weird issue with depth about node-binance-api HOT 11 CLOSED

//minNotional = minimum order value (price * quantity)
binance.exchangeInfo(function(data) {
	let minimums = {};
	for ( let obj of data.symbols ) {
		let filters = {minNotional:0.001,minQty:1,maxQty:10000000,stepSize:1,minPrice:0.00000001,maxPrice:100000};
		for ( let filter of obj.filters ) {
			if ( filter.filterType == "MIN_NOTIONAL" ) {
				filters.minNotional = filter.minNotional;
			} else if ( filter.filterType == "PRICE_FILTER" ) {
				filters.minPrice = filter.minPrice;
				filters.maxPrice = filter.maxPrice;
			} else if ( filter.filterType == "LOT_SIZE" ) {
				filters.minQty = filter.minQty;
				filters.maxQty = filter.maxQty;
				filters.stepSize = filter.stepSize;
			}
		}
		minimums[obj.symbol] = filters;
	}
	console.log(minimums);
	fs.writeFile("minimums.json", JSON.stringify(minimums, null, 4), function(err){});
});

// For all symbols:
binance.websockets.prevDay(false, function(response) {
	console.log(response);
});

// For a specific symbol:
binance.websockets.prevDay('BNBBTC', function(response) {
	console.log(response);
});

binance.prices(function(ticker) {
	console.log("prices()", ticker);
	console.log("Price of BNB: ", ticker.BNBBTC);
});

		depth: function(symbol, callback, limit = 100) {
			publicRequest(base+"v1/depth", {symbol:symbol, limit:limit}, function(data) {
				if ( typeof data.bids !== "undefined" && typeof data.asks !== "undefined" ) {
					return callback.call(this, depthData(data), symbol);
				}
			});
		},

	const depthData = function(data) { // Used for /depth endpoint
		let bids = {}, asks = {}, obj;
		if ( typeof data.bids !== "undefined" ) {
			for ( obj of data.bids ) {
				bids[obj[0]] = parseFloat(obj[1]);
			}
		}
		if ( typeof data.asks !== "undefined" ) {
			for ( obj of data.asks ) {
				asks[obj[0]] = parseFloat(obj[1]);
			}
		}
		return {bids:bids, asks:asks};
	}