/**
 * Cache utility for storing conversion results to improve performance
 * for repeated conversions of the same numbers.
 */
import { ConversionResult } from '../types/converterTypes';
type CacheKey = {
    value: string;
    lang: string;
    isCurrency: boolean;
    includeDecimal: boolean;
    individualDecimalDigits?: boolean;
    currency?: string;
    decimalSuffix?: string;
    currencyDecimalSuffix?: string;
};
/**
 * LRU Cache for conversion results
 */
export declare class ConversionCache {
    private cache;
    private readonly maxSize;
    constructor(maxSize?: number);
    /**
     * Get cached result, implementing LRU behavior.
     */
    get(key: CacheKey): ConversionResult | undefined;
    /**
     * Set cached result, evicting oldest if necessary.
     */
    set(key: CacheKey, result: ConversionResult): void;
    /**
     * Clear all cached entries.
     */
    clear(): void;
    /**
     * Get current cache size.
     */
    get size(): number;
}
/**
 * Global singleton cache instance
 */
export declare const conversionCache: ConversionCache;
export {};