Orange.Modularity.inject should have ability to optional register resolved instance

[jonatannyberg]

It would be useful to tell the Orange.Modularity.inject decorator to register an instance of a specific type if it has not already been registered in the container.

Something like this maybe: (if possible)

@Orange.Modularity.inject({
    register: [ FooBar ]
})
class Foo {
    constructor(bar: Bar, fobar: FooBar) { }
}

[markusjohnsson]

It seams weird to me that Foo should control the lifetime of FooBar. That should be up to either a all-knowing module or to FooBar itself.

I'd rather have:

// causes FooBar to register as singleton the first time it is resolved.
@Orange.Modularity.singleton 
class FooBar 
{
}