error

{
  "errors": [
    {
      "message": "Argument \"input\" expected type \"UploadFileByUrlInput!\" but got: {url: foo}.",
      "locations": [
        {
          "line": 1,
          "column": 35
        }
      ]
    }
  ]

query

curl localhost:4001 -H 'Content-Type: application/graphql' -d 'mutation M{uploadFileByUrl(input: {url: 'foo'}) { clientMutationId } }'

schema.js

var UploadFileByUrlMutation = mutationWithClientMutationId({
  name: 'UploadFileByUrl',
  inputFields: {
    url: {
      type: new GraphQLNonNull(GraphQLString),
    },
  },
  outputFields: {
    file: {
      type: fileType,
      resolve: (payload) => payload,
    },
    viewer: {
      type: viewerType,
      resolve: getViewer,
    }
  },
  mutateAndGetPayload: uploadFileByUrl,
})

var mutationType = new GraphQLObjectType({
  name: 'Mutation',
  fields: () => ({
    uploadFileByUrl: UploadFileByUrlMutation
  })
});

export var Schema = new GraphQLSchema({
  query: queryType,
  mutation: mutationType
});