xo

• Various fixes to TypeScript integration (#431) 0ea5dbb

Important: We changed the cache structure, so you'll need to delete node_modules/.cache/xo:

$ rm node_modules/.cache/xo

https://github.com/xojs/xo/compare/v0.27.0...v0.27.1

• 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

https://github.com/xojs/xo/compare/v0.26.1...v0.27.0

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

https://github.com/xojs/xo/compare/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

https://github.com/xojs/xo/compare/v0.25.3...v0.26.0

• Temporarily disable the import/order rule 776927f

https://github.com/xojs/xo/compare/v0.25.3...v0.25.4

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

https://github.com/xojs/xo/compare/v0.25.2...v0.25.3

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

https://github.com/xojs/xo/compare/v0.25.1...v0.25.2

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

https://github.com/xojs/xo/compare/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) https://github.com/sindresorhus/eslint-formatter-pretty/commit/7606f986c831fa3a8848fe9f0dbf58f04dc4db3b
• 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

https://github.com/xojs/xo/compare/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. https://github.com/xojs/eslint-config-xo/commit/ea693f32b4875928d410fbbb208152fb527be3d3
• Removed the no-use-before-define rule. It has too many false-positives. https://github.com/xojs/eslint-config-xo/commit/125759704552a56ef1f8d332c9c7a0933307c353

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

https://github.com/xojs/xo/compare/v0.22.0...v0.23.0

Highlights

• Upgraded to ESLint 5.
• Removed some patterns from the list of default ignores. They were too opinionated. https://github.com/xojs/xo/commit/00d6b7c780e01401bf0357d0c188aa2eb34f78aa https://github.com/xojs/xo/commit/8e4f4355c4b8e62bc28f37e3673bb6872e693bb0
  • fixture{-*,}.{js,jsx}
  • fixture{s,}/**
  • {test,tests,spec,__tests__}/fixture{s,}/**
  • **/bundle.js
• Added support for TypeScript and documented usage with Flow. https://github.com/xojs/xo/commit/957b0d9f433462289d2af5fe94032fddef87a8c7
• Now respects nodeVersion option set in an override block. https://github.com/xojs/xo/commit/98dee9a44aaf2a07f53740f09eeded7931762db7
• Fixed the CLI's --space option parsing. https://github.com/xojs/xo/commit/f76c90107bc52d7be664867a276d735d54ae8c35

New rules

• no-misleading-character-class
• require-atomic-updates
• no-async-promise-executor
• ava/no-import-test-file

All changes

https://github.com/xojs/xo/compare/v0.21.1...v0.22.0

Fix space/useTabs conflict message with Prettier. https://github.com/xojs/xo/commit/36f7f38f3c2f495283cda764c68cfee9b4494973

Highlights

• Dropped support for Node.js 4 and 5 as they reached end of life. Node.js 6 is the minimum required version.
• Upgrade to Prettier 1.12.1.
• The default value for trailingComma Prettier option is now none. https://github.com/xojs/xo/commit/f67ff58c7cafcc7e5ebacbd311532c6886f1063a
• Disable unicorn/number-literal-case when using Prettier to avoid conflict. https://github.com/xojs/xo/commit/4fd6991444e3faeb39a60112e629b77542d80865
• Ignore prettier-ignore comments in capitalized-comments rule. https://github.com/xojs/eslint-config-xo/commit/6e417ff8c04fa7bbcabc6340c125ec524e101ae0
• Fix missed detection of incorrect indentation with indent rule. https://github.com/xojs/eslint-config-xo/commit/145993e8e0297b8af3cfd938bbf586b9d541befe
• Allow named function in prefer-arrow-callback. https://github.com/xojs/eslint-config-xo/commit/bda02cb977a973033257448b920d637b5c29ada9

New rules

• valid-jsdoc
• promise/no-new-statics
• promise/valid-params
• import/no-self-import
• import/no-useless-path-segments

Removed rules

• import/prefer-default-export

This release is way overdue, so glad to finally have it out! It includes a major ESLint upgrade, huge performance improvements, Prettier support, lots of new rules, and bug fixes.

The project was recently moved to a GitHub organization, and we got a new team member, Pierre Vanduynslager ✨

We now also have configs for TypeScript (using tslint) and CSS & Sass (using stylelint). And don't forget, we already have a config for React.

Many of the new rules in this release are from the eslint-plugin-unicorn plugin, which could use some contributions.

