diff --git a/.gitignore b/.gitignore
index 22345efbcd..897598d9c1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,9 +14,13 @@ dist
 /.package.json
 /packages/babel-runtime/core-js
 /packages/babel-runtime/helpers/*.js
+!/packages/babel-runtime/helpers/toArray.js
 /packages/babel-runtime/helpers/builtin/*.js
+!/packages/babel-runtime/helpers/builtin/toArray.js
 /packages/babel-runtime/helpers/builtin/es6/*.js
+!/packages/babel-runtime/helpers/builtin/es6/toArray.js
 /packages/babel-runtime/helpers/es6/*.js
+!/packages/babel-runtime/helpers/es6/toArray.js
 /packages/babel-register/test/.babel
 /packages/*/lib
 _babel.github.io
diff --git a/packages/babel-runtime/helpers/builtin/es6/toArray.js b/packages/babel-runtime/helpers/builtin/es6/toArray.js
new file mode 100644
index 0000000000..74e53155b9
--- /dev/null
+++ b/packages/babel-runtime/helpers/builtin/es6/toArray.js
@@ -0,0 +1,3 @@
+export default function (arr) {
+  return Array.isArray(arr) ? arr : Array.from(arr);
+}
\ No newline at end of file
diff --git a/packages/babel-runtime/helpers/builtin/toArray.js b/packages/babel-runtime/helpers/builtin/toArray.js
new file mode 100644
index 0000000000..aa850ef4c4
--- /dev/null
+++ b/packages/babel-runtime/helpers/builtin/toArray.js
@@ -0,0 +1,5 @@
+exports.__esModule = true;
+
+exports.default = function (arr) {
+  return Array.isArray(arr) ? arr : Array.from(arr);
+};
\ No newline at end of file
diff --git a/packages/babel-runtime/helpers/es6/toArray.js b/packages/babel-runtime/helpers/es6/toArray.js
new file mode 100644
index 0000000000..8aa5479738
--- /dev/null
+++ b/packages/babel-runtime/helpers/es6/toArray.js
@@ -0,0 +1,4 @@
+import _Array$from from "../../core-js/array/from";
+export default function (arr) {
+  return Array.isArray(arr) ? arr : _Array$from(arr);
+}
\ No newline at end of file
diff --git a/packages/babel-runtime/helpers/toArray.js b/packages/babel-runtime/helpers/toArray.js
new file mode 100644
index 0000000000..3104d8387f
--- /dev/null
+++ b/packages/babel-runtime/helpers/toArray.js
@@ -0,0 +1,11 @@
+exports.__esModule = true;
+
+var _from = require("../core-js/array/from");
+
+var _from2 = _interopRequireDefault(_from);
+
+exports.default = function (arr) {
+  return Array.isArray(arr) ? arr : (0, _from2.default)(arr);
+};
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
\ No newline at end of file
diff --git a/packages/babel-runtime/scripts/build-dist.js b/packages/babel-runtime/scripts/build-dist.js
index 481477537c..659f05dd9a 100644
--- a/packages/babel-runtime/scripts/build-dist.js
+++ b/packages/babel-runtime/scripts/build-dist.js
@@ -1,5 +1,10 @@
 const outputFile = require("output-file-sync");
+const kebabCase = require("lodash/kebabCase");
 const coreDefinitions = require("babel-plugin-transform-runtime").definitions;
+const helpers = require("babel-helpers");
+const babel = require("../../babel-core");
+const t = require("../../babel-types");
+
 const paths = ["is-iterable", "get-iterator"];
 
 Object.keys(coreDefinitions.builtins).forEach((key) => {
@@ -22,11 +27,6 @@ paths.forEach(function(path) {
   );
 });
 
-const helpers = require("babel-helpers");
-const babel = require("../../babel-core");
-const t = require("../../babel-types");
-
-
 function relative(filename) {
   return `${__dirname}/../${filename}`;
 }
@@ -135,13 +135,13 @@ for (const modules of ["commonjs", false]) {
         buildHelper(helperName, modules, builtin)
       );
 
-      // // compat
-      // var helperAlias = kebabCase(helperName);
-      // var content = !modules
-      //   ? `export { default } from \"./${helperName}.js\";`
-      //   : "module.exports = require(\"./" + helperName + ".js\");";
-      // writeFile(`${dirname}_${helperAlias}.js`, content);
-      // if (helperAlias !== helperName) writeFile(`${dirname}${helperAlias}.js`, content);
+      // compat
+      var helperAlias = kebabCase(helperName);
+      var content = !modules
+        ? `export { default } from \"./${helperName}.js\";`
+        : "module.exports = require(\"./" + helperName + ".js\");";
+      writeFile(`${dirname}_${helperAlias}.js`, content);
+      if (helperAlias !== helperName) writeFile(`${dirname}${helperAlias}.js`, content);
     }
   }
 }