/**
 * openslide.ts
 *
 * Main entry point for the library. Manages a pool of Web Workers,
 * each running an independent WASM instance. Distributes work
 * across workers for parallel tile reads.
 */
import type { OpenSlideOptions, SlideSource } from './types.js';
import { Slide } from './slide.js';
export declare class OpenSlide {
    private workers;
    /** Shared I/O broker worker (block cache + async fetch), if enabled. */
    private broker;
    private nextId;
    private terminated;
    private constructor();
    /**
     * Create and initialize an OpenSlide instance with a worker pool.
     *
     * @param options.workerCount - Number of workers (default: hardwareConcurrency or 4).
     * @param options.wasmUrl - Custom URL to the WASM module JS loader.
     */
    static initialize(options?: OpenSlideOptions): Promise<OpenSlide>;
    /**
     * Open a whole-slide image.
     *
     * Accepts:
     * - A single File (dropped or from file input)
     * - An array of Files (for multi-file formats like MIRAX)
     * - An array of VirtualFile objects (files with relative paths)
     * - A URL object or string URL (fetched via HTTP range requests)
     */
    open(source: SlideSource): Promise<Slide>;
    /**
     * Detect the vendor of a slide file without fully opening it.
     * Returns the vendor string (e.g., "aperio", "hamamatsu") or null.
     */
    detectVendor(source: SlideSource): Promise<string | null>;
    /** Get the OpenSlide library version string. */
    getVersion(): Promise<string>;
    /** Terminate all workers (including the I/O broker). The instance cannot be used after this. */
    terminate(): void;
    private leastBusy;
    private sendTo;
    private createSendFn;
    private generateMountId;
    private ensureAlive;
}
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