/**
 * Error handling utilities for the IoTeX SDK
 */
export declare class IoTeXError extends Error {
    code: string;
    details?: any | undefined;
    constructor(code: string, message: string, details?: any | undefined);
}
/**
 * Map gRPC status codes to user-friendly errors
 */
export declare function handleGrpcError(error: any): IoTeXError;
/**
 * Throw error if condition is not met
 */
export declare function assert(condition: boolean, message: string, code?: string): asserts condition;
/**
 * Validate that a value is not null or undefined
 */
export declare function assertExists<T>(value: T | null | undefined, message: string): asserts value is T;
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