ESLint v8.x end-of-life is 2024-10-05 and will not be maintained after that. Upgrade or consider long-term support options

ESLint v9.9.0 released

We just pushed ESLint v9.9.0, which is a minor release upgrade of ESLint. This release adds some new features and fixes several bugs found in the previous release.

Highlights

Here are some of the key changes in this release.

Experimental TypeScript configuration files

Arya Emami landed experimental support for TypeScript configuration files. Specifically, you can now use eslint.config.ts, eslint.config.mts, and eslint.config.cts files as your configuration files. Because this feature is experimental, you’ll need to use the unstable_ts_config feature flag:

npx eslint --flag unstable_ts_config

For Node.js, you’ll need to manually install jiti, which provides the TypeScript-to-JavaScript functionality; for Deno and Bun, no additional dependency is necessary. (When TypeScript type stripping lands as stable in Node.js, you also won’t need an additional dependency in Node.js)

For more information on this feature, see TypeScript Configuration Files. For more information on using feature flags, see Feature Flags.

Other notable changes

The require-await rule now suggests to remove possibly unnecessary usages of the async keyword.

Features

Documentation

  • 9fe068c docs: how to author plugins with configs that extend other configs (#18753) (Alec Gibson)
  • 48117b2 docs: add version support page in the side navbar (#18738) (Amaresh S M)
  • fec2951 docs: add version support page to the dropdown (#18730) (Amaresh S M)
  • 38a0661 docs: Fix typo (#18735) (Zaina Al Habash)
  • 3c32a9e docs: Update yarn command for creating ESLint config (#18739) (Temitope Ogunleye)
  • f9ac978 docs: Update README (GitHub Actions Bot)

Chores

  • 461b2c3 chore: upgrade to @eslint/js@9.9.0 (#18765) (Francesco Trotta)
  • 59dba1b chore: package.json update for @eslint/js release (Jenkins)
  • fea8563 chore: update dependency @eslint/core to ^0.3.0 (#18724) (renovate[bot])
  • aac191e chore: update dependency @eslint/json to ^0.3.0 (#18760) (renovate[bot])
  • b97fa05 chore: update wdio dependencies for more stable tests (#18759) (Christian Bromann)

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