Registers an event handler for a specified event. You can bind a function to one of several built-in events. The handler may cancel some events by returning true.

"onKey"
Called whenever a key is pressed or released.
Parameters:

• key (number): The virtual key code (refer to Microsoft's virtual-key codes).
• action (number): The action code, where:
  0 = Released
  1 = Pressed
  Note: Returning true cancels further processing of the key event.

"onMouse"
Triggered when a mouse button is pressed or released.
Parameters:

• button (number): The mouse button identifier, where:
  1 = Left Click
  2 = Right Click
  3 = Middle Click
  4 = Mouse Scroll
• action (number): The action code, where:
  0 = released
  1 = Pressed
  Note: Returning true cancels further processing of the mouse event.

"onPacketReceive"
Triggered each time the client receives a network packet.
Parameters:

• packet (any): The packet object.
• id (number): The identifier for the packet.
  Note: Returning true cancels further processing of the packet.

"onTick"
Called on every game tick (approximately every 0.05 seconds) when the client is in a world/server.
Parameters: None.

"onRender"
Use this event to render ImGui, DirectX and FlarialGUI. Parameters: None.

"onSetupAndRender"
Use this event to render Minecraft things like Tesselator. Parameters: None.

"onChat"
Triggered every time a chat message is sent in chat. Parameters: None.

• message (string): The message.
• name (string): The name of the sender for the message.
• type (number): The type of the message.
• xuid (string): The xuid of the sender for the message.
  Note: Returning true cancels the chat message from sending.

onEvent(eventName, handler)