fix bug where templates were getting polluted with old traversal paths

src/babel/transformation/file/index.js

@@ -481,7 +481,7 @@ export default class File {
   }
 
   _addAst(ast) {
-    this.path  = NodePath.get({
+    this.path = NodePath.get({
       hub: this.hub,
       parentPath: null,
       parent: ast,

src/babel/traversal/index.js

@@ -49,7 +49,7 @@ const CLEAR_KEYS = [
   "tokens", "range", "start", "end", "loc", "raw"
 ];
 
-function clearNode(node) {
+traverse.clearNode = function (node) {
   for (var i = 0; i < CLEAR_KEYS.length; i++) {
     let key = CLEAR_KEYS[i];
     if (node[key] != null) node[key] = null;
@@ -58,12 +58,12 @@ function clearNode(node) {
 
 var clearVisitor = {
   noScope: true,
-  exit: clearNode
+  exit: traverse.clearNode
 };
 
 traverse.removeProperties = function (tree) {
   traverse(tree, clearVisitor);
-  clearNode(tree);
+  traverse.clearNode(tree);
 
   return tree;
 };

src/babel/util.js

@@ -127,6 +127,7 @@ export function shouldIgnore(filename, ignore, only) {
 
 var templateVisitor = {
   noScope: true,
+
   enter(node, parent, scope, nodes) {
     if (t.isExpressionStatement(node)) {
       node = node.expression;
@@ -136,6 +137,10 @@ var templateVisitor = {
       this.skip();
       this.replaceInline(nodes[node.name]);
     }
+  },
+
+  exit(node) {
+    traverse.clearNode(node);
   }
 };