import { ConstructorType, CustomIntlConstructors } from './types';
/**
 * Cache for Intl and custom format instances to avoid repeated instantiation
 * Uses a two-level structure: constructor name -> cache key -> instance.
 */
declare class IntlCache {
    private cache;
    constructor();
    /**
     * Generates a consistent cache key from locales and options.
     * Handles all LocalesArgument types (string, Locale, array, undefined).
     */
    private _generateKey;
    /**
     * Gets a cached Intl instance or creates a new one if not found
     * @param constructor The name of the Intl constructor to use.
     * @param args Constructor arguments (locales, options).
     * @returns Cached or newly created Intl instance.
     */
    get<K extends keyof CustomIntlConstructors>(constructor: K, ...args: ConstructorParameters<CustomIntlConstructors[K]>): InstanceType<ConstructorType<K>>;
}
/**
 * Global instance of the Intl cache for use throughout the application
 */
export declare const intlCache: IntlCache;
export {};