From f657598c72f5296895d2282b6bb4bd36713a7d42 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Sat, 9 May 2015 16:52:57 +0100
Subject: [PATCH] remove noop traversal visitors methods

---
 src/babel/traversal/path/index.js | 9 ++++-----
 src/babel/traversal/visitors.js   | 4 ----
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/src/babel/traversal/path/index.js b/src/babel/traversal/path/index.js
index a70575bee4..8ddff8c401 100644
--- a/src/babel/traversal/path/index.js
+++ b/src/babel/traversal/path/index.js
@@ -745,11 +745,10 @@ export default class TraversalPath {
     if (!node) return;
 
     var opts = this.opts;
-    var fns  = [].concat(opts[key]);
+    if (!opts[key] && !opts[node.type]) return;
 
-    if (opts[node.type]) {
-      fns = fns.concat(opts[node.type][key]);
-    }
+    var fns = [].concat(opts[key]);
+    if (opts[node.type]) fns = fns.concat(opts[node.type][key]);
 
     for (var fn of (fns: Array)) {
       if (!fn) continue;
@@ -789,7 +788,7 @@ export default class TraversalPath {
 
   visit(): boolean {
     if (this.isBlacklisted()) return false;
-    if (this.opts.shouldSkip(this)) return false;
+    if (this.opts.shouldSkip && this.opts.shouldSkip(this)) return false;
 
     this.call("enter");
 
diff --git a/src/babel/traversal/visitors.js b/src/babel/traversal/visitors.js
index 3d99110546..55bd53d5d2 100644
--- a/src/babel/traversal/visitors.js
+++ b/src/babel/traversal/visitors.js
@@ -82,10 +82,6 @@ export function verify(visitor) {
     throw new Error(messages.get("traverseVerifyRootFunction"));
   }
 
-  if (!visitor.enter) visitor.enter = function () { };
-  if (!visitor.exit) visitor.exit = function () { };
-  if (!visitor.shouldSkip) visitor.shouldSkip = function () { return false; };
-
   for (var nodeType in visitor) {
     if (shouldIgnoreKey(nodeType)) continue;