Code Highlighting

Use // ^^^ to highlight a particular range of the line above it.

function 
function add(a: number, b: number): number
add(
a: number
a: number, 
b: number
b: number) {
  return 
a: number
a + 
b: number
b;
}

```ts twoslash
function add(a: number, b: number) {
  //     ^^^
  return a + b;
}
```