import type { CatalogFetchState, CatalogSource, ResolvedCatalog } from '../types/index.js';
export declare function mergeCatalogs(base: ResolvedCatalog, custom: ResolvedCatalog): ResolvedCatalog;
export interface MergeLayer {
    source: CatalogSource;
    resolved: ResolvedCatalog | null;
    state: CatalogFetchState;
}
export declare function mergeCatalogStack(layers: MergeLayer[]): ResolvedCatalog;