puppeteer/website/versioned_docs/version-18.1.0/api/puppeteer.coverage.startjscoverage.md
release-please[bot] 3aee641c3d
chore(main): release 18.1.0 (#9042)
🤖 I have created a release *beep* *boop*
---


##
[18.1.0](https://github.com/puppeteer/puppeteer/compare/v18.0.5...v18.1.0)
(2022-10-05)


### Features

* **chromium:** roll to Chromium 107.0.5296.0 (r1045629)
([#9039](https://github.com/puppeteer/puppeteer/issues/9039))
([022fbde](022fbde85e))

---
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---
sidebar_label: Coverage.startJSCoverage
---
# Coverage.startJSCoverage() method
**Signature:**
```typescript
class Coverage {
startJSCoverage(options?: JSCoverageOptions): Promise<void>;
}
```
## Parameters
| Parameter | Type | Description |
| --------- | ----------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------- |
| options | [JSCoverageOptions](./puppeteer.jscoverageoptions.md) | <i>(Optional)</i> Set of configurable options for coverage defaults to <code>resetOnNavigation : true, reportAnonymousScripts : false</code> |
**Returns:**
Promise&lt;void&gt;
Promise that resolves when coverage is started.
## Remarks
Anonymous scripts are ones that don't have an associated url. These are scripts that are dynamically created on the page using `eval` or `new Function`. If `reportAnonymousScripts` is set to `true`, anonymous scripts URL will start with `debugger://VM` (unless a magic //\# sourceURL comment is present, in which case that will the be URL).