBackendHandlers): WorkerTimersBackend | null;
	get activeCount(): number;
	get deliveredTicks(): number;
	set(id: TimerId, callback: VoidFunction, delay: Milliseconds, repeat: boolean): void;
	clear(id: TimerId): void;
	destroy(): Map<TimerId, WorkerTimerRecord>;
	private postCommand;
	private handleMessage;
	private handleError;
}