import type { Bar } from '../../api/types';
export declare class DataSource {
    /** Bars sorted by time ascending */
    private bars;
    /** Map timestamp → index for O(1) lookup */
    private timeIndex;
    get length(): number;
    get first(): Bar | undefined;
    get last(): Bar | undefined;
    /** Replace all data */
    setData(bars: Bar[]): void;
    /** Add bars to the beginning (scroll-back / history load) */
    prepend(bars: Bar[]): void;
    /** Add or update the last bar (real-time tick) */
    updateLast(bar: Bar): void;
    /** Get bar at index */
    getBar(index: number): Bar | undefined;
    /** Get bar by timestamp */
    getBarByTime(time: number): Bar | undefined;
    /** Get index of bar by timestamp (or -1) */
    indexOfTime(time: number): number;
    /**
     * Find the bar index nearest to a given timestamp.
     * Uses binary search for O(log n).
     */
    nearestIndex(time: number): number;
    /** Get slice of bars by index range [from, to) */
    getRange(from: number, to: number): Bar[];
    /** Get all bars whose time is within [timeFrom, timeTo] */
    getRangeByTime(timeFrom: number, timeTo: number): Bar[];
    /** Get min/max price in an index range [from, to) */
    getPriceRange(from: number, to: number): {
        min: number;
        max: number;
    } | null;
    /** Get max volume in an index range [from, to) */
    getMaxVolume(from: number, to: number): number;
    /** Get all bars (readonly view) */
    getAllBars(): readonly Bar[];
    private rebuildIndex;
}