Type Safe Storage

A type-safe wrapper around React Native's Async Storage that re-implements the entire API.

Using this library all AsyncStorage API methods provide typescript type-validation for all setters and merges, as well as typed-return values for all getters.

Getting Started

npm i -S @figliolia/type-safe-storage
# or
yarn add @figliolia/type-safe-storage

Basic Usage

import { TypeSafeStorage } from "@figliolia/type-safe-storage";

export const AsyncStorage = new TypeSafeStorage<{
  userID: number;
  username: string;
  friendsList: number[];
  connections: Record<string, number>;
}>();

const userID = await AsyncStorage.getItem("userID");
// number | null

const unknown = await AsyncStorage.getItem("unknown-key");
// Fails typescript validation

const [userID, friendsList] = await AsyncStorage.multiGet([
  "userID",
  "friendsList"
]);
// [number | null, number[] | null]
const [userID, unknown] = await AsyncStorage.multiGet([
  "userID",
  "unknown"
]);
// Fails typescript validation

API

clear

Erases all AsyncStorage for all clients, libraries, etc. You probably don't want to call this; use removeItem or multiRemove to clear only your app's keys.

flushGetRequests

Flushes any pending requests using a single batch call to get the data

getAllKeys

Gets all keys known to your app; for all callers, libraries, etc.

getItem

Fetches an item for a key and invokes a callback upon completion.

mergeItem

Merges an existing key value with an input value, assuming both values are valid JSON.

multiGet

This allows you to batch the fetching of items given an array of key inputs. Your callback will be invoked with an array of corresponding key-value pairs found.

multiMerge

Batch operation to merge in existing and new values for a given set of keys. This assumes that the values are valid JSON.

multiRemove

Deletes each of the keys provided to the method

multiSet

Use this as a batch operation for storing multiple key-value pairs. When the operation completes you'll get a single callback with any errors.

removeItem

Removes an item for a key and invokes the provided callback upon completion.

setItem

Sets the value for a key and invokes the provided callback upon completion.