undefined class if both className and styleName are JSX expressions

[gewfy]

Hi!
I want the parent component to be able to set classes on it's child components. Therefore I need the className to be appended at runtime. But this:

<div className={this.props.className} styleName={"foo"}>

Renders:

<div class="undefined foo___1ZSNk">

Even if the parent component passes className to the child component.

Thank you!

[gajus]

Fixed. Thank you for reporting.