ds-realtime-chart--client.js

var client = deepstream('APP--URL')

// Login
client.login()


client.rpc.make( 'price-chart', { }, ( err, results ) => {
    var dataPoints = results;
    console.log(dataPoints)
    var chart = new CanvasJS.Chart("chartContainer", {
      title : {
        text : "BTC Realtime Price"
      },
      axisY: {
	title: "Price in BTC",
	titleFontColor: "rgb(0,75,141)",
        minimum: 750,
        maximum: 1700, 
			},
      data : [{
        type : "area",
        color: "rgba(0,75,141,0.7)",
        dataPoints : dataPoints
      }]
    });
    chart.render();
  
    var curPrice = client.record.getRecord('BTC/price');

     curPrice.subscribe('price', price => {
      dataPoints.length > 300 && dataPoints.shift()
      dataPoints.push({y: price})
      console.log(price)
      chart.render()
    })
});