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# Function useAppReady

*   <a id="useappready"></a>
    
    ```typescript
    useAppReady(source?: string): void
    ```
    
    Report first app readiness after this React tree commits. The host uses this to replace last-good pixels/skeleton with the live iframe.
    
    #### Parameters
    
    *   source: string = 'react-effect'
    
    #### Returns void