How to cress?

boop.js

import React from 'react'
import { Cress } from './path/to/Cress.js';

// looks like dead-code right?
new Cress('.my-selector', {
  css() {
    return `
      this {
        font-family: cursive;
      }
    `
  }
});

export default function() {
  return <p className="my-selector">this.this you say</p>
}