diff --git a/.babelrc b/.babelrc
index 82024762c5..f3b952604a 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,5 +1,6 @@
 {
   "experimental": true,
   "playground": true,
-  "loose": true
+  "loose": true,
+  "blacklist": ["es6.tailCall"]
 }
diff --git a/.gitignore b/.gitignore
index ab255e6959..bd8b1c1bce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@ dist
 .package.json
 packages/babel-runtime/*.js
 packages/babel-runtime/regenerator/*.js
+lib
diff --git a/.jscsrc b/.jscsrc
index 92ceeea268..f62d0c74eb 100644
--- a/.jscsrc
+++ b/.jscsrc
@@ -1,5 +1,5 @@
 {
-  "excludeFiles": ["lib/babel/transformation/templates"],
+  "excludeFiles": ["src/babel/transformation/templates"],
   "disallowSpacesInNamedFunctionExpression": {
     "beforeOpeningRoundBrace": true
   },
diff --git a/.jshintignore b/.jshintignore
index 60c0292be4..2bf824307c 100644
--- a/.jshintignore
+++ b/.jshintignore
@@ -1 +1 @@
-lib/babel/transformation/templates
+src/babel/transformation/templates
diff --git a/.npmignore b/.npmignore
index 5e135bc1d1..68d01756df 100644
--- a/.npmignore
+++ b/.npmignore
@@ -13,3 +13,4 @@ CHANGELOG.md
 coverage
 vendor
 packages
+src
diff --git a/Makefile b/Makefile
index 95a395e165..6c3723a52e 100644
--- a/Makefile
+++ b/Makefile
@@ -12,13 +12,14 @@ export NODE_ENV = test
 .PHONY: clean test test-cov test-clean lint test-travis test-simple test-all test-browser publish build bootstrap publish-core publish-runtime build-core watch-core
 
 build-core:
-	#node $(BABEL_CMD) src --out-dir lib
+	node $(BABEL_CMD) src --out-dir lib --copy-files
 
 watch-core:
-	#node $(BABEL_CMD) src --out-dir lib --watch
+	node $(BABEL_CMD) src --out-dir lib --watch --copy-files
 
 build:
 	mkdir -p dist
+	make build-core
 
 	node tools/cache-templates
 
@@ -37,8 +38,8 @@ clean:
 	rm -rf coverage templates.json test/tmp dist
 
 lint:
-	$(JSHINT_CMD) --reporter node_modules/jshint-stylish/stylish.js lib bin
-	$(JSCS_CMD) lib bin
+	$(JSHINT_CMD) --reporter node_modules/jshint-stylish/stylish.js src bin
+	$(JSCS_CMD) src bin
 
 test-clean:
 	rm -rf test/tmp
diff --git a/bin/babel/dir.js b/bin/babel/dir.js
index 14ca05df3b..eb6cb7f3a5 100644
--- a/bin/babel/dir.js
+++ b/bin/babel/dir.js
@@ -64,7 +64,7 @@ module.exports = function (commander, filenames, opts) {
       _.each(["add", "change"], function (type) {
         watcher.on(type, function (filename) {
           var relative = path.relative(dirname, filename) || filename;
-          write(filename, relative);
+          if (util.canCompile(filename)) write(filename, relative);
         });
       });
     });
diff --git a/bin/babel/util.js b/bin/babel/util.js
index 24afd62a12..99255b9f63 100644
--- a/bin/babel/util.js
+++ b/bin/babel/util.js
@@ -24,6 +24,7 @@ exports.addSourceMappingUrl = function (code, loc) {
 exports.transform = function (filename, code, opts) {
   opts = _.defaults(opts || {}, index.opts);
   opts.filename = filename;
+  resolveRc(filename, opts);
 
   var result;
   try {
@@ -42,7 +43,6 @@ exports.transform = function (filename, code, opts) {
 };
 
