customEventDetail.ts(4,1): error TS2454: Variable 'x' is used before being assigned.
customEventDetail.ts(5,9): error TS2454: Variable 'x' is used before being assigned.


==== customEventDetail.ts (2 errors) ====
    var x: CustomEvent;
    
    // valid since detail is any
    x.initCustomEvent('hello', true, true, { id: 12, name: 'hello' });
    ~
!!! error TS2454: Variable 'x' is used before being assigned.
    var y = x.detail.name;
            ~
!!! error TS2454: Variable 'x' is used before being assigned.