How to disable the extension of brush in d3.js?

@daisha 

To disable the extension of the brush in d3.js, you can set the extent attribute of the brush to null. Here's an example code snippet to demonstrate how to disable the extension of the brush:

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var brush = d3.brush()
    .extent(null)
    .on("end", brushed);

function brushed() {
    // Your brush event handling code here
}

// Add the brush to an SVG element
svg.append("g")
    .attr("class", "brush")
    .call(brush);

By setting the extent attribute to null, the brush will only be able to select within the existing boundaries and will not be able to extend beyond it.