import WebSocket from 'isomorphic-ws';
/** Should be one WS key per unique URL */
export declare const WS_KEY_MAP: {
    readonly spotPublicV1: "spotPublicV1";
    readonly spotPrivateV1: "spotPrivateV1";
    readonly futuresPublicV1: "futuresPublicV1";
    readonly futuresPrivateV1: "futuresPrivateV1";
    readonly futuresPublicV2: "futuresPublicV2";
    readonly futuresPrivateV2: "futuresPrivateV2";
};
/** This is used to differentiate between each of the available websocket streams */
export type WsKey = (typeof WS_KEY_MAP)[keyof typeof WS_KEY_MAP];
/**
 * Some exchanges have two livenet environments, some have test environments, some dont. This allows easy flexibility for different exchanges.
 * Examples:
 *  - One livenet and one testnet: NetworkMap<'livenet' | 'testnet'>
 *  - One livenet, sometimes two, one testnet: NetworkMap<'livenet' | 'testnet', 'livenet2'>
 *  - Only one livenet, no other networks: NetworkMap<'livenet'>
 */
type NetworkMap<TRequiredKeys extends string, TOptionalKeys extends string | undefined = undefined> = Record<TRequiredKeys, string> & (TOptionalKeys extends string ? Record<TOptionalKeys, string | undefined> : Record<TRequiredKeys, string>);
export declare const WS_BASE_URL_MAP: Record<WsKey, NetworkMap<'livenet'>>;
export declare const WS_ERROR_ENUM: {
    INVALID_ACCESS_KEY: string;
};
export declare function neverGuard(x: never, msg: string): Error;
/**
 * ws.terminate() is undefined in browsers.
 * This only works in node.js, not in browsers.
 * Does nothing if `ws` is undefined. Does nothing in browsers.
 */
export declare function safeTerminateWs(ws?: WebSocket | any, fallbackToClose?: boolean): boolean;
export {};