Techanjs zoom freez in updating chart

Question

I am using Techanjs to create updating candlestick chart, the example I am referring is => http://bl.ocks.org/andredumas/95f1f22130fb1a3a8181 This example doesn't support zoom so from another example => http://bl.ocks.org/andredumas/a48008ea8e2c832144db I copied the code for zoom.

My chart is zooming now but now the issue I am facing is the zoom got reset to the original zoom level when the new candle gets added in the chart. current code

function zoomed() {
var rescaledY = d3.event.transform.rescaleY(y);
yAxis.scale(rescaledY);
candlestick.yScale(rescaledY);

Code I tried:

function zoomed() {
let t = d3.zoomTransform( svg.node());
var rescaledY = t.rescaleY(y);
yAxis.scale(rescaledY);
candlestick.yScale(rescaledY);

below line is present where I am reading the json

zoomableInit = x.zoomable().clamp(false).copy();

To freeze the zoom I tried to modify the rescaleY and rescaleX functions but didn't really understand the required changes. Please suggest.