/**
 * Virtual-host fetch shim.
 *
 * The libxslt-wasm build is compiled with FILESYSTEM=0, so libxml2 cannot
 * touch the real filesystem: any `file://` URL aborts inside the WASM sandbox.
 * Instead, every external resource load (stylesheet imports, DTD entities,
 * xi:includes, the publication file, `document()` calls) is routed through the
 * *global* `fetch` via a JSPI-suspended import. That makes resource loading
 * fully controllable from JavaScript: we register fake hosts under the
 * reserved `.invalid` TLD and serve them from local directories or in-memory
 * strings. No HTTP server, no real network traffic.
 */
/**
 * Reads `relPath` (posix, leading "/") beneath mount root `root`, or resolves
 * `undefined` when it is missing or escapes the mount. `root` is opaque: a
 * directory under Node, a base URL in a browser, whatever an embedder's own
 * reader wants.
 */
export type MountReader = (root: string, relPath: string) => Promise<Uint8Array | string | undefined>;
/**
 * Replace how mounted files are read. Lets an embedder serve the stylesheets
 * from somewhere the platform seam does not cover — an in-memory map, a zip,
 * a VS Code webview resource URI — without patching `globalThis.fetch`.
 * Also how scripts/build-xsl-bundle.mjs records which files a render touches.
 */
export declare function setMountReader(reader: MountReader): void;
/** Install the shim (idempotent). Must run before libxslt-wasm loads anything. */
export declare function installFetchShim(): void;
/**
 * Serve `dir` under a unique fake origin. Returns the base URL
 * (e.g. `http://mnt1.ptx.invalid`); resource paths append to it.
 *
 * `dir` is stored verbatim and handed back to the {@link MountReader}, which
 * owns its interpretation — under Node a directory path, in a browser a base
 * URL.
 */
export declare function mountDirectory(dir: string): string;
export declare function unmountDirectory(baseUrl: string): void;
/** Serve `content` for exactly `url`. Takes priority over directory mounts. */
export declare function setVirtualFile(url: string, content: string): void;
export declare function removeVirtualFile(url: string): void;