import type { CancellationToken } from "@surface/core";
export default class Scheduler {
    private readonly errors;
    private readonly highPriorityQueue;
    private readonly lowPriorityQueue;
    private readonly normalPriorityQueue;
    private readonly timeout;
    private currentExecution;
    private running;
    constructor(timeout: number);
    private nextFrame;
    private processQueue;
    private execute;
    private start;
    private stop;
    enqueue<T>(task: () => T, priority: "high" | "normal" | "low"): Promise<T>;
    enqueue<T>(task: () => T, priority: "high" | "normal" | "low", cancellationToken: CancellationToken): Promise<T | undefined>;
    execution(): Promise<void>;
}