From 2f831c5009b2894ef8750ff3abecea7ae3d54a06 Mon Sep 17 00:00:00 2001
From: John Gunther <gunther@pendo.io>
Date: Mon, 7 Oct 2024 10:53:27 -0400
Subject: [PATCH] Handle exceptions thrown from postcss when calling
 adaptCssForReplay

---
 .changeset/angry-turtles-provide.md          |  5 +++++
 packages/rrweb-snapshot/src/rebuild.ts       | 16 +++++++++++-----
 packages/rrweb-snapshot/test/rebuild.test.ts | 16 +++++++++++++++-
 3 files changed, 31 insertions(+), 6 deletions(-)
 create mode 100644 .changeset/angry-turtles-provide.md

diff --git a/.changeset/angry-turtles-provide.md b/.changeset/angry-turtles-provide.md
new file mode 100644
index 00000000..94750199
--- /dev/null
+++ b/.changeset/angry-turtles-provide.md
@@ -0,0 +1,5 @@
+---
+"rrweb-snapshot": patch
+---
+
+Handle exceptions thrown from postcss when calling adaptCssForReplay
diff --git a/packages/rrweb-snapshot/src/rebuild.ts b/packages/rrweb-snapshot/src/rebuild.ts
index 56f6c4cf..a9dc907a 100644
--- a/packages/rrweb-snapshot/src/rebuild.ts
+++ b/packages/rrweb-snapshot/src/rebuild.ts
@@ -62,11 +62,17 @@ export function adaptCssForReplay(cssText: string, cache: BuildCache): string {
   const cachedStyle = cache?.stylesWithHoverClass.get(cssText);
   if (cachedStyle) return cachedStyle;
 
-  const ast: { css: string } = postcss([
-    mediaSelectorPlugin,
-    pseudoClassPlugin,
-  ]).process(cssText);
-  const result = ast.css;
+  let result = cssText;
+  try {
+    const ast: { css: string } = postcss([
+      mediaSelectorPlugin,
+      pseudoClassPlugin,
+    ]).process(cssText);
+    result = ast.css;
+  } catch (error) {
+    console.warn('Failed to adapt css for replay', error);
+  }
+
   cache?.stylesWithHoverClass.set(cssText, result);
   return result;
 }
diff --git a/packages/rrweb-snapshot/test/rebuild.test.ts b/packages/rrweb-snapshot/test/rebuild.test.ts
index 490b515f..b78c23ec 100644
--- a/packages/rrweb-snapshot/test/rebuild.test.ts
+++ b/packages/rrweb-snapshot/test/rebuild.test.ts
@@ -3,7 +3,7 @@
  */
 import * as fs from 'fs';
 import * as path from 'path';
-import { beforeEach, describe, expect as _expect, it } from 'vitest';
+import { beforeEach, describe, expect as _expect, it, vi } from 'vitest';
 import {
   adaptCssForReplay,
   buildNodeWithSN,
@@ -11,6 +11,7 @@ import {
 } from '../src/rebuild';
 import { NodeType } from '../src/types';
 import { createMirror, Mirror } from '../src/utils';
+import postcss from 'postcss';
 
 const expect = _expect as unknown as {
   <T = unknown>(actual: T): {
@@ -248,4 +249,17 @@ ul li.specified c.\\:hover img {
       should_not_modify,
     );
   });
+
+  it('handles exceptions from postcss when calling adaptCssForReplay', () => {
+    const consoleWarnSpy = vi
+      .spyOn(console, 'warn')
+      .mockImplementation(() => {});
+    // trigger CssSyntaxError by passing invalid css
+    const cssText = 'a{';
+    adaptCssForReplay(cssText, cache);
+    expect(consoleWarnSpy).toHaveBeenLastCalledWith(
+      'Failed to adapt css for replay',
+      expect.any(Error),
+    );
+  });
 });