/**
 * UDF-inspired datafeed contract for trading charts (Stage 2.24).
 */
export interface SymbolInfo {
    symbol: string;
    name: string;
    description?: string;
    timezone?: string;
    session?: string;
    pricescale?: number;
    minmov?: number;
}
export interface Bar {
    time: number;
    open: number;
    high: number;
    low: number;
    close: number;
    volume?: number;
}
export interface HistoryRequest {
    symbol: string;
    resolution: string;
    from: number;
    to: number;
}
export interface SubscribeBarsRequest {
    symbol: string;
    resolution: string;
    onBar: (bar: Bar) => void;
}
/**
 * TradingView UDF-style adapter surface.
 */
export interface DatafeedAdapter {
    resolveSymbol(symbol: string): Promise<SymbolInfo>;
    getBars(request: HistoryRequest): Promise<Bar[]>;
    subscribeBars(request: SubscribeBarsRequest): () => void;
}
/** Convert bars to typed OHLC arrays for velo-plot series. */
export declare function barsToOhlc(bars: Bar[]): {
    x: Float64Array;
    open: Float32Array;
    high: Float32Array;
    low: Float32Array;
    close: Float32Array;
    volume: Float32Array;
};