/**
 * worker-api.ts
 *
 * Low-level bridge between JavaScript and the OpenSlide WASM module.
 * Runs inside a Web Worker. Handles cwrap binding, memory management,
 * virtual filesystem mounting, and pixel format conversion.
 */
import type { OpenSlideWasmModule, SlideInfo, Dimensions, VirtualFile } from './types.js';
import type { SyncIo } from './io/sync-client.js';
export declare class WorkerApi {
    private mod;
    private fn;
    /** Shared I/O channel; mounts route through the broker when present. */
    private io;
    /** Broker file keys per mount, released on unmount. */
    private brokerMounts;
    constructor(mod: OpenSlideWasmModule, io?: SyncIo | null);
    /** Check for an OpenSlide error after a call and throw if present. */
    private checkError;
    /** Read a NULL-terminated array of C strings from a pointer. */
    private readStringArray;
    /**
     * Copy `pixels` ARGB words from the WASM heap at `ptr` into a fresh
     * (transferable) buffer, converting to straight RGBA in the same pass.
     * The heap view is taken fresh per call — memory growth invalidates
     * earlier views — and the caller must not await between readRegion
     * returning and this copy.
     */
    private copyHeapArgbAsRgba;
    open(path: string): Promise<number>;
    close(handle: number): Promise<void>;
    getSlideInfo(handle: number): Promise<SlideInfo>;
    /**
     * Read a region and return the raw RGBA bytes as a transferable ArrayBuffer.
     */
    readRegion(handle: number, x: number, y: number, level: number, w: number, h: number): Promise<ArrayBuffer>;
    readAssociatedImage(handle: number, name: string): Promise<{
        buffer: ArrayBuffer;
        width: number;
        height: number;
    }>;
    getAssociatedImageDimensions(handle: number, name: string): Promise<Dimensions>;
    detectVendor(path: string): Promise<string | null>;
    getVersion(): Promise<string>;
    getIccProfile(handle: number): Promise<ArrayBuffer | null>;
    mountFiles(files: File[], mountId: string): string;
    /**
     * Mount files with directory structure (for multi-file formats like MRXS).
     *
     * WORKERFS mounts are flat — each mount point gets a set of files with no
     * subdirectories. So we group files by parent directory and create a separate
     * WORKERFS mount for each group. The root dir must be created with mkdir
     * first, then subdirectories get their own WORKERFS mounts.
     *
     * Layout for MRXS "image_1.mrxs" + "image_1/Slidedat.ini" + "image_1/Data0001.dat":
     *   /mnt/<id>/root/       ← WORKERFS mount with [image_1.mrxs]
     *   /mnt/<id>/root/image_1/ ← WORKERFS mount with [Slidedat.ini, Data0001.dat, ...]
     */
    mountDir(entries: VirtualFile[], indexFile: string, mountId: string): string;
    mountUrl(url: string, mountId: string): Promise<string>;
    unmount(mountId: string): void;
}
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