Description

I stumble across an issue where the Fast Refresh feature doesn't work with a Vite plugin I'm maintaining. After examination, I identified the root cause: The generated code with .js extension uses react/jsx-runtime for JSX transformation instead of react/jsx-dev-runtime, because of this, the generated code is no longer eligible for applying Fest Refresh, which results in a full page reloaded.

// Generated by ReScript, PLEASE EDIT WITH CARE

import * as JsxRuntime from "react/jsx-runtime";

function Res(props) {
  return JsxRuntime.jsx("h3", {
    children: "ReScript Component",
    className: "text-blue-100",
  });
}

var make = Res;

export { make };
/* react/jsx-runtime Not a pure module */

In order to fix it, this PR adds an extra check for such case so that the Fast Refresh works as expected.

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.