JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" id="checkbox">

JavaScript

$(document).keydown(function(e) {
    var code = (e.keyCode ? e.keyCode : e.which);
    if (code === 88) {//x
        triggerShiftClick();
    }
});

var triggerShiftClick = function() {
    var e = jQuery.Event("click");
    e.shiftKey = true;
    $("#checkbox").trigger(e);    
};

$("#checkbox").click(function(e) {
    debugger;
    if (e.shiftKey) {
        alert('I was shift-clicked!');
    }
});