diff --git a/README.md b/README.md
index c62ac45f67..b9dd9fd937 100644
--- a/README.md
+++ b/README.md
@@ -102,6 +102,10 @@ map embedded in a comment at the bottom.
 Compile the entire `src` directory and output it to the `lib` directory.
 
     $ 6to5 src --out-dir lib
+    
+Compile the entire `src` directory and output it to the one concatenated file.
+    
+    $ 6to5 src --out-file script-compiled.js
 
 Pipe a file in via stdin and output it to `script-compiled.js`
 
diff --git a/bin/6to5/file.js b/bin/6to5/file.js
index f59eb6d978..82112f8cfb 100644
--- a/bin/6to5/file.js
+++ b/bin/6to5/file.js
@@ -100,8 +100,8 @@ module.exports = function (commander, filenames) {
       }
     });
 
-    _.each(_filenames, function (filename, i) {
-      results.push(util.compile(filename, { _noStrict: +i !== 0 }));
+    _.each(_filenames, function (filename) {
+      results.push(util.compile(filename));
     });
 
     output();
diff --git a/lib/6to5/register.js b/lib/6to5/register.js
index 2cd90de4b9..69f68322c0 100644
--- a/lib/6to5/register.js
+++ b/lib/6to5/register.js
@@ -90,13 +90,9 @@ module.exports = function (opts) {
   opts = opts || {};
   if (_.isRegExp(opts)) opts = { ignoreRegex: opts };
 
-  if (opts.ignoreRegex != null) {
-    ignoreRegex = opts.ignoreRegex;
-  }
-
-  if (opts.blacklist) {
-    blacklist = opts.blacklist;
-  }
+  if (opts.ignoreRegex != null) ignoreRegex = opts.ignoreRegex;
 
   if (opts.extensions) hookExtensions(opts.extensions);
+
+  if (opts.blacklist) blacklist = opts.blacklist;
 };
diff --git a/lib/6to5/transform.js b/lib/6to5/transform.js
index 749796bde2..144fc68e83 100644
--- a/lib/6to5/transform.js
+++ b/lib/6to5/transform.js
@@ -105,6 +105,7 @@ transform.transformers = {
   forOf:                    require("./transformers/for-of"),
   unicodeRegex:             require("./transformers/unicode-regex"),
   generators:               require("./transformers/generators"),
+  numericLiterals:          require("./transformers/numeric-literals"),
 
   react:                    require("./transformers/react"),
   jsx:                      require("./transformers/jsx"),
@@ -112,9 +113,10 @@ transform.transformers = {
   _aliasFunctions:          require("./transformers/_alias-functions"),
   _blockHoist:              require("./transformers/_block-hoist"),
   _declarations:            require("./transformers/_declarations"),
-  _moduleFormatter:         require("./transformers/_module-formatter"),
 
-  useStrict:                require("./transformers/use-strict")
+  useStrict:                require("./transformers/use-strict"),
+
+  _moduleFormatter:         require("./transformers/_module-formatter")
 };
 
 transform.moduleFormatters = {
diff --git a/lib/6to5/transformers/numeric-literals.js b/lib/6to5/transformers/numeric-literals.js
new file mode 100644
index 0000000000..511d3c5c2a
--- /dev/null
+++ b/lib/6to5/transformers/numeric-literals.js
@@ -0,0 +1,6 @@
+var _ = require("lodash");
+
+exports.Literal = function (node) {
+  // TODO: remove this when the new code generator is released
+  if (_.isNumber(node.value)) delete node.raw;
+};
diff --git a/lib/6to5/transformers/use-strict.js b/lib/6to5/transformers/use-strict.js
index f3fedf89df..c116c0990c 100644
--- a/lib/6to5/transformers/use-strict.js
+++ b/lib/6to5/transformers/use-strict.js
@@ -1,15 +1,12 @@
 var b = require("../builders");
 
