add commonStandard module formatter - fixes #675

will be merged into strict formatters in next major
TODO: rewrite all module formatters as they've gotten out of han

test/fixtures/transformation/es6-modules-common-standard/export/actual.js

@@ -0,0 +1,3 @@
+export function foo() {}
+export default foo;
+export { foo as default, foo };

test/fixtures/transformation/es6-modules-common-standard/export/expected.js

@@ -0,0 +1,7 @@
+"use strict";
+
+exports.foo = foo;
+function foo() {}
+exports["default"] = foo;
+exports["default"] = foo;
+exports.foo = foo;

test/fixtures/transformation/es6-modules-common-standard/import/actual.js

@@ -0,0 +1,4 @@
+import foo from "foo";
+import { default as foo } from "foo";
+import { foo } from "foo";
+import * as foo from "foo";

test/fixtures/transformation/es6-modules-common-standard/import/expected.js

@@ -0,0 +1,8 @@
+"use strict";
+
+var _foo = require("foo");
+
+var foo = _foo["default"];
+var foo = _foo["default"];
+var foo = _foo.foo;
+var foo = _foo;

test/fixtures/transformation/es6-modules-common-standard/options.json

@@ -0,0 +1,3 @@
+{
+  "modules": "commonStandard"
+}