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React & styled component

https://www.styled-components.com/#your-first-styled-component

tagged template literals

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals#Tagged_templates

https://www.styled-components.com/docs/advanced#tagged-template-literals

let person = 'Mike';
let age = 28;

const myTag = (strings, personExp, ageExp) => {
    let str0 = strings[0]; // "That "
    let str1 = strings[1]; // " is a "
    // There is technically a string after
    // the final expression (in our example),
    // but it is empty (""), so disregard.
    // var str2 = strings[2];
    let ageStr;
    if (ageExp > 99) {
        ageStr = 'centenarian';
    } else {
        ageStr = 'youngster';
    }

    // We can even return a string built using a template literal
    return `${str0}${personExp}${str1}${ageStr}`;
}

let output = myTag`That ${person} is a ${age}`;

console.log(output);
// That Mike is a youngster

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styled-components

CSS in JS

https://www.styled-components.com/

const Button = styled.a`
  /* This renders the buttons above... Edit me! */
  display: inline-block;
  border-radius: 3px;
  padding: 0.5rem 0;
  margin: 0.5rem 1rem;
   11rem;
  background: transparent;
  color: white;
  border: 2px solid white;

  /* The GitHub button is a primary button
   * edit this to target it specifically! */
  ${props => props.primary && css`
    background: #ccc;
    color: #0f0;
  `}
`

render(
  <div>
    <Button
      href="https://github.com/styled-components/styled-components"
      target="_blank"
      rel="noopener"
      primary
    >
      GitHub
    </Button>

    <Button as={Link} href="/docs" prefetch>
      Documentation
    </Button>
  </div>
)

refs

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