export declare function transferFields<T>(source: T, predicate: (f: keyof T, v: T[keyof T]) => boolean, destination: Partial<T>, ...fields: (keyof T)[]): number;
export declare namespace transferFields {
    function truthy<T>(source: T, destination: Partial<T>, ...fields: (keyof T)[]): number;
    function notNull<T>(source: T, destination: Partial<T>, ...fields: (keyof T)[]): number;
    function defined<T>(source: T, destination: Partial<T>, ...fields: (keyof T)[]): number;
    function changed<T>(source: T, compare: T, destination: Partial<T>, ...fields: (keyof T)[]): number;
}
export declare function hasChangedFields<T>(left: T, right: T, ...fields: (keyof T)[]): boolean;
type ExtractChangedFieldsResult<T> = {
    transferred: number;
    result: Partial<T>;
};
export declare function extractChangedFields<T>(source: Partial<T>, image: T, ...fields: (keyof T)[]): ExtractChangedFieldsResult<T>;
export {};