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