 exports.compile = function (filename, opts) {
-  resolveRc(filename, opts);
   var code = fs.readFileSync(filename, "utf8");
   return exports.transform(filename, code, opts);
 };
diff --git a/lib/babel/transformation/templates/.babelrc b/lib/babel/transformation/templates/.babelrc
deleted file mode 100644
index a5a58b5836..0000000000
--- a/lib/babel/transformation/templates/.babelrc
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "blacklist": ["useStrict"]
-}
diff --git a/package.json b/package.json
index 36b80c4ee9..8e35b3dfbf 100644
--- a/package.json
+++ b/package.json
@@ -67,6 +67,7 @@
     "trim-right": "^1.0.0"
   },
   "devDependencies": {
+    "babel": "4.5.0",
     "browserify": "^8.1.3",
     "chai": "^2.0.0",
     "esvalid": "^1.1.0",
diff --git a/lib/babel/api/browser.js b/src/babel/api/browser.js
similarity index 100%
rename from lib/babel/api/browser.js
rename to src/babel/api/browser.js
diff --git a/lib/babel/api/node.js b/src/babel/api/node.js
similarity index 100%
rename from lib/babel/api/node.js
rename to src/babel/api/node.js
diff --git a/lib/babel/api/register/browser.js b/src/babel/api/register/browser.js
similarity index 100%
rename from lib/babel/api/register/browser.js
rename to src/babel/api/register/browser.js
diff --git a/lib/babel/api/register/cache.js b/src/babel/api/register/cache.js
similarity index 100%
rename from lib/babel/api/register/cache.js
rename to src/babel/api/register/cache.js
diff --git a/lib/babel/api/register/node.js b/src/babel/api/register/node.js
similarity index 100%
rename from lib/babel/api/register/node.js
rename to src/babel/api/register/node.js
diff --git a/lib/babel/api/register/resolve-rc.js b/src/babel/api/register/resolve-rc.js
similarity index 83%
rename from lib/babel/api/register/resolve-rc.js
rename to src/babel/api/register/resolve-rc.js
index 1e82938aea..20d5f9d5eb 100644
--- a/lib/babel/api/register/resolve-rc.js
+++ b/src/babel/api/register/resolve-rc.js
@@ -30,7 +30,12 @@ module.exports = function (loc, opts) {
         throw err;
       }
 
-      opts = merge(json, opts);
+      if (json.breakConfig) return;
+      merge(opts, json, function(a, b) {
+        if (Array.isArray(a)) {
+          return a.concat(b);
+        }
+      });
     }
 
