feat(ui): collapse repeating console lines

packages/trace-viewer/src/ui/consoleTab.css

@@ -83,3 +83,18 @@
 .console-line .codicon.status-warning::after {
   background-color: var(--vscode-list-warningForeground);
 }
+
+.console-repeat {
+  display: inline-block;
+  padding: 0 2px;
+  font-size: 12px;
+  font-weight: 500;
+  line-height: 18px;
+  border: 1px solid transparent;
+  border-radius: 0.5em;
+  background-color: #8c959f;
+  color: white;
+  margin-right: 10px;
+  flex: none;
+  font-weight: 600;
+}

packages/trace-viewer/src/ui/consoleTab.tsx

@@ -27,6 +27,7 @@ import { PlaceholderPanel } from './placeholderPanel';
 export type ConsoleEntry = {
   browserMessage?: {
     body: JSX.Element[];
+    bodyString: string;
     location: string;
   },
   browserError?: channels.SerializedError;
@@ -36,6 +37,7 @@ export type ConsoleEntry = {
   isError: boolean;
   isWarning: boolean;
   timestamp: number;
+  repeat: number;
 };
 
 type ConsoleTabModel = {
@@ -50,6 +52,23 @@ export function useConsoleTabModel(model: modelUtil.MultiTraceModel | undefined,
     if (!model)
       return { entries: [] };
     const entries: ConsoleEntry[] = [];
+    function addEntry(entry: Omit<ConsoleEntry, 'repeat'>) {
+      const lastEntry = entries[entries.length - 1];
+      const isSameAsLast =
+        lastEntry
+        && entry.browserMessage?.bodyString === lastEntry.browserMessage?.bodyString
+        && entry.browserMessage?.location === lastEntry.browserMessage?.location
+        && entry.browserError === lastEntry.browserError
+        && entry.nodeMessage?.html === lastEntry.nodeMessage?.html
+        && entry.isError === lastEntry.isError
+        && entry.isWarning === lastEntry.isWarning
+        && entry.timestamp - lastEntry.timestamp < 1000;
+      if (isSameAsLast) {
+        lastEntry.repeat++;
+      } else {
+        entries.push({ ...entry, repeat: 1 });
+      }
+    }
     for (const event of model.events) {
       if (event.type === 'console') {
         const body = event.args && event.args.length ? format(event.args) : formatAnsi(event.text);
@@ -57,9 +76,10 @@ export function useConsoleTabModel(model: modelUtil.MultiTraceModel | undefined,
         const filename = url ? url.substring(url.lastIndexOf('/') + 1) : '<anonymous>';
         const location = `${filename}:${event.location.lineNumber}`;
 
-        entries.push({
+        addEntry({
           browserMessage: {
             body,
+            bodyString: event.text,
             location,
           },
           isError: event.messageType === 'error',
@@ -68,7 +88,7 @@ export function useConsoleTabModel(model: modelUtil.MultiTraceModel | undefined,
         });
       }
       if (event.type === 'event' && event.method === 'pageError') {
-        entries.push({
+        addEntry({
           browserError: event.params.error,
           isError: true,
           isWarning: false,
@@ -83,7 +103,7 @@ export function useConsoleTabModel(model: modelUtil.MultiTraceModel | undefined,
       if (event.base64)
         html = ansi2html(atob(event.base64).trim()) || '';
 
-      entries.push({
+      addEntry({
         nodeMessage: { html },
         isError: event.type === 'stderr',
         isWarning: false,
@@ -154,6 +174,7 @@ export const ConsoleTab: React.FunctionComponent<{
           {timestampElement}
           {statusElement}
           {locationText && <span className='console-location'>{locationText}</span>}
+          {entry.repeat > 1 && <span className='console-repeat'>{entry.repeat}</span>}
           {messageBody && <span className='console-line-message'>{messageBody}</span>}
           {messageInnerHTML && <span className='console-line-message' dangerouslySetInnerHTML={{ __html: messageInnerHTML }}></span>}
           {messageStack && <div className='console-stack'>{messageStack}</div>}

tests/playwright-test/ui-mode-test-output.spec.ts

@@ -114,6 +114,45 @@ test('should show console messages for test', async ({ runUITest }, testInfo) =>
   await expect.soft(page.getByText('GREEN', { exact: true })).toHaveCSS('color', 'rgb(0, 188, 0)');
 });
 
+test('should collapse repeated console messages for test', async ({ runUITest }) => {
+  const { page } = await runUITest({
+    'a.spec.ts': `
+      import { test, expect } from '@playwright/test';
+      test('print', async ({ page }) => {
+        await page.evaluate(() => {
+          for (let i = 0; i < 10; ++i)
+            console.log('page message')
+        });
+        for (let i = 0; i < 10; ++i)
+          console.log('node message')
+        await page.evaluate(async () => {
+          await new Promise(resolve => {
+            for (let i = 0; i < 10; ++i)
+              console.log('page message')
+            setTimeout(() => {
+              for (let i = 0; i < 10; ++i)
+                console.log('page message')
+              resolve()
+            }, 1500)
+          })
+        });
+      });
+    `,
+  });
+  await page.getByTitle('Run all').click();
+  await page.getByRole('tab', { name: 'Console' }).click();
+  await page.getByText('print').click();
+
+  await expect(page.getByRole('tabpanel', { name: 'Console' })).toMatchAriaSnapshot(`
+    - tabpanel "Console":
+      - list:
+        - listitem: /10 page message/
+        - listitem: /10 node message/
+        - listitem: /10 page message/
+        - listitem: /10 page message/
+  `);
+});
+
 test('should format console messages in page', async ({ runUITest }, testInfo) => {
   const { page } = await runUITest({
     'a.spec.ts': `