strict-ls

strict-ls is a TypeScript library that enhances LocalStorage usage by providing a simpler API and enforcing strict behavior, such as throwing errors when trying to access non-existent keys.

Features

Simple API:

• A simple and intuitive API for developers to interact with local storage, including methods for setting, getting, updating, and deleting data.

Serialization and Deserialization:

• Automatically handles serialization and deserialization of complex data types such as objects and arrays when storing and retrieving data from local storage.

Namespacing:

• Create a prefix to the data within local storage to prevent naming conflicts with other parts of the application or other applications using local storage or cookies.

Error Handling:

• Improved error handling with customized error messages and formats for a better understanding and handling.

Installation

You can install strict-ls via npm:

npm install strict-ls

Basic Usage

Install the package.

You can create an instance of the Storage class to create a namespace.

Note: This wonderful package automatically serializes objects, numbers, booleans and dates!

// Basic Usage
import { get, set } from 'strict-ls';
set('myKey', { foo: 'bar' });
const value = get('myKey'); // { foo: 'bar' }

set('myBoolean', true);
const bool = get('myBoolean'); // true
// etc

// With namespace
// Note that this will read 'namespace:token'
import LocalStorage from 'strict-ls';

const storage = new LocalStorage('namespace');
const value = storage.get('myKey');

You can remove keys directly with remove(key).

Advanced Usage

This package automatically throws errors for missing keys or empty input. It's a good practice to check if the key exists before accesing to it.

import { exists } from 'strict-ls';

const boolean = exists('myKey');

TypeScript Types

Import

Types can be imported through this way.

import type { GenericItem } from 'strict-ls';

GenericItem

The GenericItem type alias is defined as:

type GenericItem = Record<string, any> | string | number | boolean | Date;

This type allows you to store either a string or an object (in the form of a dictionary) in LocalStorage, ensuring flexibility while maintaining type safety.

Error Handling

The library provides specific error classes for handling LocalStorage errors:

• LocalStorageError: Thrown when trying to set or get a value with an invalid key.
• LocalStorageCheckError: Thrown when trying to access a key that does not exist.

API Reference

LocalStorage

Constructor

• new LocalStorage(namespace?: string): Creates a new LocalStorage instance with an optional namespace.

Methods

• get(key: string): GenericItem: Retrieves the value for a given key.
• set(key: string, value: GenericItem): boolean: Sets a value for a given key.
• exists(key: string): boolean: Checks if a key exists in LocalStorage.
• remove(key: string): boolean: If exists, removes a key and its value from LocalStorage.
• clear(): void: Clears all items from LocalStorage.
• length(): number: Returns the total number of items in LocalStorage.