v2.12.2

CHANGELOG.md

@@ -11,6 +11,11 @@
 
 _Note: Gaps between patch versions are faulty/broken releases._
 
+## 2.12.2
+
+ * **Internal**
+  * Exclude nodes in function parameters and catch clauses from `isReferenced` check.
+
 ## 2.12.1
 
  * **Internal**

lib/6to5/transformation/transformers/es6-default-parameters.js

@@ -45,7 +45,7 @@ exports.Function = function (node, parent, file, scope) {
     }
 
     // we're accessing a variable that's already defined within this function
-    var has = scope.get(param.name);
+    var has = scope.get(param.name, true);
     if (has && node.params.indexOf(has) < 0) {
       iife = true;
     }

lib/6to5/types/index.js

@@ -193,6 +193,17 @@ t.isReferenced = function (node, parent) {
   // we're a property key and we aren't computed so we aren't referenced
   if (t.isProperty(parent) && parent.key === node && !parent.computed) return false;
 
+  if (t.isFunction(parent)) {
+    // we're a function param
+    if (_.contains(parent.params, node)) return false;
+
+    // we're a rest parameter
+    if (_.contains(parent.params, node)) return false;
+  }
+
+  // we're a catch clause param
+  if (t.isCatchClause(parent) && parent.param === node) return false;
+
   // we're a variable declarator id so we aren't referenced
   if (t.isVariableDeclarator(parent) && parent.id === node) return false;
 

package.json

@@ -1,7 +1,7 @@
 {
   "name": "6to5",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "2.12.1",
+  "version": "2.12.2",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://github.com/6to5/6to5",
   "repository": {