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childEntitySelector is a function which creates a predefined relationship selector factory. Its goal is to simply the process of creating relationship selectors with childEntity.

declare function childEntitySelector(  entityStateSelector,  keyId,  keyValue,);

Its parameters are the same as childEntity has, but without relationships.

const address = rootEntitySelector(  selectAddressState,);const addressCompany = childEntitySelector(  selectCompanyState,  'addressId',  'company',);
// later.const address1 = address(  addressCompany(),);
// the same as.const address2 = rootEntity(  selectAddressState,  childEntity(    selectCompanyState,    'addressId',    'company',  ),);