     var up = path.dirname(start);
diff --git a/lib/babel/build-external-helpers.js b/src/babel/build-external-helpers.js
similarity index 100%
rename from lib/babel/build-external-helpers.js
rename to src/babel/build-external-helpers.js
diff --git a/lib/babel/build-helpers.js b/src/babel/build-helpers.js
similarity index 100%
rename from lib/babel/build-helpers.js
rename to src/babel/build-helpers.js
diff --git a/lib/babel/detection/index.js b/src/babel/detection/index.js
similarity index 100%
rename from lib/babel/detection/index.js
rename to src/babel/detection/index.js
diff --git a/lib/babel/detection/syntax-keys.json b/src/babel/detection/syntax-keys.json
similarity index 100%
rename from lib/babel/detection/syntax-keys.json
rename to src/babel/detection/syntax-keys.json
diff --git a/lib/babel/detection/visitors.js b/src/babel/detection/visitors.js
similarity index 100%
rename from lib/babel/detection/visitors.js
rename to src/babel/detection/visitors.js
diff --git a/lib/babel/generation/buffer.js b/src/babel/generation/buffer.js
similarity index 100%
rename from lib/babel/generation/buffer.js
rename to src/babel/generation/buffer.js
diff --git a/lib/babel/generation/generators/base.js b/src/babel/generation/generators/base.js
similarity index 100%
rename from lib/babel/generation/generators/base.js
rename to src/babel/generation/generators/base.js
diff --git a/lib/babel/generation/generators/classes.js b/src/babel/generation/generators/classes.js
similarity index 100%
rename from lib/babel/generation/generators/classes.js
rename to src/babel/generation/generators/classes.js
diff --git a/lib/babel/generation/generators/comprehensions.js b/src/babel/generation/generators/comprehensions.js
similarity index 100%
rename from lib/babel/generation/generators/comprehensions.js
rename to src/babel/generation/generators/comprehensions.js
diff --git a/lib/babel/generation/generators/expressions.js b/src/babel/generation/generators/expressions.js
similarity index 100%
rename from lib/babel/generation/generators/expressions.js
rename to src/babel/generation/generators/expressions.js
diff --git a/lib/babel/generation/generators/flow.js b/src/babel/generation/generators/flow.js
similarity index 100%
rename from lib/babel/generation/generators/flow.js
rename to src/babel/generation/generators/flow.js
diff --git a/lib/babel/generation/generators/jsx.js b/src/babel/generation/generators/jsx.js
similarity index 100%
rename from lib/babel/generation/generators/jsx.js
rename to src/babel/generation/generators/jsx.js
diff --git a/lib/babel/generation/generators/methods.js b/src/babel/generation/generators/methods.js
similarity index 100%
rename from lib/babel/generation/generators/methods.js
rename to src/babel/generation/generators/methods.js
diff --git a/lib/babel/generation/generators/modules.js b/src/babel/generation/generators/modules.js
similarity index 100%
rename from lib/babel/generation/generators/modules.js
rename to src/babel/generation/generators/modules.js
diff --git a/lib/babel/generation/generators/playground.js b/src/babel/generation/generators/playground.js
similarity index 100%
rename from lib/babel/generation/generators/playground.js
rename to src/babel/generation/generators/playground.js
diff --git a/lib/babel/generation/generators/statements.js b/src/babel/generation/generators/statements.js
similarity index 100%
rename from lib/babel/generation/generators/statements.js
rename to src/babel/generation/generators/statements.js
diff --git a/lib/babel/generation/generators/template-literals.js b/src/babel/generation/generators/template-literals.js
similarity index 100%
rename from lib/babel/generation/generators/template-literals.js
rename to src/babel/generation/generators/template-literals.js
diff --git a/lib/babel/generation/generators/types.js b/src/babel/generation/generators/types.js
similarity index 100%
rename from lib/babel/generation/generators/types.js
rename to src/babel/generation/generators/types.js
diff --git a/lib/babel/generation/index.js b/src/babel/generation/index.js
similarity index 100%
rename from lib/babel/generation/index.js
rename to src/babel/generation/index.js
diff --git a/lib/babel/generation/node/index.js b/src/babel/generation/node/index.js
similarity index 100%
rename from lib/babel/generation/node/index.js
rename to src/babel/generation/node/index.js
diff --git a/lib/babel/generation/node/parentheses.js b/src/babel/generation/node/parentheses.js
similarity index 100%
rename from lib/babel/generation/node/parentheses.js
rename to src/babel/generation/node/parentheses.js
diff --git a/lib/babel/generation/node/whitespace.js b/src/babel/generation/node/whitespace.js
similarity index 100%
rename from lib/babel/generation/node/whitespace.js
rename to src/babel/generation/node/whitespace.js
