Add method to check if module is already registered

[pkarw]

What is the motivation for adding / enhancing this feature?

We don't have a public method in VueStorefrontModule interface to check if the module has been already registered + list the registered modules.

It could be useful. For example, I wanted to check in payment-backend-methods if the ``payment-cash-on-delivery` has been registered and there was no way to do so

[filrak]

it's already added

[pkarw]

Where? :)

[filrak]

https://github.com/DivanteLtd/vue-storefront/blob/master/core/lib/module.ts#L54

[filrak]

also https://github.com/DivanteLtd/vue-storefront/blob/master/core/lib/module.ts#L40

[pkarw]

This is private, I can not use it from other modules / outside world to check which modules have been registered already. That was my point: I wanted to check in payment-backend-methods if the payment-cash-on-delivery has been registered and there was no way to do so. Still I don't see a way to do so :)

[filrak]

You're right. It was meant for internal use to avoid dependencys over modules but it can easly be moved outside and exported.

Will do it along with factory method refactor ok?

[pkarw]

Perfect!