@nent/core
Version:
41 lines (40 loc) • 1.54 kB
JavaScript
/*!
* NENT 2022
*/
import { DATA_EVENTS, } from '../../../services/data/interfaces';
/* It's a wrapper around the localStorage API that emits an event when the data changes */
export class StorageService {
/**
* `constructor` is a function that is called when a new instance of the class is created
* @param {Window} win - Window - the window object
* @param {IEventEmitter} eventBus - This is the event bus that we created in the previous step.
* @param {string} name - The name of the provider. This is used to identify the provider when
* emitting events.
* @param {string} [prefix] - This is the prefix that will be used for all keys in the local storage.
*/
constructor(win, eventBus, name, prefix = '') {
this.eventBus = eventBus;
this.name = name;
this.prefix = prefix;
this.localStorage = win.localStorage;
window === null || window === void 0 ? void 0 : window.addEventListener('storage', () => {
this.eventBus.emit(DATA_EVENTS.DataChanged, {
provider: this.name,
});
}, { passive: true });
}
async get(key) {
var _a;
return ((_a = this.localStorage) === null || _a === void 0 ? void 0 : _a.getItem(this.prefix + key)) || null;
}
async set(key, value) {
var _a;
const existing = await this.get(key);
if (existing == value)
return;
(_a = this.localStorage) === null || _a === void 0 ? void 0 : _a.setItem(this.prefix + key, value);
this.eventBus.emit(DATA_EVENTS.DataChanged, {
provider: this.name,
});
}
}