From 18ed718cddd4a4ce0c69fbf1e590d33be225d00a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=B2=20Ribaudo?= <nicolo.ribaudo@gmail.com>
Date: Tue, 30 Mar 2021 13:24:14 +0200
Subject: [PATCH 1/3] Fix bug introduced by babel/babel#13024

---
 .../babel-compat-data/scripts/utils-build-data.js     | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/packages/babel-compat-data/scripts/utils-build-data.js b/packages/babel-compat-data/scripts/utils-build-data.js
index 05bd79dc062a..33e7dca92986 100644
--- a/packages/babel-compat-data/scripts/utils-build-data.js
+++ b/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) {

From 2dbc43487054df141c4b43134c444c089ab93c43 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=B2=20Ribaudo?= <nicolo.ribaudo@gmail.com>
Date: Tue, 30 Mar 2021 13:25:15 +0200
Subject: [PATCH 2/3] Compile spread when compiling classes

---
 packages/babel-compat-data/data/plugins.json             | 2 +-
 .../babel-compat-data/scripts/data/plugin-features.js    | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/packages/babel-compat-data/data/plugins.json b/packages/babel-compat-data/data/plugins.json
index 4c6bca47064f..bbc8eb991390 100644
--- a/packages/babel-compat-data/data/plugins.json
+++ b/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",
diff --git a/packages/babel-compat-data/scripts/data/plugin-features.js b/packages/babel-compat-data/scripts/data/plugin-features.js
index 2e6c23a0e8f8..3c4a0298c075 100644
--- a/packages/babel-compat-data/scripts/data/plugin-features.js
+++ b/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"],

From f07469078082de25e5d1a3c38f5b0c6273f890a3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=B2=20Ribaudo?= <nicolo.ribaudo@gmail.com>
Date: Tue, 30 Mar 2021 13:28:20 +0200
Subject: [PATCH 3/3] Add test

---
 .../spread-super-firefox-40/input.js               |  5 +++++
 .../spread-super-firefox-40/options.json           |  4 ++++
 .../spread-super-firefox-40/output.js              | 14 ++++++++++++++
 3 files changed, 23 insertions(+)
 create mode 100644 packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/input.js
 create mode 100644 packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/options.json
 create mode 100644 packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/output.js

diff --git a/packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/input.js b/packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/input.js
new file mode 100644
index 000000000000..4e30b070c313
--- /dev/null
+++ b/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)
+  }
+}
diff --git a/packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/options.json b/packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/options.json
new file mode 100644
index 000000000000..17c885dd7378
--- /dev/null
+++ b/packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/options.json
@@ -0,0 +1,4 @@
+{
+  "targets": "firefox 40",
+  "presets": ["env"]
+}
diff --git a/packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/output.js b/packages/babel-preset-env/test/fixtures/plugins-integration/spread-super-firefox-40/output.js
new file mode 100644
index 000000000000..21dc7642a48e
--- /dev/null
+++ b/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);