Method cleanCallback

src/node-binance-api.ts:5709–5709

        };
        let subscription;
        const cleanCallback = data => callback(this.fAggTradeConvertData(data));
        if (Array.isArray(symbols)) {
            if (!this.isArrayUnique(symbols)) throw Error('futuresAggTradeStream: "symbols" cannot contain duplicate elements.');
            const streams = symbols.map(symbol => symbol.toLowerCase() + '@aggTrade');