Function createFeatureSelector

modules/store/src/selector.ts:710–731

(
  featureName: any
)

  featureName: keyof T
): MemoizedSelector<T, V>;
export function createFeatureSelector(
  featureName: any
): MemoizedSelector<any, any> {
  return createSelector(
    (state: any) => {
      const featureState = state[featureName];
      if (!isNgrxMockEnvironment() && isDevMode() && !(featureName in state)) {
        console.warn(
          `@ngrx/store: The feature name "${featureName}" does ` +
            'not exist in the state, therefore createFeatureSelector ' +
            'cannot access it.  Be sure it is imported in a loaded module ' +
            `using StoreModule.forRoot('${featureName}', ...) or ` +
            `StoreModule.forFeature('${featureName}', ...).  If the default ` +
            'state is intended to be undefined, as is the case with router ' +
            'state, this development-only warning message can be ignored.'
        );
      }
      return featureState;
    },
    (featureState: any) => featureState
  );
}

function isSelectorsDictionary(
  selectors: unknown