feat: increase mobile devices emulate

src/tools/ToolDefinition.ts

@@ -4,12 +4,12 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import type {Dialog, ElementHandle, Page} from 'puppeteer-core';
+import type { Dialog, ElementHandle, Page } from 'puppeteer-core';
 import type z from 'zod';
 
-import type {TraceResult} from '../trace-processing/parse.js';
+import type { TraceResult } from '../trace-processing/parse.js';
 
-import type {ToolCategories} from './categories.js';
+import type { ToolCategories } from './categories.js';
 
 export interface ToolDefinition<Schema extends z.ZodRawShape = z.ZodRawShape> {
   name: string;
@@ -44,7 +44,7 @@ export interface Response {
   setIncludePages(value: boolean): void;
   setIncludeNetworkRequests(
     value: boolean,
-    options?: {pageSize?: number; pageIdx?: number; resourceTypes?: string[]},
+    options?: { pageSize?: number; pageIdx?: number; resourceTypes?: string[] },
   ): void;
   setIncludeConsoleData(value: boolean): void;
   setIncludeSnapshot(value: boolean): void;
@@ -73,8 +73,11 @@ export type Context = Readonly<{
   saveTemporaryFile(
     data: Uint8Array<ArrayBufferLike>,
     mimeType: 'image/png' | 'image/jpeg',
-  ): Promise<{filename: string}>;
+  ): Promise<{ filename: string }>;
   waitForEventsAfterAction(action: () => Promise<unknown>): Promise<void>;
+  // Added for multi-page device emulation support
+  createPagesSnapshot(): Promise<Page[]>;
+  getPages(): Page[];
 }>;
 
 export function defineTool<Schema extends z.ZodRawShape>(

src/tools/emulation.ts

@@ -4,17 +4,47 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import {PredefinedNetworkConditions} from 'puppeteer-core';
+import { PredefinedNetworkConditions } from 'puppeteer-core';
+import { KnownDevices } from 'puppeteer-core';
 import z from 'zod';
 
-import {ToolCategories} from './categories.js';
-import {defineTool} from './ToolDefinition.js';
+import { ToolCategories } from './categories.js';
+import { defineTool } from './ToolDefinition.js';
 
 const throttlingOptions: [string, ...string[]] = [
   'No emulation',
   ...Object.keys(PredefinedNetworkConditions),
 ];
 
+// common use device
+const deviceOptions: [string, ...string[]] = [
+  'No emulation',
+  // iPhone series
+  'iPhone SE',
+  'iPhone 12',
+  'iPhone 12 Pro',
+  'iPhone 13',
+  'iPhone 13 Pro',
+  'iPhone 14',
+  'iPhone 14 Pro',
+  'iPhone 15',
+  'iPhone 15 Pro',
+  // Android series
+  'Galaxy S5',
+  'Galaxy S8',
+  'Galaxy S9+',
+  'Pixel 2',
+  'Pixel 3',
+  'Pixel 4',
+  'Pixel 5',
+  'Nexus 5',
+  'Nexus 6P',
+  // ipad
+  'iPad',
+  'iPad Pro',
+  'Galaxy Tab S4',
+];
+
 export const emulateNetwork = defineTool({
   name: 'emulate_network',
   description: `Emulates network conditions such as throttling on the selected page.`,
@@ -42,7 +72,7 @@ export const emulateNetwork = defineTool({
     if (conditions in PredefinedNetworkConditions) {
       const networkCondition =
         PredefinedNetworkConditions[
-          conditions as keyof typeof PredefinedNetworkConditions
+        conditions as keyof typeof PredefinedNetworkConditions
         ];
       await page.emulateNetworkConditions(networkCondition);
       context.setNetworkConditions(conditions);
@@ -68,9 +98,124 @@ export const emulateCpu = defineTool({
   },
   handler: async (request, _response, context) => {
     const page = context.getSelectedPage();
-    const {throttlingRate} = request.params;
+    const { throttlingRate } = request.params;
 