-module.exports = function (ast, file) {
+module.exports = function (ast) {
   var body = ast.program.body;
   var first = body[0];
 
   var noStrict = !first || first.type !== "ExpressionStatement" || first.expression.type !== "Literal" || first.expression.value !== "use strict";
 
   if (noStrict) {
-    if (file.opts._noStrict) return;
     body.unshift(b.expressionStatement(b.literal("use strict")));
-  } else {
-    if (file.opts._noStrict) body.shift();
   }
 };
diff --git a/package.json b/package.json
index 9d07063bed..80aa9dcd21 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "6to5",
   "description": "Turn ES6 code into readable vanilla ES5 with source maps",
-  "version": "1.10.9",
+  "version": "1.10.10",
   "author": "Sebastian McKenzie <sebmck@gmail.com>",
   "homepage": "https://github.com/sebmck/6to5",
   "repository": {
diff --git a/test/fixtures/transformation/modules-amd/exports-default/expected.js b/test/fixtures/transformation/modules-amd/exports-default/expected.js
index 57ec077324..4f9aa2bd7a 100644
--- a/test/fixtures/transformation/modules-amd/exports-default/expected.js
+++ b/test/fixtures/transformation/modules-amd/exports-default/expected.js
@@ -1,6 +1,6 @@
-"use strict";
-
 define(["exports"], function (exports) {
+  "use strict";
+
   exports.default = 42;
   exports.default = {};
   exports.default = [];
diff --git a/test/fixtures/transformation/modules-amd/exports-from/expected.js b/test/fixtures/transformation/modules-amd/exports-from/expected.js
index ccc86bb287..c07afa4b5d 100644
--- a/test/fixtures/transformation/modules-amd/exports-from/expected.js
+++ b/test/fixtures/transformation/modules-amd/exports-from/expected.js
@@ -1,6 +1,6 @@
-"use strict";
-
 define(["exports", "foo"], function (exports, _foo) {
+  "use strict";
+
   (function(obj) {
     for (var i in obj) {
       exports[i] = obj[i];
diff --git a/test/fixtures/transformation/modules-amd/exports-named/expected.js b/test/fixtures/transformation/modules-amd/exports-named/expected.js
index 125898775b..2bdf3ee4d1 100644
--- a/test/fixtures/transformation/modules-amd/exports-named/expected.js
+++ b/test/fixtures/transformation/modules-amd/exports-named/expected.js
@@ -1,6 +1,6 @@
-"use strict";
-
 define(["exports"], function (exports) {
+  "use strict";
+
   exports.foo = foo;
   exports.foo = foo;
   exports.bar = bar;
diff --git a/test/fixtures/transformation/modules-amd/exports-variable/expected.js b/test/fixtures/transformation/modules-amd/exports-variable/expected.js
index b985e7bb94..ae135f88f3 100644
--- a/test/fixtures/transformation/modules-amd/exports-variable/expected.js
+++ b/test/fixtures/transformation/modules-amd/exports-variable/expected.js
@@ -1,6 +1,6 @@
-"use strict";
-
 define(["exports"], function (exports) {
+  "use strict";
+
   exports.foo7 = foo7;
   var foo = 1;
   exports.foo = foo;
diff --git a/test/fixtures/transformation/modules-amd/hoist-function-exports/expected.js b/test/fixtures/transformation/modules-amd/hoist-function-exports/expected.js
index 17968c6588..902cf1a327 100644
--- a/test/fixtures/transformation/modules-amd/hoist-function-exports/expected.js
+++ b/test/fixtures/transformation/modules-amd/hoist-function-exports/expected.js
@@ -1,6 +1,6 @@
-"use strict";
-
 define(["exports", "./evens"], function (exports, _evens) {
+  "use strict";
+
   exports.nextOdd = nextOdd;
   var isEven = _evens.isEven;
 
