From f2981b7e95c50296790b909818a45cfe5efd1562 Mon Sep 17 00:00:00 2001
From: Ondrej Kraus <neverberlerfellerer@gmail.com>
Date: Wed, 25 Feb 2015 03:02:48 +0100
Subject: [PATCH] replace direct node type checking with helper functions

---
 .../transformers/es6/parameters.rest.js       | 20 ++++++-------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/src/babel/transformation/transformers/es6/parameters.rest.js b/src/babel/transformation/transformers/es6/parameters.rest.js
index 2c2937bf2c..12be9d2bd3 100644
--- a/src/babel/transformation/transformers/es6/parameters.rest.js
+++ b/src/babel/transformation/transformers/es6/parameters.rest.js
@@ -16,11 +16,11 @@ var memberExpressionVisitor = {
 
     if (!t.isReferencedIdentifier(node, parent, { name: state.name })) return;
 
-    if (parent.type === 'MemberExpression') {
+    if (t.isMemberExpression(parent)) {
       var prop = parent.property;
       if (typeof prop.value === 'number' ||
-          prop.type === 'UnaryExpression' ||
-          prop.type === 'BinaryExpression') {
+          t.isUnaryExpression(prop) ||
+          t.isBinaryExpression(prop)) {
         state.candidates.push({ node: node, parent: parent });
         return;
       }
@@ -35,26 +35,18 @@ function optimizeMemberExpression(node, parent, offset) {
   var newExpr;
 
   var prop = parent.property;
-  switch (prop.type) {
-  case 'Literal':
+  if (t.isLiteral(prop)) {
     node.name = 'arguments';
     prop.value += offset;
     prop.raw = String(prop.value);
-    break;
-  case 'UnaryExpression': {
+  } else if (t.isUnaryExpression(prop)) {
     node.name = 'arguments';
     newExpr = t.binaryExpression('+', prop, t.literal(offset));
     parent.property = newExpr;
-    break;
-  }
-  case 'BinaryExpression': {
+  } else if (t.isBinaryExpression(prop)) {
     node.name = 'arguments';
     newExpr = t.binaryExpression('+', prop, t.literal(offset));
     parent.property = newExpr;
-    break;
-  }
-  default:
-    throw new Error('Unsupported property type');
   }
 }