import type { DeepMerge, InitOptions, DepthMerge, ShallowMerge, ExtractNullBehavior, MergeAllToDepth } from './types/index.js';
import type { Nullish } from '@toolbox-ts/types';
import type { IntersectElementUnions, WithoutNullish } from '@toolbox-ts/types/defs/tuple';
export type MergeOptions<B = object, N = B> = Omit<InitOptions<B, N>, 'maxDepth'>;
export declare const mergeDeep: <B = object, N = B, O extends MergeOptions<B, N> = MergeOptions<B, N>>(current: B | Nullish, next: N | Nullish, opts?: O) => DeepMerge<B, N, ExtractNullBehavior<O>>;
export declare const mergeShallow: <B = object, N = B, O extends MergeOptions<B, N> = MergeOptions<B, N>>(current: B | Nullish, next: N | Nullish, opts?: O) => ShallowMerge<B, N, ExtractNullBehavior<O>>;
export declare const mergeToDepth: <B = object, N = B, D extends number = number, O extends MergeOptions<B, N> = MergeOptions<B, N>>(current: B | Nullish, next: N | Nullish, depth: D, opts?: O) => DepthMerge<B, N, ExtractNullBehavior<O>, D>;
/**
 * Merges two objects of the same shape to a specified depth (default Infinity).
 */
export declare function merge<D = object>(current: D | Nullish, next: D, { depth, ...opts }?: InitOptions<D> & {
    depth?: number;
}): D;
export declare function mergeAll<B, N extends readonly (Nullish | B)[]>(base: B | Nullish, next: [...N], { depth, ...rest }?: InitOptions & {
    depth?: number;
}): B;
export declare const mergeAllDeep: <B, N extends readonly unknown[] = readonly B[], O extends MergeOptions<B, IntersectElementUnions<WithoutNullish<N>>> = MergeOptions<B, IntersectElementUnions<WithoutNullish<N>>>>(base: B | Nullish, next: [...(N | Nullish[])], opts?: O) => DeepMerge<B, IntersectElementUnions<WithoutNullish<N>>, ExtractNullBehavior<O>>;
export declare const mergeAllShallow: <B, N extends readonly unknown[] = readonly B[], O extends MergeOptions<B, IntersectElementUnions<WithoutNullish<N>>> = MergeOptions<B, IntersectElementUnions<WithoutNullish<N>>>>(base: B | Nullish, next: [...(N | Nullish[])], opts?: O) => ShallowMerge<B, IntersectElementUnions<WithoutNullish<N>>, ExtractNullBehavior<O>>;
export declare const mergeAllToDepth: <B, N extends readonly unknown[] = readonly B[], D extends number = number, O extends MergeOptions<B, IntersectElementUnions<N>> = MergeOptions<B, IntersectElementUnions<N>>>(base: B | Nullish, next: [...(N | Nullish[])], depth: D, opts?: O) => MergeAllToDepth<B, N, ExtractNullBehavior<O>, D>;