import type { OrderbookLevel, BookSnapshot, BookUpdate, PriceChange } from './types/orderbook.js';
/**
 * Local orderbook state manager. Apply snapshots and deltas to maintain
 * a sorted local copy of the book for any number of assets.
 */
export declare class LocalOrderbook {
    private books;
    /** Replace the full book for an asset. */
    applySnapshot(snap: BookSnapshot): void;
    /** Apply an incremental delta. Size "0" removes the level. */
    applyUpdate(update: BookUpdate): void;
    /** Apply a price change (updates best price tracking). */
    applyPriceChange(_change: PriceChange): void;
    /** Get the full book for an asset, or undefined if no snapshot received yet. */
    getBook(assetId: string): {
        bids: OrderbookLevel[];
        asks: OrderbookLevel[];
    } | undefined;
    /** Best bid (highest price) for an asset. */
    getBestBid(assetId: string): OrderbookLevel | undefined;
    /** Best ask (lowest price) for an asset. */
    getBestAsk(assetId: string): OrderbookLevel | undefined;
    /** Spread between best ask and best bid. Returns undefined if either side is empty. */
    getSpread(assetId: string): number | undefined;
    /** Number of tracked assets. */
    get size(): number;
    /** Clear all books. */
    clear(): void;
}
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