Correctly place trailing comments in conditionals (#754)

Previously we would blindly put leading comments of the next expression, but we didn't account for a real trailing comment. By checking if the leadingNode is on the same line, we can correctly put it there when needed

Fixes #685

src/comments.js

@@ -161,8 +161,10 @@ function attach(comments, ast, text) {
       if (
         handleConditionalExpressionComments(
           enclosingNode,
+          precedingNode,
           followingNode,
-          comment
+          comment,
+          text
         )
       ) {
         // We're good
@@ -382,10 +384,16 @@ function handleMemberExpressionComment(enclosingNode, followingNode, comment) {
 
 function handleConditionalExpressionComments(
   enclosingNode,
+  precedingNode,
   followingNode,
-  comment
+  comment,
+  text
 ) {
+  const isSameLineAsPrecedingNode = precedingNode &&
+    !util.hasNewlineInRange(text, locEnd(precedingNode), locStart(comment));
+
   if (
+    (!precedingNode || !isSameLineAsPrecedingNode) &&
     enclosingNode &&
     enclosingNode.type === "ConditionalExpression" &&
     followingNode

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

@@ -32,6 +32,10 @@ const extractTextPluginOptions = shouldUseRelativeAssetPaths
 const extractTextPluginOptions = shouldUseRelativeAssetPaths // Making sure that the publicPath goes back to to build folder.
   ? { publicPath: Array(cssFilename.split(\"/\").length).join(\"../\") }
   : {};
+
+const { configureStore } = process.env.NODE_ENV === \"production\"
+  ? require(\"./configureProdStore\") // a
+  : require(\"./configureDevStore\"); // b
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var inspect = 4 === util.inspect.length
   ? // node <= 0.8.x
@@ -63,9 +67,12 @@ const extractTextPluginOptions = shouldUseRelativeAssetPaths
     { publicPath: Array(cssFilename.split(\"/\").length).join(\"../\") }
   : {};
 
-const extractTextPluginOptions = shouldUseRelativeAssetPaths
-  ? // Making sure that the publicPath goes back to to build folder.
-    { publicPath: Array(cssFilename.split(\"/\").length).join(\"../\") }
+const extractTextPluginOptions = shouldUseRelativeAssetPaths // Making sure that the publicPath goes back to to build folder.
+  ? { publicPath: Array(cssFilename.split(\"/\").length).join(\"../\") }
   : {};
+
+const { configureStore } = process.env.NODE_ENV === \"production\"
+  ? require(\"./configureProdStore\") // a
+  : require(\"./configureDevStore\"); // b
 "
 `;

tests/conditional/comments.js

@@ -31,3 +31,7 @@ const extractTextPluginOptions = shouldUseRelativeAssetPaths
 const extractTextPluginOptions = shouldUseRelativeAssetPaths // Making sure that the publicPath goes back to to build folder.
   ? { publicPath: Array(cssFilename.split("/").length).join("../") }
   : {};
+
+const { configureStore } = process.env.NODE_ENV === "production"
+  ? require("./configureProdStore") // a
+  : require("./configureDevStore"); // b