diff --git a/lib/babel/generation/position.js b/src/babel/generation/position.js
similarity index 100%
rename from lib/babel/generation/position.js
rename to src/babel/generation/position.js
diff --git a/lib/babel/generation/source-map.js b/src/babel/generation/source-map.js
similarity index 100%
rename from lib/babel/generation/source-map.js
rename to src/babel/generation/source-map.js
diff --git a/lib/babel/generation/whitespace.js b/src/babel/generation/whitespace.js
similarity index 100%
rename from lib/babel/generation/whitespace.js
rename to src/babel/generation/whitespace.js
diff --git a/lib/babel/helpers/code-frame.js b/src/babel/helpers/code-frame.js
similarity index 100%
rename from lib/babel/helpers/code-frame.js
rename to src/babel/helpers/code-frame.js
diff --git a/lib/babel/helpers/normalize-ast.js b/src/babel/helpers/normalize-ast.js
similarity index 100%
rename from lib/babel/helpers/normalize-ast.js
rename to src/babel/helpers/normalize-ast.js
diff --git a/lib/babel/helpers/object.js b/src/babel/helpers/object.js
similarity index 100%
rename from lib/babel/helpers/object.js
rename to src/babel/helpers/object.js
diff --git a/lib/babel/helpers/parse.js b/src/babel/helpers/parse.js
similarity index 100%
rename from lib/babel/helpers/parse.js
rename to src/babel/helpers/parse.js
diff --git a/lib/babel/helpers/to-fast-properties.js b/src/babel/helpers/to-fast-properties.js
similarity index 100%
rename from lib/babel/helpers/to-fast-properties.js
rename to src/babel/helpers/to-fast-properties.js
diff --git a/lib/babel/messages.js b/src/babel/messages.js
similarity index 100%
rename from lib/babel/messages.js
rename to src/babel/messages.js
diff --git a/lib/babel/patch.js b/src/babel/patch.js
similarity index 100%
rename from lib/babel/patch.js
rename to src/babel/patch.js
diff --git a/lib/babel/polyfill.js b/src/babel/polyfill.js
similarity index 100%
rename from lib/babel/polyfill.js
rename to src/babel/polyfill.js
diff --git a/lib/babel/transformation/file.js b/src/babel/transformation/file.js
similarity index 100%
rename from lib/babel/transformation/file.js
rename to src/babel/transformation/file.js
diff --git a/lib/babel/transformation/helpers/build-binary-assignment-operator-transformer.js b/src/babel/transformation/helpers/build-binary-assignment-operator-transformer.js
similarity index 100%
rename from lib/babel/transformation/helpers/build-binary-assignment-operator-transformer.js
rename to src/babel/transformation/helpers/build-binary-assignment-operator-transformer.js
diff --git a/lib/babel/transformation/helpers/build-comprehension.js b/src/babel/transformation/helpers/build-comprehension.js
similarity index 100%
rename from lib/babel/transformation/helpers/build-comprehension.js
rename to src/babel/transformation/helpers/build-comprehension.js
diff --git a/lib/babel/transformation/helpers/build-conditional-assignment-operator-transformer.js b/src/babel/transformation/helpers/build-conditional-assignment-operator-transformer.js
similarity index 100%
rename from lib/babel/transformation/helpers/build-conditional-assignment-operator-transformer.js
rename to src/babel/transformation/helpers/build-conditional-assignment-operator-transformer.js
diff --git a/lib/babel/transformation/helpers/build-react-transformer.js b/src/babel/transformation/helpers/build-react-transformer.js
similarity index 100%
rename from lib/babel/transformation/helpers/build-react-transformer.js
rename to src/babel/transformation/helpers/build-react-transformer.js
diff --git a/lib/babel/transformation/helpers/define-map.js b/src/babel/transformation/helpers/define-map.js
similarity index 100%
rename from lib/babel/transformation/helpers/define-map.js
rename to src/babel/transformation/helpers/define-map.js
diff --git a/lib/babel/transformation/helpers/explode-assignable-expression.js b/src/babel/transformation/helpers/explode-assignable-expression.js
similarity index 100%
rename from lib/babel/transformation/helpers/explode-assignable-expression.js
rename to src/babel/transformation/helpers/explode-assignable-expression.js
diff --git a/lib/babel/transformation/helpers/name-method.js b/src/babel/transformation/helpers/name-method.js
similarity index 100%
rename from lib/babel/transformation/helpers/name-method.js
rename to src/babel/transformation/helpers/name-method.js
diff --git a/lib/babel/transformation/helpers/react.js b/src/babel/transformation/helpers/react.js
similarity index 100%
rename from lib/babel/transformation/helpers/react.js
rename to src/babel/transformation/helpers/react.js
diff --git a/lib/babel/transformation/helpers/remap-async-to-generator.js b/src/babel/transformation/helpers/remap-async-to-generator.js
similarity index 100%
rename from lib/babel/transformation/helpers/remap-async-to-generator.js
rename to src/babel/transformation/helpers/remap-async-to-generator.js
