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# default()

Returns a new default configuration that is persistent and not unique.

```
class func `default`() -> Self
```

## Discussion

If a [`WKWebExtensionController`](/documentation/WebKit/WKWebExtensionController) is associated with a persistent configuration, data will be written to the file system in a common location. When using multiple extension controllers, each controller should use a unique configuration to avoid conflicts.

## See Also

[`init(identifier:)`](/documentation/WebKit/WKWebExtensionController/Configuration-swift.class/init(identifier:))

Returns a new configuration that is persistent and unique for the specified identifier.


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