a.ts(4,1): error TS2454: Variable 'a' is used before being assigned.
b.ts(4,1): error TS2454: Variable 'a' is used before being assigned.


==== a.ts (1 errors) ====
    export default interface A { value: number; }
    
    var a: A;
    a.value.toExponential();
    ~
!!! error TS2454: Variable 'a' is used before being assigned.
    
==== b.ts (1 errors) ====
    import A from './a';
    
    var a: A;
    a.value.toExponential();
    ~
!!! error TS2454: Variable 'a' is used before being assigned.