[v5.0.0-alpha.12] ThemeContext not found when using styled-engine-sc

• [x ] The issue is present in the latest release.
• [x ] I have searched the issues of this repository and believe that this is not a duplicate.

Current Behavior 😯

Because I already use styled-components, I installed @material-ui/styled-engine-sc and added an alias in my webpack config. The build finishes with a warning which states export 'ThemeContext' (imported as 'StyledEngineThemeContext') was not found in '@material-ui/styled-engine' and my app returns a blank page with the error Uncaught TypeError: Cannot read property 'Provider' of undefined.

Expected Behavior 🤔

The build should finish without any warnings and the app should work as usual.

Steps to Reproduce 🕹

Steps:

1. Update to latest MUI alpha and install @material-ui/styled-engine-sc according to readme.
2. Add webpack alias for styled-engine
3. Run webpack build

Additional information

Is there a possible problem with my config or is there something missing in the styled-engine-sc package? Because as soon as I add

export { ThemeContext } from 'styled-components';

to the index.js file in styled-engine-sc/esm/index.js the build finishes without error and my app works as expected.

[oliviertassinari]

@material-ui/styled-engine-sc@5.0.0-alpha.12 released. Sorry, I have missed it the change.

It works now https://codesandbox.io/s/interesting-kalam-fij5k?file=/src/App.tsx

Thanks for the reproduction!

[mnajdova]

I was able to repro it on our create-react-app-with-styled-components. Seems like we didn’t release the new version for the @material-ui/styled-engine-sc package. FYI @oliviertassinari

Edited create-react-app example project works correct, as we have the new version for the @material-ui/styled-engine package