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TS typedef

On the one hand, ngrx-entity-relationship has rich and complex typedefs which allow to notify about issues in definition of root selectors and their relationships during transpilation process.

On the other hand, it makes manual definition of typdefs for root selectors annoying.

HANDLER_ENTITY vs HANDLER_ROOT_ENTITY​

For root selectors which select single entities, it is better to use HANDLER_ENTITY instead of HANDLER_ROOT_ENTITY:

const selectUser1: HANDLER_ENTITY<User> = rootEntity(/*...*/);
// instead of
const selectUser2: HANDLER_ROOT_ENTITY<
  StoreState,
  User,
  User,
  string
> = rootEntity(/*...*/);

HANDLER_ENTITIES vs HANDLER_ROOT_ENTITIES​

For root selectors which select arrays of entities, it is better to use HANDLER_ENTITIES instead of HANDLER_ROOT_ENTITIES:

const selectUsers1: HANDLER_ENTITIES<User> = rootEntities(/*...*/);
// instead of
const selectUsers2: HANDLER_ROOT_ENTITIES<
  StoreState,
  User,
  User,
  string
> = rootEntities(/*...*/);