some.ts

interface CandleData {
    subscribeData(
        symbol: string,
        aggregation: AggregationPeriod,
        /**
         * `fromTime` and `toTime` options are candles timestamps which should be used when requesting more candles data (lazy loading)
         * `fromTime` is an oldest candle's timestamp which should be data get from, `toTime` is the newest (usually toTime candle equals the oldest visible candle)
         */
        options?: ChartDataOptions,
         
        onSnapshot: (data: ChartCandleData[]) => void),
        onUpdate: (data: ChartCandleData[]) => void),
        onError: (error: Error) => void
    ): {
        requestRange(fromTime: number, toTime: number): void
        unsubscribe(): void
    };

    createDataModel(
        symbol: string,
        aggregation: AggregationPeriod,
        /**
         * `fromTime` and `toTime` options are candles timestamps which should be used when requesting more candles data (lazy loading)
         * `fromTime` is an oldest candle's timestamp which should be data get from, `toTime` is the newest (usually toTime candle equals the oldest visible candle)
         */
        options?: ChartDataOptions,
        /**
         * !!! Use with caution !!!
         * This function updates the whole instrument series data
         */
        // sub?: (data: ChartCandleData[]) => void
    ): {
        subscribe(onUpdate: (sub: (type: 'snapshot' | 'update', data: ChartCandleData[]) => void)): Cancel
          
        get(fromTime: number, toTime: number, onResult: ResultCallback, onError: ErrorCallback): Cancel;
          
        close(): void
    };
}