@unifygtm/intent-client/src/client/storage/local-storage.ts

JavaScript client for interacting with the Unify Intent API in the browser.

import StorageService from './storage';
import { isLocalStorageAvailable } from './utils';

/**
 * Storage service class for storing and retrieving data via the
 * browser local storage API. Requires the current browser to
 * support local storage.
 */
export class LocalStorageService extends StorageService {
  private readonly _localStorageAvailable: boolean;

  constructor(writeKey: string) {
    super(writeKey);
    this._localStorageAvailable = isLocalStorageAvailable();
  }

  /**
   * Retrieves an encoded value associated with a key from local storage.
   *
   * @param key - the key associated with the value to retrieve
   * @returns the encoded value from local storage if it exists,
   *          otherwise `null`
   */
  protected retrieveValue = (key: string): string | null => {
    if (this._localStorageAvailable) {
      return localStorage.getItem(key);
    }

    return null;
  };

  /**
   * Stores an encoded value associated with a given key in local storage.
   *
   * @param key - the key associated with the value to store
   * @param encodedValue - the encoded value to store
   */
  protected storeValue = (key: string, encodedValue: string): void => {
    if (this._localStorageAvailable) {
      localStorage.setItem(key, encodedValue);
    }
  };
}