[List all supported unit systems](List all supported unit systems <https://developer.cognite.com/api#tag/Unit-Systems/operation/listUnitSystems)
const units = await client.units.listUnitSystems();
const units = await client.units.retrieve([{ externalId: 'temperature:deg_c' }, { externalId: 'pressure:bar' }]);
List all supported units
const units = await client.units.list();