eslint-formatter-checkstyle

Standalone package extracted from ESLint's built-in checkstyle formatter. Current stable version is 9.0.1, compatible with ESLint 9+. Released as an official standalone package to allow external use without depending on the full ESLint library. Supports Node.js ^18.18.0 || ^20.9.0 || >=21.1.0. Unlike alternative checkstyle formatters from the community, this one is maintained by the ESLint team and ships TypeScript types. Release cadence follows ESLint's major releases as the formatter is derived from ESLint's source.