window not defined in web workers

[piotrblasiak]

The problem seems to be in browsers.js:

module.exports = window.fetch || (window.fetch = require('unfetch').default || require('unfetch'));

And I think this could be solved by replacing window with global?

[developit]

global is also not defined. We can use `self.

[eric-burel]

I hit the same issue when building from TypeScript, should I use a fork with this PR merged?