Unexpected type assertion result

<!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. --> **TypeScript Version:** 3.6.0-dev.20190801 <!-- Search terms you tried before logging this (so others can find this issue more easily) --> **Search Terms:** - `type assertion absolute import` - `type assertion import` - `type cast absolute import` - `type cast import` - `type assertion pick` **Code** **Repo**: https://github.com/klemenoslaj/typescript-type-assertion `generated/types.d.ts` --- ```typescript export interface TypeD { da: string; db: string; dc: string; } export interface Test { a: string; b: string; c: string; d?: { __private: 'd' } & TypeD; } ``` `src/index.model.ts` --- ```typescript import { Test } from 'generated/types'; type DType = NonNullable<Test['d']>; export type Model = Pick<DType, keyof Exclude<DType, '__private'>>; ``` `src/index.ts` --- ```typescript import { Model } from './index.model'; export class A { value = <Model>{}; } ``` `dist/index.model.d.ts` --- ```typescript import { Test } from 'generated/types'; declare type DType = NonNullable<Test['d']>; export declare type Model = Pick<DType, keyof Exclude<DType, '__private'>>; export {}; ``` `dist/index.d.ts` --- ```typescript export declare class A { value: Pick<{ __private: "d"; } & import("../generated/types").TypeD, "__private" | "da" | "db" | "dc">; } ``` **Expected behavior:** I would expect that `dist/index.d.ts` type definitions would result in: ```typescript import { Model } from './index.model'; export declare class A { value: Model; } ``` In fact, this is the result of type definitions, if I change `value = <Model>{};` to `value: Model = <Model>{};`. Why doesn't typescript use `Model` directly when type asserting? **Actual behavior:** Results in: ```typescript export declare class A { value: Pick<{ __private: "d"; } & import("../generated/types").TypeD, "__private" | "da" | "db" | "dc">; } ``` **Playground Link:** I couldn'…