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)

Start with src/index.ts and compare the declarations in node_modules/immutable/dist/immutable.d.ts and node_modules/@types/draft-js/node_modules/immutable/dist/immutable.d.ts. Reproduce the import with TypeScript 3.8.3 or the noted nightly version, then trace module resolution to understand why the nested definitions are selected. Done means the valid hash export resolves without TS2305.