Highlights

• Upgraded to ESLint 4. https://github.com/xojs/xo/commit/a11e288d7227aa55db6df130d42f3593f8474ded
• Added optional Prettier support. https://github.com/xojs/xo/commit/fd89175682810fe2a4ec8d10c3f3104d31ed37f1
• Improved performance. https://github.com/xojs/xo/commit/552cbb15cd69ce3c9192fb7dddcd8883d0f2e3bf
• Now toggles rules based on the engines field in package.json. https://github.com/xojs/xo/commit/0d1836816fbc2a223c33aa2b8378719ef7da3eb2
• Disabled linebreak-style rule on Windows. https://github.com/xojs/eslint-config-xo/commit/3f8179657736c4c078759416509ca9698e5321e6
• Made the spaced-comment rule more lenient. https://github.com/xojs/eslint-config-xo/commit/e4f1f36531eefb7dfc58d772747ddb5e9c141a4a
• Now allows _ as argument name in the no-unused-vars rule. https://github.com/xojs/eslint-config-xo/commit/dda366b13a6ad50d38f807bd1d347e90ab91444e
• The --open flag now opens errors first and not warnings. https://github.com/xojs/xo/commit/6f6a606af2f91db377257c5f83b921ef6d25f3dc
• Removed deprecated --compact CLI flag. https://github.com/xojs/xo/commit/652a6e51a8812e1d573c55159d8f55794e97b870
• Excluded babel-register and babel-polyfill from the no-unassigned-import rule. https://github.com/xojs/xo/commit/70d6ab4015d182231eca46dc9b1b512e506a38b4
• Sets ecmaVersion to 2018. 9859dfb

New rules

22 new rules!

• semi-style https://github.com/xojs/eslint-config-xo/commit/0b1680e5b6c5848d96150e774ff7da785bf480a5
• for-direction https://github.com/xojs/eslint-config-xo/commit/c957c7f3e0a34866816d339ac714d82e4c225c4c
• switch-colon-spacing https://github.com/xojs/eslint-config-xo/commit/c1c8fc7f63c8f41d09a77078a6917c21e088d11c
• no-buffer-constructor https://github.com/xojs/eslint-config-xo/commit/ee366cbdf63b34cd43c01c6542d98e1cb9eb78bf
• getter-return https://github.com/xojs/eslint-config-xo/commit/40e1442d18e16eedfaf3a773ccf1c6a137780bf1
• function-paren-newline https://github.com/xojs/eslint-config-xo/commit/9e90fdc3bef013d6a85a1afd59d4b8088a62ad7a
• lines-between-class-members https://github.com/xojs/eslint-config-xo/commit/c7f63cde323d98ffea20d7b3d411ead57fc9799f
• array-bracket-newline https://github.com/xojs/eslint-config-xo/commit/e2f374818e91cea854864c0e42e839edb9d306b2
• unicorn/prefer-add-event-listener
• unicorn/prefer-spread rule
• unicorn/no-unsafe-regex
• unicorn/error-message
• unicorn/import-index
• unicorn/new-for-builtins
• unicorn/regex-shorthand
• unicorn/escape-case
• unicorn/no-hex-escape
• promise/no-return-wrap https://github.com/xojs/xo/commit/4273f8aa24b4c4dc2383d64e53d496f2e020481f
• promise/no-return-in-finally https://github.com/xojs/xo/commit/4273f8aa24b4c4dc2383d64e53d496f2e020481f
• node/no-unpublished-bin https://github.com/xojs/xo/commit/16fb8e2fee3a1176aa04fda058e9a02b358719b1
• node/process-exit-as-throw https://github.com/xojs/xo/commit/16fb8e2fee3a1176aa04fda058e9a02b358719b1
• node/no-deprecated-api https://github.com/xojs/xo/commit/16fb8e2fee3a1176aa04fda058e9a02b358719b1

All changes

https://github.com/sindresorhus/xo/compare/v0.18.2...v0.20.0

Why is this not 0.19.0? That version got tainted by an incorrect publish a long time ago.

We finally fixed all the gitignore issues. Thanks to hard work by @marionebl and @schnittstabil.

The --open flag now also supports VS Code.

https://github.com/sindresorhus/xo/compare/v0.18.1...v0.18.2

Removes the promise/no-promise-in-callback and promise/no-callback-in-promise rules. They were more annoying than useful. You usually have to deal with a lot of non-Promise APIs, so I had to disable it too many times. Some APIs will also never be Promise, like events and streams. https://github.com/sindresorhus/xo/commit/225385202277d1e3c34f14582f9e96225df37e45

