@mini-rx/signal-store
Version:
Signal Store for Angular
65 lines • 13.9 kB
JavaScript
// Credits go to NgRx
// Typings are taken directly from NgRx with small modifications:
// https://github.com/ngrx/platform/blob/8.6.0/modules/store/src/selector.ts
// The MIT License (MIT)
//
// Copyright (c) 2017 Brandon Roberts, Mike Ryan, Victor Savkin, Rob Wormald
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
import { computed } from '@angular/core';
export const SIGNAL_SELECTOR_KEY = '@mini-rx/signalSelector';
export function createSelector(...args) {
const selectors = args.slice(0, args.length - 1);
const projector = args[args.length - 1];
const selector = (state) => {
const signalsFromSelectors = selectors.map((fn) => {
return fn(state); // Pass the state Signal
});
// Return computed Signal which recalculates when one of the `signalsFromSelectors` notifies about changes
return computed(() => {
const results = signalsFromSelectors.map((aSignal) => aSignal());
return projector(...results);
});
};
return addSignalSelectorKey(selector);
}
export function createFeatureStateSelector(featureKey) {
let selector;
if (featureKey) {
selector = createSelector(addSignalSelectorKey((state) => state), (state) => state[featureKey]);
}
else {
selector = (state) => state; // Do not memoize: when used with FeatureStore there is a new state object created for every `setState`
}
return addSignalSelectorKey(selector);
}
export function createComponentStateSelector() {
return addSignalSelectorKey((state) => state);
}
// Exported for testing
export function addSignalSelectorKey(s) {
Object.defineProperty(s, SIGNAL_SELECTOR_KEY, {
value: true,
});
return s;
}
export function isSignalSelector(v) {
return Object.hasOwn(v, SIGNAL_SELECTOR_KEY);
}
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IN NO EVENT SHALL THE\n// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\n// SOFTWARE.\n\nimport { computed, Signal } from '@angular/core';\nimport { AppState } from '@mini-rx/common';\n\nexport const SIGNAL_SELECTOR_KEY = '@mini-rx/signalSelector';\n\nexport interface HasSignalSelectorKey {\n    [SIGNAL_SELECTOR_KEY]: true;\n}\n\ntype Selector<T, R> = (state: Signal<T>) => Signal<R>;\nexport type SignalSelector<T, R> = Selector<T, R> & HasSignalSelectorKey;\n\nexport function createSelector<State, S1, Result>(\n    s1: SignalSelector<State, S1>,\n    projector: (s1: S1) => Result\n): SignalSelector<State, Result>;\n\nexport function createSelector<State, S1, S2, Result>(\n    s1: SignalSelector<State, S1>,\n    s2: SignalSelector<State, S2>,\n    projector: (s1: S1, s2: S2) => Result\n): SignalSelector<State, Result>;\n\nexport function createSelector<State, S1, S2, S3, Result>(\n    s1: SignalSelector<State, S1>,\n    s2: SignalSelector<State, S2>,\n    s3: SignalSelector<State, S3>,\n    projector: (s1: S1, s2: S2, s3: S3) => Result\n): SignalSelector<State, Result>;\n\nexport function createSelector<State, S1, S2, S3, S4, Result>(\n    s1: SignalSelector<State, S1>,\n    s2: SignalSelector<State, S2>,\n    s3: SignalSelector<State, S3>,\n    s4: SignalSelector<State, S4>,\n    projector: (s1: S1, s2: S2, s3: S3, s4: S4) => Result\n): SignalSelector<State, Result>;\n\nexport function createSelector<State, S1, S2, S3, S4, S5, Result>(\n    s1: SignalSelector<State, S1>,\n    s2: SignalSelector<State, S2>,\n    s3: SignalSelector<State, S3>,\n    s4: SignalSelector<State, S4>,\n    s5: SignalSelector<State, S5>,\n    projector: (s1: S1, s2: S2, s3: S3, s4: S4, s5: S5) => Result\n): SignalSelector<State, Result>;\n\nexport function createSelector<State, S1, S2, S3, S4, S5, S6, Result>(\n    s1: SignalSelector<State, S1>,\n    s2: SignalSelector<State, S2>,\n    s3: SignalSelector<State, S3>,\n    s4: SignalSelector<State, S4>,\n    s5: SignalSelector<State, S5>,\n    s6: SignalSelector<State, S6>,\n    projector: (s1: S1, s2: S2, s3: S3, s4: S4, s5: S5, s6: S6) => Result\n): SignalSelector<State, Result>;\n\nexport function createSelector<State, S1, S2, S3, S4, S5, S6, S7, Result>(\n    s1: SignalSelector<State, S1>,\n    s2: SignalSelector<State, S2>,\n    s3: SignalSelector<State, S3>,\n    s4: SignalSelector<State, S4>,\n    s5: SignalSelector<State, S5>,\n    s6: SignalSelector<State, S6>,\n    s7: SignalSelector<State, S7>,\n    projector: (s1: S1, s2: S2, s3: S3, s4: S4, s5: S5, s6: S6, s7: S7) => Result\n): SignalSelector<State, Result>;\n\nexport function createSelector<State, S1, S2, S3, S4, S5, S6, S7, S8, Result>(\n    s1: SignalSelector<State, S1>,\n    s2: SignalSelector<State, S2>,\n    s3: SignalSelector<State, S3>,\n    s4: SignalSelector<State, S4>,\n    s5: SignalSelector<State, S5>,\n    s6: SignalSelector<State, S6>,\n    s7: SignalSelector<State, S7>,\n    s8: SignalSelector<State, S8>,\n    projector: (s1: S1, s2: S2, s3: S3, s4: S4, s5: S5, s6: S6, s7: S7, s8: S8) => Result\n): SignalSelector<State, Result>;\n\nexport function createSelector(...args: any[]): SignalSelector<any, any> {\n    const selectors = args.slice(0, args.length - 1);\n    const projector = args[args.length - 1];\n\n    const selector: Selector<any, any> = (state) => {\n        const signalsFromSelectors: Signal<any>[] = selectors.map((fn) => {\n            return fn(state); // Pass the state Signal\n        });\n\n        // Return computed Signal which recalculates when one of the `signalsFromSelectors` notifies about changes\n        return computed(() => {\n            const results: any[] = signalsFromSelectors.map((aSignal) => aSignal());\n            return projector(...results);\n        });\n    };\n\n    return addSignalSelectorKey(selector);\n}\n\nexport function createFeatureStateSelector<T>(featureKey?: string): SignalSelector<object, T>;\nexport function createFeatureStateSelector<T, V>(featureKey: keyof T): SignalSelector<T, V>;\nexport function createFeatureStateSelector(featureKey?: any): SignalSelector<any, any> {\n    let selector: Selector<any, any>;\n    if (featureKey) {\n        selector = createSelector(\n            addSignalSelectorKey((state: Signal<any>) => state),\n            (state: AppState) => state[featureKey]\n        );\n    } else {\n        selector = (state) => state; // Do not memoize: when used with FeatureStore there is a new state object created for every `setState`\n    }\n    return addSignalSelectorKey(selector);\n}\n\nexport function createComponentStateSelector<T>(): SignalSelector<T, T> {\n    return addSignalSelectorKey((state: Signal<T>) => state);\n}\n\n// Exported for testing\nexport function addSignalSelectorKey<T, R>(s: Selector<T, R>): SignalSelector<T, R> {\n    Object.defineProperty(s, SIGNAL_SELECTOR_KEY, {\n        value: true,\n    });\n\n    return s as SignalSelector<T, R>;\n}\n\nexport function isSignalSelector(v: any): v is SignalSelector<any, any> {\n    return Object.hasOwn(v, SIGNAL_SELECTOR_KEY);\n}\n"]}