Standard v16.0.0

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Standard v16.0.0 Release Notes

• We're super excited to announce standard 16!

  🚀 As with every new major release, there are lots of new rules in 16.0.0 designed 🚀 to help catch bugs and make programmer intent more explicit. This release brings 👍 better performance, tons of bug fixes, improved JSX, React ⚛️, and Next.js support!

  ⬆️ When you upgrade, consider running standard --fix to automatically format your code to match the newly added rules.

  🚀 ❤️ If you enjoy StandardJS and want to support future releases, please 👍 support Feross!

  🆕 New features

  • 🐎 🏎 Better performance: the filesystem doesn't need to be traversed multiple times! #1023

    • Massive improvements (on the order of minutes!) for projects with huge folders which are are ignored with .gitignore

  • 👍 🌟 Support the .gitignore ignore syntax from the command line #1117

    • In older versions, the command standard src would not lint the src/ folder
    • Instead, a glob pattern like standard src/**/*.js was required
    • This is now fixed! You can run standard src to lint the src/ folder!

  • 👍 🌟 Support relative paths from the command line in more situations (e.g. standard ../src/*.js) #1384

  • 👕 🌟 New extensions option for linting additional extensions besides .js, .jsx, .mjs, and .cjs

    • Can be configured with the --ext command line flag or in package.json:
    • Example:

    standard --ext .ts
    

    {
      "standard": {
        "extensions": [".ts"]
      }
    }
    

  • 🌟 New cache directory location, respecting XDG_CACHE_HOME preference, with fallback to ~/.cache/standard standard-engine/#214

  🔄 Changed features

  • ⚡️ Update eslint from ~7.11.0 to ~7.12.1

  • ⚡️ Update standard-engine from ^12 to ^14

    • Fix inaccurate --help command which indicates that bundle.js is automatically ignored when it is not anymore standard-engine/#224
    • Remove deglob package and use built-in ESLint folder-traversal support

  • Paths with square brackets (e.g. [ and ]) are no longer skipped #1333

    • This pattern is particularly common in Next.js apps, e.g. blog/[slug].js
    • You may notice new errors in these files since they were not being linted before

  • 👍 Better mono-repo support: Nested node_modules/ folders are ignored by default #1182

  • ✂ Remove eslint-plugin-standard #1316

    • We migrated the remaining no-callback-literal rule into eslint-plugin-node

  🆕 New rules

  ✅ (Estimated % of affected standard users, based on test suite in parens)

  • 👕 Require let or const instead of var (no-var) #633 [75%] [automatic fixing reduces to 11%]
  • 👕 Enforce return statements in Array method callbacks (array-callback-return) #859 [7%]
  • 👕 Disallow empty block statements (no-empty) #796 [2%]
  • 👕 Enforce default parameters to be last (default-param-last) #1414 [1%]
  • 👕 Disallow use of the RegExp constructor in favor of regular expression literals (prefer-regex-literals) #1413 [1%]
  • 👕 Disallow spaces inside of computed keys of class methods, getters and setters (computed-property-spacing) #1416 [0%]
  • 👕 Disallow case NaN, switch(NaN), indexOf(NaN), and lastIndexOf(NaN) (use-isnan) #1429 [0%]
  • 👕 Disallow assigning to imported bindings (no-import-assign) #1412 [0%]

  • 👕 Enforce getter/setter pairs in classes (accessor-pairs) #1415 [0%]

  • 👕 Node: Disallow assignment to exports (node/no-exports-assign) #1400 [0%]

  • 👕 React: Prevent usage of the return value of ReactDOM.render (react/no-render-return-value) #1568 [1%]

  • 👕 React: Prevent usage of deprecated methods (react/no-deprecated) #1572 [1%]

  • 👕 React: Prevent direct mutation of this.state (react/no-direct-mutation-state) #1571 [0%]

  • 👕 React: Prevent usage of findDOMNode (react/no-find-dom-node) #1570 [0%]

  • 👕 React: Prevent usage of isMounted (react/no-is-mounted) #1569 [0%]

  • 👕 React: Prevent using string refs (react/no-string-refs) #1567 [0%]

  • 👕 JSX: Prevent missing parentheses around multiline JSX (react/jsx-wrap-multilines) #710 #1382 (0%)

  • 👕 JSX: Check if shorthand fragment syntax requires a key prop (react/jsx-key) #1575 [0%]

  • 👕 JSX: Prevent passing of children as props (react/no-children-prop) #1574 [0%]

  • 👕 JSX: Prevent using children and dangerouslySetInnerHTML as props at the same time (react/no-danger-with-children) #1573 [0%]

  • 👕 JSX: Prevent invalid characters from appearing in markup (react/no-unescaped-entities) #1566 [0%]

  • 👕 JSX: Enforce JSX value is returned in component render function (react/require-render-return) #1565 [0%]

  • 👕 JSX: Prevent usage of unsafe target='_blank' on any component named Link (react/jsx-no-target-blank) #1576 [0%]

  🔄 Changed rules

  • 😌 Relax rule: JSX: Consider the global scope when checking for defined Components #1115
  • 🚚 Relax rule: JSX: Remove conflicting indentation rule in indent #1499

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