fix(stitchSchemas): subschemas with object inputs and mergeTypes as true causes crash

[nicolas-cherel]

NOTE I've no idea if that fix is sufficient or if support of input object is otherwise supported

Without the proposed fix in typeCandidates.ts the added test case triggers the following error from expected unreachable code:

 FAIL  packages/stitch/tests/alternateStitchSchemas.test.ts (11.775 s)
  ● mergeTypes › can merge types

    Type ObjectInput has unknown GraphQL type.

      351 |   } else {
      352 |     // not reachable.
    > 353 |     throw new Error(`Type ${typeName} has unknown GraphQL type.`);
          |           ^
      354 |   }
      355 | }
      356 |

      at merge (packages/stitch/src/typeCandidates.ts:353:11)
      at packages/stitch/src/typeCandidates.ts:222:27
          at Array.forEach (<anonymous>)
      at Object.buildTypeMap (packages/stitch/src/typeCandidates.ts:212:31)
      at Object.stitchSchemas (packages/stitch/src/stitchSchemas.ts:98:19)
      at Object.<anonymous> (packages/stitch/tests/alternateStitchSchemas.test.ts:1989:37)

[nicolas-cherel]

rhaar borched the commit message :)

[yaacovCR]

@nicolas-cherel are you able to try this out using canary above?

Thanks for kicking this off!

[nicolas-cherel]

rebased with new upstream

[yaacovCR]

Looks like my changes got borched...

[nicolas-cherel]

ho sorry ! I cherry picked what I found it the previous sha1 log

[yaacovCR]

lol, simultaneously I was going to merge your initial test and do my changes as a separate PR.

[theguild-bot]

The latest changes of this PR are available as alpha in npm: 6.0.10-alpha-6059c40.0

Quickly update your package.json by running:

npx match-version @graphql-tools 6.0.10-alpha-6059c40.0

[yaacovCR]

Thanks again @nicolas-cherel for your work on this!