import { CatalogClient } from '../types';
import { PetProvider, PetProviderRegistry } from './types';
export declare class DefaultProviderRegistry implements PetProviderRegistry {
    private providers;
    register(provider: PetProvider): void;
    unregister(id: string): boolean;
    get(id: string): PetProvider | undefined;
    has(id: string): boolean;
    list(): PetProvider[];
}
/** Module-singleton registry used by the IIFE + ES widget builds. */
export declare const defaultProviderRegistry: DefaultProviderRegistry;
/**
 * Build a CatalogClient that aggregates pets from every provider in the
 * registry that implements fetchPets(). Pets from earlier-registered
 * providers win on id collision.
 */
export declare function providerCatalogClient(registry: PetProviderRegistry): CatalogClient;