Hi.

https://github.com/developit/unfetch/blob/master/packages/isomorphic-unfetch/index.js#L1

code uses module.exports, but definition is using export default, I think it should be export = in https://github.com/developit/unfetch/blob/master/packages/isomorphic-unfetch/index.d.ts#L17

and use with `import * as fetch from 'isomorphic-unfetch'

Related issue

• packages/isomorphic-unfetch/index.d.ts - Exports and export assignments are not permitted in module augmentations. #82