gistfile1.txt

//% root!TestDialogue.js
//  ^ says "run the original TestDialogue.js first"

(function() { // boilerplate, it hides some stuff so you don't pollute the script for other mods

var oldStep2 = step2;

step2 = function() {
  var orig = oldStep2();
  
  oldStep2.choice[3] = {
    "next": "newChoice",
    "text": "mod.dialogue.TestDialogue.anotherChoice"
  };
};


})(); // end boilerplate