import { Instrument } from '@quantform/core';
export declare function watchOrderbook(instrument: Instrument): import("rxjs").Observable<{
    timestamp: number;
    instrument: Instrument;
    bids: {
        price: import("@quantform/core").decimal;
        size: import("@quantform/core").decimal;
        count: number;
    }[];
    asks: {
        price: import("@quantform/core").decimal;
        size: import("@quantform/core").decimal;
        count: number;
    }[];
}>;
export declare function hash(instrument: Instrument): (string | Instrument)[];
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