export interface Token {
    text: string;
    color?: string | undefined;
    dim?: boolean | undefined;
    bold?: boolean | undefined;
}
export type Lang = 'ts' | 'js' | 'json' | 'bash' | 'python' | 'diff' | 'plain';
/** Carry state for constructs that span lines (block comments, triple strings). */
export interface HLState {
    block?: boolean | undefined;
    triple?: string | null;
}
/**
 * Highlight ONE line. `carry` threads multi-line state (block comments, triple
 * strings) from the previous line; pass the returned `carry` into the next call.
 * Guarantees `result.tokens.map(t=>t.text).join('') === line`.
 */
export declare function highlightLine(line: string, lang: Lang, carry?: HLState): {
    tokens: Token[];
    carry: HLState;
};
/** Map a code-fence info string (```ts, ```bash, …) to a supported Lang. */
export declare function detectLang(fenceInfo: string): Lang;
/**
 * Infer a supported Lang from a file path's extension (`foo/bar.tsx` → `ts`).
 * Used by diff rendering to syntax-highlight changed/context lines of the
 * touched file. Unknown or missing extensions fall back to `plain`.
 */
export declare function langFromPath(path: string): Lang;
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