/**
 * ThreadTS Universal - Observability Decorators
 *
 * Decorators for logging, measuring, and validating method execution.
 * Supports both legacy (experimentalDecorators) and Stage-3 decorator syntax.
 *
 * @module decorators/observability
 */
/**
 * Decorator for logging method execution
 * Logs method calls, arguments, results, and execution time
 */
export declare function logged(options?: {
    logArgs?: boolean;
    logResult?: boolean;
    logTiming?: boolean;
}): (targetOrMethod: unknown, propertyKeyOrContext?: string | symbol | import('./utils').DecoratorContext, descriptor?: PropertyDescriptor) => import('./utils').DecoratorReturnType<import('./utils').AnyFunction>;
/**
 * Performance statistics type
 */
export interface PerformanceStats {
    count: number;
    min: number;
    max: number;
    avg: number;
    median: number;
    p95: number;
    p99: number;
}
/**
 * Decorator for measuring method performance.
 * Collects timing statistics across multiple calls.
 *
 * @example
 * ```typescript
 * class Calculator {
 *   @measure()
 *   async compute(data: number[]): Promise<number> {
 *     return data.reduce((a, b) => a + b, 0);
 *   }
 * }
 * // Access stats: Calculator.prototype.compute.getStats()
 * ```
 */
export declare function measure(): (targetOrMethod: unknown, propertyKeyOrContext?: string | symbol | import('./utils').DecoratorContext, descriptor?: PropertyDescriptor) => import('./utils').DecoratorReturnType<import('./utils').AnyFunction>;
/**
 * Validator function type
 */
export type ValidatorFn = (arg: unknown) => boolean | string;
/**
 * Decorator for validating method arguments.
 * Throws an error if validation fails.
 *
 * @param validators - Array of validator functions for each argument
 *
 * @example
 * ```typescript
 * class UserService {
 *   @validate([
 *     (id) => typeof id === 'string' && id.length > 0,
 *     (data) => data && typeof data.name === 'string'
 *   ])
 *   async updateUser(id: string, data: UserData): Promise<void> {
 *     await api.updateUser(id, data);
 *   }
 * }
 * ```
 */
export declare function validate(validators: ValidatorFn[]): (targetOrMethod: unknown, propertyKeyOrContext?: string | symbol | import('./utils').DecoratorContext, descriptor?: PropertyDescriptor) => import('./utils').DecoratorReturnType<import('./utils').AnyFunction>;
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