GraphQL: Implement scalar (#2313)

src/printer-graphql.js

@@ -365,6 +365,14 @@ function genericPrint(path, options, print) {
       );
     }
 
+    case "ScalarTypeDefinition": {
+      return concat([
+        "scalar ",
+        path.call(print, "name"),
+        printDirectives(path, print, n)
+      ]);
+    }
+
     case "NonNullType": {
       return concat([path.call(print, "type"), "!"]);
     }

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

@@ -0,0 +1,8 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`scalar.graphql 1`] = `
+scalar Color @deprecated
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+scalar Color @deprecated
+
+`;

tests/graphql_scalar/jsfmt.spec.js

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

tests/graphql_scalar/scalar.graphql

@@ -0,0 +1 @@
+scalar Color @deprecated