typeB.ts

import * as Types from './types';
export type Resolver<T> = {
 [U in keyof Partial<typeof Types>]: {
 [P in keyof Partial<T>]: (parent: T, args: any, ctx: Context, info: GraphQLResolveInfo) => any
 }
};

types.ts

// file: types.ts
import * as Api from './generated/api';
// export one variable of each type
export const Notifications: Api.Notifications;
export const User: Api.User;