import ImageTile from "ol/ImageTile";
export declare class TileLoadManager {
    private static instance;
    private readonly MAX_CONCURRENT;
    private readonly TIMEOUT;
    private readonly MAX_RETRY;
    private currentLoads;
    private loadQueue;
    private destroyed;
    private readonly MAX_QUEUE_LENGTH;
    private activeControllers;
    private constructor();
    static getInstance(): TileLoadManager;
    createLoadFunction(): (tile: ImageTile, src: string) => void;
    private enqueueLoad;
    private executeWithRetry;
    private executeWithCount;
    private processQueue;
    private executeLoad;
    private handleTimeout;
    destroy(): void;
}