remove es20xx prefixes from plugins and rename folders (#6575)

packages/babel-plugin-transform-classes/test/fixtures/spec/super-reference-before-in-lambda/actual.js

@@ -0,0 +1,6 @@
+class Foo extends Bar {
+  constructor() {
+    const t = () => super.test()
+    super();
+  }
+}

packages/babel-plugin-transform-classes/test/fixtures/spec/super-reference-before-in-lambda/expected.js

@@ -0,0 +1,17 @@
+var Foo =
+/*#__PURE__*/
+function (_Bar) {
+  babelHelpers.inherits(Foo, _Bar);
+
+  function Foo() {
+    var _this;
+
+    babelHelpers.classCallCheck(this, Foo);
+
+    var t = () => babelHelpers.get(Foo.prototype.__proto__ || Object.getPrototypeOf(Foo.prototype), "test", _this).call(_this);
+
+    return _this = babelHelpers.possibleConstructorReturn(this, (Foo.__proto__ || Object.getPrototypeOf(Foo)).call(this));
+  }
+
+  return Foo;
+}(Bar);

packages/babel-plugin-transform-classes/test/fixtures/spec/super-reference-before-in-lambda/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["external-helpers", "transform-classes", "transform-block-scoping"]
+}