/**
 * LRU token cache for parsed markdown tokens.
 *
 * Extracted from Claude Code's Markdown.tsx. marked.lexer is the hot cost on
 * virtual-scroll remounts (~3ms per message). useMemo doesn't survive
 * unmount->remount, so scrolling back to a previously-visible message
 * re-parses. Messages are immutable in history; same content -> same tokens.
 * Keyed by hash to avoid retaining full content strings.
 */
export declare class LRUTokenCache<T> {
    private readonly maxSize;
    private readonly cache;
    constructor(maxSize?: number);
    /**
     * Get a cached value by content string, promoting it to MRU position.
     * Returns undefined on miss.
     */
    get(content: string): T | undefined;
    /**
     * Store a value keyed by content string. Evicts LRU entry if at capacity.
     */
    set(content: string, value: T): void;
    /** Number of cached entries. */
    get size(): number;
    /** Remove all cached entries. */
    clear(): void;
}
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