import { GQLOperation, GQLConnectionACK, GQLConnectionKeepAlive, GQLErrorEvent, GQLData, GQLComplete, GQLStopOperation, GQLConnectionInit, AppSyncStartAck, AppSyncErrorEvent } from './protocol';
declare type AllowedProtocolEvents = GQLOperation | GQLConnectionACK | GQLConnectionKeepAlive | GQLErrorEvent | GQLData | GQLComplete | GQLConnectionInit | GQLStopOperation | AppSyncStartAck | AppSyncErrorEvent;
export declare function formatMessage(event: AllowedProtocolEvents): string;
export declare function formatErrorMessage(err: Error, isAppSync?: boolean): string;
export {};
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