[Home](./index.md) > [@empathyco/x-components](./x-components.md) > [InstallXOptions](./x-components.installxoptions.md) > [onCreateApp](./x-components.installxoptions.oncreateapp.md) ## InstallXOptions.onCreateApp property Callback to invoke after instantiating the app. **Signature:** ```typescript onCreateApp?: (app: App) => void; ```