Support graphql NonNullType (#2060)

src/printer-graphql.js

@@ -243,6 +243,13 @@ function genericPrint(path, options, print) {
       );
     }
 
+    case "NonNullType": {
+      return concat([
+        path.call(print, "type"),
+        "!"
+      ]);
+    }
+
     default:
       throw new Error("unknown graphql type: " + JSON.stringify(n.kind));
   }

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

@@ -1,16 +1,17 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`variable_definitions.graphql 1`] = `
-query short($foo:ComplexType, $site   : Site =         MOBILE) {
+query short($foo:ComplexType, $site   : Site =         MOBILE,     $nonNull: Int!) {
   hello
 }
 
 query long($foo: ComplexType, $site: Float = 124241.12312,
-$bar: String = "Long string here", $arg: String = "Hello world!",,,,) {
+$bar: String = "Long string here", $arg: String = "Hello world!",,,,,
+$nonNull: String!) {
   hello
 }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-query short($foo: ComplexType, $site: Site = MOBILE) {
+query short($foo: ComplexType, $site: Site = MOBILE, $nonNull: Int!) {
   hello
 }
 
@@ -18,7 +19,8 @@ query long(
   $foo: ComplexType,
   $site: Float = 124241.12312,
   $bar: String = "Long string here",
-  $arg: String = "Hello world!"
+  $arg: String = "Hello world!",
+  $nonNull: String!
 ) {
   hello
 }

tests/graphql_variable_definitions/variable_definitions.graphql

@@ -1,8 +1,9 @@
-query short($foo:ComplexType, $site   : Site =         MOBILE) {
+query short($foo:ComplexType, $site   : Site =         MOBILE,     $nonNull: Int!) {
   hello
 }
 
 query long($foo: ComplexType, $site: Float = 124241.12312,
-$bar: String = "Long string here", $arg: String = "Hello world!",,,,) {
+$bar: String = "Long string here", $arg: String = "Hello world!",,,,,
+$nonNull: String!) {
   hello
 }