From 711a7cbbaadfd78387999ab3ea14e2b2eab75f59 Mon Sep 17 00:00:00 2001
From: Colin Maxfield <colinmaxfield@gmail.com>
Date: Wed, 1 Apr 2026 12:00:00 +0800
Subject: [PATCH] Replace Array.from with clean implementation (#1464)

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.

Co-authored-by: Michael Dellanoce <mdellanoce@pendo.io>
---
 .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 00000000..75f7263e
--- /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 7be97819..484a8a7e 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 10ffb62b..03c9a59f 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;
   }
 }