checkRequirements() {
    try {
      let store;

      if (typeof localforage_default.a === "undefined") {
        store = localforage_default.a;
      }

      this.storage = store.createInstance({
        name: this.name
      });
    } catch (e) {
      throw new Error("localForage lib not loaded");
    }
  }
Checks to see if localForage exists in global namspace,
Requires localForage if it isn't there
@private