v1.0.0

Breaking

• Requires ESLint flat config
• Requires Node.js 20.17
• Configuration now only through package.json and xo.config.{js,cjs,mjs,ts,cts,mts} files
• Switched from eslint-plugin-import to eslint-plugin-import-x (since it's better maintained)
  • You will have to update ignore comments and config from import to import-x
• CLI flags removed:
  • --plugin: Configurable via config file
  • --extend: Configurable via config file
  • --global: Configurable via config file
  • --extension: Configurable via config file
  • --env: No longer relevant with new config system
  • --node-version: Removed as it only affected unsupported Node.js versions
  • --reporter: Removed due to potential lookup reliability issues
• Node.js engines check removed
  • Was only active in unsupported Node.js versions
• Webpack lookup and import resolution removed
  • Considered too niche for core functionality

Improvements

• React support
• Prettier compatibility mode with {prettier: 'compat'} option
  • Disables all Prettier-affected stylistic rules, and maintains existing Prettier functionality otherwise
• Enhanced stdin handling:
  • --stdin-filename now optional
  • Supports TypeScript files via stdin

New rules

• @typescript-eslint/no-wrapper-object-types
• @typescript-eslint/no-unsafe-function-type
• @typescript-eslint/no-deprecated
• @stylistic/type-named-tuple-spacing
• @stylistic/type-generic-spacing
• unicorn/consistent-date-clone
• unicorn/no-named-default
• unicorn/consistent-assert
• unicorn/no-instanceof-builtins
• unicorn/no-accessor-recursion
• unicorn/prefer-import-meta-properties
• unicorn/no-unnecessary-array-flat-depth
• unicorn/no-unnecessary-array-splice-count

Thanks

Huge thanks to @spence-s for doing most of the work for this 🎉

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v0.60.0...v1.0.0