It would be really useful if fetchOptions could allow to return a promise

[richtera]

I created a simple version of this by copying the fetch.ts file and allowing fetchOptions to return a promise. The benefit is that if you have to wait for an access_token or anything you don't need to add logic to each of your urql queries. Is this something that's worth a pull request? I tried to make it an exchange, but there is no standard delay pipe operation in wonka so I gave up.

[kitten]

Duplicate of #234

This can also be done by writing a small exchange for modifying it on the fly.

Docs for Wonka are in progress and coming soon

[richtera]

Any guidance how to write such exchange? I played around with this for about an hour or two.
Essentially I was unable to delay operations in the pipe until the token was available. I tried to subscibe to the original data and then sending it back out using a makeSubject, but that just caused a whole bunch of exceptions because it was expecting data instead of an uncompleted operation.