client: {
    mandatory: {};
    optional: {
        FanControl: Type<FanControl.Cluster, Type<Of<{
            attributes: {};
            commands: {};
            events: {};
            id: 0;
            name: "Unknown";
            revision: 0;
        }>, typeof ClusterBehavior, FanControlInterface>, FanControlInterface>;
        OccupancySensing: Type<OccupancySensing.Cluster, typeof ClusterBehavior, {
            components: never[];
        }>;
        RelativeHumidityMeasurement: Type<RelativeHumidityMeasurement.Cluster, typeof ClusterBehavior, {
            components: never[];
        }>;
        TemperatureMeasurement: Type<TemperatureMeasurement.Cluster, typeof ClusterBehavior, {
            components: never[];
        }>;
        TimeSynchronization: Type<TimeSynchronization.Cluster, Type<Of<{
            attributes: {};
            commands: {};
            events: {};
            id: 0;
            name: "Unknown";
            revision: 0;
        }>, typeof ClusterBehavior, TimeSynchronizationInterface>, TimeSynchronizationInterface>;
    };
} = ...

A definition for each client cluster supported by the endpoint per the Matter specification.