Incorrect "Cannot find name" when importing default value

[saschanaz]

TypeScript Version: 3.0.1

Search Terms: Cannot find name import default

Code

// fetch.d.ts
declare function fetch(url: string): Promise<any>;
export = fetch;
declare namespace fetch {
  export { fetch as default };
}

// index.ts
import f from "./fetch";
f("url"); // error TS2304: Cannot find name 'f'

Expected behavior: Name should be found

Actual behavior: Cannot find name. Interestingly import { default as f } from "./fetch"; works.

Playground Link: (It doesn't support modules :/)

Related Issues: Couldn't find one

[IIIristraM]

I also face the issue with default import from a js file with exports.default = Component. import Component from '...' worked fine in version 2.8.4 Now it woks only with import {default as Component} from '...'.

There is "allowSyntheticDefaultImports": true in my tsconfig, setting option to false resolves the issue, but creates much more troubles in my project.

Probably this is related issue.