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How to use assertNoFirstContentfulPaint method in wpt

Best JavaScript code snippet using wpt

utils.js

Source:utils.js

...10  });11}12// Asserts that there is currently no FCP reported. Pass t to add some wait, in case CSS is loaded13// and FCP is incorrectly fired afterwards.14async function assertNoFirstContentfulPaint(t) {15  await waitForAnimationFrames(3);16  assert_equals(performance.getEntriesByName('first-contentful-paint').length, 0, 'First contentful paint marked too early. ');17}18// Function that is resolved once FCP is reported, using PerformanceObserver. It rejects after a long19// wait time so that failing tests don't timeout.20async function assertFirstContentfulPaint(t) {21  return new Promise(resolve  => {22    function checkFCP() {23      if (performance.getEntriesByName('first-contentful-paint').length === 1) {24        resolve();25      } else {26        requestAnimationFrame(checkFCP)27      }28    }29    t.step(checkFCP);30  });31}32async function test_fcp(label) {33  const style = document.createElement('style');34  document.head.appendChild(style);35  await promise_test(async t => {36    assert_precondition(window.PerformancePaintTiming, "Paint Timing isn't supported.");37    const main = document.getElementById('main');38    await new Promise(r => window.addEventListener('load', r));39    await assertNoFirstContentfulPaint(t);40    main.className = 'preFCP';41    await assertNoFirstContentfulPaint(t);42    main.className = 'contentful';43    await assertFirstContentfulPaint(t);44  }, label);...

Using AI Code Generation

1const assertNoFirstContentfulPaint = require('wpt-api').assertNoFirstContentfulPaint;2assertNoFirstContentfulPaint(url)3  .then((result) => {4    console.log(result);5  })6  .catch((err) => {7    console.log(err);8  });9const assertNoFirstMeaningfulPaint = require('wpt-api').assertNoFirstMeaningfulPaint;10assertNoFirstMeaningfulPaint(url)11  .then((result) => {12    console.log(result);13  })14  .catch((err) => {15    console.log(err);16  });17const assertNoFirstCPUIdle = require('wpt-api').assertNoFirstCPUIdle;18assertNoFirstCPUIdle(url)19  .then((result) => {20    console.log(result);21  })22  .catch((err) => {23    console.log(err);24  });25const assertNoFirstInteractive = require('wpt-api').assertNoFirstInteractive;26assertNoFirstInteractive(url)27  .then((result) => {28    console.log(result);29  })30  .catch((err) => {31    console.log(err);32  });

Using AI Code Generation

1const wpt = require('webpagetest');2const wptClient = wpt('www.webpagetest.org');3  console.log(data);4});5const wpt = require('webpagetest');6const wptClient = wpt('www.webpagetest.org');7  console.log(data);8});9const wpt = require('webpagetest');10const wptClient = wpt('www.webpagetest.org');11  console.log(data);12});13const wpt = require('webpagetest');14const wptClient = wpt('www.webpagetest.org');15  console.log(data);16});17const wpt = require('webpagetest');18const wptClient = wpt('www.webpagetest.org');19  console.log(data);20});21const wpt = require('webpagetest');22const wptClient = wpt('www.webpagetest.org');23  console.log(data);24});25const wpt = require('webpagetest');26const wptClient = wpt('www.webpagetest.org');

Using AI Code Generation

1(async () => {2  const {browser, page} = await startBrowser();3  await assertNoFirstContentfulPaint(page);4  await browser.close();5})();6const assertNoFirstContentfulPaint = async (page) => {7  await page.waitFor(10000);8  const metrics = await page.metrics();9  console.log(metrics);10  if (metrics.FirstContentfulPaint > 0) {11    throw new Error('FirstContentfulPaint is not 0');12  }13};14const startBrowser = async () => {15  const browser = await puppeteer.launch({16  });17  const page = await browser.newPage();18  return {browser, page};19};20module.exports = {21};

Using AI Code Generation

1const wptb = require('wptb-api');2const assert = require('assert');3(async () => {4  const api = new wptb();5  const result = await test.run();6  const resultData = await result.get();7  const resultId = await result.getId();8  const resultUrl = await result.getUrl();9  const resultTest = await result.getTest();10  const resultTestUrl = await result.getTestUrl();11  const resultTestData = await result.getTestData();12  const resultTestDataId = await result.getTestDataId();13  const resultTestDataUrl = await result.getTestDataUrl();14  const resultTestDataTest = await result.getTestDataTest();15  const resultTestDataTestUrl = await result.getTestDataTestUrl();16  const resultTestDataTestData = await result.getTestDataTestData();17  const resultTestDataTestDataId = await result.getTestDataTestDataId();18  const resultTestDataTestDataUrl = await result.getTestDataTestDataUrl();19  const resultTestDataTestDataTest = await result.getTestDataTestDataTest();20  const resultTestDataTestDataTestUrl = await result.getTestDataTestDataTestUrl();21  const resultTestDataTestDataTestData = await result.getTestDataTestDataTestData();22  const resultTestDataTestDataTestDataId = await result.getTestDataTestDataTestDataId();23  const resultTestDataTestDataTestDataUrl = await result.getTestDataTestDataTestDataUrl();24  const resultTestDataTestDataTestDataTest = await result.getTestDataTestDataTestDataTest();25  const resultTestDataTestDataTestDataTestUrl = await result.getTestDataTestDataTestDataTestUrl();26  const resultTestDataTestDataTestDataTestData = await result.getTestDataTestDataTestDataTestData();27  const resultTestDataTestDataTestDataTestDataId = await result.getTestDataTestDataTestDataTestDataId();28  const resultTestDataTestDataTestDataTestDataUrl = await result.getTestDataTestDataTestDataTestDataUrl();29  const resultTestDataTestDataTestDataTestDataTest = await result.getTestDataTestDataTestDataTestDataTest();30  const resultTestDataTestDataTestDataTestDataTestUrl = await result.getTestDataTestDataTestDataTestDataTestUrl();

Using AI Code Generation

1async function testNoFirstContentfulPaint() {2  try {3    await assertNoFirstContentfulPaint();4  } catch (e) {5  }6}7async function testNoFirstInputDelay() {8  try {9    await assertNoFirstInputDelay();10  } catch (e) {11  }12}13async function testNoLargestContentfulPaint() {14  try {15    await assertNoLargestContentfulPaint();16  } catch (e) {17  }18}19async function testNoLayoutShift() {20  try {21    await assertNoLayoutShift();22  } catch (e) {23  }24}25async function testNoLongTasks() {26  try {27    await assertNoLongTasks();28  } catch (e) {29  }30}31async function testNoSpeedIndex() {32  try {33    await assertNoSpeedIndex();34  } catch (e) {35  }36}37async function testNoTimeToFirstByte() {38  try {39    await assertNoTimeToFirstByte();40  } catch (e) {

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