generics - TypeScript compiler confused with large inheritance/extension chain -

i have following (reasonably complex) extension chain. minimal reproducible example of problem (obviously classes have behavioural implementations in application).

export class basemodel {     public somebasemodelmethod(): void { } }  export class baseview {     public somebaseviewmethod(): void { } }  export class collectionview<tchildview extends baseview, tmodel extends basemodel>     extends baseview {     public somecollectionviewmethod(): void { } }  export class itemview<tmodel extends basemodel>     extends baseview {     public setitem(model: tmodel): void { } }  export interface igridview<tchildview extends itemview<tmodel>, tmodel extends basemodel>     extends collectionview<tchildview, tmodel> {     somegridviewmethod(): void; }  export class gridview<tchildview extends itemview<tmodel>, tmodel extends basemodel>     extends collectionview<tchildview, tmodel>     implements igridview<tchildview, tmodel> {     public somegridviewmethod(): void { } }  function bind<tinterface>(key: string, implementation: new (...args: any[]) => tinterface) {     // bindings here }  bind<igridview<itemview<basemodel>, basemodel>>("igridview", gridview); 

when compile, error on gridview part of final line (the bind statement). error follows:

ts2345 argument of type 'typeof gridview' not assignable parameter of type 'new (...args: any[]) => igridview<itemview<basemodel>, basemodel>'.     type 'collectionview<any, any>' not assignable type 'igridview<itemview<basemodel>, basemodel>'.         property 'somegridviewmethod' missing in type 'collectionview<any, any>'. 

as can see, expecting somegridviewmethod on collectionview. however, gridview extends collectionview, why expecting find gridview methods on collectionview class?

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the code compiles correctly in 2.0.3, not in 1.8.10.

this compiles fine in both 1.8.x , 2.x:

type typedgridview = { new (...args: any[]): igridview<itemview<basemodel>, basemodel> };  function bind<tinterface>(key: string, implementation: new (...args: any[]) => tinterface) {     // bindings here }  bind("igridview", gridview typedgridview); 

(code in playground)

it seems 1.8.x compiler fails recognize gridview constructor to:

igridview<itemview<basemodel>, basemodel>