from reactpy import component, run, web

mui = web.module_from_template(
    "react@^17.0.0",
    "@material-ui/core@4.12.4",
    fallback="⌛",
)
Button = web.export(mui, "Button")

@component
def HelloWorld():
    return Button({"color": "primary", "variant": "contained"}, "Hello World!")

run(HelloWorld)

Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of "text/plain". Strict MIME type checking is enforced for module scripts per HTML spec.