app.jsx

import React from 'react'
import { BrowserRouter as Router, Route, Link } from 'react-router-dom'
import ReactDOM from 'react-dom'

class Example extends React.Component {

  render() {
    return (
      <Router>
        <div>
          <Route
            exact
            path="/"
            render={() => (
              <Link to={`/%E2%98%83/frosty`}>Frosty</Link>
            )}
          />
          <Route
            path={'/\u2603/:name'}
            render={({ match }) => {
              return (
                <div>{match.params.name}, the snowman</div>
              )
            }}
          />
        </div>
      </Router>
    )
  }
}

ReactDOM.render(
  <Example />,
  document.getElementById('container'),
)