andreypopp / andreypopp/react-css-components

Fix react unkown props

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help wanted
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Description

when using the following syntax with React `15.x`
```css
Label {}
Label:prop(mode == 'edit') {}
```
```jsx

```
React throws the following error:
```
Warning: Unknown prop `mode` on

tag. Remove this prop from the element. For details, see https://fb.me/react-unknown-prop
```
If I understand correctly what is being said [here](https://gist.github.com/jimfb/d99e0678e9da715ccf6454961ef04d1b), you should be able to remove unknown props. Basically, that means that the syntax you are currently using should be deprecated.
I would suggest keeping to the `variant` prop:
```jsx

```
Tell me what you think.

**EDIT:** On second thoughts, the syntax is still very useful in many cases. For instance, you could choose to change the style of the component when `onClick` prop is set. I think it should be clearer in the doc that the library does not whitelist the props, and that you should use this feature only with props the component accepts.

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