test: make sure __typename doesn't get output for input types

Author: jedwards1211

test/graphql-typegen-async/useMutationAddTypename.ts

@@ -0,0 +1,82 @@
+import * as path from 'path'
+
+export const file = 'file.js'
+
+export const input = `
+// @flow
+import * as React from 'react'
+import { useMutation } from '@apollo/react-hooks'
+import gql from 'graphql-tag'
+
+const mutation = gql\`
+mutation createReview($episode: Episode!, $review: ReviewInput!) {
+  createReview(episode: $episode, review: $review) {
+    episode
+    stars
+    commentary
+  }
+}
+\`
+
+const Comp = ({id: string}): React.Node => {
+  const [createReview] = useMutation(mutation)
+  return <div />
+}
+`
+
+export const options = {
+  schemaFile: path.resolve(__dirname, '../../starwars.graphql'),
+}
+
+export const expected = `
+// @flow
+import * as React from 'react'
+import { useMutation, type MutationFunction } from '@apollo/react-hooks'
+import gql from 'graphql-tag'
+
+const mutation = gql\`
+mutation createReview($episode: Episode!, $review: ReviewInput!) {
+  createReview(episode: $episode, review: $review) {
+    episode
+    stars
+    commentary
+  }
+}
+\`
+
+// @graphql-typegen auto-generated
+type CreateReviewMutationFunction = MutationFunction<
+  CreateReviewMutationData,
+  CreateReviewMutationVariables
+>
+
+// @graphql-typegen auto-generated
+type CreateReviewMutationVariables = {
+  episode: 'NEWHOPE' | 'EMPIRE' | 'JEDI',
+  review: {
+    stars: number,
+    commentary?: ?string,
+    favorite_color?: ?{
+      red: number,
+      green: number,
+      blue: number,
+    }
+  }
+}
+
+// @graphql-typegen auto-generated
+type CreateReviewMutationData = {
+  __typename: 'Mutation',
+  createReview: ?{
+    __typename: 'Review',
+    episode: ?('NEWHOPE' | 'EMPIRE' | 'JEDI'),
+    stars: number,
+    commentary: ?string,
+  },
+}
+
+const Comp = ({id: string}): React.Node => {
+  const [createReview] = useMutation<CreateReviewMutationData, CreateReviewMutationVariables>(mutation)
+  return <div />
+}
+`