[Potential feature request] Is it possible to access the underlying class/constructor of a registration?

[udnes99]

It would be really awesome if it was possible to access the original constructor/class type of registrations in Awilix. This is especially useful when accessing dynamically loaded modules that were registered using loadModules. Being able to access this, would allow us to get information about the prototype chain, and in runtime determine if a registration's instance is of a particular known prototype.

[jeffijoe]

The simplest thing I can think of is to expose like a source property on asFunction's and asClass's resolver objects, then you'd be able to do if ('source' in resolver) (iterating on container.registrations). Would that be sufficient for what you're trying to do?

Could you give me a more concrete use case for this?

[udnes99]

That would be perfect! My current use case is to dynamically find all classes that I have loaded using loadModules that extend a particular base class. In our case, we want to determine all kinds of domain events in our applications. This would be trivial if we could iterate all registrations and find all registrations with a 'source' that has the prototype of our base class (in this case DomainEvent). I can also see how this can be useful in other cases because it enables us to perform a bit of reflection when some parts of the prototype chain is known.

[jeffijoe]

What you can do in the meantime is basically implement your own resolver that wraps asClass and stores the source on there.

function asDomainEvent(Type) {
  return {
    ...asClass(Type),
    source: Type
  }
}

[udnes99]

That sounds like a great workaround 🙌 I will look more into it tomorrow. Is it something you would consider being exposed directly through the registrations? Thanks for the quick replies! :)

[jeffijoe]

Yeah I'll consider it if there's enough demand. 😄