From ada0bb9f67305d058a2e8f6d42dbc46795b401e2 Mon Sep 17 00:00:00 2001
From: Luke Scott <luke@webconnex.com>
Date: Fri, 24 Apr 2015 09:18:32 -0700
Subject: [PATCH] Inject strict/es6.tailCall into helper transform blacklist

---
 index.js     | 28 ++++++++++++++++++++++------
 package.json |  2 +-
 2 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/index.js b/index.js
index c8c136b..5b3e296 100644
--- a/index.js
+++ b/index.js
@@ -2,7 +2,8 @@ var babelc = require('babel-core');
 var resolveRc = require('babel-core/lib/babel/tools/resolve-rc')
 var sander = require('sander');
 var mapSeries = require('promise-map-series');
-var objectAssign = require('object-assign');
+var assign = require('lodash/object/assign');
+var merge = require('lodash/object/merge');
 var path = require('path');
 
 module.exports = babel;
@@ -24,7 +25,7 @@ function babel(inputdir, outputdir, opts) {
 					var hf = slashes(filename) + '__babelHelpers.js';
 					code = 'import {babelHelpers} from "' + hf + '";\n' + code;
 				}
-				var result = babelc.transform(code, objectAssign({}, opts, {
+				var result = babelc.transform(code, assign({}, opts, {
 					filename: inputdir + '/' + filename
 				}));
 				if (importHelpers) {
@@ -52,17 +53,32 @@ function slashes(from) {
 
 function buildHelpers(usedHelpers, opts) {
 	var helpers1 = babelc.buildExternalHelpers(usedHelpers, "var");
+	opts = merge({}, opts, {
+		externalHelpers: true,
+		metadataUsedHelpers: true,
+		blacklist: ["strict", "es6.tailCall"]
+	}, mergeCustom);
 	addUniqueHelpers(usedHelpers,
-		babelc.transform(helpers1, objectAssign({}, opts, {
-			externalHelpers: true,
-			metadataUsedHelpers: true
-		})).metadata.usedHelpers
+		babelc.transform(helpers1, opts).metadata.usedHelpers
 	);
 	delete opts.metadataUsedHelpers;
 	var helpers2 = babelc.buildExternalHelpers(usedHelpers, "var");
 	return "export " + babelc.transform(helpers2, opts).code;
 }
 
+function mergeCustom(a, b) {
+	if (Array.isArray(a)) {
+		var c = a.slice(0);
+		for (var i = b.length - 1; b >= 0; i++) {
+			var v = b[i];
+			if (a.indexOf(v) < 0) {
+				c.push(v);
+			}
+		}
+		return c;
+	}
+}
+
 function addUniqueHelpers(dest, src) {
 	for (var i = src.length - 1; i >= 0; i--) {
 		if (dest.indexOf(src[i]) < 0) {
diff --git a/package.json b/package.json
index dbf6a6e..dfbfce9 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "repository": "https://github.com/babel/gobble-babel",
   "dependencies": {
     "babel-core": "^5.0.0",
-    "object-assign": "^2.0.0",
+    "lodash": "^3.7.0",
     "promise-map-series": "^0.2.1",
     "sander": "^0.2.3"
   },