fix(codegen): do not generate Promise.all (#19182)

Drive-by: fix `download`, `dialog` and `popup` signals to use different
variable names in all languages.

packages/playwright-core/src/server/recorder.ts

@@ -340,8 +340,8 @@ class ContextRecorder extends EventEmitter {
   private _generator: CodeGenerator;
   private _pageAliases = new Map<Page, string>();
   private _lastPopupOrdinal = 0;
-  private _lastDialogOrdinal = 0;
-  private _lastDownloadOrdinal = 0;
+  private _lastDialogOrdinal = -1;
+  private _lastDownloadOrdinal = -1;
   private _timers = new Set<NodeJS.Timeout>();
   private _context: BrowserContext;
   private _params: channels.BrowserContextRecorderSupplementEnableParams;
@@ -647,12 +647,14 @@ class ContextRecorder extends EventEmitter {
 
   private _onDownload(page: Page) {
     const pageAlias = this._pageAliases.get(page)!;
-    this._generator.signal(pageAlias, page.mainFrame(), { name: 'download', downloadAlias: String(++this._lastDownloadOrdinal) });
+    ++this._lastDownloadOrdinal;
+    this._generator.signal(pageAlias, page.mainFrame(), { name: 'download', downloadAlias: this._lastDownloadOrdinal ? String(this._lastDownloadOrdinal) : '' });
   }
 
   private _onDialog(page: Page) {
     const pageAlias = this._pageAliases.get(page)!;
-    this._generator.signal(pageAlias, page.mainFrame(), { name: 'dialog', dialogAlias: String(++this._lastDialogOrdinal) });
+    ++this._lastDialogOrdinal;
+    this._generator.signal(pageAlias, page.mainFrame(), { name: 'dialog', dialogAlias: this._lastDialogOrdinal ? String(this._lastDialogOrdinal) : '' });
   }
 }
 

packages/playwright-core/src/server/recorder/java.ts

@@ -77,7 +77,7 @@ export class JavaLanguageGenerator implements LanguageGenerator {
     }
 
     if (signals.download) {
-      code = `Download download = ${pageAlias}.waitForDownload(() -> {
+      code = `Download download${signals.download.downloadAlias} = ${pageAlias}.waitForDownload(() -> {
         ${code}
       });`;
     }

packages/playwright-core/src/server/recorder/javascript.ts

@@ -74,33 +74,18 @@ export class JavaScriptLanguageGenerator implements LanguageGenerator {
   });`);
     }
 
-    const emitPromiseAll = signals.popup || signals.download;
-    if (emitPromiseAll) {
-      // Generate either await Promise.all([]) or
-      // const [popup1] = await Promise.all([]).
-      let leftHandSide = '';
-      if (signals.popup)
-        leftHandSide = `const [${signals.popup.popupAlias}] = `;
-      else if (signals.download)
-        leftHandSide = `const [download] = `;
-      formatter.add(`${leftHandSide}await Promise.all([`);
-    }
-
-    // Popup signals.
     if (signals.popup)
-      formatter.add(`${pageAlias}.waitForEvent('popup'),`);
-
-    // Download signals.
+      formatter.add(`const ${signals.popup.popupAlias}Promise = ${pageAlias}.waitForEvent('popup');`);
     if (signals.download)
-      formatter.add(`${pageAlias}.waitForEvent('download'),`);
+      formatter.add(`const download${signals.download.downloadAlias}Promise = ${pageAlias}.waitForEvent('download');`);
 
-    const prefix = (signals.popup || signals.download) ? '' : 'await ';
     const actionCall = this._generateActionCall(action);
-    const suffix = emitPromiseAll ? '' : ';';
-    formatter.add(`${prefix}${subject}.${actionCall}${suffix}`);
+    formatter.add(`await ${subject}.${actionCall};`);
 
-    if (emitPromiseAll)
-      formatter.add(`]);`);
+    if (signals.popup)
+      formatter.add(`const ${signals.popup.popupAlias} = await ${signals.popup.popupAlias}Promise;`);
+    if (signals.download)
+      formatter.add(`const download${signals.download.downloadAlias} = await download${signals.download.downloadAlias}Promise;`);
 
     return formatter.format();
   }

packages/playwright-core/src/server/recorder/python.ts

@@ -81,17 +81,17 @@ export class PythonLanguageGenerator implements LanguageGenerator {
     let code = `${this._awaitPrefix}${subject}.${actionCall}`;
 
     if (signals.popup) {
-      code = `${this._asyncPrefix}with ${pageAlias}.expect_popup() as popup_info {
+      code = `${this._asyncPrefix}with ${pageAlias}.expect_popup() as ${signals.popup.popupAlias}_info {
         ${code}
       }
-      ${signals.popup.popupAlias} = ${this._awaitPrefix}popup_info.value`;
+      ${signals.popup.popupAlias} = ${this._awaitPrefix}${signals.popup.popupAlias}_info.value`;
     }
 
     if (signals.download) {
-      code = `${this._asyncPrefix}with ${pageAlias}.expect_download() as download_info {
+      code = `${this._asyncPrefix}with ${pageAlias}.expect_download() as download${signals.download.downloadAlias}_info {
         ${code}
       }
-      download = ${this._awaitPrefix}download_info.value`;
+      download${signals.download.downloadAlias} = ${this._awaitPrefix}download${signals.download.downloadAlias}_info.value`;
     }
 
     formatter.add(code);

tests/library/inspector/cli-codegen-1.spec.ts

@@ -624,10 +624,9 @@ test.describe('cli codegen', () => {
     ]);
 