diff --git a/test/fixtures/transformation/modules-amd/imports-default/expected.js b/test/fixtures/transformation/modules-amd/imports-default/expected.js
index ae21f99267..7febc6bc17 100644
--- a/test/fixtures/transformation/modules-amd/imports-default/expected.js
+++ b/test/fixtures/transformation/modules-amd/imports-default/expected.js
@@ -1,6 +1,5 @@
-"use strict";
-
 define(["exports", "foo"], function (exports, _foo) {
+  "use strict";
   var foo = _foo.default;
   var foo = _foo.default;
 });
diff --git a/test/fixtures/transformation/modules-amd/imports-glob/expected.js b/test/fixtures/transformation/modules-amd/imports-glob/expected.js
index 414d126b14..5c42e9d59a 100644
--- a/test/fixtures/transformation/modules-amd/imports-glob/expected.js
+++ b/test/fixtures/transformation/modules-amd/imports-glob/expected.js
@@ -1,5 +1,4 @@
-"use strict";
-
 define(["exports", "foo"], function (exports, _foo) {
+  "use strict";
   var foo = _foo;
 });
diff --git a/test/fixtures/transformation/modules-amd/imports-mixing/expected.js b/test/fixtures/transformation/modules-amd/imports-mixing/expected.js
index c828bb3ed4..37eced8d5b 100644
--- a/test/fixtures/transformation/modules-amd/imports-mixing/expected.js
+++ b/test/fixtures/transformation/modules-amd/imports-mixing/expected.js
@@ -1,6 +1,6 @@
-"use strict";
-
 define(["exports", "foo"], function (exports, _foo) {
+  "use strict";
+
   var foo = _foo.default;
   var xyz = _foo.baz;
 });
diff --git a/test/fixtures/transformation/modules-amd/imports-named/expected.js b/test/fixtures/transformation/modules-amd/imports-named/expected.js
index 8912d46bae..5a8e29831e 100644
--- a/test/fixtures/transformation/modules-amd/imports-named/expected.js
+++ b/test/fixtures/transformation/modules-amd/imports-named/expected.js
@@ -1,6 +1,6 @@
-"use strict";
-
 define(["exports", "foo"], function (exports, _foo) {
+  "use strict";
+
   var bar = _foo.bar;
   var bar = _foo.bar;
   var baz = _foo.baz;
diff --git a/test/fixtures/transformation/modules-amd/imports/expected.js b/test/fixtures/transformation/modules-amd/imports/expected.js
index 9392abf4a0..7191917e73 100644
--- a/test/fixtures/transformation/modules-amd/imports/expected.js
+++ b/test/fixtures/transformation/modules-amd/imports/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 define(["exports", "foo", "foo-bar", "./directory/foo-bar"], function (exports, _foo, _fooBar, _directoryFooBar) {
-
+  "use strict";
 });
diff --git a/test/fixtures/transformation/modules-amd/overview/expected.js b/test/fixtures/transformation/modules-amd/overview/expected.js
index 27636b2e02..48f4c57715 100644
--- a/test/fixtures/transformation/modules-amd/overview/expected.js
+++ b/test/fixtures/transformation/modules-amd/overview/expected.js
@@ -1,6 +1,6 @@
-"use strict";
-
 define(["exports", "foo", "foo-bar", "./directory/foo-bar"], function (exports, _foo, _fooBar, _directoryFooBar) {
+  "use strict";
+
   var foo = _foo.default;
   var foo = _foo;
   var bar = _foo.bar;
diff --git a/test/fixtures/transformation/modules-umd/exports-default/expected.js b/test/fixtures/transformation/modules-umd/exports-default/expected.js
index 4de9ddd916..1558d65e8e 100644
--- a/test/fixtures/transformation/modules-umd/exports-default/expected.js
+++ b/test/fixtures/transformation/modules-umd/exports-default/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports"], factory);
@@ -7,6 +5,8 @@
     factory(exports);
   }
 })(function (exports) {
+  "use strict";
+
   exports.default = 42;
   exports.default = {};
   exports.default = [];
diff --git a/test/fixtures/transformation/modules-umd/exports-from/expected.js b/test/fixtures/transformation/modules-umd/exports-from/expected.js
index 36887ea7cd..56b1a7561e 100644
--- a/test/fixtures/transformation/modules-umd/exports-from/expected.js
+++ b/test/fixtures/transformation/modules-umd/exports-from/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports", "foo"], factory);
@@ -7,6 +5,8 @@
     factory(exports, require("foo"));
   }
 })(function (exports, _foo) {
+  "use strict";
+
   (function(obj) {
     for (var i in obj) {
       exports[i] = obj[i];
diff --git a/test/fixtures/transformation/modules-umd/exports-named/expected.js b/test/fixtures/transformation/modules-umd/exports-named/expected.js
index 8d48d6f6cd..d8a3a136eb 100644
--- a/test/fixtures/transformation/modules-umd/exports-named/expected.js
+++ b/test/fixtures/transformation/modules-umd/exports-named/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports"], factory);
@@ -7,6 +5,8 @@
     factory(exports);
   }
 })(function (exports) {
+  "use strict";
+
   exports.foo = foo;
   exports.foo = foo;
   exports.bar = bar;
diff --git a/test/fixtures/transformation/modules-umd/exports-variable/expected.js b/test/fixtures/transformation/modules-umd/exports-variable/expected.js
index 830192694b..307b548bc6 100644
--- a/test/fixtures/transformation/modules-umd/exports-variable/expected.js
+++ b/test/fixtures/transformation/modules-umd/exports-variable/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports"], factory);
@@ -7,6 +5,8 @@
     factory(exports);
   }
 })(function (exports) {
+  "use strict";
+
   exports.foo7 = foo7;
   var foo = 1;
   exports.foo = foo;
diff --git a/test/fixtures/transformation/modules-umd/hoist-function-exports/expected.js b/test/fixtures/transformation/modules-umd/hoist-function-exports/expected.js
index 914737417b..c9afc83ea8 100644
--- a/test/fixtures/transformation/modules-umd/hoist-function-exports/expected.js
+++ b/test/fixtures/transformation/modules-umd/hoist-function-exports/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports", "./evens"], factory);
@@ -7,6 +5,8 @@
     factory(exports, require("./evens"));
   }
 })(function (exports, _evens) {
+  "use strict";
+
   exports.nextOdd = nextOdd;
   var isEven = _evens.isEven;
 
