From 7f96331192f0b7422e5dba96f964d32a0879248e Mon Sep 17 00:00:00 2001
From: Michael Dellanoce <mdellanoce@pendo.io>
Date: Fri, 2 Feb 2024 15:51:28 -0500
Subject: [PATCH] Replace Array.from with clean implementation

This work is to try to provide support where rrweb might be included
in applications with various tools that might override Array.from
so that the 2nd parameter (the map function) will always work for
rrweb.
---
 .changeset/eleven-bobcats-peel.md  |  6 ++++++
 packages/rrweb/src/record/index.ts | 14 ++++++++++++++
 packages/rrweb/src/types.ts        |  1 +
 3 files changed, 21 insertions(+)
 create mode 100644 .changeset/eleven-bobcats-peel.md

diff --git a/.changeset/eleven-bobcats-peel.md b/.changeset/eleven-bobcats-peel.md
new file mode 100644
index 0000000000..75f7263e1f
--- /dev/null
+++ b/.changeset/eleven-bobcats-peel.md
@@ -0,0 +1,6 @@
+---
+'rrweb-snapshot': patch
+'rrweb': patch
+---
+
+better support for coexistence with older libraries (e.g. MooTools & Prototype.js) which modify the in-built `Array.from` function
diff --git a/packages/rrweb/src/record/index.ts b/packages/rrweb/src/record/index.ts
index 7be978199d..484a8a7ecb 100644
--- a/packages/rrweb/src/record/index.ts
+++ b/packages/rrweb/src/record/index.ts
@@ -46,6 +46,20 @@ let takeFullSnapshot!: (isCheckout?: boolean) => void;
 let canvasManager!: CanvasManager;
 let recording = false;
 
+// Multiple tools (i.e. MooTools, Prototype.js) override Array.from and drop support for the 2nd parameter
+// Try to pull a clean implementation from a newly created iframe
+try {
+  if (Array.from([1], (x) => x * 2)[0] !== 2) {
+    const cleanFrame = document.createElement('iframe');
+    document.body.appendChild(cleanFrame);
+    // eslint-disable-next-line @typescript-eslint/unbound-method -- Array.from is static and doesn't rely on binding
+    Array.from = cleanFrame.contentWindow?.Array.from || Array.from;
+    document.body.removeChild(cleanFrame);
+  }
+} catch (err) {
+  console.debug('Unable to override Array.from', err);
+}
+
 const mirror = createMirror();
 function record<T = eventWithTime>(
   options: recordOptions<T> = {},
diff --git a/packages/rrweb/src/types.ts b/packages/rrweb/src/types.ts
index 10ffb62b43..03c9a59fdc 100644
--- a/packages/rrweb/src/types.ts
+++ b/packages/rrweb/src/types.ts
@@ -207,6 +207,7 @@ export type missingNodeMap = {
 declare global {
   interface Window {
     FontFace: typeof FontFace;
+    Array: typeof Array;
   }
 }