diff --git a/lib/babel/transformation/helpers/replace-supers.js b/src/babel/transformation/helpers/replace-supers.js
similarity index 100%
rename from lib/babel/transformation/helpers/replace-supers.js
rename to src/babel/transformation/helpers/replace-supers.js
diff --git a/lib/babel/transformation/helpers/use-strict.js b/src/babel/transformation/helpers/use-strict.js
similarity index 100%
rename from lib/babel/transformation/helpers/use-strict.js
rename to src/babel/transformation/helpers/use-strict.js
diff --git a/lib/babel/transformation/index.js b/src/babel/transformation/index.js
similarity index 100%
rename from lib/babel/transformation/index.js
rename to src/babel/transformation/index.js
diff --git a/lib/babel/transformation/modules/_default.js b/src/babel/transformation/modules/_default.js
similarity index 100%
rename from lib/babel/transformation/modules/_default.js
rename to src/babel/transformation/modules/_default.js
diff --git a/lib/babel/transformation/modules/_strict.js b/src/babel/transformation/modules/_strict.js
similarity index 100%
rename from lib/babel/transformation/modules/_strict.js
rename to src/babel/transformation/modules/_strict.js
diff --git a/lib/babel/transformation/modules/amd-strict.js b/src/babel/transformation/modules/amd-strict.js
similarity index 100%
rename from lib/babel/transformation/modules/amd-strict.js
rename to src/babel/transformation/modules/amd-strict.js
diff --git a/lib/babel/transformation/modules/amd.js b/src/babel/transformation/modules/amd.js
similarity index 100%
rename from lib/babel/transformation/modules/amd.js
rename to src/babel/transformation/modules/amd.js
diff --git a/lib/babel/transformation/modules/common-strict.js b/src/babel/transformation/modules/common-strict.js
similarity index 100%
rename from lib/babel/transformation/modules/common-strict.js
rename to src/babel/transformation/modules/common-strict.js
diff --git a/lib/babel/transformation/modules/common.js b/src/babel/transformation/modules/common.js
similarity index 100%
rename from lib/babel/transformation/modules/common.js
rename to src/babel/transformation/modules/common.js
diff --git a/lib/babel/transformation/modules/ignore.js b/src/babel/transformation/modules/ignore.js
similarity index 100%
rename from lib/babel/transformation/modules/ignore.js
rename to src/babel/transformation/modules/ignore.js
diff --git a/lib/babel/transformation/modules/index.js b/src/babel/transformation/modules/index.js
similarity index 100%
rename from lib/babel/transformation/modules/index.js
rename to src/babel/transformation/modules/index.js
diff --git a/lib/babel/transformation/modules/system.js b/src/babel/transformation/modules/system.js
similarity index 100%
rename from lib/babel/transformation/modules/system.js
rename to src/babel/transformation/modules/system.js
diff --git a/lib/babel/transformation/modules/umd-strict.js b/src/babel/transformation/modules/umd-strict.js
similarity index 100%
rename from lib/babel/transformation/modules/umd-strict.js
rename to src/babel/transformation/modules/umd-strict.js
diff --git a/lib/babel/transformation/modules/umd.js b/src/babel/transformation/modules/umd.js
similarity index 100%
rename from lib/babel/transformation/modules/umd.js
rename to src/babel/transformation/modules/umd.js
diff --git a/src/babel/transformation/templates/.babelrc b/src/babel/transformation/templates/.babelrc
new file mode 100644
index 0000000000..2dae4b699f
--- /dev/null
+++ b/src/babel/transformation/templates/.babelrc
@@ -0,0 +1,3 @@
+{
+  "blacklist": ["useStrict", "es6.blockScoping"]
+}
diff --git a/lib/babel/transformation/templates/abstract-expression-call.js b/src/babel/transformation/templates/abstract-expression-call.js
similarity index 100%
rename from lib/babel/transformation/templates/abstract-expression-call.js
rename to src/babel/transformation/templates/abstract-expression-call.js
diff --git a/lib/babel/transformation/templates/abstract-expression-delete.js b/src/babel/transformation/templates/abstract-expression-delete.js
similarity index 100%
rename from lib/babel/transformation/templates/abstract-expression-delete.js
rename to src/babel/transformation/templates/abstract-expression-delete.js
diff --git a/lib/babel/transformation/templates/abstract-expression-get.js b/src/babel/transformation/templates/abstract-expression-get.js
similarity index 100%
rename from lib/babel/transformation/templates/abstract-expression-get.js
rename to src/babel/transformation/templates/abstract-expression-get.js
diff --git a/lib/babel/transformation/templates/abstract-expression-set.js b/src/babel/transformation/templates/abstract-expression-set.js
similarity index 100%
rename from lib/babel/transformation/templates/abstract-expression-set.js
rename to src/babel/transformation/templates/abstract-expression-set.js
