srmagura/skeleton-min-2

This demonstrates a ESM/CJS module resolution bug in Next.js.

Note: This project's package.json has "type": "module".

Repro Steps

1. Run yarn.
2. Copy the react-loading-skeleton directory from copy-this-into-node-modules into node_modules. This is a completely trimmed-down version of the library https://github.com/dvtng/react-loading-skeleton.
3. Run yarn dev.
4. Go to http://localhost:3000/.

Actual Behavior

The server prints:

----- CJS USED -----
Skeleton: { default: [Function: Skeleton] }

...

Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

If the line return <Skeleton />; is changed to return <div />;, the browser prints:

----- ESM USED -----
index.js?bee7:3 Skeleton: ƒ Skeleton() {
    return react__WEBPACK_IMPORTED_MODULE_0__.createElement('div');
}

Expected Behavior

The server should be using react-loading-skeleton/dist/index.mjs (the ES module), instead of react-loading-skeleton/dist/index.js (the CommonJS module).