gamepad library Null safety

Gamepad

https://w3c.github.io/gamepad/

Classes

Gamepad
The interface of the Gamepad API defines an individual gamepad or other controller, allowing access to information such as button presses, axis positions, and id. [...]
GamepadButton
The interface defines an individual button of a gamepad or other controller, allowing access to the current state of different types of buttons available on the control device. [...]
GamepadEvent
The GamepadEvent interface of the Gamepad API contains references to gamepads connected to the system, which is what the gamepad events Window.gamepadconnected and Window.gamepaddisconnected are fired in response to.
GamepadEventInit

Enums

GamepadMappingType