Join the 1-day Testing & QA Summit featuring 15+ Expert Speakers.Register for FREE! 
How to use mountDebugValue method in Playwright Internal
Best JavaScript code snippet using playwright-internal
ReactFiberHooks.js
Source:ReactFiberHooks.js 
...1207 },1208 useDebugValue<T>(value: T, formatterFn: ?(value: T) => mixed): void {1209 currentHookNameInDev = 'useDebugValue';1210 mountHookTypesDev();1211 return mountDebugValue(value, formatterFn);1212 },1213 };1214 HooksDispatcherOnMountWithHookTypesInDEV = {1215 readContext<T>(1216 context: ReactContext<T>,1217 observedBits: void | number | boolean,1218 ): T {1219 return readContext(context, observedBits);1220 },1221 useCallback<T>(callback: T, deps: Array<mixed> | void | null): T {1222 currentHookNameInDev = 'useCallback';1223 updateHookTypesDev();1224 return mountCallback(callback, deps);1225 },1226 useContext<T>(1227 context: ReactContext<T>,1228 observedBits: void | number | boolean,1229 ): T {1230 currentHookNameInDev = 'useContext';1231 updateHookTypesDev();1232 return readContext(context, observedBits);1233 },1234 useEffect(1235 create: () => (() => void) | void,1236 deps: Array<mixed> | void | null,1237 ): void {1238 currentHookNameInDev = 'useEffect';1239 updateHookTypesDev();1240 return mountEffect(create, deps);1241 },1242 useImperativeHandle<T>(1243 ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,1244 create: () => T,1245 deps: Array<mixed> | void | null,1246 ): void {1247 currentHookNameInDev = 'useImperativeHandle';1248 updateHookTypesDev();1249 return mountImperativeHandle(ref, create, deps);1250 },1251 useLayoutEffect(1252 create: () => (() => void) | void,1253 deps: Array<mixed> | void | null,1254 ): void {1255 currentHookNameInDev = 'useLayoutEffect';1256 updateHookTypesDev();1257 return mountLayoutEffect(create, deps);1258 },1259 useMemo<T>(create: () => T, deps: Array<mixed> | void | null): T {1260 currentHookNameInDev = 'useMemo';1261 updateHookTypesDev();1262 const prevDispatcher = ReactCurrentDispatcher.current;1263 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1264 try {1265 return mountMemo(create, deps);1266 } finally {1267 ReactCurrentDispatcher.current = prevDispatcher;1268 }1269 },1270 useReducer<S, I, A>(1271 reducer: (S, A) => S,1272 initialArg: I,1273 init?: I => S,1274 ): [S, Dispatch<A>] {1275 currentHookNameInDev = 'useReducer';1276 updateHookTypesDev();1277 const prevDispatcher = ReactCurrentDispatcher.current;1278 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1279 try {1280 return mountReducer(reducer, initialArg, init);1281 } finally {1282 ReactCurrentDispatcher.current = prevDispatcher;1283 }1284 },1285 useRef<T>(initialValue: T): {current: T} {1286 currentHookNameInDev = 'useRef';1287 updateHookTypesDev();1288 return mountRef(initialValue);1289 },1290 useState<S>(1291 initialState: (() => S) | S,1292 ): [S, Dispatch<BasicStateAction<S>>] {1293 currentHookNameInDev = 'useState';1294 updateHookTypesDev();1295 const prevDispatcher = ReactCurrentDispatcher.current;1296 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1297 try {1298 return mountState(initialState);1299 } finally {1300 ReactCurrentDispatcher.current = prevDispatcher;1301 }1302 },1303 useDebugValue<T>(value: T, formatterFn: ?(value: T) => mixed): void {1304 currentHookNameInDev = 'useDebugValue';1305 updateHookTypesDev();1306 return mountDebugValue(value, formatterFn);1307 },1308 };1309 HooksDispatcherOnUpdateInDEV = {1310 readContext<T>(1311 context: ReactContext<T>,1312 observedBits: void | number | boolean,1313 ): T {1314 return readContext(context, observedBits);1315 },1316 useCallback<T>(callback: T, deps: Array<mixed> | void | null): T {1317 currentHookNameInDev = 'useCallback';1318 updateHookTypesDev();1319 return updateCallback(callback, deps);1320 },1321 useContext<T>(1322 context: ReactContext<T>,1323 observedBits: void | number | boolean,1324 ): T {1325 currentHookNameInDev = 'useContext';1326 updateHookTypesDev();1327 return readContext(context, observedBits);1328 },1329 useEffect(1330 create: () => (() => void) | void,1331 deps: Array<mixed> | void | null,1332 ): void {1333 currentHookNameInDev = 'useEffect';1334 updateHookTypesDev();1335 return updateEffect(create, deps);1336 },1337 useImperativeHandle<T>(1338 ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,1339 create: () => T,1340 deps: Array<mixed> | void | null,1341 ): void {1342 currentHookNameInDev = 'useImperativeHandle';1343 updateHookTypesDev();1344 return updateImperativeHandle(ref, create, deps);1345 },1346 useLayoutEffect(1347 create: () => (() => void) | void,1348 deps: Array<mixed> | void | null,1349 ): void {1350 currentHookNameInDev = 'useLayoutEffect';1351 updateHookTypesDev();1352 return updateLayoutEffect(create, deps);1353 },1354 useMemo<T>(create: () => T, deps: Array<mixed> | void | null): T {1355 currentHookNameInDev = 'useMemo';1356 updateHookTypesDev();1357 const prevDispatcher = ReactCurrentDispatcher.current;1358 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnUpdateInDEV;1359 try {1360 return updateMemo(create, deps);1361 } finally {1362 ReactCurrentDispatcher.current = prevDispatcher;1363 }1364 },1365 useReducer<S, I, A>(1366 reducer: (S, A) => S,1367 initialArg: I,1368 init?: I => S,1369 ): [S, Dispatch<A>] {1370 currentHookNameInDev = 'useReducer';1371 updateHookTypesDev();1372 const prevDispatcher = ReactCurrentDispatcher.current;1373 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnUpdateInDEV;1374 try {1375 return updateReducer(reducer, initialArg, init);1376 } finally {1377 ReactCurrentDispatcher.current = prevDispatcher;1378 }1379 },1380 useRef<T>(initialValue: T): {current: T} {1381 currentHookNameInDev = 'useRef';1382 updateHookTypesDev();1383 return updateRef(initialValue);1384 },1385 useState<S>(1386 initialState: (() => S) | S,1387 ): [S, Dispatch<BasicStateAction<S>>] {1388 currentHookNameInDev = 'useState';1389 updateHookTypesDev();1390 const prevDispatcher = ReactCurrentDispatcher.current;1391 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnUpdateInDEV;1392 try {1393 return updateState(initialState);1394 } finally {1395 ReactCurrentDispatcher.current = prevDispatcher;1396 }1397 },1398 useDebugValue<T>(value: T, formatterFn: ?(value: T) => mixed): void {1399 currentHookNameInDev = 'useDebugValue';1400 updateHookTypesDev();1401 return updateDebugValue(value, formatterFn);1402 },1403 };1404 InvalidNestedHooksDispatcherOnMountInDEV = {1405 readContext<T>(1406 context: ReactContext<T>,1407 observedBits: void | number | boolean,1408 ): T {1409 warnInvalidContextAccess();1410 return readContext(context, observedBits);1411 },1412 useCallback<T>(callback: T, deps: Array<mixed> | void | null): T {1413 currentHookNameInDev = 'useCallback';1414 warnInvalidHookAccess();1415 mountHookTypesDev();1416 return mountCallback(callback, deps);1417 },1418 useContext<T>(1419 context: ReactContext<T>,1420 observedBits: void | number | boolean,1421 ): T {1422 currentHookNameInDev = 'useContext';1423 warnInvalidHookAccess();1424 mountHookTypesDev();1425 return readContext(context, observedBits);1426 },1427 useEffect(1428 create: () => (() => void) | void,1429 deps: Array<mixed> | void | null,1430 ): void {1431 currentHookNameInDev = 'useEffect';1432 warnInvalidHookAccess();1433 mountHookTypesDev();1434 return mountEffect(create, deps);1435 },1436 useImperativeHandle<T>(1437 ref: {current: T | null} | ((inst: T | null) => mixed) | null | void,1438 create: () => T,1439 deps: Array<mixed> | void | null,1440 ): void {1441 currentHookNameInDev = 'useImperativeHandle';1442 warnInvalidHookAccess();1443 mountHookTypesDev();1444 return mountImperativeHandle(ref, create, deps);1445 },1446 useLayoutEffect(1447 create: () => (() => void) | void,1448 deps: Array<mixed> | void | null,1449 ): void {1450 currentHookNameInDev = 'useLayoutEffect';1451 warnInvalidHookAccess();1452 mountHookTypesDev();1453 return mountLayoutEffect(create, deps);1454 },1455 useMemo<T>(create: () => T, deps: Array<mixed> | void | null): T {1456 currentHookNameInDev = 'useMemo';1457 warnInvalidHookAccess();1458 mountHookTypesDev();1459 const prevDispatcher = ReactCurrentDispatcher.current;1460 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1461 try {1462 return mountMemo(create, deps);1463 } finally {1464 ReactCurrentDispatcher.current = prevDispatcher;1465 }1466 },1467 useReducer<S, I, A>(1468 reducer: (S, A) => S,1469 initialArg: I,1470 init?: I => S,1471 ): [S, Dispatch<A>] {1472 currentHookNameInDev = 'useReducer';1473 warnInvalidHookAccess();1474 mountHookTypesDev();1475 const prevDispatcher = ReactCurrentDispatcher.current;1476 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1477 try {1478 return mountReducer(reducer, initialArg, init);1479 } finally {1480 ReactCurrentDispatcher.current = prevDispatcher;1481 }1482 },1483 useRef<T>(initialValue: T): {current: T} {1484 currentHookNameInDev = 'useRef';1485 warnInvalidHookAccess();1486 mountHookTypesDev();1487 return mountRef(initialValue);1488 },1489 useState<S>(1490 initialState: (() => S) | S,1491 ): [S, Dispatch<BasicStateAction<S>>] {1492 currentHookNameInDev = 'useState';1493 warnInvalidHookAccess();1494 mountHookTypesDev();1495 const prevDispatcher = ReactCurrentDispatcher.current;1496 ReactCurrentDispatcher.current = InvalidNestedHooksDispatcherOnMountInDEV;1497 try {1498 return mountState(initialState);1499 } finally {1500 ReactCurrentDispatcher.current = prevDispatcher;1501 }1502 },1503 useDebugValue<T>(value: T, formatterFn: ?