GraphQL: Print directives for field declarations (#2317)

src/printer-graphql.js

@@ -254,7 +254,8 @@ function genericPrint(path, options, print) {
             )
           : "",
         ": ",
-        path.call(print, "type")
+        path.call(print, "type"),
+        printDirectives(path, print, n)
       ]);
     }
 

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

@@ -11,6 +11,17 @@ type Video {
 
 `;
 
+exports[`directives.graphql 1`] = `
+type PokemonType {
+  pokemon_type: String @mock(value: "Electric")
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+type PokemonType {
+  pokemon_type: String @mock(value: "Electric")
+}
+
+`;
+
 exports[`extend.graphql 1`] = `
 extend type Feedback {
   custom_int: Int

tests/graphql_object_type_def/directives.graphql

@@ -0,0 +1,3 @@
+type PokemonType {
+  pokemon_type: String @mock(value: "Electric")
+}