Type 'File | null' is not assignable to type 'File'. Type 'null' is not assignable to type 'File'.ts(2322) code example
Example: Argument of type 'string | null' is not assignable to parameter of type 'string'. Type 'null' is not assignable to type 'string'
this.currentUser = JSON.parse(localStorage.getItem('currentUser') || '{}');