export declare function hljsLanguageForTarget(target: string): string;
export declare function isHljsLanguageReady(hljsName: string): boolean;
/** Registers a highlight.js grammar on first use. No-op if already
 * registered, if it's "plaintext" (needs no registration), or if there's no
 * loader for it (CodeBlock falls back to unhighlighted text in that case). */
export declare function ensureHljsLanguage(hljsName: string): Promise<void>;