1 files changed, 75 insertions, 0 deletions
diff --git a/browser/extensions/webcompat/shims/fastclick.js b/browser/extensions/webcompat/shims/fastclick.js
new file mode 100644
index 0000000000..ad6814c995
--- /dev/null
+++ b/browser/extensions/webcompat/shims/fastclick.js
@@ -0,0 +1,75 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * Bug 1738220 - Shim Conversant FastClick
+ *
+ * Sites assuming FastClick will load can break if it is blocked.
+ * This shim mitigates that breakage.
+ */
+
+// FastClick bundles nodeJS packages/core-js/internals/dom-iterables.js
+// which is known to be needed by at least one site.
+if (!HTMLCollection.prototype.forEach) {
+  const DOMIterables = [
+    "CSSRuleList",
+    "CSSStyleDeclaration",
+    "CSSValueList",
+    "ClientRectList",
+    "DOMRectList",
+    "DOMStringList",
+    "DOMTokenList",
+    "DataTransferItemList",
+    "FileList",
+    "HTMLAllCollection",
+    "HTMLCollection",
+    "HTMLFormElement",
+    "HTMLSelectElement",
+    "MediaList",
+    "MimeTypeArray",
+    "NamedNodeMap",
+    "NodeList",
+    "PaintRequestList",
+    "Plugin",
+    "PluginArray",
+    "SVGLengthList",
+    "SVGNumberList",
+    "SVGPathSegList",
+    "SVGPointList",
+    "SVGStringList",
+    "SVGTransformList",
+    "SourceBufferList",
+    "StyleSheetList",
+    "TextTrackCueList",
+    "TextTrackList",
+    "TouchList",
+  ];
+
+  const forEach = Array.prototype.forEach;
+
+  const handlePrototype = proto => {
+    if (!proto || proto.forEach === forEach) {
+      return;
+    }
+    try {
+      Object.defineProperty(proto, "forEach", {
+        enumerable: false,
+        get: () => forEach,
+      });
+    } catch (_) {
+      proto.forEach = forEach;
+    }
+  };
+
+  for (const name of DOMIterables) {
+    handlePrototype(window[name]?.prototype);
+  }
+}
+
+if (!window.conversant?.launch) {
+  const c = (window.conversant = window.conversant || {});
+  c.launch = () => {};
+}