     await page.emulateCPUThrottling(throttlingRate);
     context.setCpuThrottlingRate(throttlingRate);
   },
 });
+
+export const emulateDevice = defineTool({
+  name: 'emulate_device',
+  description: `IMPORTANT: Emulates a mobile device including viewport, user-agent, touch support, and device scale factor. This tool MUST be called BEFORE navigating to any website to ensure the correct mobile user-agent is used. Essential for testing mobile website performance and user experience.`,
+  annotations: {
+    category: ToolCategories.EMULATION,
+    readOnlyHint: false,
+  },
+  schema: {
+    device: z
+      .enum(deviceOptions)
+      .describe(
+        `The device to emulate. Available devices are: ${deviceOptions.join(', ')}. Set to "No emulation" to disable device emulation and use desktop mode.`,
+      ),
+    customUserAgent: z
+      .string()
+      .optional()
+      .describe(
+        'Optional custom user agent string. If provided, it will override the device\'s default user agent.',
+      ),
+  },
+  handler: async (request, response, context) => {
+    const { device, customUserAgent } = request.params;
+
+    // get all pages to support multi-page scene 
+    await context.createPagesSnapshot();
+    const allPages = context.getPages();
+    const currentPage = context.getSelectedPage();
+
+    // check if multi pages and apply to all pages
+    let pagesToEmulate = [currentPage];
+    let multiPageMessage = '';
+
+    if (allPages.length > 1) {
+      // check if other pages have navigated content (maybe new tab page)
+      const navigatedPages = [];
+      for (const page of allPages) {
+        const url = page.url();
+        if (url !== 'about:blank' && url !== currentPage.url()) {
+          navigatedPages.push({ page, url });
+        }
+      }
+
+      if (navigatedPages.length > 0) {
+        // found other pages have navigated, apply device emulation to all pages
+        pagesToEmulate = [currentPage, ...navigatedPages.map(p => p.page)];
+        multiPageMessage = `🔄 SMART MULTI-PAGE MODE: Detected ${navigatedPages.length} additional page(s) with content. ` +
+          `Applying device emulation to current page and ${navigatedPages.length} other page(s): ` +
+          `${navigatedPages.map(p => p.url).join(', ')}. `;
+      }
+    }
+
+    // check if current page has navigated
+    const currentUrl = currentPage.url();
+    if (currentUrl !== 'about:blank') {
+      response.appendResponseLine(
+        `⚠️  WARNING: Device emulation is being applied AFTER page navigation (current URL: ${currentUrl}). ` +
+        `For best results, device emulation should be set BEFORE navigating to the target website.`
+      );
+    }
+
+    if (multiPageMessage) {
+      response.appendResponseLine(multiPageMessage);
+    }
+
+    if (device === 'No emulation') {
+      // apply desktop mode to all pages
+      for (const pageToEmulate of pagesToEmulate) {
+        await pageToEmulate.setViewport({
+          width: 1920,
+          height: 1080,
+          deviceScaleFactor: 1,
+          isMobile: false,
+          hasTouch: false,
+          isLandscape: true,
+        });
+
+        await pageToEmulate.setUserAgent(
+          customUserAgent ||
+          'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36'
+        );
+      }
+
+      response.appendResponseLine(
+        `Device emulation disabled. Desktop mode applied to ${pagesToEmulate.length} page(s).`
+      );
+      return;
+    }
+
+    // check if current device is in KnownDevices
+    if (device in KnownDevices) {
+      const deviceConfig = KnownDevices[device as keyof typeof KnownDevices];
+
+      // apply device config to all page
+      for (const pageToEmulate of pagesToEmulate) {
+        await pageToEmulate.emulate({
+          userAgent: customUserAgent || deviceConfig.userAgent,
+          viewport: deviceConfig.viewport,
+        });
+      }
+
+      response.appendResponseLine(
+        `Successfully emulated device: ${device} on ${pagesToEmulate.length} page(s). ` +
+        `Viewport: ${deviceConfig.viewport.width}x${deviceConfig.viewport.height}, ` +
+        `Scale: ${deviceConfig.viewport.deviceScaleFactor}x, ` +
+        `Mobile: ${deviceConfig.viewport.isMobile ? 'Yes' : 'No'}, ` +
+        `Touch: ${deviceConfig.viewport.hasTouch ? 'Yes' : 'No'}${customUserAgent ? ', Custom UA applied' : ''}.`
+      );
+    } else {
+      response.appendResponseLine(
+        `Device "${device}" not found in known devices. Available devices: ${deviceOptions.filter(d => d !== 'No emulation').join(', ')}`
+      );
+    }
+  },
+});