JavaScript Interfaces with stampit 2

As mentioned in the interface section of 'Programming javascript applications' you can implement interfaces with stampit. When reducing the unnecessary stuff from the example, I end up with something like this:

const fooBarInterface = 
    stampit()
        .methods(
            {
                foo: () => {
                    throw new Error('connect not implemented'); 
            },
                bar: () => {
                    throw new Error('save not implemented');
            }
        }
    )

Excerpt from an interface definition:

If your class claims to implement an interface, all methods defined by that interface must appear in its source code before the class will successfully compile.

So now putting the interface in use

const fooBarImplementation = 
    stampit()
        .compose(fooBarInterface)
        .methods(
            {
                foo: () => {
                    // implement me
                }
            }
        }
    )

Now, when composing an object from the stamp, there should be an error because bar is not implemented by fooBarImplementation. It isn't, and I fear that it's pretty hard to get something like this in place because there is no compiling at all.

So, my question is: Am I doing it wrong or is this half baked thing what Eric Elliott calls an 'Interface'?

Answer:1

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