retain method return types on transform-es2015-classes (closes #4665) (#4668)

packages/babel-plugin-transform-flow-comments/test/fixtures/flow-comments/transformed-class-method-loose-return-type-annotation/actual.js

@@ -0,0 +1,6 @@
+// @flow
+class C {
+  m(x: number): string {
+    return 'a';
+  }
+}

packages/babel-plugin-transform-flow-comments/test/fixtures/flow-comments/transformed-class-method-loose-return-type-annotation/expected.js

@@ -0,0 +1,14 @@
+'use strict';
+
+// @flow
+var C = function () {
+  function C() {
+    babelHelpers.classCallCheck(this, C);
+  }
+
+  C.prototype.m = function m(x /*: number*/) /*: string*/ {
+    return 'a';
+  };
+
+  return C;
+}();

packages/babel-plugin-transform-flow-comments/test/fixtures/flow-comments/transformed-class-method-loose-return-type-annotation/options.json

@@ -0,0 +1,4 @@
+{
+  "presets": [["es2015", { "loose": true }]],
+  "plugins": ["transform-flow-comments", "external-helpers"]
+}

packages/babel-plugin-transform-flow-comments/test/fixtures/flow-comments/transformed-class-method-return-type-annotation/actual.js

@@ -0,0 +1,6 @@
+// @flow
+class C {
+  m(x: number): string {
+    return 'a';
+  }
+}

packages/babel-plugin-transform-flow-comments/test/fixtures/flow-comments/transformed-class-method-return-type-annotation/expected.js

@@ -0,0 +1,16 @@
+'use strict';
+
+// @flow
+var C = function () {
+  function C() {
+    babelHelpers.classCallCheck(this, C);
+  }
+
+  babelHelpers.createClass(C, [{
+    key: 'm',
+    value: function m(x /*: number*/) /*: string*/ {
+      return 'a';
+    }
+  }]);
+  return C;
+}();

packages/babel-plugin-transform-flow-comments/test/fixtures/flow-comments/transformed-class-method-return-type-annotation/options.json

@@ -0,0 +1,4 @@
+{
+  "presets": ["es2015"],
+  "plugins": ["transform-flow-comments", "external-helpers"]
+}