static jss as a raw css string

example.js

// source js
const styles = {
  static: {
    color: 'green'
  },
  mixed: {
    color: 'red',
    margin: (props) => props.spacing
  }
}

createStyleSheet(styles).attach()

// generated js
const styles = {
  '@raw': `
    .static-0-0-1 {
      color: green; 
    }
    .mixed-0-0-2 {
      color: red;
    }
  `,
  mixed: {
    margin: (props) => props.spacing
  }
}

const {classes} = createStyleSheet(styles, {
  classes: {
    static: 'static-0-0-1', 
    mixed: 'mixed-0-0-2'
  }
}).attach()