error on simply import runtime in create-react-app v1

[naivefun]

import MDX from "@mdx-js/runtime";

then I get, 0.15.4 and tried 0.15.0

./node_modules/@mdx-js/mdx/mdx-hast-to-jsx.js
Module parse failed: Unexpected token (21:6)
You may need an appropriate loader to handle this file type.
|     const paramCaseRe = /^(aria[A-Z])|(data[A-Z])/
|     node.properties = Object.entries(node.properties).reduce((properties, [key, value]) => ({
|       ...properties,
|       [paramCaseRe.test(key) ? paramCase(key) : key]: value,
|     }), {})

[silvenon]

This error is probably specific to your setup, in CodeSandbox it works fine. Could you provide a repository reproducing this issue?

[naivefun]

mdx-runtime.zip

the attached is a create-react-app without any modification except for adding runtime dependency. If you run yarn and yarn start it should throw the error.

[silvenon]

This works in create-react-app v2, but I submitted a PR to fix this for v1.