nedux/dist/store.js

the next redux state management

import { BehaviorSubject } from 'rxjs';
export const createStore = (initState, middlewares = []) => {
    // Map each `initState` entiries to a BehaviorSubject
    const subjects = Object.keys(initState).reduce((acc, key) => {
        const defaultValue = initState[key];
        const subject = new BehaviorSubject(defaultValue);
        return { ...acc, [key]: subject };
    }, {});
    /**
     * Get the stored value at the key
     * @param key target key
     */
    const get = (key) => {
        return subjects[key].getValue();
    };
    /**
     * Set a new value of the propertie `key` of the store
     * @param key target key
     * @param value new value
     */
    const set = (key, value) => {
        subjects[key].next(typeof value === 'function' ? value(get(key)) : value);
    };
    // @todo conditional typing return
    /**
     * Subscribe to a key of the store
     * @param key target key you want to subscribe
     * @param observer observer that will be called each time the value of key has changed
     */
    const subscribe = (key, observer) => key === ''
        ? Object.values(subjects).map(sub => sub.subscribe(observer))
        : subjects[key].subscribe(observer);
    // Create the store
    const store = { get, set, subscribe };
    // Intialize all middlewares
    middlewares.forEach(factory => factory(store));
    return store;
};
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