Transform HTML entities to unicode

The Babel JSX compiler converts HTML entities into the unicode characters they represent. In ReScript, we have to use the actual unicode directly. For some characters, like   this isn't always convenient.

Would it be possible for the React PPX to do the same transformation that Babel does? See their entity map for reference: https://github.com/babel/babel/blob/b3e2bcda73dea7d68b4c82bfabb92acb11b1ed90/packages/babel-parser/src/plugins/jsx/xhtml.js

Babel example

Input

let f = () => <div>&nbsp;</div>;

output

let f = () => /*#__PURE__*/React.createElement("div", null, "\xA0");

ReScript example

Input

let f = () => <div> {React.string("&nbsp;")} </div>

Output

function f(param) {
  return React.createElement("div", undefined, " ");
}

Note that "  will render as-is, not as an actual nonbreaking space character.

Start with the React PPX JSX transformation and compare its behavior with Babel's linked JSX entity map. Use the Babel and ReScript examples in the issue as cases to check; done means supported HTML entities produce the corresponding Unicode characters as Babel does.