/**
 * ForgeError class for SDK errors
 */
import { ErrorCode } from './codes';
export declare class ForgeError extends Error {
    code: ErrorCode | string;
    details?: unknown | undefined;
    constructor(code: ErrorCode | string, message: string, details?: unknown | undefined);
    toString(): string;
    toJSON(): {
        name: string;
        code: string;
        message: string;
        details: unknown;
        stack: string | undefined;
    };
}
/**
 * User-friendly error messages
 */
export declare const USER_FRIENDLY_MESSAGES: Partial<Record<ErrorCode, string>>;
/**
 * Get user-friendly message for error code
 */
export declare function getUserFriendlyMessage(code: ErrorCode): string;
/**
 * Type guard to check if error is ForgeError
 */
export declare function isForgeError(error: unknown): error is ForgeError;
/**
 * Assert that value is defined (not null or undefined)
 */
export declare function assertDefined<T>(value: T | undefined | null, message: string): asserts value is T;
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