fetch api is not being intercepted by zones

[IgorMinar]

https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API

example usage:

fetch('foo.json').then(function(response) { return response.json() });

[vicb]

It should be as it returns a Promise.

[vicb]

Just submitted #112 to check what browsers need a patch.

Would be interesting to know if the browsers are supposed to return a new global.Promise() (ie is it a browser bug ?). Otherwise we'll probably need to patch more than fetch: Response.text() and the like

[vicb]

@IgorMinar from my tests the issue seems to be that fetch() does not instantiate a window.Promise but a (derived of) Promise.

That means that our monkey patch on window.Promise is not taken into account. This also means that would probably should patch all functions that returns a Promise.

Is this possible for you to check with the Chrome team if that's the current behavior is the desired one ?

[radotzki]

This bug is reproducible from zone.js 0.6.0.
My workaround:

return new Promise((resolve, reject) => {
  return window
    .fetch(url, fetchOptions)
    .then((response) => resolve(response.json()));
});