repng is a npm library which converts any React component to a png file.
The usage of this library is very simple as following.
Usage
$ repng <ReactComponent>
Options
-d --out-dir Directory to save file to
-f --filename Specify a custom output filename
-w --width Width of image
-h --height Height of image
-p --props Props in JSON format to pass to the React component
--css Path to CSS file to include
--webfont Path to custom webfont for rendering
Here are more details.