eslint-plugin-es-x enhances ESLint with support for modern ECMAScript syntax and features. It provides rules that prevent the use of older JavaScript constructs, encouraging the adoption of modern ES features like nullish coalescing, optional chaining, and more. This plugin helps maintain a consistent codebase that utilizes the latest language advancements, promoting cleaner, more readable, and performant JavaScript code. It's ideal for projects aiming to target modern environments and leverage the improvements offered by recent ECMAScript versions.