React Essential packages

React Packages Overview

Explain about the packages react, react-dom, react-scripts, and web-vitals in React.

In a typical React project, several key packages are commonly used to build and run React applications. Here's an explanation of each of the packages you mentioned:

1. react

• The 'react' package is the core library of React. It provides the necessary APIs and components for building user interfaces in React.
• This package includes components, hooks, and utilities for creating and managing React elements, handling component lifecycle, managing state, and handling events, among other functionalities.
• When building a React application, the 'react' package is a fundamental dependency that must be included in your project.

2. react-dom

• The 'react-dom' package is a companion package to React that provides DOM-specific methods for working with React elements.
• It includes APIs for rendering React components into the DOM, updating the DOM in response to changes in component state or props, and handling events from DOM elements.
• 'react-dom' is used primarily in web applications to interact with the browser's DOM and render React components into the HTML document.

3. react-scripts

• The 'react-scripts' package is a set of scripts and configurations used for bootstrapping, building, and running React applications created with create-react-app (CRA).
• It includes scripts for starting a development server, building production-ready bundles, running tests, and ejecting from the CRA setup to customize webpack configurations.
• 'react-scripts' abstracts away the configuration complexity and provides a simple and streamlined development experience for React developers, especially for beginners or those who don't want to deal with webpack and other build tools directly.

4. web-vitals

• The 'web-vitals' package is a library for measuring and reporting real user experiences on the web.
• It provides functions for measuring key performance metrics such as First Contentful Paint (FCP), Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS).
• 'web-vitals' is often used in combination with other performance monitoring tools to track and improve the performance of web applications, particularly in terms of user-centric metrics.

These packages are essential dependencies in most React projects, with each serving a specific purpose in the development, rendering, and performance optimization of React applications.

Sample package.json

{
  "name": "react-appk",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "react": "^18.3.1",
    "react-dom": "^18.3.1",
    "react-scripts": "5.0.1",
    "web-vitals": "^2.1.4"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  }
}

            

For more information on these packages, refer to the official React documentation.

---

Next: React index.js and index.html