/**
 * Check that `file` is the archive `pin` names, and mount it; or throw an
 * error whose `reasons` say why not.
 */
export declare function mountPinned(file: string, pin: string, { by, at }: {
    /** Who pins it, as a refusal says: `this app`, `@ordner.fyi/suite's parts`. */
    by: string;
    /** Where to mount it — the mount point another thread has it at. */
    at?: string | undefined;
}): {
    root: string;
};
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