export declare type OrderBookResponse = {
    success: true;
    result: {
        /** Array with price and size */
        asks: [number, number][];
        /** Array with price and size */
        bids: [number, number][];
    };
};
export declare type OrderBookOptions = {
    /** Maximum is `100`
     * @default 20
     */
    depth?: number;
};
/** Retrieve order book of market name.
 * ```ts
 * import { fetchOrderBook } from "https://deno.land/x/ftx@$VERSION/mod.ts";
 * await fetchOrderBook("BTC/USD");
 * ```
 * @see https://docs.ftx.com/?javascript#get-orderbook
 */
export declare function fetchOrderBook(marketName: string, { depth }?: OrderBookOptions): Promise<OrderBookResponse>;