fix up whitespace on non empty last line JSX literals - fixes #668

lib/6to5/transformation/transformers/other/react.js

@@ -171,11 +171,21 @@ exports.JSXElement = {
 var cleanJSXElementLiteralChild = function (child, args) {
   var lines = child.value.split(/\r\n|\n|\r/);
 
-  for (var i = 0; i < lines.length; i++) {
+  var lastNonEmptyLine = 0;
+  var i;
+
+  for (i = 0; i < lines.length; i++) {
+    if (lines[i].match(/[^ \t]/)) {
+      lastNonEmptyLine = i;
+    }
+  }
+
+  for (i = 0; i < lines.length; i++) {
     var line = lines[i];
 
     var isFirstLine = i === 0;
     var isLastLine = i === lines.length - 1;
+    var isLastNonEmptyLine = i === lastNonEmptyLine;
 
     // replace rendered whitespace tabs with spaces
     var trimmedLine = line.replace(/\t/g, " ");
@@ -191,6 +201,10 @@ var cleanJSXElementLiteralChild = function (child, args) {
     }
 
     if (trimmedLine) {
+      if (!isLastNonEmptyLine) {
+        trimmedLine += " ";
+      }
+
       args.push(t.literal(trimmedLine));
     }
   }