     expect.soft(sources.get('JavaScript').text).toContain(`
-  const [page1] = await Promise.all([
-    page.waitForEvent('popup'),
-    page.getByRole('link', { name: 'link' }).click()
-  ]);`);
+  const page1Promise = page.waitForEvent('popup');
+  await page.getByRole('link', { name: 'link' }).click();
+  const page1 = await page1Promise;`);
 
     expect.soft(sources.get('Java').text).toContain(`
       Page page1 = page.waitForPopup(() -> {
@@ -635,14 +634,14 @@ test.describe('cli codegen', () => {
       });`);
 
     expect.soft(sources.get('Python').text).toContain(`
-    with page.expect_popup() as popup_info:
+    with page.expect_popup() as page1_info:
         page.get_by_role("link", name="link").click()
-    page1 = popup_info.value`);
+    page1 = page1_info.value`);
 
     expect.soft(sources.get('Python Async').text).toContain(`
-    async with page.expect_popup() as popup_info:
+    async with page.expect_popup() as page1_info:
         await page.get_by_role("link", name="link").click()
-    page1 = await popup_info.value`);
+    page1 = await page1_info.value`);
 
     expect.soft(sources.get('C#').text).toContain(`
         var page1 = await page.RunAndWaitForPopupAsync(async () =>

tests/library/inspector/cli-codegen-2.spec.ts

@@ -222,39 +222,53 @@ test.describe('cli codegen', () => {
       page.waitForEvent('download'),
       page.click('a')
     ]);
-    const sources = await recorder.waitForOutput('JavaScript', 'waitForEvent');
+    await Promise.all([
+      page.waitForEvent('download'),
+      page.click('a')
+    ]);
+    const sources = await recorder.waitForOutput('JavaScript', 'download1Promise');
 
     expect.soft(sources.get('JavaScript').text).toContain(`
-  const context = await browser.newContext();`);
+  const downloadPromise = page.waitForEvent('download');
+  await page.getByRole('link', { name: 'Download' }).click();
+  const download = await downloadPromise;`);
     expect.soft(sources.get('JavaScript').text).toContain(`
-  const [download] = await Promise.all([
-    page.waitForEvent('download'),
-    page.getByRole('link', { name: 'Download' }).click()
-  ]);`);
+  const download1Promise = page.waitForEvent('download');
+  await page.getByRole('link', { name: 'Download' }).click();
+  const download1 = await download1Promise;`);
 
-    expect.soft(sources.get('Java').text).toContain(`
-      BrowserContext context = browser.newContext();`);
     expect.soft(sources.get('Java').text).toContain(`
       Download download = page.waitForDownload(() -> {
         page.getByRole(AriaRole.LINK, new Page.GetByRoleOptions().setName("Download")).click();
       });`);
+    expect.soft(sources.get('Java').text).toContain(`
+      Download download1 = page.waitForDownload(() -> {
+        page.getByRole(AriaRole.LINK, new Page.GetByRoleOptions().setName("Download")).click();
+      });`);
 
-    expect.soft(sources.get('Python').text).toContain(`
-    context = browser.new_context()`);
     expect.soft(sources.get('Python').text).toContain(`
     with page.expect_download() as download_info:
         page.get_by_role("link", name="Download").click()
     download = download_info.value`);
+    expect.soft(sources.get('Python').text).toContain(`
+    with page.expect_download() as download1_info:
+        page.get_by_role("link", name="Download").click()
+    download1 = download1_info.value`);
 
-    expect.soft(sources.get('Python Async').text).toContain(`
-    context = await browser.new_context()`);
     expect.soft(sources.get('Python Async').text).toContain(`
     async with page.expect_download() as download_info:
         await page.get_by_role("link", name="Download").click()
     download = await download_info.value`);
+    expect.soft(sources.get('Python Async').text).toContain(`
+    async with page.expect_download() as download1_info:
+        await page.get_by_role("link", name="Download").click()
+    download1 = await download1_info.value`);
 
     expect.soft(sources.get('C#').text).toContain(`
-        var context = await browser.NewContextAsync();`);
+        var download = await page.RunAndWaitForDownloadAsync(async () =>
+        {
+            await page.GetByRole(AriaRole.Link, new() { Name = "Download" }).ClickAsync();
+        });`);
     expect.soft(sources.get('C#').text).toContain(`
         var download1 = await page.RunAndWaitForDownloadAsync(async () =>
         {
@@ -299,13 +313,13 @@ test.describe('cli codegen', () => {
     await page.get_by_role("button", name="click me").click()`);
 
     expect.soft(sources.get('C#').text).toContain(`
-        void page_Dialog1_EventHandler(object sender, IDialog dialog)
+        void page_Dialog_EventHandler(object sender, IDialog dialog)
         {
             Console.WriteLine($\"Dialog message: {dialog.Message}\");
             dialog.DismissAsync();
-            page.Dialog -= page_Dialog1_EventHandler;
+            page.Dialog -= page_Dialog_EventHandler;
         }
-        page.Dialog += page_Dialog1_EventHandler;
+        page.Dialog += page_Dialog_EventHandler;
         await page.GetByRole(AriaRole.Button, new() { Name = "click me" }).ClickAsync();`);
 
   });
@@ -348,12 +362,11 @@ test.describe('cli codegen', () => {
         await page1.GotoAsync("about:blank?foo");`);
     } else {
       expect(sources.get('JavaScript').text).toContain(`
-  const [page1] = await Promise.all([
-    page.waitForEvent('popup'),
-    page.getByRole('link', { name: 'link' }).click({
-      modifiers: ['${platform === 'darwin' ? 'Meta' : 'Control'}']
-    })
-  ]);`);
+  const page1Promise = page.waitForEvent('popup');
+  await page.getByRole('link', { name: 'link' }).click({
+    modifiers: ['${platform === 'darwin' ? 'Meta' : 'Control'}']
+  });
+  const page1 = await page1Promise;`);
     }
   });