diff --git a/lib/babel/transformation/templates/apply-constructor.js b/src/babel/transformation/templates/apply-constructor.js
similarity index 100%
rename from lib/babel/transformation/templates/apply-constructor.js
rename to src/babel/transformation/templates/apply-constructor.js
diff --git a/lib/babel/transformation/templates/array-comprehension-container.js b/src/babel/transformation/templates/array-comprehension-container.js
similarity index 100%
rename from lib/babel/transformation/templates/array-comprehension-container.js
rename to src/babel/transformation/templates/array-comprehension-container.js
diff --git a/lib/babel/transformation/templates/array-from.js b/src/babel/transformation/templates/array-from.js
similarity index 100%
rename from lib/babel/transformation/templates/array-from.js
rename to src/babel/transformation/templates/array-from.js
diff --git a/lib/babel/transformation/templates/array-push.js b/src/babel/transformation/templates/array-push.js
similarity index 100%
rename from lib/babel/transformation/templates/array-push.js
rename to src/babel/transformation/templates/array-push.js
diff --git a/lib/babel/transformation/templates/async-to-generator.js b/src/babel/transformation/templates/async-to-generator.js
similarity index 100%
rename from lib/babel/transformation/templates/async-to-generator.js
rename to src/babel/transformation/templates/async-to-generator.js
diff --git a/lib/babel/transformation/templates/bind.js b/src/babel/transformation/templates/bind.js
similarity index 100%
rename from lib/babel/transformation/templates/bind.js
rename to src/babel/transformation/templates/bind.js
diff --git a/lib/babel/transformation/templates/call.js b/src/babel/transformation/templates/call.js
similarity index 100%
rename from lib/babel/transformation/templates/call.js
rename to src/babel/transformation/templates/call.js
diff --git a/lib/babel/transformation/templates/class-call-check.js b/src/babel/transformation/templates/class-call-check.js
similarity index 100%
rename from lib/babel/transformation/templates/class-call-check.js
rename to src/babel/transformation/templates/class-call-check.js
diff --git a/lib/babel/transformation/templates/class-super-constructor-call-loose.js b/src/babel/transformation/templates/class-super-constructor-call-loose.js
similarity index 100%
rename from lib/babel/transformation/templates/class-super-constructor-call-loose.js
rename to src/babel/transformation/templates/class-super-constructor-call-loose.js
diff --git a/lib/babel/transformation/templates/class-super-constructor-call.js b/src/babel/transformation/templates/class-super-constructor-call.js
similarity index 100%
rename from lib/babel/transformation/templates/class-super-constructor-call.js
rename to src/babel/transformation/templates/class-super-constructor-call.js
diff --git a/lib/babel/transformation/templates/corejs-is-iterator.js b/src/babel/transformation/templates/corejs-is-iterator.js
similarity index 100%
rename from lib/babel/transformation/templates/corejs-is-iterator.js
rename to src/babel/transformation/templates/corejs-is-iterator.js
diff --git a/lib/babel/transformation/templates/corejs-iterator.js b/src/babel/transformation/templates/corejs-iterator.js
similarity index 100%
rename from lib/babel/transformation/templates/corejs-iterator.js
rename to src/babel/transformation/templates/corejs-iterator.js
diff --git a/lib/babel/transformation/templates/default-parameter.js b/src/babel/transformation/templates/default-parameter.js
similarity index 100%
rename from lib/babel/transformation/templates/default-parameter.js
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rename from lib/babel/transformation/transformers/other/use-strict.js
rename to src/babel/transformation/transformers/other/use-strict.js
diff --git a/lib/babel/transformation/transformers/playground/mallet-operator.js b/src/babel/transformation/transformers/playground/mallet-operator.js
similarity index 100%
rename from lib/babel/transformation/transformers/playground/mallet-operator.js
rename to src/babel/transformation/transformers/playground/mallet-operator.js
diff --git a/lib/babel/transformation/transformers/playground/memoization-operator.js b/src/babel/transformation/transformers/playground/memoization-operator.js
similarity index 100%
rename from lib/babel/transformation/transformers/playground/memoization-operator.js
rename to src/babel/transformation/transformers/playground/memoization-operator.js
diff --git a/lib/babel/transformation/transformers/playground/method-binding.js b/src/babel/transformation/transformers/playground/method-binding.js
similarity index 100%
rename from lib/babel/transformation/transformers/playground/method-binding.js
rename to src/babel/transformation/transformers/playground/method-binding.js
