Update for js-promise migration

[thomashoneyman]

This updates the library to make use of js-promise instead of web-promise, including relying on a new fetch-core (another PR is open for that). This cannot be merged until the fetch-core PR merges, and then I can update the dependencies.

[thomashoneyman]

Hm — see: nodejs/node#46221

[sigma-andex]

lgtm, do you want to merge this?

[thomashoneyman]

This is failing because of the missing duplex: 'half' argument to requests with bodies (see the linked node issue above). Affects fetch-core, and via fetch-core affects this library as well. Not sure how you would like to handle that (set is as a default when a request has a body?)

[sigma-andex]

Ok I just read it. So yeah I guess we should set duplex: 'half' as default in fetch-core then

[thomashoneyman]

How do you want to do that? On the PureScript side or in the FFI file? It doesn't appear that fetch-core is setting any defaults right now.

[sigma-andex]

hmm yeah you are right. I don't know, what do you propose?

[thomashoneyman]

It isn't required on all bodies — just stream bodies — so I've just added it as another option and set it when necessary.