puppeteer/docs/api/puppeteer.coverage.md
jrandolf f07ad2c661
fix: update documentation on configuring puppeteer (#9150)
This PR updates the docs regarding configuring puppeteer. In addition,
some changes have been made to the documentation generator to show
default values on the documentation site.

Also fixes: https://github.com/puppeteer/puppeteer/pull/9144
2022-10-24 09:07:05 +02:00

2.2 KiB

sidebar_label
Coverage

Coverage class

The Coverage class provides methods to gathers information about parts of JavaScript and CSS that were used by the page.

Signature:

export declare class Coverage

Remarks

To output coverage in a form consumable by Istanbul, see puppeteer-to-istanbul.

Example

An example of using JavaScript and CSS coverage to get percentage of initially executed code:

// Enable both JavaScript and CSS coverage
await Promise.all([
  page.coverage.startJSCoverage(),
  page.coverage.startCSSCoverage(),
]);
// Navigate to page
await page.goto('https://example.com');
// Disable both JavaScript and CSS coverage
const [jsCoverage, cssCoverage] = await Promise.all([
  page.coverage.stopJSCoverage(),
  page.coverage.stopCSSCoverage(),
]);
let totalBytes = 0;
let usedBytes = 0;
const coverage = [...jsCoverage, ...cssCoverage];
for (const entry of coverage) {
  totalBytes += entry.text.length;
  for (const range of entry.ranges) usedBytes += range.end - range.start - 1;
}
console.log(`Bytes used: ${(usedBytes / totalBytes) * 100}%`);

Constructors

Constructor Modifiers Description
(constructor)(client) Constructs a new instance of the Coverage class

Methods

Method Modifiers Description
startCSSCoverage(options)
startJSCoverage(options)
stopCSSCoverage()
stopJSCoverage()