Please export createGenerateClassName and jssPreset

[dantman]

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

Sometimes it's necessary to customize the JssProvider as described here, when that happens it's necessary to import the createGenerateClassName and jssPreset from material-ui.

However currently index.js and index.es.js do not export these. In order to import these you have to directly import them from material-ui/styles instead of material-ui.

I think it's reasonable to expect that you can import {createGenerateClassName, jssPreset} from 'material-ui'; when it's valid to import {withStyles} from 'material-ui';.

The distaste with this is also the fact that material-ui/styles is an explicit module import. What is imported when you import material-ui is environment dependent because of the existence of both main and module. Importing material-ui/styles directly requires me to assume that I'm always in an environment where material-ui/styles is what material-ui imports for withTheme, etc... under the hood and it will never ever be material-ui/es/styles or material-ui/modules/styles.

Your Environment

Tech	Version
Material-UI	1.0.0-beta.38
Material-UI-Icons	1.0.0-beta.36
React	16.2.0
WebPack	3.11.0
Babel	6.26.0

[oliviertassinari]

@dantman I agree. Everything exported in the /styles/index.js file should be exported in the /index.js file.
https://github.com/mui-org/material-ui/blob/961edfa683355190e34f297855f7f0c0bdf5507a/src/styles/index.js#L1-L6
Do you want to work on it? :)

[dantman]

I'm finishing up today with things that just require explanations rather than coding and pull request creation. And tomorrow I'll probably have to upgrade material-ui and react for the new releases. But I'll consider making a PR once I'm done.