(value: T) => mixed): void {1504 currentHookNameInDev = 'useDebugValue';1505 warnInvalidHookAccess();1506 mountHookTypesDev();1507 return mountDebugValue(value, formatterFn);1508 },1509 };1510 InvalidNestedHooksDispatcherOnUpdateInDEV = {1511 readContext<T>(1512 context: ReactContext<T>,1513 observedBits: void | number | boolean,1514 ): T {1515 warnInvalidContextAccess();1516 return readContext(context, observedBits);1517 },1518 useCallback<T>(callback: T, deps: Array<mixed> | void | null): T {1519 currentHookNameInDev = 'useCallback';1520 warnInvalidHookAccess();1521 updateHookTypesDev();...
Using AI Code Generation
1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium.launch();4 const context = await browser.newContext();5 const page = await context.newPage();6 const elementHandle = await page.$('body');7 await elementHandle._debugValue();8 await browser.close();9})();10{ type: 'object',11 objectId: '{"injectedScriptId":1,"id":2}' }
Using AI Code Generation
1const { mountDebugValue } = require('@playwright/test');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 const value = await page.$('text=Get started');8 mountDebugValue(value);9 await browser.close();10})();
Using AI Code Generation
1const { chromium } = require("playwright");2const { mountDebugValue } = require("playwright/lib/server/debugServer");3(async () => {4 const browser = await chromium.launch();5 const page = await browser.newPage();6 await page.waitForSelector("text=Get started");7 const element = await page.$("text=Get started");8 mountDebugValue(element, "element", "element");9 await browser.close();10})();
Using AI Code Generation
1const { mountDebugValue } = require('playwright/lib/server/debugSupport');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 await page.fill('input[name="q"]', 'Hello World');8 await page.click('input[name="btnK"]');9 await page.waitForSelector('h3');10 await page.screenshot({ path: 'test.png' });11 await browser.close();12})();
Using AI Code Generation
1const { mountDebugValue } = require('playwright/lib/server/debugSupport');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const page = await browser.newPage();6 await page.click('text=Get started');7 const element = await page.waitForSelector('text=Playwright');8 await mountDebugValue(element, 'element');9 await browser.close();10})();11const { test } = require('@playwright/test');12test('test', async ({ page }) => {13 await page.click('text=Get started');14 const element = await page.waitForSelector('text=Playwright');15 await element.debugValue();16});17const { mountDebugValue } = require('playwright/lib/server/debugSupport');18const { chromium } = require('playwright');19(async () => {20 const browser = await chromium.launch();21 const page = await browser.newPage();22 await page.click('text=Get started');23 const elements = await page.$$('text=Playwright');24 await mountDebugValue(elements[0], 'first element');25 await mountDebugValue(elements[1], 'second element');26 await browser.close();27})();28const { test } = require('@playwright/test');29test('test', async ({ page }) => {30 await page.click('text=Get started');31 const elements = await page.$$('text=Playwright');32 await elements[0].debugValue();33 await elements[1].debugValue();34});
Using AI Code Generation
1const { mountDebugValue } = require('@playwright/test/lib/server/debug');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 await page.screenshot({ path: 'example.png' });8 await page.evaluate(() => {9 mountDebugValue(document.querySelector('h1'), 'main-title');10 });11 await browser.close();12})();
Using AI Code Generation
1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium.launch();4 const page = await browser.newPage();5 await page.type('#searchInput', 'Playwright');6 await page.keyboard.press('Enter');7 const elementHandle = await page.$('#firstHeading');8 await elementHandle._debugValue();9 await browser.close();10})();
Using AI Code Generation
