import { VfsBackend } from '../core/types';
export interface FetchFsOptions {
    cdnBaseUrl: string;
    /** Optional callback fired whenever a file is fetched (for cache write-through). */
    onFetched?: (tdsPath: string, bytes: Uint8Array) => void | Promise<void>;
    /**
     * Integrity gate. Given the TDS path and the fetched bytes, returns false to
     * reject them — the read then reports a miss rather than handing the engine
     * bytes a compromised CDN chose. See withIntegrity() in vfs/index.ts.
     */
    verify?: (tdsPath: string, bytes: Uint8Array) => Promise<boolean> | boolean;
}
export declare function createFetchFs(opts: FetchFsOptions): VfsBackend;
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