Java Refactoring – Refactoring Code Dependent on Renamed Library Method

The IDE-based niceties are not available* in a dynamic language such as javascript. You have to learn to do without them. You'll have to replace tool support with better design.

Use a module pattern -- either by hand, or with a tool like requirejs. Keep the modules small, so that you can reason about them easily.

Don't define as many types -- use anonymous objects created close to the point of call. Then you can look at the caller and the callee and know what's going on.

Try to avoid coupling your code to the DOM -- Try hard to limit the amount of DOM manipulation you do in your code. If you can pass in selectors or jQuery collections, do that rather than having your code know about the page structure.

*_{If you're using a popular library, you can get fake autocomplete, but it's more like "show all jquery methods" than like "what properties does this object have". It saves typing, but offers no guarantee of correctness.}

This is a refinement of @user2670177 answer:

If the function signatures of both are nearly the same it might be easier to use inheritance instead of composition.

Given you have Oranges and Appels you want to process

class Orange {
    public void setColor(Color color){}
    public void setPrice(int euroCents){}
    public void setCount(int numberOfItems){}
}

class Apple {
    public void setColor(Color color){}
    public void setPrice(int euroCents){}
    public void setCount(int numberOfItems){}
}

You can define a common interface for both

interface MyFruitInterface{
    void setColor(Color color);
    void setPrice(int euroCents);
    void setCount(int numberOfItems);
}

and attach the interface to the inherited class

class MyOrangeImpl extends Orange implements MyFruitInterface {
} 

class MyAppleImpl extends Apple implements MyFruitInterface {
} 

Now your common code MQObject can handle both:

class MQObject {
    private MyFruitInterface fruit;
    MQObject(MyFruitInterface fruit) {
        this.fruit = fruit;
    }

    void setPriceColorCount(int euroCents, Color color, int numberOfItems) {
        fruit.setPrice(euroCents);
        fruit.setColor(color);
        fruit.setCount(numberOfItems);
    }
}

void testMQ() {
    MQObject applMQObject = new MQObject(new MyAppleImpl());
    MQObject orangeMQObject = new MQObject(new MyOrangeImpl());
}