Derived class should't re-define inherited members

[aidinabedi]

Currently, if a class extends another, all base members will be re-defined in the extended class. So the following JS code:

/**
 *
 */
class BaseClass {
    /**
     *
     */
    baseFunc() {}
    /**
     *
     */
    baseFuncOverridden() {}
}

/**
 * @extends BaseClass
 */
class DerivedClass extends BaseClass {
    /**
     *
     */
    derivedFunc() {}
    /**
     *
     */
    baseFuncOverridden() {}
}

Will result in the following typescript code

declare class BaseClass {
    baseFunc(): void;
    baseFuncOverridden(): void;
}

declare class DerivedClass extends BaseClass {
    derivedFunc(): void;
    baseFuncOverridden(): void;
    baseFunc(): void; // <-- REDFINED BASE CLASS MEMBER
}

Althought this might seem fine, it can actually causes issues in multiple cases. Such as if the derived class is private, because then tsd-jsdoc tries to re-define public base members in a private derived class, which results in the following:

[TSD-JSDoc] Failed to find parent of doclet 'baseFunc' using memberof 'DerivedClass', this is likely due to invalid JSDoc.
[TSD-JSDoc] Failed to find parent of doclet 'baseFuncOverridden' using memberof 'DerivedClass', this is likely due to invalid JSDoc.

And when you have many such cases the log is filled with warnings that shouldn't be there.