import { CallCredentials, Channel, ChannelCredentials, ChannelOptions, Metadata } from '@grpc/grpc-js';
export declare const createMetadata: (token: string, appName?: string) => Metadata;
export declare const createMetadataCredentials: (metadata: Metadata) => CallCredentials;
export declare const createSSLCredentials: (metadataCreds: CallCredentials) => ChannelCredentials;
export declare const DEFAULT_GRPC_CHANNEL_OPTIONS: ChannelOptions;
export type SdkChannels = {
    unaryChannel: Channel;
    marketDataStreamChannel: Channel;
    operationsStreamChannel: Channel;
    ordersStreamChannel: Channel;
};
export type CreateChannelsOptions = {
    splitChannels?: boolean;
    grpcChannelOptions?: ChannelOptions;
};
export declare const resolveGrpcChannelOptions: (overrides?: ChannelOptions) => ChannelOptions;
export declare const makeChannel: (url: string, sslCreds: ChannelCredentials, grpcOptions?: ChannelOptions) => Channel;
export declare const createChannels: (url: string, sslCreds: ChannelCredentials, options?: CreateChannelsOptions) => SdkChannels;
export declare const closeChannels: (channels: SdkChannels) => Promise<void>;