/**
 * Lightweight graphql-ws protocol (graphql-transport-ws) client.
 * Implements the minimal subset needed for subscriptions.
 *
 * Protocol spec: https://github.com/enisdenjo/graphql-ws/blob/master/PROTOCOL.md
 */
type MessageHandler = {
    onData: (data: unknown) => void;
    onError: (error: unknown) => void;
    onComplete: () => void;
    onConnected: () => void;
};
export declare const createGraphqlWsClient: (wsUrl: string, query: string, variables: Record<string, unknown> | undefined, handlers: MessageHandler) => {
    close: () => void;
};
export {};