fix(multiparser): no additional trailing newline for graphql in js (#4616)

Fixes #4615

The root cause is the output doc from graphql printer does not match the desired input from `stripTrailingHardline`.

a9b21a01e2/src/doc/doc-utils.js (L167-L180)

src/language-graphql/printer-graphql.js

@@ -28,15 +28,16 @@ function genericPrint(path, options, print) {
       const parts = [];
       path.map((pathChild, index) => {
         parts.push(concat([pathChild.call(print)]));
-        parts.push(hardline);
-        if (
-          index !== n.definitions.length - 1 &&
-          isNextLineEmpty(options.originalText, pathChild.getValue(), options)
-        ) {
+        if (index !== n.definitions.length - 1) {
           parts.push(hardline);
+          if (
+            isNextLineEmpty(options.originalText, pathChild.getValue(), options)
+          ) {
+            parts.push(hardline);
+          }
         }
       }, "definitions");
-      return concat(parts, hardline);
+      return concat([concat(parts), hardline]);
     }
     case "OperationDefinition": {
       const hasOperation = options.originalText[options.locStart(n)] !== "{";

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

@@ -40,6 +40,29 @@ const query = /* GraphQL */ \`
 
 `;
 
+exports[`definitions.js 1`] = `
+graphql\`
+  fragment x on y {
+    z
+  }
+
+  fragment a on b {
+    c
+  }
+\`;
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+graphql\`
+  fragment x on y {
+    z
+  }
+
+  fragment a on b {
+    c
+  }
+\`;
+
+`;
+
 exports[`expressions.js 1`] = `
 graphql(schema, \`
 query allPartsByManufacturerName($name: String!) {

tests/multiparser_js_graphql/definitions.js

@@ -0,0 +1,9 @@
+graphql`
+  fragment x on y {
+    z
+  }
+
+  fragment a on b {
+    c
+  }
+`;