Discord send message button on desktop trigger event?

var chatbox = document.getElementsByClassName("slateTextArea-1Mkdgw");

chatbox["0"].textContent = "good morning!"; //changes the text field input box

 

var enter_ev = new CustomEvent("keypress"); //or is it on key down

enter_ev.which = 13;

enter_ev.keyCode = 13;

chatbox["0"].dispatchEvent(enter_ev);

document.dispatchEvent(enter_ev);

 

(I DO NOT WANT TO CREATE A BOT USING NODEJS), I want to run a local script via chrome dev tools to submit a message but I don't know what html element to trigger the event on.