/**
 * RpcError is the base class for every error surfaced from a specular call:
 * built-in protocol errors, user-defined errors, and the generic
 * {@link UnknownRpcError} produced when the client cannot resolve the error
 * type.
 */
export declare class RpcError extends Error {
    constructor(message?: string);
}
/**
 * UnknownRpcError is thrown when the server returns an error whose type the
 * client was not generated with knowledge of (for example a newer server
 * introduced an error type after the client was generated).
 *
 * It is still a catchable {@link RpcError} while exposing the raw payload so
 * forward-compatible code can read the fields it knows.
 */
export declare class UnknownRpcError extends RpcError {
    /** Fully-qualified type name (e.g. application/spec.ns.mod.type) advertised by the server. */
    readonly typeName: string;
    /** Machine-readable code, when discoverable in the payload. */
    readonly code?: string;
    /** Raw, undecoded error payload. */
    readonly payload: unknown;
    constructor(typeName: string, payload: unknown);
}