diff --git a/test/fixtures/transformation/modules-umd/imports-default/expected.js b/test/fixtures/transformation/modules-umd/imports-default/expected.js
index f2434dfe71..1b3a501cbc 100644
--- a/test/fixtures/transformation/modules-umd/imports-default/expected.js
+++ b/test/fixtures/transformation/modules-umd/imports-default/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports", "foo"], factory);
@@ -7,6 +5,8 @@
     factory(exports, require("foo"));
   }
 })(function (exports, _foo) {
+  "use strict";
+
   var foo = _foo.default;
   var foo = _foo.default;
 });
diff --git a/test/fixtures/transformation/modules-umd/imports-glob/expected.js b/test/fixtures/transformation/modules-umd/imports-glob/expected.js
index 7dc4aeb30a..4a07639cde 100644
--- a/test/fixtures/transformation/modules-umd/imports-glob/expected.js
+++ b/test/fixtures/transformation/modules-umd/imports-glob/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports", "foo"], factory);
@@ -7,5 +5,6 @@
     factory(exports, require("foo"));
   }
 })(function (exports, _foo) {
+  "use strict";
   var foo = _foo;
 });
diff --git a/test/fixtures/transformation/modules-umd/imports-mixing/expected.js b/test/fixtures/transformation/modules-umd/imports-mixing/expected.js
index 97f74e3918..4dd5c7b377 100644
--- a/test/fixtures/transformation/modules-umd/imports-mixing/expected.js
+++ b/test/fixtures/transformation/modules-umd/imports-mixing/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports", "foo"], factory);
@@ -7,6 +5,7 @@
     factory(exports, require("foo"));
   }
 })(function (exports, _foo) {
+  "use strict";
   var foo = _foo.default;
   var xyz = _foo.baz;
 });
diff --git a/test/fixtures/transformation/modules-umd/imports-named/expected.js b/test/fixtures/transformation/modules-umd/imports-named/expected.js
index 896105f29c..a2bca67e08 100644
--- a/test/fixtures/transformation/modules-umd/imports-named/expected.js
+++ b/test/fixtures/transformation/modules-umd/imports-named/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports", "foo"], factory);
@@ -7,6 +5,7 @@
     factory(exports, require("foo"));
   }
 })(function (exports, _foo) {
+  "use strict";
   var bar = _foo.bar;
   var bar = _foo.bar;
   var baz = _foo.baz;
diff --git a/test/fixtures/transformation/modules-umd/imports/expected.js b/test/fixtures/transformation/modules-umd/imports/expected.js
index a80b499447..81b4069c95 100644
--- a/test/fixtures/transformation/modules-umd/imports/expected.js
+++ b/test/fixtures/transformation/modules-umd/imports/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports", "foo", "foo-bar", "./directory/foo-bar"], factory);
@@ -7,5 +5,5 @@
     factory(exports, require("foo"), require("foo-bar"), require("./directory/foo-bar"));
   }
 })(function (exports, _foo, _fooBar, _directoryFooBar) {
-
+  "use strict";
 });
diff --git a/test/fixtures/transformation/modules-umd/overview/expected.js b/test/fixtures/transformation/modules-umd/overview/expected.js
index 66095d379c..6c539683dc 100644
--- a/test/fixtures/transformation/modules-umd/overview/expected.js
+++ b/test/fixtures/transformation/modules-umd/overview/expected.js
@@ -1,5 +1,3 @@
-"use strict";
-
 (function (factory) {
   if (typeof define === "function" && define.amd) {
     define(["exports", "foo", "foo-bar", "./directory/foo-bar"], factory);
@@ -7,6 +5,7 @@
     factory(exports, require("foo"), require("foo-bar"), require("./directory/foo-bar"));
   }
 })(function (exports, _foo, _fooBar, _directoryFooBar) {
+  "use strict";
   var foo = _foo.default;
   var foo = _foo;
   var bar = _foo.bar;