export type Diff<T> = {
    before: T;
    after: T;
};
export declare function matchArrayItemsByKey<T>({ before, after, key, }: Diff<T[]> & {
    key: keyof T | ((item: T) => unknown);
}): {
    pairs: Diff<T>[];
    added: T[];
    removed: T[];
};
export declare function comparePairs<T>(pairs: Diff<T>[], equalsFn: (pair: Diff<T>) => boolean): {
    changed: Diff<T>[];
    unchanged: T[];
};