ngrx-store-persist/dist/storage-sync.js

ngrx-store-persist depends on @ngrx/store and angular 2+

import * as deepmerge from "deepmerge";
import { validateStateKeys } from "./helpers";
import { config } from "./options";
const INIT_ACTION = '@ngrx/store/init';
const UPDATE_ACTION = '@ngrx/store/update-reducers';
export function storageSync(reducer) {
    const stateKeys = validateStateKeys(config.keys);
    const rehydratedState = rehydrateApplicationState(stateKeys, config.storage);
    return function (state, action) {
        let nextState;
        if ((action.type === INIT_ACTION) && !state) {
            nextState = reducer(state, action);
        }
        else {
            nextState = Object.assign({}, state);
        }
        if (action.type === INIT_ACTION || action.type === UPDATE_ACTION) {
            // @ts-ignore
            const overwriteMerge = (destinationArray, sourceArray) => sourceArray;
            const options = {
                arrayMerge: overwriteMerge
            };
            nextState = deepmerge(nextState, rehydratedState, options);
        }
        nextState = reducer(nextState, action);
        if (action.type !== INIT_ACTION) {
            syncStateUpdate(nextState, stateKeys, config.storage);
        }
        return nextState;
    };
}
export const rehydrateApplicationState = (keys, storage) => {
    return keys.reduce((acc, curr) => {
        let key = curr;
        if (storage !== undefined) {
            let stateSlice = storage.getItem(key);
            if (stateSlice) {
                const isObjectRegex = new RegExp('{|\\[');
                let raw = stateSlice;
                if (stateSlice === 'null' || isObjectRegex.test(stateSlice.charAt(0))) {
                    raw = JSON.parse(stateSlice);
                }
                return Object.assign({}, acc, {
                    [key]: raw
                });
            }
        }
        return acc;
    }, {});
};
export const syncStateUpdate = (state, keys, storage) => {
    keys.forEach(key => {
        let stateSlice = state[key];
        let replacer = undefined;
        let space = undefined;
        if (typeof stateSlice !== 'undefined' && storage !== undefined) {
            try {
                storage.setItem(key, typeof stateSlice === 'string'
                    ? stateSlice
                    : JSON.stringify(stateSlice, replacer, space));
            }
            catch (e) {
                console.warn('Unable to save state to localStorage:', e);
            }
        }
        else if (typeof stateSlice === 'undefined') {
            try {
                storage.removeItem(key);
            }
            catch (e) {
                console.warn(`Exception on removing/cleaning undefined '${key}' state`, e);
            }
        }
    });
};
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