1const { mountDebugValue } = require('@playwright/test/lib/server/debugServer');2const { chromium } = require('playwright');3const browser = await chromium.launch();4const page = await browser.newPage();5await mountDebugValue(browser, 'browser');6await mountDebugValue(page, 'page');7const { mountDebugValue } = require('@playwright/test/lib/server/debugServer');8const { chromium } = require('playwright');9const browser = await chromium.launch();10const page = await browser.newPage();11await mountDebugValue(browser, 'browser');12await mountDebugValue(page, 'page');13const { mountDebugValue } = require('@playwright/test/lib/server/debugServer');14const { chromium } = require('playwright');15const browser = await chromium.launch();16const page = await browser.newPage();17await mountDebugValue(browser, 'browser');18await mountDebugValue(page, 'page');19const { mountDebugValue } = require('@playwright/test/lib/server/debugServer');20const { chromium } = require('playwright');21const browser = await chromium.launch();22const page = await browser.newPage();23await mountDebugValue(browser, 'browser');24await mountDebugValue(page, 'page');25const { mountDebugValue } = require('@playwright/test/lib/server/debugServer');26const { chromium } = require('playwright');27const browser = await chromium.launch();28const page = await browser.newPage();29await mountDebugValue(browser, 'browser');30await mountDebugValue(page, 'page');31const { mountDebugValue } = require('@playwright/test/lib/server/debugServer');32const { chromium } = require('playwright');33const browser = await chromium.launch();34const page = await browser.newPage();35await mountDebugValue(browser, 'browser');36await mountDebugValue(page, 'page');37const { mountDebugValue } = require('@playwright/test/lib/server/debugServer');38const { chromium } = require('playwright');39const browser = await chromium.launch();40const page = await browser.newPage();41await mountDebugValue(browser, 'browser');
Using AI Code Generation
1const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js');2const { context } = require('playwright-core/lib/server/chromium.js');3const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js');4const { context } = require('playwright-core/lib/server/chromium.js');5const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js');6const { context } = require('playwright-core/lib/server/chromium.js');7const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js');8const { context } = require('playwright-core/lib/server/chromium.js');9const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js');10const { context } = require('playwright-core/lib/server/chromium.js');11const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js');12const { context } = require('playwright-core/lib/server/chromium.js');13const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js');14const { context } = require('playwright-core/lib/server/chromium.js');15const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js');16const { context } = require('playwright-core/lib/server/chromium.js');17const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js');18const { context } = require('playwright-core/lib/server/chromium.js');19const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js');20const { context } = require('playwright-core/lib/server/chromium.js');21const { mountDebugValue } = require('playwright-core/lib/server/debugSupport.js
Using AI Code Generation
1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium.launch({ headless: false });4 const context = await browser.newContext();5 const page = await context.newPage();6 const title = await page.title();7 await page._internalApi().mountDebugValue(title);8 await browser.close();9})();10const { chromium } = require('playwright');11(async () => {12 const browser = await chromium.launch({ headless: false });13 const context = await browser.newContext();14 const page = await context.newPage();15 const title = await page.title();16 await page._internalApi().mountDebugValue(title, 'title');17 await browser.close();18})();
Playwright tutorial
LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.
Chapters:
- What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
- How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
- Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
- What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
- Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
- Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
- Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
- Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
- Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
- Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
- Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
- Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.
Run Playwright Internal automation tests on LambdaTest cloud grid
Perform automation testing on 3000+ real desktop and mobile devices online.
Try LambdaTest Now !!
Get 100 minutes of automation test minutes FREE!!
Was this article helpful?
