import { Comparator } from '../types/index.js';
export declare namespace Fields {
    type Getter<T> = (obj: Partial<T>) => (T[keyof T] | undefined);
    type Setter<T> = (obj: Partial<T>, val: T[keyof T] | undefined) => void;
    type Comparer<T> = (source: Partial<T>, target: Partial<T>) => boolean;
    type Updater<T> = (target: T, source: T) => T;
}
export declare function updateField<T>(target: T, source: Partial<T>, diff: Partial<T>, key: keyof T, hasChanged?: null | Fields.Comparer<T>): boolean;
export declare function updateFieldExtended<T>(target: T, source: Partial<T>, diff: Partial<T>, get: Fields.Getter<T>, set: Fields.Setter<T>, hasChanged?: null | Fields.Comparer<T>): boolean;
export type UpdateArrayOptions<T> = {
    additive?: boolean;
    unshift?: boolean;
    clone?: boolean;
    comparator?: Comparator<T>;
    updater?: Fields.Updater<T>;
    sorter?: Comparator<T, number> | null | undefined;
    hooks?: UpdateArrayHooks<T>;
};
export type UpdateArrayHooks<T> = {
    onAdded?: (item: T, index?: number) => void;
    onDeleted?: (item: T, index?: number) => void;
    onUpdated?: (previous: T | null | undefined, next: T, index?: number) => void;
};
export declare function updateArray<T>(target: T[] | null, source: T[] | null, options?: UpdateArrayOptions<T>): {
    changed: number;
    result: T[] | null;
};