TS2454

error TS2454: Variable ‘myFavoriteNumber’ is used before being assigned.

Broken Code ❌

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

Fixed Code ✔️

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

or

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