1.9 KiB
1.9 KiB
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() |