dillon1000/react

[compiler] Expect components to have hook calls or jsx directly in body

Summary: We can tighten our criteria for what is a component by requiring that a component or hook contain JSX or hook calls directly within its body, excluding nested functions . Currently, if we see them within the body anywhere -- including nested functions -- we treat it as a component if the other requirements are met. This change makes this stricter.

We also now expect components (but not necessarily hooks) to have return statements, and those returns must be potential React nodes (we can reject functions that return function or object literals, for example).

ghstack-source-id: 4507cc3955216c564bf257c0b81bfb551ae6ae55
Pull Request resolved: https://github.com/facebook/react/pull/29865