ngrx-store-sync

Simple syncing between @ngrx/store and configurable storage. Supports async storage API for easy integrations with APIs such as LocalForage and Ionic Storage

Inspired by (and forked from) ngrx-store-localstorage

Dependencies

ngrx-store-sync depends on @ngrx/store and Angular 8+.

Installation

npm install ngrx-store-sync --save
or 
yarn add ngrx-store-sync

Usage

Below is an example of using the StoreSyncModule with Ionic Storage:

export const STORE_SYNC_CONFIG = new InjectionToken<any>('Store Sync Configuration');
export function storeSyncConfigFactory(storage: StoreStorage): StoreSyncConfig {
    return {
        keys: ['key1', 'key2', 'key3'],
        rehydrate: true,
        storage
    };
}

@NgModule({
    imports: [
        ...,
        IonicStorageModule.forRoot({
            ...
        }),
        StoreSyncModule.forRoot(STORE_SYNC_CONFIG)
    ],
    providers: [
        ...,
        { provide: STORE_SYNC_CONFIG, deps: [Storage], useFactory: storeSyncConfigFactory },
    ]
)
export class AppModule {
    ...
}

API

StoreSyncConfig

An interface defining the configuration attributes to bootstrap StoreSyncModule. The following are properties which compose StoreSyncConfig:

• keys (required) State keys to sync with local storage. The keys can be defined in two different formats:

  • string[]: Array of strings representing the state (reducer) keys. Full state will be synced (e.g. StoreSyncModule.forRoot({keys: ['todos']})).

  • object[]: Array of objects where for each object the key represents the state key and the value represents custom serialize/deserialize options. This can be one of the following:

    • An array of properties which should be synced. This allows for the partial state sync (e.g. StoreSyncModule.forRoot({keys: [{todos: ['name', 'status'] }, ... ]})).

    • A reviver function as specified in the JSON.parse documentation.

    • An object with properties that specify one or more of the following:

      • serialize: A function that takes a state object and returns a plain json object to pass to json.stringify.

      • deserialize: A function that takes that takes the raw JSON from JSON.parse and builds a state object.

      • replacer: A replacer function as specified in the JSON.stringify documentation.

      • space: The space value to pass JSON.stringify.

      • reviver: A reviver function as specified in the JSON.parse documentation.

      • filter: An array of properties which should be synced (same format as the stand-alone array specified above).

• rehydrate (optional) boolean: Pull initial state from storage on startup, this will default to false.

• storage (optional) Storage: Specify an object that conforms to the StoreStorage interface to use, this will default to localStorage.

• removeOnUndefined (optional) boolean: Specify if the state is removed from the storage when the new value is undefined, this will default to false.

• storageKeySerializer (optional) (key: string) => string: Сustom serialize function for storage keys, used to avoid Storage conflicts.

• restoreDates (boolean? = true): Restore serialized date objects. If you work directly with ISO date strings, set this option to false.

• syncCondition (optional) (state) => boolean: When set, sync to storage medium will only occur when this function returns a true boolean. Example: (state) => state.config.syncToStorage will check the state tree under config.syncToStorage and if true, it will sync to the storage. If undefined or false it will not sync to storage. Often useful for "remember me" options in login.

• checkStorageAvailability (boolean? = false): Specify if the storage availability checking is expected, i.e. for server side rendering / Universal.