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ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code. In many ways, it is similar to JSLint and JSHint with a few exceptions:
Prerequisites: Node.js (^18.18.0, ^20.9.0, or >=21.1.0) built with SSL support. (If you are using an official Node.js distribution, SSL is always built in.)
You can install and configure ESLint using this command:
npm init @eslint/config@latest
After that, you can run ESLint on any file or directory like this:
./node_modules/.bin/eslint yourfile.js
After running npm init @eslint/config, you'll have an eslint.config.js (or eslint.config.mjs) file in your directory. In it, you'll see some rules configured like this:
import pluginJs from "@eslint/js";
export default [ pluginJs.configs.recommended, ];
The names "semi" and "quotes" are the names of rules in ESLint. The first value is the error level of the rule and can be one of these values:
"off" or 0 - turn the rule off"warn" or 1 - turn the rule on as a warning (doesn't affect exit code)"error" or 2 - turn the rule on as an error (exit code will be 1)The three error levels allow you fine-grained control over how ESLint applies rules (for more configuration options and details, see the configuration docs).
ESLint adheres to the JS Foundation Code of Conduct.
Before filing an issue, please be sure to read the guidelines for what you're reporting:
Yes. JSCS has reached end of life and is no longer supported.
We have prepared a migration guide to help you convert your JSCS settings to an ESLint configuration.
We are now at or near 100% compatibility with JSCS. If you try ESLint and believe we are not yet compatible with a JSCS rule/configuration, please create an issue (mentioning that it is a JSCS compatibility issue) and we will evaluate it as per our normal process.
No, ESLint and Prettier have different jobs: ESLint is a linter (looking for problematic patterns) and Prettier is a code formatter. Using both tools is common, refer to Prettier's documentation to learn how to configure them to work well with each other.
package.json as devDependencies (or dependencies, if your project uses ESLint at runtime).npm install and all your dependencies are installed.npm view eslint-plugin-myplugin peerDependencies to see what peer dependencies eslint-plugin-myplugin has.Yes, ESLint natively supports parsing JSX syntax (this must be enabled in configuration). Please note that supporting JSX syntax is not the same as supporting React. React applies specific semantics to JSX syntax that ESLint doesn't recognize. We recommend using eslint-plugin-react if you are using React and want React semantics.
ESLint has full support for ECMAScript 3, 5, and every year from 2015 up until the most recent stage 4 specification (the default). You can set your desired ECMAScript syntax and other settings (like global variables) through configuration.
ESLint's parser only officially supports the latest final ECMAScript standard. We will make changes to core rules in order to avoid crashes on stage 3 ECMAScript syntax proposals (as long as they are implemented using the correct experimental ESTree syntax). We may make changes to core rules to better work with language extensions (such as JSX, Flow, and TypeScript) on a case-by-case basis.
In other cases (including if rules need to warn on more or fewer cases due to new syntax, rather than just not crashing), we recommend you use other parsers and/or rule plugins. If you are using Babel, you can use @babel/eslint-parser and @babel/eslint-plugin to use any option available in Babel.
Once a language feature has been adopted into the ECMAScript standard (stage 4 according to the TC39 process), we will accept issues and pull requests related to the new feature, subject to our contributing guidelines. Until then, please use the appropriate parser and plugin(s) for your experimental feature.
ESLint updates the supported Node.js versions with each major release of ESLint. At that time, ESLint's supported Node.js versions are updated to be:
ESLint is also expected to work with Node.js versions released after the Node.js Current release.
Refer to the Quick Start Guide for the officially supported Node.js versions for a given ESLint release.
Open a discussion or stop by our Discord server.
Lock files like package-lock.json are helpful for deployed applications. They ensure that dependencies are consistent between environments and across deployments.
Packages like eslint that get published to the npm registry do not include lock files. npm install eslint as a user will respect version constraints in ESLint's package.json. ESLint and its dependencies will be included in the user's lock file if one exists, but ESLint's own lock file would not be used.
We intentionally don't lock dependency versions so that we have the latest compatible dependency versions in development and CI that our users get when installing ESLint in a project.
The Twilio blog has a deeper dive to learn more.
We have scheduled releases every two weeks on Friday or Saturday. You can follow a release issue for updates about the scheduling of any particular release.
ESLint takes security seriously. We work hard to ensure that ESLint is safe for everyone and that security issues are addressed quickly and responsibly. Read the full security policy.
ESLint follows semantic versioning. However, due to the nature of ESLint as a code quality tool, it's not always clear when a minor or major version bump occurs. To help clarify this for everyone, we've defined the following semantic versioning policy for ESLint:
eslint:recommended is updated and will result in strictly fewer linting errors (e.g., rule removals).eslint:recommended is updated and may result in new linting errors (e.g., rule additions, most rule option updates).According to our policy, any minor update may report more linting errors than the previous release (ex: from a bug fix). As such, we recommend using the tilde (~) in package.json e.g. "eslint": "~3.1.0" to guarantee the results of your builds.
Stylistic rules are frozen according to our policy on how we evaluate new rules and rule changes. This means:
These folks keep the project moving and are resources for help.
The people who manage releases, review feature requests, and meet regularly to ensure ESLint is properly maintained.
 Nicholas C. Zakas |
 Francesco Trotta |
 Milos Djermanovic |
The people who review and implement new features.
 唯然 |
 Nitin Kumar |
The people who review and fix bugs and help triage issues.
 Josh Goldberg ✨ |
 Tanuj Kanti |
Team members who focus specifically on eslint.org
 Amaresh S M |
 Strek |
 Percy Ma |
The following companies, organizations, and individuals support ESLint's ongoing maintenance and development. Become a Sponsor to get your logo on our README and website.
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