SOURCE_ADDED
The source has been added with `addStyleSource` method. The event is emitted synchronously, therefore, it is possible to immediately read added source's properties. ``` text Event data format (Object): . └── id - String ```
The source has been added with `addStyleSource` method. The event is emitted synchronously, therefore, it is possible to immediately read added source's properties. ``` text Event data format (Object): . └── id - String ```