React Compiler on non-JSX

[barryam3]

To what extent does the React compiler support non-JSX source?

This gets memoized (playground):

export default function MyApp() {
  return <div>Hello World</div>;
}

This does not (same for the _jsx runtime) (playground):

import React from "react";
export var App = function () {
  return React.createElement("div", null, "Hello World");
};

However, if I add a hook call, even if unused, then it does (playground):

import React from "react";
export var App = function () {
  React.useState()
  return React.createElement("div", null, "Hello World");
};

I'm not actually trying to develop without JSX, but I ran the compiler on some post-transpilation code and was surprised to see some of my components memoized. I'm trying to understand what actually triggers memoization in the compiler.