/** Base error for all SDK errors. */
export declare class PolyNodeError extends Error {
    code?: string;
    constructor(message: string, code?: string);
}
/** HTTP API error with status code. */
export declare class ApiError extends PolyNodeError {
    status: number;
    constructor(message: string, status: number, code?: string);
}
/** WebSocket protocol error. */
export declare class WsError extends PolyNodeError {
    constructor(message: string, code?: string);
}
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