import type { L1OrderBook, L2OrderBook } from '#types/orderBook';
/**
 * Determine whether two level 1 order books are equal
 */
export declare function L1Equal(beforeL1: L1OrderBook, afterL1: L1OrderBook): boolean;
/**
 * Updates a level 2 orderbook using a partial "diff" received over websockets
 *
 * @param updatedLevels
 * - level 2 orderbook containing only limit order price levels that have changed
 *
 * @returns orderbook is updated in-place
 */
export declare function updateL2Levels(book: L2OrderBook, updatedLevels: L2OrderBook): void;
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