def METHOD_NAME(self) -> DecoderEventMappingType:
    return {CPT_OPTIMISM: {
        HistoryEventType.DEPOSIT: {
            HistoryEventSubType.BRIDGE: EventCategory.BRIDGE_IN,
        },
        HistoryEventType.WITHDRAWAL: {
            HistoryEventSubType.BRIDGE: EventCategory.BRIDGE_OUT,
        },
    }}