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graphql.link() doesn't intercept request

See original GitHub issue

Environment

Name	Version
msw	0.20.5
node	12.18.3
OS	Ubuntu 20.04

Request handlers


  const serloApi = graphql.link('https://api.serlo.org/graphql')
  global.server.use(
    serloApi.query('_cacheKeys', async(req, res, ctx) =>{
      return res(
        ctx.data(
          await server.executeOperation({
            query: worker.queryLiteral,
          } as GraphQLRequest)
        )
      )
    })
  )
})

Actual request

import { GraphQLClient, gql } from 'graphql-request'
...
 private query = gql`{ _cacheKeys (first: 5, after: ...
await this.grahQLClient.request(this.query).then(async (data) =>  console.log('data: ', data))
...

Current behavior

The request by-passes the interceptor and goes to the actual server, which responds with 400 (since the feature doesn’t exit yet).

Cannot query field "_cacheKeys" on type "Query".: {"response":{"errors":[{"message":"Cannot query field \"_cacheKeys\" on type \"Query\".","locations":[{"line":2,"column":7}],"extensions":{"code":"GRAPHQL_VALIDATION_FAILED"}}],"status":400},"request":{"query":"\n    { _cacheKeys (first: 5, after: \"\") { edges { cursor node } nodes totalCount  pageInfo { hasNextPage hasPreviousPage startCursor endCursor } } }\n  "}}

Expected behavior

To get the same response that I have when I mock the GraphQL server using the rest object

    data:  {
      _cacheKeys: {
        edges: [ [Object], [Object], [Object], [Object], [Object] ],
        nodes: [ 'key0', 'key1', 'key2', 'key3', 'key4' ],
        totalCount: 25,
        pageInfo: {
          hasNextPage: true,
          hasPreviousPage: false,
          startCursor: 'a2V5MA==',
          endCursor: 'a2V5NA=='
        }
      }
    }