Require passing generated flow type for useMutation

Author: tyao1

src/rule-generated-flow-types.js

@@ -564,6 +564,24 @@ module.exports = {
         });
       },
 
+      /**
+       * Find useMutation() calls without type arguments.
+       */
+      'CallExpression[callee.name=useMutation]:not([typeArguments])'(node) {
+        const queryName = getDefinitionName(node.arguments[0]);
+        context.report({
+          node,
+          message: `The \`useMutation\` hook should be used with an explicit generated Flow type, e.g.: useMutation<{{queryName}}>(...)`,
+          data: {
+            queryName: queryName
+          },
+          fix:
+            queryName != null && options.fix
+              ? createTypeImportFixer(node, queryName, queryName)
+              : null
+        });
+      },
+
       /**
        * Find usePaginationFragment() calls without type arguments.
        */

test/test.js

@@ -901,6 +901,21 @@ import type {FooQuery} from './__generated__/FooQuery.graphql'
       ],
       output: null
     },
+    {
+      code: `\nconst mutation = graphql\`mutation FooMutation { id }\`;\nconst [commit] = useMutation(mutation);`,
+      options: DEFAULT_OPTIONS,
+      errors: [
+        {
+          message:
+            'The `useMutation` hook should be used with an explicit generated Flow type, e.g.: useMutation<FooMutation>(...)',
+          line: 3
+        }
+      ],
+      output: `
+import type {FooMutation} from './__generated__/FooMutation.graphql'
+const mutation = graphql\`mutation FooMutation { id }\`;
+const [commit] = useMutation<FooMutation>(mutation);`
+    },
     {
       code: `\ncommitMutation(environemnt, {mutation: graphql\`mutation FooMutation { id }\`})`,
       errors: [