Don't add new lines after unless present in graphql (#4512)

* Don't add new lines after unless present in graphql

* fix logic and add more specs

* use index

src/language-graphql/printer-graphql.js

@@ -24,10 +24,22 @@ function genericPrint(path, options, print) {
 
   switch (n.kind) {
     case "Document": {
-      return concat([
-        join(concat([hardline, hardline]), path.map(print, "definitions")),
-        hardline
-      ]);
+      const parts = [];
+      path.map((pathChild, index) => {
+        parts.push(concat([pathChild.call(print)]));
+        parts.push(hardline);
+        if (
+          index !== n.definitions.length - 1 &&
+          sharedUtil.isNextLineEmpty(
+            options.originalText,
+            pathChild.getValue(),
+            options
+          )
+        ) {
+          parts.push(hardline);
+        }
+      }, "definitions");
+      return concat(parts, hardline);
     }
     case "OperationDefinition": {
       const hasOperation = options.originalText[options.locStart(n)] !== "{";

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

@@ -7,17 +7,28 @@ directive @a(as: String = 1) on QUERY
 directive @a(as: String, b: Int!) on QUERY
 directive @a(as: String! = 1 @deprecated) on QUERY
 directive @a(as: String! = 1 @deprecated) on QUERY | MUTATION
+
+directive @a on QUERY
+
+
+directive @a(as: String) on QUERY
+
+
+
+
+directive @a(as: String = 1) on QUERY
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+directive @a on QUERY
+directive @a(as: String) on QUERY
+directive @a(as: String = 1) on QUERY
+directive @a(as: String, b: Int!) on QUERY
+directive @a(as: String! = 1 @deprecated) on QUERY
+directive @a(as: String! = 1 @deprecated) on QUERY | MUTATION
+
 directive @a on QUERY
 
 directive @a(as: String) on QUERY
 
 directive @a(as: String = 1) on QUERY
 
-directive @a(as: String, b: Int!) on QUERY
-
-directive @a(as: String! = 1 @deprecated) on QUERY
-
-directive @a(as: String! = 1 @deprecated) on QUERY | MUTATION
-
 `;

tests/graphql_directive_decl/directive_decl.graphql

@@ -4,3 +4,13 @@ directive @a(as: String = 1) on QUERY
 directive @a(as: String, b: Int!) on QUERY
 directive @a(as: String! = 1 @deprecated) on QUERY
 directive @a(as: String! = 1 @deprecated) on QUERY | MUTATION
+
+directive @a on QUERY
+
+
+directive @a(as: String) on QUERY
+
+
+
+
+directive @a(as: String = 1) on QUERY