Tell TS It’s a String

Sometimes you have a value typed as unknown, but you know it is a string at this point. An assertion lets you say “treat this as a string.” It only affects types; it does not convert the value at runtime.

Prefer real checks when possible. Here we will assert because the input is guaranteed by the caller in this small example.

function double(x: unknown) {
  return (x as number) * 2;
}

Your Task

Make a function that returns the uppercased string.

• Implement shout(x: unknown): string.
• Use a type assertion to treat x as a string and return it in upper case.
• Keep the body small and do not mutate anything.