ESLint v9.24.0 released

Highlights

Bulk Suppressions

This release introduces the bulk suppressions feature. This feature allows for enabling new lint rules as "error" without fixing all violations upfront. While the rule will be enforced for new code, the existing violations will not be reported. This way, you can address the existing violations at your own pace.

# Fix all autofixable violations and suppress the remaining ones
eslint --suppress-all --fix

# Fix all autofixable violations, but suppress only violations for <rule-name>
eslint --suppress-rule <rule-name> --fix

This approach prioritizes preventing new violations while providing a clear path to incrementally improve existing code.

You can find all the details in the announcement blog post and the Bulk Supressions documentation page.

Patterns starting with ./

Prior to ESLint v9.24.0, files and ignores patterns that start with ./ were ignored.

As of ESLint v9.24.0, these patterns are treated as relative to the config base path (the location of the config file, or the current working directory if the --config command line option was used). A pattern that starts with ./ is equivalent to the same pattern without the ./ prefix.

// eslint.config.js
export default [

    {
        // Equivalent to `ignores: ["foo.js"]`
        ignores: ["./foo.js"]
    },

    {
        // Equivalent to `files: ["bar/*.js"]`
        files: ["./bar/*.js"],

        rules: {
            "no-undef": "error"
        }
    }

];

TypeScript Syntax Support in Core Rules

As announced in the ESLint v9.23.0 release blog post, we are actively working to add TypeScript syntax support to core rules.

ESLint v9.24.0 introduces full TypeScript syntax support for four more core rules. These rules are:

• init-declarations
• no-array-constructor
• no-dupe-class-members
• no-loss-of-precision

These rules can now be used to lint TypeScript files as well as regular JavaScript. To lint TypeScript code, be sure to use @typescript-eslint/parser, or another compatible parser.

Additionally, the class-methods-use-this rule has two new TypeScript-specific options: ignoreOverrideMethods and ignoreClassesWithImplements.

Node.js Native Loading of TypeScript Configuration Files (Experimental)

If you’re using Node.js >= 22.10.0, you can now use TypeScript configuration files (eslint.config.ts, eslint.config.mts, or eslint.config.cts) without installing jiti. This is possible thanks to the --experimental-strip-types Node.js flag.

Since this feature is still experimental, you must also enable the unstable_native_nodejs_ts_config ESLint flag.

npx --node-options='--experimental-strip-types' eslint --flag unstable_native_nodejs_ts_config

Features

• 556c25b feat: support loading TS config files using --experimental-strip-types (#19401) (Arya Emami)
• 72650ac feat: support TS syntax in init-declarations (#19540) (Nitin Kumar)
• 03fb0bc feat: normalize patterns to handle “./” prefix in files and ignores (#19568) (Pixel998)
• 071dcd3 feat: support TS syntax in no-dupe-class-members (#19558) (Nitin Kumar)
• cd72bcc feat: Introduce a way to suppress violations (#19159) (Iacovos Constantinou)
• 2a81578 feat: support TS syntax in no-loss-of-precision (#19560) (Nitin Kumar)
• 30ae4ed feat: add new options to class-methods-use-this (#19527) (sethamus)
• b79ade6 feat: support TypeScript syntax in no-array-constructor (#19493) (Tanuj Kanti)

Bug Fixes

• b23d1c5 fix: deduplicate variable names in no-loop-func error messages (#19595) (Nitin Kumar)
• fb8cdb8 fix: use any[] type for context.options (#19584) (Francesco Trotta)

Documentation

• f857820 docs: update documentation for --experimental-strip-types (#19594) (Nikolas Schröter)
• 803e4af docs: simplify gitignore path handling in includeIgnoreFile section (#19596) (Thomas Broyer)
• 6d979cc docs: Update README (GitHub Actions Bot)
• 82177e4 docs: Update README (GitHub Actions Bot)
• e849dc0 docs: replace existing var with const (#19578) (Sweta Tanwar)
• 0c65c62 docs: don’t pass filename when linting rule examples (#19571) (Milos Djermanovic)
• 6be36c9 docs: Update custom-rules code example of fixer (#19555) (Yifan Pan)

Build Related

• 366e369 build: re-enable Prettier formatting for package.json files (#19569) (Francesco Trotta)

Chores

• ef67420 chore: upgrade @eslint/js@9.24.0 (#19602) (Milos Djermanovic)
• 4946847 chore: package.json update for @eslint/js release (Jenkins)
• a995acb chore: correct ‘flter’/‘filter’ typo in package script (#19587) (Josh Goldberg ✨)
• b9a5efa test: skip symlink test on Windows (#19503) (fisker Cheung)
• 46eea6d chore: remove Rule & FormatterFunction from shared/types.js (#19556) (Nitin Kumar)
• bdcc91d chore: modify .editorconfig to keep parity with prettier config (#19577) (Sweta Tanwar)
• 7790d83 chore: fix some typos in comment (#19576) (todaymoon)
• 76064a6 test: ignore package-lock.json for eslint-webpack-plugin (#19572) (Francesco Trotta)