| 1 | import { capitalize } from './helpers';
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| 2 | import { isPlainObject } from './meta-reducers/utils';
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| 3 | import { createFeatureSelector, createSelector, } from './selector';
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| 4 | /**
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| 5 | * @description
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| 6 | * A function that accepts a feature name and a feature reducer, and creates
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| 7 | * a feature selector and a selector for each feature state property.
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| 8 | *
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| 9 | * @param featureConfig An object that contains a feature name and a feature reducer.
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| 10 | * @returns An object that contains a feature name, a feature reducer,
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| 11 | * a feature selector, a the selector for each feature state property.
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| 12 | *
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| 13 | * @usageNotes
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| 14 | *
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| 15 | * **With Application State**
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| 16 | *
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| 17 | * ```ts
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| 18 | * interface AppState {
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| 19 | * products: ProductsState;
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| 20 | * }
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| 21 | *
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| 22 | * interface ProductsState {
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| 23 | * products: Product[];
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| 24 | * selectedId: string | null;
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| 25 | * }
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| 26 | *
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| 27 | * const initialState: ProductsState = {
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| 28 | * products: [],
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| 29 | * selectedId: null,
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| 30 | * };
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| 31 | *
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| 32 | * // AppState is passed as a generic argument
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| 33 | * const productsFeature = createFeature<AppState>({
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| 34 | * name: 'products',
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| 35 | * reducer: createReducer(
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| 36 | * initialState,
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| 37 | * on(ProductsApiActions.loadSuccess(state, { products }) => ({
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| 38 | * ...state,
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| 39 | * products,
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| 40 | * }),
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| 41 | * ),
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| 42 | * });
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| 43 | *
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| 44 | * const {
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| 45 | * selectProductsState, // type: MemoizedSelector<AppState, ProductsState>
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| 46 | * selectProducts, // type: MemoizedSelector<AppState, Product[]>
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| 47 | * selectSelectedId, // type: MemoizedSelector<AppState, string | null>
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| 48 | * } = productsFeature;
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| 49 | * ```
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| 50 | *
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| 51 | * **Without Application State**
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| 52 | *
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| 53 | * ```ts
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| 54 | * const productsFeature = createFeature({
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| 55 | * name: 'products',
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| 56 | * reducer: createReducer(initialState),
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| 57 | * });
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| 58 | *
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| 59 | * const {
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| 60 | * selectProductsState, // type: MemoizedSelector<Record<string, any>, ProductsState>
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| 61 | * selectProducts, // type: MemoizedSelector<Record<string, any>, Product[]>
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| 62 | * selectSelectedId, // type: MemoizedSelector<Record<string, any, string | null>
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| 63 | * } = productsFeature;
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| 64 | * ```
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| 65 | */
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| 66 | export function createFeature(featureConfig) {
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| 67 | const { name, reducer } = featureConfig;
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| 68 | const featureSelector = createFeatureSelector(name);
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| 69 | const nestedSelectors = createNestedSelectors(featureSelector, reducer);
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| 70 | return Object.assign({ name,
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| 71 | reducer, [`select${capitalize(name)}State`]: featureSelector }, nestedSelectors);
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| 72 | }
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| 73 | function createNestedSelectors(featureSelector, reducer) {
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| 74 | const initialState = getInitialState(reducer);
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| 75 | const nestedKeys = (isPlainObject(initialState)
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| 76 | ? Object.keys(initialState)
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| 77 | : []);
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| 78 | return nestedKeys.reduce((nestedSelectors, nestedKey) => (Object.assign(Object.assign({}, nestedSelectors), { [`select${capitalize(nestedKey)}`]: createSelector(featureSelector, (parentState) => parentState === null || parentState === void 0 ? void 0 : parentState[nestedKey]) })), {});
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| 79 | }
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| 80 | function getInitialState(reducer) {
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| 81 | return reducer(undefined, { type: '@ngrx/feature/init' });
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| 82 | }
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| 83 | //# 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