import { Type } from "../Type";
import { TypeBuilderBase } from "./TypeBuilderBase";
export declare class UnionTypeBuilder extends TypeBuilderBase {
    private types;
    /**
     * Add types to union
     * @param types
     */
    addTypes(...types: Type[]): this;
    /**
     * Build Union Type.
     * Does not return Union if there is only one type.
     * Returns Type.Undefined if there is no type.
     */
    build(): Type;
}