From 95dd144227417039eb02c59f2bb884b98d0e7d54 Mon Sep 17 00:00:00 2001
From: Justin Halsall <Juice10@users.noreply.github.com>
Date: Wed, 1 Apr 2026 12:00:00 +0800
Subject: [PATCH] child nodes without __sn now remove without error (#307)

---
 src/utils.ts          |  8 ++--
 test/replayer.test.ts | 24 +++++++++--
 test/utils.ts         | 96 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 121 insertions(+), 7 deletions(-)

diff --git a/src/utils.ts b/src/utils.ts
index e97612c2..2859ce4c 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -307,9 +307,11 @@ export class TreeIndex {
     const deepRemoveFromMirror = (id: number) => {
       this.removeIdSet.add(id);
       const node = mirror.getNode(id);
-      node?.childNodes.forEach((childNode) =>
-        deepRemoveFromMirror(((childNode as unknown) as INode).__sn.id),
-      );
+      node?.childNodes.forEach((childNode) => {
+        if ('__sn' in childNode) {
+          deepRemoveFromMirror(((childNode as unknown) as INode).__sn.id)
+        }
+      });
     };
     const deepRemoveFromTreeIndex = (node: TreeNode) => {
       this.removeIdSet.add(node.id);
diff --git a/test/replayer.test.ts b/test/replayer.test.ts
index 731bd9c4..97fec985 100644
--- a/test/replayer.test.ts
+++ b/test/replayer.test.ts
@@ -5,8 +5,11 @@ import * as path from 'path';
 import * as puppeteer from 'puppeteer';
 import { expect } from 'chai';
 import { Suite } from 'mocha';
-import { launchPuppeteer, sampleEvents as events } from './utils';
-import { EventType } from '../src/types';
+import {
+  launchPuppeteer,
+  sampleEvents as events,
+  sampleStyleSheetRemoveEvents as stylesheetRemoveEvents
+} from './utils';
 
 interface ISuite extends Suite {
   code: string;
@@ -28,7 +31,7 @@ describe('replayer', function (this: ISuite) {
     const page: puppeteer.Page = await this.browser.newPage();
     await page.goto('about:blank');
     await page.evaluate(this.code);
-    await page.evaluate(`const events = ${JSON.stringify(events)}`);
+    await page.evaluate(`let events = ${JSON.stringify(events)}`);
     this.page = page;
 
     page.on('console', (msg) => console.log('PAGE LOG:', msg.text()));
@@ -132,6 +135,19 @@ describe('replayer', function (this: ISuite) {
     expect(currentState).to.equal('paused');
   });
 
+  it('can handle removing style elements', async () => {
+    await this.page.evaluate(`events = ${JSON.stringify(stylesheetRemoveEvents)}`);
+    const actionLength = await this.page.evaluate(`
+      const { Replayer } = rrweb;
+      const replayer = new Replayer(events);
+      replayer.play(2500);
+      replayer['timer']['actions'].length;
+    `);
+    expect(actionLength).to.equal(
+      stylesheetRemoveEvents.filter((e) => e.timestamp - stylesheetRemoveEvents[0].timestamp >= 2500).length,
+    );
+  });
+
   it('can stream events in live mode', async () => {
     const status = await this.page.evaluate(`
       const { Replayer } = rrweb;
@@ -142,5 +158,5 @@ describe('replayer', function (this: ISuite) {
       replayer.service.state.value;
     `);
     expect(status).to.equal('live');
-  })
+  });
 });
diff --git a/test/utils.ts b/test/utils.ts
index 2372e2ba..0776b963 100644
--- a/test/utils.ts
+++ b/test/utils.ts
@@ -202,3 +202,99 @@ export const sampleEvents: eventWithTime[] = [
     timestamp: now + 4000,
   },
 ];
+
+export const sampleStyleSheetRemoveEvents: eventWithTime[] = [
+  {
+    type: EventType.DomContentLoaded,
+    data: {},
+    timestamp: now,
+  },
+  {
+    type: EventType.Load,
+    data: {},
+    timestamp: now + 1000,
+  },
+  {
+    type: EventType.Meta,
+    data: {
+      href: 'http://localhost',
+      width: 1000,
+      height: 800,
+    },
+    timestamp: now + 1000,
+  },
+  {
+    type: EventType.FullSnapshot,
+    data: {
+      node: {
+        type: 0,
+        childNodes: [
+          {
+            type: 2,
+            tagName: 'html',
+            attributes: {},
+            childNodes: [
+              {
+                type: 2,
+                tagName: 'head',
+                attributes: {},
+                childNodes: [
+                  {
+                    type: 2,
+                    tagName: "style",
+                    attributes: {
+                      "data-jss": "",
+                      "data-meta": "OverlayDrawer",
+                      _cssText: ".OverlayDrawer-modal-187 { }.OverlayDrawer-paper-188 { width: 100%; }@media (min-width: 48em) {\n  .OverlayDrawer-paper-188 { width: 38rem; }\n}@media (min-width: 48em) {\n}@media (min-width: 48em) {\n}"
+                    },
+                    childNodes: [
+                      {
+                        type: 3,
+                        textContent: "\n",
+                        isStyle: true,
+                        id: 5
+                      },
+                    ],
+                    id: 4
+                  },
+
+                ],
+                id: 3,
+              },
+              {
+                type: 2,
+                tagName: 'body',
+                attributes: {},
+                childNodes: [],
+                id: 6,
+              },
+            ],
+            id: 2,
+          },
+        ],
+        id: 1,
+      },
+      initialOffset: {
+        top: 0,
+        left: 0,
+      },
+    },
+    timestamp: now + 1000,
+  },
+  {
+    type: EventType.IncrementalSnapshot,
+    data: {
+      source: IncrementalSource.Mutation,
+      texts: [],
+      attributes: [],
+      removes: [
+        {
+          parentId: 3,
+          id: 4
+        }
+      ],
+      adds: []
+    },
+    timestamp: now + 2000,
+  },
+];