v7

[manovotny]

Below is the list of changes in the upcoming release. It will be updated as new commits are made.

• ESLint 8 support!
• Zero-config Next.js linting!
• Zero-config TypeScript linting!

• New rules were added, which could potentially break builds.
• Requires node 12.20.0 or higher.
• Requires eslint 8.7.0 or higher. (Updates to ESlint 8. #175)
• React filename extensions should be .jsx now instead of .js to more explicitly call out which files contain React and which files are pure JavaScript.
  • renamer can be used to aid in this conversion. For example: npx renamer --find js --replace jsx "components/**" --dry-run (remove --dry-run once everything looks good).
  • Probably update your NPM scripts to use eslint . --ext .js,.jsx.
• package.json property ordering for consistency across projects.

• Adds Link as an ESLint shared setting linkComponents.
  • Helps support routing framworks, like Next.js (see eslint-plugin-react's custom link components for more information).
• Adds .json5 and .jsonc as supported extensions.
• Adds automatic disabling of unicorn/no-null if GraphQL is used. (Conditionally enable / disable no-null based on presence of graphql #154)
• Adds plugins.
  • eslint-plugin-jest-formatting (Consider adding eslint-plugin-jest-formatting #145)
  • eslint-plugin-jsonc
  • eslint-plugin-next (Consider adding eslint-plugin-next #142)
  • @typescript-eslint/eslint-plugin (Add TypeScript support #176)
• Adds rules.
  • eslint/dot-location
  • eslint/dot-notation
  • eslint/no-multi-assign
  • eslint/no-unused-private-class-members
  • eslint/no-void
  • eslint/prefer-object-has-own
  • import/no-import-module-exports
  • import/no-relative-packages
  • jest/prefer-comparison-matcher
  • jest/prefer-equality-matcher
  • jest/prefer-to-be
  • jest/prefer-expect-resolves
  • jest/valid-describe-callback
  • react/no-arrow-function-lifecycle
  • react/no-invalid-html-attribute
  • react/no-namespace
  • react/no-unstable-nested-components
  • unicorn/no-array-method-this-argument
  • unicorn/no-array-reduce (Add a rule to address reduce performance issues #156)
  • unicorn/no-await-expression-member
  • unicorn/no-document-cookie
  • unicorn/no-empty-file (Create or add a rule to error on empty files. #129)
  • unicorn/no-invalid-remove-event-listener
  • unicorn/no-static-only-class
  • unicorn/no-thenable
  • unicorn/no-useless-fallback-in-spread
  • unicorn/no-useless-length-check
  • unicorn/no-useless-promise-resolve-reject
  • unicorn/no-useless-spread
  • unicorn/numeric-separators-style
  • unicorn/prefer-array-flat
  • unicorn/prefer-at
  • unicorn/prefer-code-point
  • unicorn/prefer-export-from
  • unicorn/prefer-json-parse-buffer
  • unicorn/prefer-object-from-entries
  • unicorn/prefer-prototype-methods
  • unicorn/relative-url-style
  • unicorn/require-array-join-separator
  • unicorn/require-number-to-fixed-digits-argument
  • unicorn/require-post-message-target-origin
  • unicorn/template-indent
  • unicorn/prefer-node-protocol
    • Only enabled for node versions 14.18.0 or higher.

• Changes ecmaVersion to latest
  • Saves us from having to manually bump it every year (see ESLint's Parser Options for more information).
• Changes which React rules are enabled if version 17.0.0 or higher.
  • The react/jsx-uses-react and react/react-in-jsx-scope rules will be disabled if React's version is 17.0.0 and above as they are no longer necessary (see Introducing the New JSX Transform for more information).
• Changes rule options.
  • eslint/comma-dangle
    • Adds always-multiline option. Makes git diffs easier to understand.
  • eslint/no-implicit-coercion
    • Adds disallowTemplateShorthand option.
  • eslint-comments/no-unlimited-disable
    • Duplicate of unicorn/no-abusive-eslint-disable.
  • import/no-unresolved
    • Adds caseSensitive and caseSensitiveStrict options.
  • import/order
    • Adds warnOnUnassignedImports option.
  • jest/no-restricted-matchers
    • Removes resolves matcher as it was causing conflicts with jest/valid-expect and jest/prefer-expect-resolves rules.
  • node/prefer-global/buffer
    • Changes always to never based on Node.js documentation.
  • node/prefer-global/process
    • Changes always to never based on Node.js documentation.
  • react/jsx-filename-extension
    • Changes extensions from .js to .jsx to more explicitly call out which files contain React and which files are pure JavaScript.
      • renamer can be used to aid in this conversion. For example: npx renamer --find js --replace jsx "components/**" --dry-run (remove --dry-run once everything looks good).
      • Probably update your NPM scripts to use eslint . --ext .js,.jsx
  • react/jsx-no-target-blank
    • Adds forms option.

• Fixes false positives with import/extensions and mixed CommonJS / ESM usage.
• Fixes false positives with React JSX transform rules for older versions of React.

• Removes plugins.
  • eslint-plugin-json
    • Replaced by eslint-plugin-jsonc, as eslint-plugin-json uses a non-standard preprocessor (it's using vscode-json-languageservice) and currently returns an empty string, which makes it difficult for other plugins to work alongside of it (see Combination with eslint-plugin-prettier azeemba/eslint-plugin-json#38 for more information). eslint-plugin-jsonc uses the standard ESLint parser espree to create compliant, and thus harmonious, AST.
• Removes rules.
  • eslint/lines-between-class-members
    • Messed with the exceptAfterSingleLine option, but ultimately couldn't find a combination we liked, so we're removing it.
  • jest/prefer-to-be-null
    • Replaced by jest/prefer-to-be.
  • jest/prefer-to-be-undefined
    • Replaced by jest/prefer-to-be.
  • jest/valid-describe
    • Replaced by jest/valid-describe-callback.

[bskiff]

@manovotny, I think the engines listed in package.json don't correctly reflect the versions of node that this works on:
#181