Compile classes when spread is unsupported (#13075)

packages/babel-compat-data/data/plugins.json

@@ -320,7 +320,7 @@
     "chrome": "46",
     "opera": "33",
     "edge": "13",
-    "firefox": "36",
+    "firefox": "45",
     "safari": "10",
     "node": "5",
     "ios": "10",

packages/babel-compat-data/scripts/data/plugin-features.js

@@ -72,7 +72,14 @@ const es2015 = {
     ],
   },
   "transform-spread": {
-    features: ["spread syntax for iterable objects"],
+    features: [
+      "spread syntax for iterable objects",
+      // We need to compile classes when spread is not supported, because
+      // we cannot compile super(...args) without also rewriting the
+      // "super" handling. There is a bugfix that makes it better.
+      "class",
+      "super",
+    ],
   },
   "transform-destructuring": {
     features: ["destructuring, assignment", "destructuring, declarations"],

packages/babel-compat-data/scripts/utils-build-data.js

@@ -88,7 +88,10 @@ exports.getLowestImplementedVersion = (
 };
 
 exports.generateData = (environments, features) => {
-  return Object.values(features).map(options => {
+  const data = {};
+
+  // eslint-disable-next-line prefer-const
+  for (let [key, options] of Object.entries(features)) {
     if (!options.features) {
       options = {
         features: [options],
@@ -103,8 +106,10 @@ exports.generateData = (environments, features) => {
     });
     addElectronSupportFromChromium(plugin);
 
-    return plugin;
-  });
+    data[key] = plugin;
+  }
+
+  return data;
 };
 
 exports.writeFile = function (data, dataPath, name) {

packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/input.js

@@ -0,0 +1,5 @@
+class A extends B {
+  constructor(args) {
+    super(...args)
+  }
+}

packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/options.json

@@ -0,0 +1,4 @@
+{
+  "targets": "firefox 40",
+  "presets": ["env"]
+}

packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/output.js

@@ -0,0 +1,14 @@
+var A = /*#__PURE__*/function (_B) {
+  "use strict";
+
+  babelHelpers.inherits(A, _B);
+
+  var _super = babelHelpers.createSuper(A);
+
+  function A(args) {
+    babelHelpers.classCallCheck(this, A);
+    return _super.call.apply(_super, [this].concat(babelHelpers.toConsumableArray(args)));
+  }
+
+  return A;
+}(B);