import { ApiSseOptions } from '../decorators/api-sse.options';
/**
 * Utility functions for SSE decorator validation and processing
 */
/**
 * Constructor type for class constructors
 */
export type Constructor<T = Record<string, never>> = new (...args: any[]) => T;
/**
 * Validate ApiSse decorator options
 *
 * @param options SSE configuration options
 * @throws Error if options are invalid
 */
export declare function validateSseOptions(options: ApiSseOptions): void;
/**
 * Convert event name to a valid schema name
 *
 * @param eventName Event name (e.g., 'user-created')
 * @returns Schema name (e.g., 'UserCreated')
 */
export declare function eventNameToSchemaName(eventName: string): string;
/**
 * Check if a class has Swagger decorators
 *
 * @param dtoClass DTO class constructor
 * @returns True if the class has Swagger metadata
 */
export declare function hasSwaggerDecorators(dtoClass: object): boolean;
/**
 * Get default content type for SSE
 *
 * @returns Default SSE content type
 */
export declare function getDefaultSseContentType(): string;
/**
 * Create example SSE event data
 *
 * @param eventName Event name
 * @param data Event data
 * @returns Formatted SSE event string
 */
export declare function createSseEventExample(eventName: string, data: any): string;
/**
 * Get SSE metadata from a method
 *
 * @param target Target class
 * @param propertyKey Method name
 * @returns SSE metadata or undefined
 */
export declare function getSseMetadata(target: object, propertyKey: string | symbol): ApiSseOptions | undefined;