Adds a "graphql.link" API

[kettanaito]

Changes

• Isolates request matching logic (resolved/clean mask, match) into its own utility.
• Exposes matchRequestUrl in the public API:

import { matchRequestUrl } from 'msw'

matchRequestUrl(req.url, '*/your/mask')

This would allow developers to create custom request handlers (#290) with the native MSW request matching logic embedded.

• Request matching is now performed in the "parse" phase for rest. This allows us to match request URL against a mask once, so we don't have to do this again to get request params later on.
• Reuses the request matching utility for rest and graphql API.
• Adds graphql.link API that allows to define per-endpoint GraphQL operations mocking.

import { graphql } from 'msw'

const github = graphql.link('https://api.github.com/graphql')
const stripe = graphql.link('https://api.stripe.com/graphql')

github.query('GetUser', resolver)
stripe.mutation('Payment', resolver)

GitHub

• Fixes Support multiple GraphQL endpoints #315

[kettanaito]

@chrisguttandin, hey, Chris! Please, do you have a chance to review these changes? Your feedback would be highly appreciated. Thanks!

[marcosvega91]

LGTM

[chrisguttandin]

Hi @kettanaito, was that maybe a mistake to ping me? I'm happy to take a look but I'm not GraphQL user and therefore can't really give any meaningful feedback.

[kettanaito]

@chrisguttandin, it's okay, these changes are not related to the actual GraphQL knowledge :) If you have a minute, I'd appreciate you to look as well.

@marcosvega91, thank you for the review!

[kettanaito]

If you don't mind, I'm merging this, would love to ship this to hear people's feedback.