fix exported classes with static class properties - fixes #2868

packages/babel-plugin-transform-class-properties/test/fixtures/general/static/actual.js

@@ -0,0 +1,3 @@
+class Foo {
+  static bar = "foo";
+}

packages/babel-plugin-transform-class-properties/test/fixtures/general/static/exec.js

@@ -0,0 +1,9 @@
+class Foo {
+  static num = 0;
+  static str = "foo";
+}
+
+assert.equal(Foo.num, 0);
+assert.equal(Foo.num = 1, 1);
+assert.equal(Foo.str, "foo");
+assert.equal(Foo.str = "bar", "bar");

packages/babel-plugin-transform-class-properties/test/fixtures/general/static/expected.js

@@ -0,0 +1,5 @@
+var Foo = function Foo() {
+  babelHelpers.classCallCheck(this, Foo);
+};
+
+Foo.bar = "foo";