transformsResponse returns data as a string, vs a JSON object

[stephenbaldwin]

api.mount('ExampleQuery')
      .transformResponse(
         (response) => {
             const json = JSON.parse(response); // Response is a string. It should already be an object
          }
      )

[Mk-Etlinger]

Hey @stephenbaldwin, I made some progress here but I want to run it by you before I submit a PR.

If you look at https://github.com/Econify/graphql-rest-router/blob/master/Router.ts#L53-L61

You'll see the config for axios and since we're not including transformResponse, there's no default behavior.

Edit: After digging into this issue a bit more, I was on the wrong track above. More accurately, by using transformReponse and giving it your own transform function, we're overriding the default. This issue is about maintaining the default transformResponse even when you're using your own custom transform as well.