/**
 * Helper functions for schema-forge
 */
/**
 * Clones metadata using JSON serialization/deserialization
 */
export declare function cloneMetadata(metadata: any): any;
/**
 * Prepares a JSON Schema object for OpenAI structured output compatibility.
 *
 * This function:
 * - Adds additionalProperties:false to enforce strict schema validation
 * - Makes all properties required (adds them to the required array)
 * - Removes JSON Schema features not supported by OpenAI
 * - Optionally converts optional properties to use ["type", "null"] format
 *
 * @public
 * @param schema The JSON Schema object to enhance
 * @param handleOptionals Whether to convert optional properties to ["type", "null"] format
 * @returns Enhanced JSON Schema object ready for OpenAI structured output
 *
 * @example
 * // Enhance a JSON Schema for OpenAI structured output
 * const schema = {
 *   type: 'object',
 *   properties: {
 *     name: { type: 'string' },
 *     age: { type: 'number' }
 *   },
 *   required: ['name']
 * };
 * const enhancedSchema = prepareForOpenAIStructuredOutput(schema, true);
 * // age will be transformed to { type: ["number", "null"] }
 */
export declare function prepareForOpenAIStructuredOutput(obj: any, handleOptionals?: boolean): any;
/**
 * Type inference helper
 */
export declare function inferType<T>(_target: new (...args: any[]) => any): T;
/**
 * Checks if a type is a custom class
 */
export declare function isCustomClass(type: any): boolean;
/**
 * Extracts values from an enum type
 */
export declare function extractEnumValues(enumType: any): any[];
/**
 * Gets the corresponding JSON Schema type for a TypeScript type
 */
export declare function getJsonSchemaType(type: any): string;