import { JSONSchema4 } from 'json-schema';
/**
 * Custom property name for storing enum value descriptions.
 * Follows JSON Schema conventions for extension properties (x- prefix).
 */
export declare const ENUM_VALUE_DESCRIPTIONS_KEY = "x-json2jsii-enumValueDescriptions";
/**
 * Type for the enum value descriptions mapping.
 */
export type EnumValueDescriptions = Record<string, string>;
/**
 * Reduces multiple occurrences of the same type in oneOf/anyOf into a single type.
 * Only reduces primitive types and $refs with matching references.
 * For enums, combines all enum values into a single enum and preserves descriptions.
 */
export declare function reduceDuplicateTypesInUnion(def: JSONSchema4): JSONSchema4;