add MSW

[phryneas]

This would add the upcoming v2 of msw to the Repo.

I see upsides and downsides here:

Downsides:

• mocking operations by operation name instead of fieldname seems like a wonky api to me

Upsides:

• this really uses HttpLink, so we can use it to reproduce errors with HttpLink

I might look into opening a PR for a graphql.schema response handler that would allow us to plug a real GraphQL schema in there.
While this API is shorter than defining a schema, it's also pretty far away from GraphQL.

[kettanaito]

Hi, @phryneas 👋 As I've mentioned on Twitter, you may want to look at this example. You can use the graphql package to resolve any intercepted GraphQL operations against a mock schema even as of now! The simplicity of it makes me think there'd be little practical benefit of introducing something like graphql.schema(), although I've thought about it myself in the past. Perhaps your use cases can prove me wrong, that'd be great.

import { graphql as executeGraphQL, buildSchema } from 'graphql'
import { graphql, HttpResponse } from 'msw'

const schema = buildSchema(`
  type Query {
    greet: String!
  }
`)

graphql.operation(({ query, variables }) => {
  const { errors, data } = await executeGraphQL({
    schema,
    source: query,
    variableValues: variables,
    // Your resolvers here.
    rootValue: {
      greet: () => 'Hello, John!'
    }
  })

  return HttpResponse.json({ errors, data })
})