Move createMuiTheme to @material-ui/core/createMuiTheme

[jgoux]

• This is not a v0.x issue.
• I have searched the issues of this repository and believe that this is not a duplicate.

Hello,

I think it would make more sense to have createMuiTheme in the @material-ui/styles package, along with the ThemeProvider component.

Also, why not rename it createTheme? The Mui part is kind of implied with the @material-ui organization.

[oliviertassinari]

@material-ui/styles has no links with the Material-UI core components, it's raw styling solution, like another, styled-components, emotion, aphrodite, radium, etc. I think that we will do it the other way around. People imports won't change once v4 is released.

[jgoux]

The other way around is great too, my point was to be able to import both createMuiTheme and ThemeProvider from the same package. 😸

What about the renaming createMuiTheme -> createTheme?

[oliviertassinari]

@jgoux We are going with the following change:

-import { createMuiTheme } from '@material-ui/core/styles';
+import createMuiTheme from '@material-ui/core/createMuiTheme'

The discussing started in #14852 (comment).

[oliviertassinari]

I'm giving up on this task. I'm not 💯% sure the change worth the breaking change. I'm closing.