class MyClass {

    // Warning saying that "This item is never used"
    private myString1: string;

    // Warning saying that "This item has been assigned to but is never used"
    private myString2: string = 'abc123';

    // No Warning since this could be used anywhere (such as an external library)  
    public myString3: string = '123456';

    // Warning saying that "This item is never used"
    private myMethod1(): void { }

    // No Warning since this could be used anywhere (such as an external library)    
    public myMethod2(): void { }

}

class MyClass2 extends MyClass { }