var Foo = require('Foo');
Foo.prototye.componentDidMount = () => {};
I import Foo, but for the case that I use it, I want to override the componentDidMount function on it's prototype. I know this is a hack : (
If I do this, I worry that in other cases where Foo is used, it's prototype will also be changed.
Is there a way to essentially "scope" changing the prototype to within this file?
No. The constructor exists globally. You can, however, make a subclass of Foo if you have access to its constructor. In your example, it seems like a Foo instance is being imported, not a constructor, so I'm not sure yet that's an option. But here's what you'd do.
function Bar() {
// ...
}
Bar.prototype = new FooConstructor(); // Must be a separate instance!
Bar.prototype.bar = () => {};
var MyFooExtension = new Bar();
EDIT: Forgot, most objects should have a constructor property. So you may be able to replace this line:
Bar.prototype = new Foo.constructor();
