// Hovering any identifier reveals its inferred type.
const 
const greeting: "Hello, Twoslash"greeting = "Hello, Twoslash"

function 
function twice(n: number): numbertwice(
(parameter) n: numbern: number) {
  return 
(parameter) n: numbern * 2
}

const 
const doubled: numberdoubled = 
function twice(n: number): numbertwice(
const greeting: "Hello, Twoslash"greeting.
(property) String.length: number
Returns the length of a String object.length)