JSFiddle - React, Tailwind, and code Playground

HTML

<svg id="chart" width="800" height="600"></svg>

JavaScript

function myFunction() {
    var isMouseUp = false;
    d3.select("#chart").on("mouseup", function() { func1(isMouseUp); });
}

myFunction();

function func1(isMouseUp) {
    console.log(isMouseUp);
    isMouseUp = true;
}