Demonstrate that rrweb-io#1374 caused stylesheet contents to be captu…

…red twice after a mutation to rel="stylesheet" from rel="preload"
eoghanmurray · May 22, 2024 · 5314122 · 5314122
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diff --git a/packages/rrweb/test/__snapshots__/record.test.ts.snap b/packages/rrweb/test/__snapshots__/record.test.ts.snap
@@ -3254,6 +3254,223 @@ exports[`record loading stylesheets captures stylesheets in iframes that are sti
 ]"
 `;
 
+exports[`record loading stylesheets captures stylesheets that are preloaded 1`] = `
+"[
+  {
+    \\"type\\": 4,
+    \\"data\\": {
+      \\"href\\": \\"about:blank\\",
+      \\"width\\": 1920,
+      \\"height\\": 1080
+    }
+  },
+  {
+    \\"type\\": 2,
+    \\"data\\": {
+      \\"node\\": {
+        \\"type\\": 0,
+        \\"childNodes\\": [
+          {
+            \\"type\\": 1,
+            \\"name\\": \\"html\\",
+            \\"publicId\\": \\"\\",
+            \\"systemId\\": \\"\\",
+            \\"id\\": 2
+          },
+          {
+            \\"type\\": 2,
+            \\"tagName\\": \\"html\\",
+            \\"attributes\\": {
+              \\"lang\\": \\"en\\"
+            },
+            \\"childNodes\\": [
+              {
+                \\"type\\": 2,
+                \\"tagName\\": \\"head\\",
+                \\"attributes\\": {},
+                \\"childNodes\\": [
+                  {
+                    \\"type\\": 3,
+                    \\"textContent\\": \\"\\\\n    \\",
+                    \\"id\\": 5
+                  },
+                  {
+                    \\"type\\": 2,
+                    \\"tagName\\": \\"meta\\",
+                    \\"attributes\\": {
+                      \\"charset\\": \\"UTF-8\\"
+                    },
+                    \\"childNodes\\": [],
+                    \\"id\\": 6
+                  },
+                  {
+                    \\"type\\": 3,
+                    \\"textContent\\": \\"\\\\n    \\",
+                    \\"id\\": 7
+                  },
+                  {
+                    \\"type\\": 2,
+                    \\"tagName\\": \\"meta\\",
+                    \\"attributes\\": {
+                      \\"http-equiv\\": \\"X-UA-Compatible\\",
+                      \\"content\\": \\"IE=edge\\"
+                    },
+                    \\"childNodes\\": [],
+                    \\"id\\": 8
+                  },
+                  {
+                    \\"type\\": 3,
+                    \\"textContent\\": \\"\\\\n    \\",
+                    \\"id\\": 9
+                  },
+                  {
+                    \\"type\\": 2,
+                    \\"tagName\\": \\"meta\\",
+                    \\"attributes\\": {
+                      \\"name\\": \\"viewport\\",
+                      \\"content\\": \\"width=device-width, initial-scale=1.0\\"
+                    },
+                    \\"childNodes\\": [],
+                    \\"id\\": 10
+                  },
+                  {
+                    \\"type\\": 3,
+                    \\"textContent\\": \\"\\\\n    \\",
+                    \\"id\\": 11
+                  },
+                  {
+                    \\"type\\": 2,
+                    \\"tagName\\": \\"title\\",
+                    \\"attributes\\": {},
+                    \\"childNodes\\": [
+                      {
+                        \\"type\\": 3,
+                        \\"textContent\\": \\"Hello World!\\",
+                        \\"id\\": 13
+                      }
+                    ],
+                    \\"id\\": 12
+                  },
+                  {
+                    \\"type\\": 3,
+                    \\"textContent\\": \\"\\\\n  \\",
+                    \\"id\\": 14
+                  }
+                ],
+                \\"id\\": 4
