Capture stylesheets designated as rel="preload" (#1374)

* feat(Snapshot): Capture stylesheets designated as `rel="preload"`

* fix(Snapshot): Harden asset file extension matching

* Add changeset

* chore: Lint

* Tweak regex, add try-catch block on URL constructor

packages/rrweb-snapshot/src/snapshot.ts

@@ -23,6 +23,7 @@ import {
   stringifyStylesheet,
   getInputType,
   toLowerCase,
+  extractFileExtension,
 } from './utils';
 
 let _id = 1;
@@ -847,7 +848,7 @@ function slimDOMExcluded(
         (sn.tagName === 'link' &&
           sn.attributes.rel === 'prefetch' &&
           typeof sn.attributes.href === 'string' &&
-          sn.attributes.href.endsWith('.js')))
+          extractFileExtension(sn.attributes.href) === 'js'))
     ) {
       return true;
     } else if (
@@ -1177,7 +1178,11 @@ export function serializeNodeWithId(
   if (
     serializedNode.type === NodeType.Element &&
     serializedNode.tagName === 'link' &&
-    serializedNode.attributes.rel === 'stylesheet'
+    typeof serializedNode.attributes.rel === 'string' &&
+    (serializedNode.attributes.rel === 'stylesheet' ||
+      (serializedNode.attributes.rel === 'preload' &&
+        typeof serializedNode.attributes.href === 'string' &&
+        extractFileExtension(serializedNode.attributes.href) === 'css'))
   ) {
     onceStylesheetLoaded(
       n as HTMLLinkElement,