@interface SiriTTSService.DeviceSynthesisAction : SiriTTSService.Buffer {
    void /* unknown type, empty encoding */ asyncContext;
    void /* unknown type, empty encoding */ queue;
    void /* unknown type, empty encoding */ notificationCenter;
    void /* unknown type, empty encoding */ observers;
    void /* unknown type, empty encoding */ internalSettings;
    void /* unknown type, empty encoding */ synthesisConfig;
    void /* unknown type, empty encoding */ _isCancelled;
    void /* unknown type, empty encoding */ _ongoingEngine;
}

@end