Change:
} } <del> export interface CreateSyncFunc { <T>(ctor: instantiation.IConstructorSignature0<T>): SyncDescriptor0<T>; <A1, T>(ctor: instantiation.IConstructorSignature1<A1, T>): SyncDescriptor1<A1, T>; <A1, T>(ctor: instantiation.IConstructorSignature1<A1, T>, a1: A1): SyncDescriptor0<T>; <A1, A2, T>(ctor: instantiation.IConstructorSignature2<A1, A2, T>): SyncDescriptor2<A1, A2, T>; <A1, A2, T>(ctor: instantiation.IConstructorSignature2<A1, A2, T>, a1: A1): SyncDescriptor1<A2, T>; <A1, A2, T>(ctor: instantiation.IConstructorSignature2<A1, A2, T>, a1: A1, a2: A2): SyncDescriptor0<T>; <A1, A2, A3, T>(ctor: instantiation.IConstructorSignature3<A1, A2, A3, T>): SyncDescriptor3<A1, A2, A3, T>; <A1, A2, A3, T>(ctor: instantiation.IConstructorSignature3<A1, A2, A3, T>, a1: A1): SyncDescriptor2<A2, A3, T>; <A1, A2, A3, T>(ctor: instantiation.IConstructorSignature3<A1, A2, A3, T>, a1: A1, a2: A2): SyncDescriptor1<A3, T>; <A1, A2, A3, T>(ctor: instantiation.IConstructorSignature3<A1, A2, A3, T>, a1: A1, a2: A2, a3: A3): SyncDescriptor0<T>; <A1, A2, A3, A4, T>(ctor: instantiation.IConstructorSignature4<A1, A2, A3, A4, T>): SyncDescriptor4<A1, A2, A3, A4, T>; <A1, A2, A3, A4, T>(ctor: instantiation.IConstructorSignature4<A1, A2, A3, A4, T>, a1: A1): SyncDescriptor3<A2, A3, A4, T>; <A1, A2, A3, A4, T>(ctor: instantiation.IConstructorSignature4<A1, A2, A3, A4, T>, a1: A1, a2: A2): SyncDescriptor2<A3, A4, T>; <A1, A2, A3, A4, T>(ctor: instantiation.IConstructorSignature4<A1, A2, A3, A4, T>, a1: A1, a2: A2, a3: A3): SyncDescriptor1<A4, T>; <A1, A2, A3, A4, T>(ctor: instantiation.IConstructorSignature4<A1, A2, A3, A4, T>, a1: A1, a2: A2, a3: A3, a4: A4): SyncDescriptor0<T>; <A1, A2, A3, A4, A5, T>(ctor: instantiation.IConstructorSignature5<A1, A2, A3, A4, A5, T>): SyncDescriptor5<A1, A2, A3, A4, A5, T>; <A1, A2, A3, A4, A5, T>(ctor: instantiation.IConstructorSignature5<A1, A2, A3, A4, A5, T>, a1: A1): SyncDescriptor4<A2, A3, A4, A5, T>; <A1, A2, A3, A4, A5, T>(ctor: instantiation.IConstructorSignature5<A1, A2, A3, A4, A5, T>, a1: A1, a2: A2): SyncDescriptor3<A3, A4, A5, T>; <A1, A2, A3, A4, A5, T>(ctor: instantiation.IConstructorSignature5<A1, A2, A3, A4, A5, T>, a1: A1, a2: A2, a3: A3): SyncDescriptor2<A4, A5, T>; <A1, A2, A3, A4, A5, T>(ctor: instantiation.IConstructorSignature5<A1, A2, A3, A4, A5, T>, a1: A1, a2: A2, a3: A3, a4: A4): SyncDescriptor1<A5, T>; <A1, A2, A3, A4, A5, T>(ctor: instantiation.IConstructorSignature5<A1, A2, A3, A4, A5, T>, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5): SyncDescriptor0<T>; <A1, A2, A3, A4, A5, A6, T>(ctor: instantiation.IConstructorSignature6<A1, A2, A3, A4, A5, A6, T>): SyncDescriptor6<A1, A2, A3, A4, A5, A6, T>; <A1, A2, A3, A4, A5, A6, T>(ctor: instantiation.IConstructorSignature6<A1, A2, A3, A4, A5, A6, T>, a1: A1): SyncDescriptor5<A2, A3, A4, A5, A6, T>; <A1, A2, A3, A4, A5, A6, T>(ctor: instantiation.IConstructorSignature6<A1, A2, A3, A4, A5, A6, T>, a1: A1, a2: A2): SyncDescriptor4<A3, A4, A5, A6, T>; <A1, A2, A3, A4, A5, A6, T>(ctor: instantiation.IConstructorSignature6<A1, A2, A3, A4, A5, A6, T>, a1: A1, a2: A2, a3: A3): SyncDescriptor3<A4, A5, A6, T>; <A1, A2, A3, A4, A5, A6, T>(ctor: instantiation.IConstructorSignature6<A1, A2, A3, A4, A5, A6, T>, a1: A1, a2: A2, a3: A3, a4: A4): SyncDescriptor2<A5, A6, T>; <A1, A2, A3, A4, A5, A6, T>(ctor: instantiation.IConstructorSignature6<A1, A2, A3, A4, A5, A6, T>, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5): SyncDescriptor1<A6, T>; <A1, A2, A3, A4, A5, A6, T>(ctor: instantiation.IConstructorSignature6<A1, A2, A3, A4, A5, A6, T>, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6): SyncDescriptor0<T>; <A1, A2, A3, A4, A5, A6, A7, T>(ctor: instantiation.IConstructorSignature7<A1, A2, A3, A4, A5, A6, A7, T>): SyncDescriptor7<A1, A2, A3, A4, A5, A6, A7, T>; <A1, A2, A3, A4, A5, A6, A7, T>(ctor: instantiation.IConstructorSignature7<A1, A2, A3, A4, A5, A6, A7, T>, a1: A1): SyncDescriptor6<A2, A3, A4, A5, A6, A7, T>; <A1, A2, A3, A4, A5, A6, A7, T>(ctor: instantiation.IConstructorSignature7<A1, A2, A3, A4, A5, A6, A7, T>, a1: A1, a2: