export interface Concat<Type = any> extends Function {
    (a: string, b: string): string;
    (a: Type[], b: Type[]): Type[];
    (a: string, b: Type[]): Type[];
    (a: Type[], b: string): Type[];
    (a: Type[] | string, b: Type[] | string): Type[] | string;
}
declare const _default: Concat<any>;
export default _default;