Function createFeature

modules/store/src/feature_creator.ts:201–236

(
  featureConfig: FeatureConfig<FeatureName, FeatureState> & {
    extraSelectors?: ExtraSelectorsFactory<
      FeatureName,
      FeatureState,
      ExtraSelectors
    >;
  }
)

 * ```
 */
export function createFeature<
  FeatureName extends string,
  FeatureState,
  ExtraSelectors extends SelectorsDictionary,
>(
  featureConfig: FeatureConfig<FeatureName, FeatureState> & {
    extraSelectors?: ExtraSelectorsFactory<
      FeatureName,
      FeatureState,
      ExtraSelectors
    >;
  }
): Feature<FeatureName, FeatureState> & ExtraSelectors {
  const {
    name,
    reducer,
    extraSelectors: extraSelectorsFactory,
  } = featureConfig;

  const featureSelector = createFeatureSelector<FeatureState>(name);
  const nestedSelectors = createNestedSelectors(featureSelector, reducer);
  const baseSelectors = {
    [`select${capitalize(name)}State`]: featureSelector,
    ...nestedSelectors,
  } as BaseSelectors<FeatureName, FeatureState>;
  const extraSelectors = extraSelectorsFactory
    ? extraSelectorsFactory(baseSelectors)
    : {};

  return {
    name,
    reducer,
    ...baseSelectors,
    ...extraSelectors,
  } as Feature<FeatureName, FeatureState> & ExtraSelectors;
}

function createNestedSelectors<FeatureState>(
  featureSelector: MemoizedSelector<Record<string, any>, FeatureState>,