import type { ReactNode } from "react";
/**
 * Normalize a user-supplied language hint to a registered highlight.js grammar,
 * or `null` when empty / unknown so callers fall back to plain text.
 */
export declare function normalizeCodeLanguage(value?: string | null): string | null;
/** Best-effort language from a filename / path extension (e.g. `auth.ts` → ts). */
export declare function inferLanguageFromFilename(filename?: string | null): string | null;
/**
 * Syntax-highlight `code` for an already-resolved language, returning React
 * token nodes. Pass a single line to highlight per-line (the annotated-code use)
 * or a whole snippet. Falls back to the raw string for empty / plaintext /
 * unknown languages or any grammar error, so it is always safe to render.
 */
export declare function highlightCode(code: string, language?: string | null): ReactNode;
//# sourceMappingURL=code-highlight.d.ts.map