Types · medium

29. Discriminated Unions

Switching on a common literal property.

Implement `area(shape)` for `Circle { kind: 'circle', radius }` and `Square { kind: 'square', size }`.

Required in your answer: kind: 'circle's.kind === 'circle'

Transpiled, then run in a sandbox

type Shape = any; // TODO
function area(s: Shape) {
  // TODO
}

Output appears here.