var clientSystem = client.registerSystem(0, 0);
let debug = true;	

clientSystem.initialize = function () {
	this.listenForEvent("minecraft:client_entered_world", onEntering);
};

function onEntering (eventData) {
	if (debug == true)
		sendMessage("§4Hello There"); 
};

sendMessage = function (text) {
	clientSystem.broadcastEvent("minecraft:display_chat_event", text);
};
/*
// per-tick updates
clientSystem.update = function() {
    // Any logic that needs to happen every tick on the client.
}

*/