+              },
+              {
+                \\"type\\": 3,
+                \\"textContent\\": \\"\\\\n  \\",
+                \\"id\\": 15
+              },
+              {
+                \\"type\\": 2,
+                \\"tagName\\": \\"body\\",
+                \\"attributes\\": {},
+                \\"childNodes\\": [
+                  {
+                    \\"type\\": 3,
+                    \\"textContent\\": \\"\\\\n    Hello world!\\\\n  \\\\n\\\\n\\",
+                    \\"id\\": 17
+                  }
+                ],
+                \\"id\\": 16
+              }
+            ],
+            \\"id\\": 3
+          }
+        ],
+        \\"id\\": 1
+      },
+      \\"initialOffset\\": {
+        \\"left\\": 0,
+        \\"top\\": 0
+      }
+    }
+  },
+  {
+    \\"type\\": 3,
+    \\"data\\": {
+      \\"source\\": 0,
+      \\"texts\\": [],
+      \\"attributes\\": [],
+      \\"removes\\": [],
+      \\"adds\\": [
+        {
+          \\"parentId\\": 4,
+          \\"nextId\\": null,
+          \\"node\\": {
+            \\"type\\": 2,
+            \\"tagName\\": \\"link\\",
+            \\"attributes\\": {
+              \\"rel\\": \\"preload\\",
+              \\"as\\": \\"style\\",
+              \\"href\\": \\"http://localhost:3030/html/assets/style.css\\"
+            },
+            \\"childNodes\\": [],
+            \\"id\\": 18
+          }
+        }
+      ]
+    }
+  },
+  {
+    \\"type\\": 3,
+    \\"data\\": {
+      \\"source\\": 0,
+      \\"texts\\": [],
+      \\"attributes\\": [
+        {
+          \\"id\\": 18,
+          \\"attributes\\": {
+            \\"rel\\": \\"stylesheet\\"
+          }
+        }
+      ],
+      \\"removes\\": [],
+      \\"adds\\": []
+    }
+  },
+  {
+    \\"type\\": 3,
+    \\"data\\": {
+      \\"source\\": 0,
+      \\"adds\\": [],
+      \\"removes\\": [],
+      \\"texts\\": [],
+      \\"attributes\\": [
+        {
+          \\"id\\": 18,
+          \\"attributes\\": {
+            \\"as\\": \\"style\\",
+            \\"_cssText\\": \\"body { color: pink; }\\"
+          }
+        }
+      ]
+    }
+  },
+  {
+    \\"type\\": 3,
+    \\"data\\": {
+      \\"source\\": 0,
+      \\"adds\\": [],
+      \\"removes\\": [],
+      \\"texts\\": [],
+      \\"attributes\\": [
+        {
+          \\"id\\": 18,
+          \\"attributes\\": {
+            \\"as\\": \\"style\\",
+            \\"_cssText\\": \\"body { color: pink; }\\"
+          }
+        }
+      ]
+    }
+  }
+]"
+`;
+
 exports[`record loading stylesheets captures stylesheets that are still loading 1`] = `
 "[
   {

diff --git a/packages/rrweb/test/record.test.ts b/packages/rrweb/test/record.test.ts
@@ -769,6 +769,31 @@ describe('record', function (this: ISuite) {
       await server.close();
     });
 
+    it('captures stylesheets that are preloaded', async () => {
+      ctx.page.evaluate((serverURL) => {
+        const { record } = (window as unknown as IWindow).rrweb;
+
+        record({
+          inlineStylesheet: true,
+          emit: (window as unknown as IWindow).emit,
+        });
+
+        const link1 = document.createElement('link');
+        link1.setAttribute('rel', 'preload');
+        link1.setAttribute('as', 'style');
+        link1.setAttribute('href', `${serverURL}/html/assets/style.css`);
+        link1.addEventListener('load', () => {
+          link1.setAttribute('rel', 'stylesheet');
+        });
+        document.head.appendChild(link1);
+      }, serverURL);
+
+      await ctx.page.waitForResponse(`${serverURL}/html/assets/style.css`);
+      await waitForRAF(ctx.page);
+
+      assertSnapshot(ctx.events);
+    });
+
     it('captures stylesheets that are still loading', async () => {
       ctx.page.evaluate((serverURL) => {
         const { record } = (window as unknown as IWindow).rrweb;