A2): SyncDescriptor5<A3, A4, A5, A6, A7, T>; <A1, A2, A3, A4, A5, A6, A7, T>(ctor: instantiation.IConstructorSignature7<A1, A2, A3, A4, A5, A6, A7, T>, a1: A1, a2: A2, a3: A3): SyncDescriptor4<A4, A5, A6, A7, T>; <A1, A2, A3, A4, A5, A6, A7, T>(ctor: instantiation.IConstructorSignature7<A1, A2, A3, A4, A5, A6, A7, T>, a1: A1, a2: A2, a3: A3, a4: A4): SyncDescriptor3<A5, A6, A7, T>; <A1, A2, A3, A4, A5, A6, A7, T>(ctor: instantiation.IConstructorSignature7<A1, A2, A3, A4, A5, A6, A7, T>, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5): SyncDescriptor2<A6, A7, T>; <A1, A2, A3, A4, A5, A6, A7, T>(ctor: instantiation.IConstructorSignature7<A1, A2, A3, A4, A5, A6, A7, T>, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6): SyncDescriptor1<A7, T>; <A1, A2, A3, A4, A5, A6, A7, T>(ctor: instantiation.IConstructorSignature7<A1, A2, A3, A4, A5, A6, A7, T>, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7): SyncDescriptor0<T>; <A1, A2, A3, A4, A5, A6, A7, A8, T>(ctor: instantiation.IConstructorSignature8<A1, A2, A3, A4, A5, A6, A7, A8, T>): SyncDescriptor8<A1, A2, A3, A4, A5, A6, A7, A8, T>; <A1, A2, A3, A4, A5, A6, A7, A8, T>(ctor: instantiation.IConstructorSignature8<A1, A2, A3, A4, A5, A6, A7, A8, T>, a1: A1): SyncDescriptor7<A2, A3, A4, A5, A6, A7, A8, T>; <A1, A2, A3, A4, A5, A6, A7, A8, T>(ctor: instantiation.IConstructorSignature8<A1, A2, A3, A4, A5, A6, A7, A8, T>, a1: A1, a2: A2): SyncDescriptor6<A3, A4, A5, A6, A7, A8, T>; <A1, A2, A3, A4, A5, A6, A7, A8, T>(ctor: instantiation.IConstructorSignature8<A1, A2, A3, A4, A5, A6, A7, A8, T>, a1: A1, a2: A2, a3: A3): SyncDescriptor5<A4, A5, A6, A7, A8, T>; <A1, A2, A3, A4, A5, A6, A7, A8, T>(ctor: instantiation.IConstructorSignature8<A1, A2, A3, A4, A5, A6, A7, A8, T>, a1: A1, a2: A2, a3: A3, a4: A4): SyncDescriptor4<A5, A6, A7, A8, T>; <A1, A2, A3, A4, A5, A6, A7, A8, T>(ctor: instantiation.IConstructorSignature8<A1, A2, A3, A4, A5, A6, A7, A8, T>, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5): SyncDescriptor3<A6, A7, A8, T>; <A1, A2, A3, A4, A5, A6, A7, A8, T>(ctor: instantiation.IConstructorSignature8<A1, A2, A3, A4, A5, A6, A7, A8, T>, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6): SyncDescriptor2<A7, A8, T>; <A1, A2, A3, A4, A5, A6, A7, A8, T>(ctor: instantiation.IConstructorSignature8<A1, A2, A3, A4, A5, A6, A7, A8, T>, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7): SyncDescriptor1<A8, T>; <A1, A2, A3, A4, A5, A6, A7, A8, T>(ctor: instantiation.IConstructorSignature8<A1, A2, A3, A4, A5, A6, A7, A8, T>, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7, a8: A8): SyncDescriptor0<T>; } export const createSyncDescriptor: CreateSyncFunc = <T>(ctor: any, ...staticArguments: any[]): any => { return new SyncDescriptor<T>(ctor, staticArguments); }; </del> export interface SyncDescriptor0<T> { ctor: any; bind(): SyncDescriptor0<T>;

Discussion:
I a service injection dependency to some class and ended up with a very confusing TS error from a line that called . It turns out that you can't call it for a service with more than 8 dependencies because of how is defined. It's not a problem for me anymore because that function is barely used anywhere and I just changed to using the SyncDescriptor constructor directly. I wonder whether we should delete it or fix the definition of to have a definition that takes arbitrary #s of arguments, but I don't know what the intent of this code is. You touched this at some point maybe you know something about it.
This should be more or less adding one more of those. Tho, maybe there is newer, fancier ways in TS nowadays
That helper is only used in 1 place though. And we call directly in 200+ places. Just pointing that out too.
Assigning to who is that one user of 
What am I supposed to do?
Read this issue?
tldr; you are the only user of , either remove your usage or take ownership, e.g keep in line with its base class
I do not recall adding this method and it is outside of the history of GH, but it seems it so I let him decide to "either remove your usage or take ownership". The easiest is probably to inline it.