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we still haven't released the StyledEngineProvider

Blocker resolved 👌

I've run all changed examples, everything seems to work fine except the create-react-app-with-styled-components example. It throws with this error:

Going to create PR for it.

Edited: Merged PR #24671 for fixing it.

I have pushed a commit d9d8454 with:

1. A reminder so developers that copy & paste the examples know that they can remove the injectFirst option at some point. It's also relevant for us in case we forget once JSS is gone.
2. Move away from makeStyles
3. Remove the StrictMode wrapper in one of the examples. I believe we are waiting on Warnings in strict mode #13394 to add this block cc @eps1lon.

on all examples except the nextjs, nextjs-with-typescript and ssr

@mnajdova I'm not sure to follow the rationale. Is it because it's too time-consuming to reproduce what docs/_app.js is doing? Or something else?

@mnajdova I'm not sure to follow the rationale. Is it because it's too time-consuming to reproduce what docs/_app.js is doing? Or something else?

These examples have custom emotion cache, so this approach is not applicable. They need to just add the prepend option to the custom cache. The custom cache is necessary as the same instance needs to be used between the client and the server.

These examples have custom emotion cache, so this approach is not applicable. They need to just add the prepend option to the custom cache. The custom cache is necessary as the same instance needs to be used between the client and the server.

Ohh I see, the problem is already fixed :). So this is dead code? it's for styled-components

https://github.com/mui-org/material-ui/blob/2c42921936f2c9e965f53e8e2a391210930b41d4/docs/pages/_app.js#L323

Ohh I see, the problem is already fixed :). So this is dead code?

Ah yes, we can drop it. Good catch, I forgot we have the same on the docs :)

Edited: You are right, it's still required for styled-components :)