GraphQL: Print arguments for FieldDefinition (#2314)

src/printer-graphql.js

@@ -233,7 +233,29 @@ function genericPrint(path, options, print) {
     }
 
     case "FieldDefinition": {
-      return concat([path.call(print, "name"), ": ", path.call(print, "type")]);
+      return concat([
+        path.call(print, "name"),
+        n.arguments.length > 0
+          ? group(
+              concat([
+                "(",
+                indent(
+                  concat([
+                    softline,
+                    join(
+                      concat([ifBreak("", ", "), softline]),
+                      path.map(print, "arguments")
+                    )
+                  ])
+                ),
+                softline,
+                ")"
+              ])
+            )
+          : "",
+        ": ",
+        path.call(print, "type")
+      ]);
     }
 
     case "DirectiveDefinition": {

tests/graphql_object_type_def/__snapshots__/jsfmt.spec.js.snap

@@ -1,5 +1,16 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`arguments.graphql 1`] = `
+type Video {
+  playable_url(quality: String, preferred: String): Url
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+type Video {
+  playable_url(quality: String, preferred: String): Url
+}
+
+`;
+
 exports[`extend.graphql 1`] = `
 extend type Feedback {
   custom_int: Int

tests/graphql_object_type_def/arguments.graphql

@@ -0,0 +1,3 @@
+type Video {
+  playable_url(quality: String, preferred: String): Url
+}