TS2454

Variable 'myFavoriteNumber' is used before being assigned.

Broken Code ❌

export function myNumber(): number {
  let myFavoriteNumber: number;
  return myFavoriteNumber;
}

Fixed Code ✔️

export function myNumber(): number {
  let myFavoriteNumber: number;
  myFavoriteNumber = 72;
  return myFavoriteNumber;
}

or

export function myNumber(): number {
  let myFavoriteNumber: number = 72;
  return myFavoriteNumber;
}