/**
 * io/fs-mount.ts
 *
 * Broker-backed file nodes for the Emscripten FS, replacing createLazyFile's
 * sync-XHR/byte-at-a-time read path and WORKERFS's uncached FileReaderSync
 * reads. A node is created via FS.createLazyFile (never triggering its lazy
 * fetch), then its `contents` is swapped for a `{ length }` facade (the
 * non-configurable `usedBytes` getter reads it, keeping stat sizes right)
 * and its `stream_ops` replaced with bulk block-copy reads served by the
 * SyncIo channel. Nodes are read-only: created with canWrite=false and no
 * `write` stream op, exactly like the legacy mounts.
 */
import { SyncIo } from './sync-client.js';
import type { OpenSlideWasmModule, VirtualFile } from '../types.js';
/** Key under which a local File is cached broker-side; equal Files coming
 *  from several workers (structured clones of the same pick) share it. */
export declare function fileKeyForFile(file: File): string;
export declare function fileKeyForUrl(url: string): string;
/** Create a read-only FS file node whose reads go through the broker. */
export declare function createBrokerFile(mod: OpenSlideWasmModule, parentPath: string, name: string, fileKey: string, size: number, io: SyncIo): void;
/** Mount a remote URL through the broker. Async: stats the URL first. */
export declare function mountUrlViaBroker(mod: OpenSlideWasmModule, url: string, mountId: string, io: SyncIo): Promise<{
    path: string;
    fileKeys: string[];
}>;
/** Mount a flat list of local Files through the broker. */
export declare function mountFilesViaBroker(mod: OpenSlideWasmModule, files: File[], mountId: string, io: SyncIo): {
    path: string;
    fileKeys: string[];
};
/**
 * Mount a multi-file slide (MRXS/VMS/DICOM) through the broker. Unlike the
 * WORKERFS version there is a single MEMFS mount: plain mkdir for the tree,
 * one broker-backed node per file — root files need no special-casing.
 */
export declare function mountDirViaBroker(mod: OpenSlideWasmModule, entries: VirtualFile[], indexFile: string, mountId: string, io: SyncIo): {
    path: string;
    fileKeys: string[];
};
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