diff --git a/lib/babel/transformation/transformers/playground/object-getter-memoization.js b/src/babel/transformation/transformers/playground/object-getter-memoization.js
similarity index 100%
rename from lib/babel/transformation/transformers/playground/object-getter-memoization.js
rename to src/babel/transformation/transformers/playground/object-getter-memoization.js
diff --git a/lib/babel/transformation/transformers/spec/block-scoped-functions.js b/src/babel/transformation/transformers/spec/block-scoped-functions.js
similarity index 100%
rename from lib/babel/transformation/transformers/spec/block-scoped-functions.js
rename to src/babel/transformation/transformers/spec/block-scoped-functions.js
diff --git a/lib/babel/transformation/transformers/spec/function-name.js b/src/babel/transformation/transformers/spec/function-name.js
similarity index 100%
rename from lib/babel/transformation/transformers/spec/function-name.js
rename to src/babel/transformation/transformers/spec/function-name.js
diff --git a/lib/babel/transformation/transformers/spec/proto-to-assign.js b/src/babel/transformation/transformers/spec/proto-to-assign.js
similarity index 100%
rename from lib/babel/transformation/transformers/spec/proto-to-assign.js
rename to src/babel/transformation/transformers/spec/proto-to-assign.js
diff --git a/lib/babel/transformation/transformers/spec/typeof-symbol.js b/src/babel/transformation/transformers/spec/typeof-symbol.js
similarity index 100%
rename from lib/babel/transformation/transformers/spec/typeof-symbol.js
rename to src/babel/transformation/transformers/spec/typeof-symbol.js
diff --git a/lib/babel/transformation/transformers/spec/undefined-to-void.js b/src/babel/transformation/transformers/spec/undefined-to-void.js
similarity index 100%
rename from lib/babel/transformation/transformers/spec/undefined-to-void.js
rename to src/babel/transformation/transformers/spec/undefined-to-void.js
diff --git a/lib/babel/transformation/transformers/validation/no-for-in-of-assignment.js b/src/babel/transformation/transformers/validation/no-for-in-of-assignment.js
similarity index 100%
rename from lib/babel/transformation/transformers/validation/no-for-in-of-assignment.js
rename to src/babel/transformation/transformers/validation/no-for-in-of-assignment.js
diff --git a/lib/babel/transformation/transformers/validation/react.js b/src/babel/transformation/transformers/validation/react.js
similarity index 100%
rename from lib/babel/transformation/transformers/validation/react.js
rename to src/babel/transformation/transformers/validation/react.js
diff --git a/lib/babel/transformation/transformers/validation/setters.js b/src/babel/transformation/transformers/validation/setters.js
similarity index 100%
rename from lib/babel/transformation/transformers/validation/setters.js
rename to src/babel/transformation/transformers/validation/setters.js
diff --git a/lib/babel/transformation/transformers/validation/undeclared-variable-check.js b/src/babel/transformation/transformers/validation/undeclared-variable-check.js
similarity index 100%
rename from lib/babel/transformation/transformers/validation/undeclared-variable-check.js
rename to src/babel/transformation/transformers/validation/undeclared-variable-check.js
diff --git a/lib/babel/traversal/context.js b/src/babel/traversal/context.js
similarity index 100%
rename from lib/babel/traversal/context.js
rename to src/babel/traversal/context.js
diff --git a/lib/babel/traversal/index.js b/src/babel/traversal/index.js
similarity index 100%
rename from lib/babel/traversal/index.js
rename to src/babel/traversal/index.js
diff --git a/lib/babel/traversal/path.js b/src/babel/traversal/path.js
similarity index 100%
rename from lib/babel/traversal/path.js
rename to src/babel/traversal/path.js
diff --git a/lib/babel/traversal/scope.js b/src/babel/traversal/scope.js
similarity index 100%
rename from lib/babel/traversal/scope.js
rename to src/babel/traversal/scope.js
diff --git a/lib/babel/types/alias-keys.json b/src/babel/types/alias-keys.json
similarity index 100%
rename from lib/babel/types/alias-keys.json
rename to src/babel/types/alias-keys.json
diff --git a/lib/babel/types/builder-keys.json b/src/babel/types/builder-keys.json
similarity index 100%
rename from lib/babel/types/builder-keys.json
rename to src/babel/types/builder-keys.json
diff --git a/lib/babel/types/index.js b/src/babel/types/index.js
similarity index 100%
rename from lib/babel/types/index.js
rename to src/babel/types/index.js
diff --git a/lib/babel/types/visitor-keys.json b/src/babel/types/visitor-keys.json
similarity index 100%
rename from lib/babel/types/visitor-keys.json
rename to src/babel/types/visitor-keys.json
diff --git a/lib/babel/util.js b/src/babel/util.js
similarity index 81%
rename from lib/babel/util.js
rename to src/babel/util.js
index 803e0b4eb4..2b0b935838 100644
--- a/lib/babel/util.js
+++ b/src/babel/util.js
@@ -2,20 +2,21 @@
 
