DEV Community

Turing
Turing

Posted on

2

ESlint 9

ESLint 9 is the latest major version of the popular JavaScript linter, ESLint, released to bring significant improvements, new features, and some breaking changes. With each major version, ESLint enhances performance, provides new configuration options, and updates rule behaviors to help developers catch bugs, enforce consistent code style, and maintain code quality.

In version 9, ESLint has introduced the Flat Config system as the default way to configure ESLint, moving away from the older .eslintrc file format. Flat Config aims to streamline configuration by providing a single configuration file format, eslint.config.js, and simplifying rule, plugin, and parser management. Other improvements include native support for ECMAScript modules (ESM), optimized file matching, and improved defaults to support modern JavaScript development patterns.

Key changes in ESLint 9:

Flat Config as the default: Simplifies configuration with eslint.config.js as the single format.
Better default settings: Supports newer JavaScript syntax by default, like ECMAScript latest version and ESM.

Improved plugin and rule management: Makes it easier to set up and use ESLint with various plugins and rule sets.

Performance improvements: Faster linting, especially in large projects.

These updates make ESLint 9 a more streamlined tool for developers who work with modern JavaScript, improving both ease of setup and performance.

Sentry workshop image

Sick of your mobile apps crashing?

Let Simon Grimm show you how to fix them without the guesswork. Join the workshop and get to debugging.

Save your spot →

Top comments (0)

Image of Wix Studio

2025: Your year to build apps that sell

Dive into hands-on resources and actionable strategies designed to help you build and sell apps on the Wix App Market.

Get started

👋 Kindness is contagious

Dive into an ocean of knowledge with this thought-provoking post, revered deeply within the supportive DEV Community. Developers of all levels are welcome to join and enhance our collective intelligence.

Saying a simple "thank you" can brighten someone's day. Share your gratitude in the comments below!

On DEV, sharing ideas eases our path and fortifies our community connections. Found this helpful? Sending a quick thanks to the author can be profoundly valued.

Okay