• Add TypeScript support (#426) b0dfcbd
  You can now lint TypeScript projects without any extra config. You can also lint d.ts files in JS projects. Read more.
• Find XO config based on linted file path (#425) e0f81a7
• Fix overrides handling for extends, envs, globals, plugins (#429) 4cefdbc
• Add node/no-unsupported-features rules (#341) 2297c07
• Improve import/no-unassigned-import settings (#430) 0c78113

v0.26.1...v0.27.0

• Use new eslint-config-prettier override (#422) 9fbdb97

v0.26.0...v0.26.1

Breaking

• Require Node.js 10 d7fa875
• Move $ xo --init to $ npm init xo 6463dfe

New rules

20 new rules 👌

ESLint

• default-param-last
• function-call-argument-newline
• grouped-accessor-pairs
• no-constructor-return
• no-dupe-else-if
• no-import-assign
• no-setter-return
• no-useless-catch
• prefer-exponentiation-operator
• prefer-named-capture-group
• prefer-object-spread
• prefer-regex-literals

Unicorn

• unicorn/prefer-modern-dom-apis
• unicorn/prefer-negative-index
• unicorn/prefer-replace-all
• unicorn/prefer-string-slice
• unicorn/prefer-trim-start-end

Other

• node/prefer-global/url-search-params
• node/prefer-global/url
• promise/prefer-await-to-then

Enhancements

• Set the es2020 environment by default eb5ea2c

Fixes

• Fix compatibility with being run in a child process (#405) 08af7c1

v0.25.3...v0.26.0

• Temporarily disable the import/order rule 776927f

v0.25.3...v0.25.4

• Enable unicorn/prefer-flat-map only for Node.js >=11 (#403) 80c592e

v0.25.2...v0.25.3

• Disable no-nested-ternary rule when Prettier is used (#402) 537ef66

v0.25.1...v0.25.2

• Don't report normal TODO comments as errors 4378e83

v0.25.0...v0.25.1

Breaking

• Require Node.js 8 8a213ef
• Upgrade to ESLint 6 698b043
• Enforce using the .json extension for JSON files in imports 7e56730

New rules

• Add prefer-named-capture-group rule (for Node.js >=10 target) 21e7b57
• Add default-param-last rule
• Add prefer-regex-literals rule
• Add no-import-assign rule
• Add unicorn/expiring-todo-comments rule
• Add unicorn/no-nested-ternary rule
• Add unicorn/prefer-reflect-apply rule
• Add unicorn/prefer-string-slice rule
• Add unicorn/prefer-dataset rule
• Add unicorn/no-for-loop rule
• Add unicorn/no-zero-fractions rule
• Add unicorn/prefer-includes rule
• Add unicorn/prefer-text-content rule
• Add unicorn/prefer-node-remove rule
• Add unicorn/prefer-event-key rule
• Add unicorn/prefer-flat-map rule
• Add node/prefer-promises/fs rule a3d74a6
• Add node/prefer-promises/dns rule 8f8fc94

Enhancements

• Respect .eslintignore (#377) f6bf4c0
• Turn all paths cwd-relative before linting (#372) 3033fcd
• Add option to import/no-useless-path-segments rule 8d6c5c5
• Add tap-snapshots/*.js to default ignore list (#385) b73b11b
• Make --stdin --fix always return the code even if nothing was fixed (#383) ec51d18

Highlights

• You can now click/Command-click the rule IDs in the output to open the rule's docs. Preview. (Only in supported terminals) sindresorhus/eslint-formatter-pretty@7606f98
• Move default ESLint cache to node_modules/.cache/xo. (#351) d1fd3e1
• Support parsing ES2019 61f9582
• Drop support for Babel 6 in the import/no-unassigned-import rule dd2c015

New rules

• padding-line-between-statements
• no-useless-catch
• unicorn/prefer-query-selector
• unicorn/prefer-node-append
• unicorn/no-unreadable-array-destructuring
• unicorn/no-console-spaces
• eslint-comments/disable-enable-pair
• eslint-comments/no-aggregating-enable
• eslint-comments/no-duplicate-disable
• eslint-comments/no-unused-disable
• eslint-comments/no-unused-enable
• node/prefer-global/buffer
• node/prefer-global/console
• node/prefer-global/process
• node/prefer-global/text-decoder (When targeting Node.js 11)
• node/prefer-global/text-encoder (When targeting Node.js 11)
• node/prefer-global/url-search-params (When targeting Node.js 10)
• node/prefer-global/url (When targeting Node.js 10)

All changes

v0.23.0...v0.24.0

Highlights

• In v0.22.0, we added support for .ts and .tsx extensions by default. This caused a lot of problems for non-TS projects, so it has been reverted pending a better solution.
• The quotes rule is now set to disallow using template literals when you're not using any interpolation. xojs/eslint-config-xo@ea693f3
• Removed the no-use-before-define rule. It has too many false-positives. xojs/eslint-config-xo@1257597

New rules

• require-await
• unicorn/prefer-exponentiation-operator
• unicorn/catch-error-name (See this thread if you're wondering why error is preferred over err) (Sorry about the churn, but this is an important milestone towards more readable code. Code is written once but read many times. We should optimize for the latter.)

All changes

v0.22.0...v0.23.0