 require("./patch");
 
-var cloneDeep  = require("lodash/lang/cloneDeep");
-var contains   = require("lodash/collection/contains");
-var traverse   = require("./traversal");
-var isString   = require("lodash/lang/isString");
-var isRegExp   = require("lodash/lang/isRegExp");
-var isEmpty    = require("lodash/lang/isEmpty");
-var parse      = require("./helpers/parse");
-var debug      = require("debug/node");
-var path       = require("path");
-var util       = require("util");
-var each       = require("lodash/collection/each");
-var has        = require("lodash/object/has");
-var fs         = require("fs");
-var t          = require("./types");
+var cloneDeep = require("lodash/lang/cloneDeep");
+var isBoolean = require("lodash/lang/isBoolean");
+var contains  = require("lodash/collection/contains");
+var traverse  = require("./traversal");
+var isString  = require("lodash/lang/isString");
+var isRegExp  = require("lodash/lang/isRegExp");
+var isEmpty   = require("lodash/lang/isEmpty");
+var parse     = require("./helpers/parse");
+var debug     = require("debug/node");
+var path      = require("path");
+var util      = require("util");
+var each      = require("lodash/collection/each");
+var has       = require("lodash/object/has");
+var fs        = require("fs");
+var t         = require("./types");
 
 exports.inherits = util.inherits;
 
@@ -51,6 +52,7 @@ exports.regexify = function (val) {
 
 exports.arrayify = function (val) {
   if (!val) return [];
+  if (isBoolean(val)) return [val];
   if (isString(val)) return exports.list(val);
   if (Array.isArray(val)) return val;
   throw new TypeError("illegal type for arrayify");
diff --git a/test/.babelrc b/test/.babelrc
new file mode 100644
index 0000000000..3a8f8eb911
--- /dev/null
+++ b/test/.babelrc
@@ -0,0 +1,3 @@
+{
+  "breakConfig": true
+}