JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="log" rows="25"></textarea>

CSS

#log {
    width: 100%;
}

JavaScript

"use strict";

function rewriteGoTo(func) {
    var code = '(';
    code += func.toString()
        .replace(/^\s*(\w+)\s*:/gm, 'case "$1":')
        .replace('{', '{ var $_label = ""; function goTo(label) { $_label = label; throw goTo; } while(true) try { { switch($_label) { case "": ');
    code += '} return; } catch($_e) { if($_e !== goTo) throw $_e; } })';
    return code;
}

jQuery(function($) {
    
    function print(text) {
        $('#log').append(Array.prototype.join.call(arguments, ' ') + '\n');
    }
    
    var test = eval(rewriteGoTo(function(before) {
        var i = 1;
        again: print(before + i);
        i = i + 1;
        if(i <= 10) goTo('again');
    }));
    
    print('### Generated code as decompiled by browser');
    print(test);
    print('');
    print('### Output');
    test('Hello world ', '\n');
    
});