React Native: Sending Events from Native to JavaScript

Think of it as a webhook from your native code to your JavaScript UI. This allows native modules to push updates to JS without being explicitly called, enabling reactive UIs for asynchronous events like a file download completing or a system setting changing. The process involves defining an `EventEmitter` in your TurboModule spec, running Codegen, and then subscribing to the event in your React component using `useEffect`. The main footgun is forgetting to clean up the event listener, which can lead to memory leaks and unexpected behavior.