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Entity state selector

An entity state selector can be:

The first case is useful when the id key of an entity is not id, but another one: Id, uuid, etc. Then you can define here the key name, or a function which returns its value from an entity.

const selector1 = {  collection: createFeatureSelector('users'),  id: 'Id',};const selector2 = {  collection: state => state.companies,  id: 'uuid',};const selector3 = {  collection: stateKeys(    createFeatureSelector('addresses'),    'byIds',    'existingIds',  ),  id: entity => entity.uuid,};