Problems with context using react-jss about react-tree-walker HOT 1 OPEN

import { ThemeProvider } from 'styled-components'
import reactTreeWalker from 'react-tree-walker'
import App from './app'

function visitor(element, instance) {
  // ...
}

const app = (
  <ThemeProvider>
    <App />
  </ThemeProvider>
)

const context = {}

reactTreeWalker(app, visitor, context)
  .then(() => console.log('Works like a charm!'))
  .catch(err => console.error(err))