index.js

const typingTrigger = createCustomTrigger("benyamin:typing");

let current_message = "";

let getCurrentMessageRegister = register("step", () => {
        let message = Client.getCurrentChatMessage();
        if(message !== current_message){
            current_message = message;
            typingTrigger.trigger(current_message);
        }
    
}).unregister();

register("guiOpened", function() {
    // Delay to ensure Client.isInChat() works correctly
    setTimeout(function() {
        if(Client.isInChat()){
            getCurrentMessageRegister.register();
        }
    }, 50) 
});

register("guiClosed", function() {
    current_message = "";
    getCurrentMessageRegister.unregister();
});