function borderRadius(side, radius) {
    var uppercaseSide = capitalizeString(side);
    if (!radius && radius !== 0) {
      throw new PolishedError(62);
    }
    if (uppercaseSide === 'Top' || uppercaseSide === 'Bottom') {
      var _ref;
      return _ref = {}, _ref["border" + uppercaseSide + "RightRadius"] = radius, _ref["border" + uppercaseSide + "LeftRadius"] = radius, _ref;
    }
    if (uppercaseSide === 'Left' || uppercaseSide === 'Right') {
      var _ref2;
      return _ref2 = {}, _ref2["borderTop" + uppercaseSide + "Radius"] = radius, _ref2["borderBottom" + uppercaseSide + "Radius"] = radius, _ref2;
    }
    throw new PolishedError(63);
  }
Shorthand that accepts a value for side and a value for radius and applies the radius value to both corners of the side.
@example
// Styles as object usage
const styles = {
  ...borderRadius('top', '5px')
}

// styled-components usage
const div = styled.div`
  ${borderRadius('top', '5px')}
`

// CSS as JS Output

div {
  'borderTopRightRadius': '5px',
  'borderTopLeftRadius': '5px',
}