puppeteer/docs/api/puppeteer.coverage.startjscoverage.md
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2024-03-20 15:03:14 +00:00

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---
sidebar_label: Coverage.startJSCoverage
---
# Coverage.startJSCoverage() method
#### Signature:
```typescript
class Coverage {
startJSCoverage(options?: JSCoverageOptions): Promise<void>;
}
```
## Parameters
<table><thead><tr><th>
Parameter
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td>
options
</td><td>
[JSCoverageOptions](./puppeteer.jscoverageoptions.md)
</td><td>
_(Optional)_ Set of configurable options for coverage defaults to `resetOnNavigation : true, reportAnonymousScripts : false,` `includeRawScriptCoverage : false, useBlockCoverage : true`
</td></tr>
</tbody></table>
**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).