Type definitions overshadowing

TypeScript Version: 3.8.3

(also tried 3.9.0-dev.20200310)

Search Terms:
"Module '"immutable"' has no exported member"

Code

(not self contained)

import { hash } from "immutable";

export function test(): number {
    return hash(1);
}

Actual behavior:

src/index.ts:1:10 - error TS2305: Module '"immutable"' has no exported member 'hash'.

1 import { hash } from "immutable";
           ~~~~

even though
grep "export function hash" node_modules/immutable/dist/immutable.d.ts
reveals
export function hash(value: any): number;

Because it uses type definitions in
node_modules/@types/draft-js/node_modules/immutable/dist/immutable.d.ts
instead of
node_modules/immutable/dist/immutable.d.ts

Demo:

sadly I did not find any way to put it in a playground, in any case:
https://gitlab.com/rawieo/issue_demo_1

Related Issues:

• https://github.com/facebook/create-react-app/issues/8578
• https://github.com/immutable-js/immutable-js/issues/1502 (probably)

src/index.ts から始め、node_modules/immutable/dist/immutable.d.ts と node_modules/@types/draft-js/node_modules/immutable/dist/immutable.d.ts の宣言を比較します。TypeScript 3.8.3 または記載されている nightly バージョンで import を再現し、その後モジュール解決を追跡して、なぜネストされた定義が選択されるのかを理解します。hash の有効な export が TS2305 なしで解決されれば完了です。