ESLint has rolled out two consecutive release candidates for version 10.0.0, introducing important changes and improvements as the team gears up for the full release.
The first release candidate, ESLint v10.0.0-rc.1, introduced built-in TypeScript type definitions for the Espree and ESLint Scope packages. This update replaces the existing definitions from Definitely Typed, streamlining user experience and reducing dependency complexities. Additional significant updates include fixes to the <code>no-shadow</code> rule particularly affecting function and class expression names, alongside improvements to the RuleTester tool.
The subsequent release, ESLint v10.0.0-rc.2, focused on addressing a regression issue in the <code>strict</code> rule’s global mode report range. It also removed the fake FlatESLint and LegacyESLint exports, which were previously available through the ‘use-at-your-own-risk’ entrypoint. Other updates include upgrading the <code>esquery</code> library and enhancing documentation for better guidance.
A migration guide accompanies both releases, providing assistance for users during the upgrade process, although most should transition seamlessly without requiring significant build changes. Users eager to test these updates can install the pre-releases via npm using the ‘next’ tag or by specifying the version directly.
These efforts mark significant steps towards a stable release, ensuring users benefit from the latest enhancements in ESLint’s tooling and ecosystem.

Collections

ESLint v10.0.0 release candidates introduce built-in TypeScript type definitions for Espree and ESLint Scope packages, replacing Definitely Typed dependencies. RC.1 includes fixes to the no-shadow rule for function and class expressions, plus RuleTester improvements. RC.2 addresses a regression in the strict rule's global mode and removes fake FlatESLint/LegacyESLint exports. A migration guide is available, though most users should upgrade seamlessly.

ESLint v10.0.0 Release Candidates Bring Key Fixes and Improvements