import { type MergeTypes } from './helpers.ts';
export type MergeOptions = {
    mergeArrays?: boolean;
    mergeSets?: boolean;
};
export declare const prepareMergeHandlers: () => void;
/**
 * overridable defaults for the merge function
 */
export declare const mergeDefaults: MergeOptions;
/**
 * Deep merge Objects, Arrays, Maps and Sets
 * @param target
 * @param source
 */
export declare const merge: <Target = any, Source = any>(target: Target, source: Source, options?: MergeOptions) => MergeTypes<Target, Source>;