How to use Javascript Registry with Bun?

Using the JavaScript registry in Bun (also known as global state management) is primarily implemented by creating a global object that can be shared across different components or modules. The JavaScript registry is typically used to store application state, such as user information and configuration settings. Below are the steps and examples for implementing the registry in Bun:

Step 1: Create the Registry

First, we create an object to store global state. This is typically done in the main entry file or a dedicated module of the application.

javascript
// registry.js
const registry = {

};

export default registry;

Step 2: Add State Management Functionality

Next, we add methods to the registry for adding, retrieving, and setting state.

javascript
// registry.js
const registry = {

};

export function setItem(key, value) {
  registry[key] = value;
}

export function getItem(key) {
  return registry[key];
}

export function removeItem(key) {
  delete registry[key];
}

export default registry;

Step 3: Use the Registry

Now that the registry is ready, we can import and use it in any module or component of the application.

javascript
// app.js
import { setItem, getItem } from './registry.js';

setItem('username', 'Alice');
console.log(getItem('username')); // Output: Alice

Example: Managing User Sessions

In a typical application, you may need to manage user sessions across multiple pages or components. The registry can be used to store the user's login status and user information.

javascript
// session.js
import { setItem, getItem, removeItem } from './registry.js';

export function logIn(user) {
  setItem('user', user);
}

export function logOut() {
  removeItem('user');
}

export function getUser() {
  return getItem('user');
}

Then, in components that need to handle user sessions, you can use it as follows:

javascript
// loginComponent.js
import { logIn, getUser } from './session.js';

// Assume user is obtained from the login form
logIn({ name: 'Alice', token: 'abc123' });

console.log(getUser()); // Output: { name: 'Alice', token: 'abc123' }

Thus, we have created a simple global registry to manage application state. When developing with Bun, remember to consider Bun's specific performance optimizations and best practices to ensure optimal performance and maintainability.