Fetch API definitions

[myitcv]

Apologies if this is mentioned elsewhere, but I couldn't find an issue/PR that mentions it.

The Fetch API is still experimental, but I assume its definitions will make their way into TypeScript core at some point?

[myitcv]

Reference the current DefinitelyTyped definitions.

[danquirk]

Yes, when an API is standardized/well supported we'll make sure it's in lib.d.ts (or whatever appropriate sub component). We generally generate these libraries from spec's so we don't need issues per new API. In the meantime if you're hoping for improvements to the DefinitelyTyped definitions that's something we should track with an issue over there.

[myitcv]

@danquirk - thanks, we're raising a PR to fix up one deviation from the spec.

Still not supported ?

[heruan]

Now that libs are split into multiple includable files, I think the fetch definition should be added in one of those lib files or in its own one.

[mhegazy]

PRs welcomed. You can find more information about contributing lib.d.ts fixes at https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md#contributing-libdts-fixes.