Function _switchState

packages/melonjs/src/state/state.ts:175–210

* start the SO main loop * @ignore

(stateId: number)

 * @ignore
 */
function _switchState(stateId: number): void {
	// clear previous interval if any
	_stopRunLoop();

	// call the stage destroy method
	// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
	if (_stages[_state]) {
		_stages[_state].stage.destroy(_app);
	}

	// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
	if (_stages[stateId]) {
		// set the global variable
		_state = stateId;

		// call the reset function with the app reference and any extra args
		if (_extraArgs) {
			_stages[_state].stage.reset(_app, ..._extraArgs);
		} else {
			_stages[_state].stage.reset(_app);
		}

		// and start the main loop of the
		// new requested state
		_startRunLoop();

		// publish the pause event
		emit(STATE_CHANGE);

		// execute callback if defined
		if (_onSwitchComplete) {
			_onSwitchComplete();
			_onSwitchComplete = null;
		}
	}
}

// the active application instance
let _app: Application;