If you are not sure that certain attribute is present, you can add check it’s type for undefined. For example, filter below will match if client-side attribute ‘firmware_version’ is set and equal to ‘1.0.0’
typeof cs.firmware_version !== 'undefined' && cs.firmware_version === '1.0.0'
Assuming following device attributes and their types - firmware_version - client-side - country - client-side - subscription_plan - shared - balance - server-side
Following filter will match all premium subscription devices with positive balance that are located in USA with firmware version equal to 1.1.0
cs.firmware_version=='1.1.0' && cs.country=='USA' && shared.subscription_plan=='premium' && ss.balance > 0
If you are not sure that all attributes are present for your device, you should use following syntax that adds all necessary “null” checks
typeof cs.firmware_version !== 'undefined' && typeof cs.country !== 'undefined' && typeof shared.subscription_plan !== 'undefined' && typeof ss.balance !== 'undefined' && cs.firmware_version=='1.1.0' && cs.country=='USA' && shared.subscription_plan=='premium' && ss.balance > 0