/**
 * Extracts specified properties from an object.
 *
 * @param source - The source object to extract properties from.
 * @param properties - Array of property keys to extract.
 * @returns An object containing the specified properties of the source.
 */
export declare function pickProperties<TObject, TPropertyKeys extends keyof TObject>(source: TObject, properties: TPropertyKeys[], mapper?: (value: unknown) => {
    value: any;
} | false): Pick<TObject, TPropertyKeys>;