/** Maximum source size eligible for optional asynchronous Shiki enhancement. */
export declare const MAX_HL_CHARS = 32000;
type CodeToAnsi = (code: string, lang: string, theme: string) => Promise<string>;
export type ShikiLoader = () => Promise<CodeToAnsi>;
/**
 * Small, viewer-local async cache. The synchronous Pi highlighter remains the
 * first paint; Shiki is only requested by an expanded card that has metadata.
 */
export declare class ShikiHighlightCache {
    private readonly loader;
    private readonly cache;
    private readonly pending;
    constructor(loader?: ShikiLoader);
    get(code: string, lang: string | undefined, theme: string, fallback: readonly string[], invalidate?: () => void): string[] | undefined;
    clear(): void;
}
export declare const shikiHighlightCache: ShikiHighlightCache;
export {};
//# sourceMappingURL=shiki-highlight.d.ts.map