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)

Commencez par src/index.ts et comparez les déclarations dans node_modules/immutable/dist/immutable.d.ts et node_modules/@types/draft-js/node_modules/immutable/dist/immutable.d.ts. Reproduisez l’import avec TypeScript 3.8.3 ou la version nightly indiquée, puis suivez la résolution des modules pour comprendre pourquoi les définitions imbriquées sont sélectionnées. C’est terminé lorsque l’export hash valide se résout sans TS2305.