import { JSONSchema4 } from 'json-schema';
type Union = 'anyOf' | 'oneOf' | 'allOf';
/**
 * Safely selects a union type if exactly one union type is defined.
 *
 * @returns the selected union type or undefined if no union type is defined or if more than one union type is defined
 */
export declare function safeSelectUnion(def: JSONSchema4, allow?: Union[]): JSONSchema4[] | undefined;
/**
 * Returns the name of the union type if exactly one union type is defined.
 */
export declare function exactlyOneUnion(def: JSONSchema4, allow?: Union[]): Union | undefined;
/**
 * Removes any of the union types from the schema.
 */
export declare function removeUnions(def: JSONSchema4, allow?: Union[]): JSONSchema4;
export {};