/**
 * Shared error for the virtual-module fallbacks (`content`, `search`, `llms`).
 * Each of those modules is replaced at build time by the `docsmith()` Vite
 * plugin; the checked-in file only runs when the plugin is missing, so it
 * throws this clear, actionable message instead of surfacing an empty index.
 */
export declare function missingPluginError(subpath: string): Error;