Function createNestedSelectors

modules/store/src/feature_creator.ts:238–257

(
  featureSelector: MemoizedSelector<Record<string, any>, FeatureState>,
  reducer: ActionReducer<FeatureState>
)

}

function createNestedSelectors<FeatureState>(
  featureSelector: MemoizedSelector<Record<string, any>, FeatureState>,
  reducer: ActionReducer<FeatureState>
): NestedSelectors<FeatureState> {
  const initialState = getInitialState(reducer);
  const nestedKeys = (
    isPlainObject(initialState) ? Object.keys(initialState) : []
  ) as Array<keyof FeatureState & string>;

  return nestedKeys.reduce(
    (nestedSelectors, nestedKey) => ({
      ...nestedSelectors,
      [`select${capitalize(nestedKey)}`]: createSelector(
        featureSelector,
        (parentState) => parentState?.[nestedKey]
      ),
    }),
    {} as NestedSelectors<FeatureState>
  );
}

function getInitialState<FeatureState>(
  reducer: ActionReducer<FeatureState>