As seen in TeamService2.ts, the Contextual type will add Context as the
last argument to any method of the interface, as long as the method has
0-4 arguments.
Interfaces with more than 4 arguments cannot use this type, but they
could be converted to interfaces which use 1 argument
(object/dictionary) only.
Some long-term thinking: Maybe only methods with a single argument
should be supported, similar to the way gRPC does it.
In this case the interface does not define context, but the implementing
service may use it as an optional argument:
interface IService {
add(a: number, b: number): number
}
class Service implements IService {
add(a: number, b: number, ctx?: IContext): number {
return a + b + ctx!.userId
}
}
