import { EngineConfig, EngineId, VfsBackend } from '../core/types';
import { TexPackagesManifest } from '../core/manifest';
export interface DefaultBackendsOptions {
    /**
     * Leave the manifest's core bundle out of the chain. createEngine() sets
     * this when the engine runs in a worker: the worker builds the BundleFS
     * itself, so the tree is unpacked once, on the side that actually needs it.
     */
    skipManifestBundle?: boolean;
}
/**
 * Build the default backend chain for an engine instance.
 *
 * Order: BundleFS (in-memory core) → OPFS (when in a browser/PWA) → FETCHFS (CDN fallback).
 *
 * The TauriFS backend is *not* installed by default — the consumer opts in via
 * `withTauriFs(...)` from the `texlive-wasm/tauri` entry. That keeps web
 * consumers from picking up a hard dep on @tauri-apps/plugin-fs.
 */
export declare function defaultBackends(_id: EngineId, config: EngineConfig, options?: DefaultBackendsOptions): Promise<VfsBackend[]>;
/**
 * Wrap a backend so every file it serves must hash to what the manifest says.
 * A mismatch is reported as a miss (the next tier answers, or the engine
 * reports the file missing) — never as bytes the engine will interpret.
 *
 * Files the manifest does not list pass through unchecked: the manifest is an
 * index of the TL tree, not an allowlist of everything an app may mount.
 */
export declare function withIntegrity(backend: VfsBackend, manifest: TexPackagesManifest): VfsBackend;
export { createBundleFs } from './bundlefs';
export { createOpfsFs } from './opfsfs';
export { createFetchFs } from './fetchfs';
export { createTauriFs, isTauri, withTauriFs } from './taurifs';
export type { TauriFsOptions } from './taurifs';
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