import { Filter } from '../types.ts';
import { RealTimeFeedBase } from './realtimefeed.ts';
export declare class DeltaRealTimeFeed extends RealTimeFeedBase {
    protected readonly wssURL = "wss://socket.delta.exchange";
    protected mapToSubscribeMessages(filters: Filter<string>[]): {
        type: string;
        payload: {
            channels: {
                name: string;
                symbols: string[] | undefined;
            }[];
        };
    }[];
    protected messageIsError(message: any): boolean;
    protected sendCustomPing: () => void;
    protected messageIsHeartbeat(msg: any): boolean;
}
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