https://github.com/sindresorhus/xo/compare/v0.18.0...v0.18.1

Highlights

• The esnext option is now true by default. This means it now enforces the use of as much ES2015+ syntax as Node.js 4 supports. https://github.com/sindresorhus/xo/commit/61c046cab3d908c4c0582211d215e4c7f0d7cf20
• 21 new rules:
  • Unicorn plugin: https://github.com/sindresorhus/eslint-plugin-unicorn/compare/v1.0.0...v2.1.0
    • no-array-instanceof
    • no-new-buffer
    • no-hex-escape
    • number-literal-case
    • escape-case
    • prefer-starts-ends-with
    • custom-error-definition
    • type-error
  • AVA plugin: https://github.com/avajs/eslint-plugin-ava/commit/a0156f19d6b968ffb47d61e53c613ac8665b2428
    • no-async-fn-without-await
    • no-duplicate-modifiers
  • Promise plugin: https://github.com/sindresorhus/xo/commit/3e1a31898b4121a0d155e4a7e042cd796005e795
    • no-promise-in-callback
    • no-callback-in-promise
  • ESLint: https://github.com/sindresorhus/eslint-config-xo/compare/v0.17.0...v0.18.0
    • func-name-matching
    • no-compare-neg-zero
    • template-tag-spacing
    • no-multi-assign
    • prefer-promise-reject-errors
    • no-await-in-loop
    • capitalized-comments
    • no-return-await
    • no-useless-return
• 27 additional ESLint rules are now auto-fixable with $ xo --fix.
• Handle negative gitignore patterns correctly. https://github.com/sindresorhus/xo/commit/f8e1e3da4858af46a3e9085774fda2e6e96a1066
• Vim plugin for XO.
• Added --stdin-filename CLI flag. https://github.com/sindresorhus/xo/commit/0d88cde7e860d55347c40363f8b8985d67b79026
• Added support for auto-fixing code from stdin. https://github.com/sindresorhus/xo/commit/6d6d6427958dfcfe5359b8e25b2adb8e9c1edc4b
• Added tip on how to use XO with monorepos. https://github.com/sindresorhus/xo/commit/cb63c5f3a3a27b79034b619f0915158abbefc90f
• Removed the import/no-dynamic-require rule. https://github.com/sindresorhus/xo/commit/29a5263742f31109cd3fdfd19eb4b3ea0d27de4b
• Ignores directories when receiving an empty extension. https://github.com/sindresorhus/xo/commit/a0ae2484c6f0d5001e6888f0be4b13d81ae55fa8
• Don't trigger import duplication errors for Flow type imports. https://github.com/sindresorhus/xo/commit/da188e5ceb4486f3034a5bdb5c087f99fd18f48d

All changes

https://github.com/sindresorhus/xo/compare/v0.17.1...v0.18.0

Check out the new feature highlight on what makes XO awesome.

Also excited to share that Hyper.app is now using XO \o/

Highlights

• Dropped support for Node.js 0.10 and 0.12 as ESLint did it and we had to follow. https://github.com/sindresorhus/xo/commit/c9b9b8431e6d0383d7c42a2e9d9ac3aff08a45c6
• Many new rules (25 in total!) and changes to existing ones:
  • ESLint: https://github.com/sindresorhus/eslint-config-xo/compare/v0.15.0...v0.17.0
  • Unicorn plugin: https://github.com/sindresorhus/eslint-plugin-unicorn/compare/v0.5.0...v1.0.0
  • AVA plugin: https://github.com/avajs/eslint-plugin-ava/compare/v2.0.0...v3.1.0
  • Import plugin: https://github.com/sindresorhus/xo/commit/e8b0a30eb9f27f73e95e118ef1e1e8a3dacb12f9
• 25 additional ESLint rules are now auto-fixable with $ xo --fix. Try it out when upgrading!(If you want to convert ES5 syntax to ES6, you might want to run it with $ xo --fix --esnext)
• Removed babel-eslint as ESLint now supports async/await. See the parser option if you still need it, and ensure you have babel-eslint in devDependencies. https://github.com/sindresorhus/xo/commit/04733f1724a74c494458754d4982de53cdc30eeb
• Now ignores paths from .gitignore. https://github.com/sindresorhus/xo/commit/fa99f36494550d967e115b3730d2ca4508f6f038
• Added --quiet CLI flag. https://github.com/sindresorhus/xo/commit/bb76a2d28817a176056c2da37f09112810643b4a
• Added extension option. https://github.com/sindresorhus/xo/commit/3c428474cd51579ed55ac94f8e9a467cd48fe9ac
• Added settings option. https://github.com/sindresorhus/xo/commit/85c609413060f463911a3abdee24c280ed177c9c
• Added parser option. https://github.com/sindresorhus/xo/commit/85c609413060f463911a3abdee24c280ed177c9c
• Added abiliy to skip a package.json file and continue looking for XO config. https://github.com/sindresorhus/xo/commit/8933f5104e11fa9db60b49098e55de8ee62bcd3b
• Considerable less amount of dependencies resulting in faster install and taking up less diskspace.

All changes

https://github.com/sindresorhus/xo/compare/v0.16.0...v0.17.0