GraphQL: Implement Enum (#2310)

src/printer-graphql.js

@@ -217,12 +217,12 @@ function genericPrint(path, options, print) {
       return concat([
         "type ",
         path.call(print, "name"),
-        n.interfaces && n.interfaces.length > 0
+        n.interfaces.length > 0
           ? concat([" implements ", join(", ", path.map(print, "interfaces"))])
           : "",
         printDirectives(path, print, n),
         " {",
-        n.fields && n.fields.length > 0
+        n.fields.length > 0
           ? indent(
               concat([hardline, join(hardline, path.map(print, "fields"))])
             )
@@ -263,6 +263,29 @@ function genericPrint(path, options, print) {
       ]);
     }
 
+    case "EnumTypeDefinition": {
+      return concat([
+        "enum ",
+        path.call(print, "name"),
+        printDirectives(path, print, n),
+        " {",
+        n.values.length > 0
+          ? indent(
+              concat([hardline, join(hardline, path.map(print, "values"))])
+            )
+          : "",
+        hardline,
+        "}"
+      ]);
+    }
+
+    case "EnumValueDefinition": {
+      return concat([
+        path.call(print, "name"),
+        printDirectives(path, print, n)
+      ]);
+    }
+
     case "InputValueDefinition": {
       return concat([
         path.call(print, "name"),

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

@@ -0,0 +1,16 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`enum.graphql 1`] = `
+enum State {
+  PENDING
+  VISIBLE
+  ARCHIVED
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+enum State {
+  PENDING
+  VISIBLE
+  ARCHIVED
+}
+
+`;

tests/graphql_enum/enum.graphql

@@ -0,0 +1,5 @@
+enum State {
+  PENDING
+  VISIBLE
+  ARCHIVED
+}

tests/graphql_enum/jsfmt.spec.js

@@ -0,0 +1 @@
+run_spec(__dirname, { parser: "graphql" });