How can I iterate over exported types in a barrel?

Here I’d like Key to be any of the exported type names in seeds.
And I would like to be able to access types by name from a barrel import.
If I use keyof typeof seeds, it’s stripping out all the types in seeds
Is it even possible?

For instance, with these files:
types.ts

export type TypeA = {
  a: number;
  b: string;
}

export type TypeB = {
  c: number;
  d: string;
}

index.ts

import * as types from './types';

type MyType = Partial<{
  [Key in keyof types]: types[Key][];
}>;

I’d like MyType to be

type MyType = Partial<{
  "TypeA": TypeA[];
  "TypeB": TypeB[]
}>;