import type { CreateImageBitmapSupport } from '../lib/validateImageBitmap.js';
import { type TextureData } from '../textures/Texture.js';
type MessageCallback = [(value: any) => void, (reason: any) => void];
export declare class ImageWorkerManager {
    messageManager: Record<number, MessageCallback>;
    workers: Worker[];
    workerLoad: number[];
    nextId: number;
    /** Upper bound on the pool size, from the `numImageWorkers` setting. */
    private readonly maxWorkers;
    /** Retained so the worker source is serialized once, when the pool spawns. */
    private workerBlob;
    private readonly createImageBitmapSupport;
    constructor(numImageWorkers: number, createImageBitmapSupport: CreateImageBitmapSupport);
    /**
     * Build the shared worker source once and spawn the full pool in a single
     * burst. Scheduled from the constructor via `setTimeout`; also called
     * lazily from `getImage` if a request arrives first. No-op once spawned.
     */
    private spawnWorkers;
    private handleMessage;
    private handleWorkerError;
    private createWorkerBlob;
    /**
     * Spawn a single worker from the shared blob and wire up its handlers.
     * No-op once the pool has reached `maxWorkers`.
     */
    private spawnWorker;
    private getNextWorkerIndex;
    getImage(src: string, premultiplyAlpha: boolean | null, sx: number | null, sy: number | null, sw: number | null, sh: number | null): Promise<TextureData>;
}
export {};