v19.0.0

Added

• shopify/jest config with eslint-plugin-jest rules:
  • jest/no-disabled-tests (disabled)
  • jest/no-focused-tests
  • jest/no-identical-title
  • jest/no-large-snapshots (limited to 12 lines)
  • jest/prefer-to-have-length
  • jest/prefer-to-be-null
  • jest/prefer-to-be-undefined
  • jest/valid-expect
• Added shopify/webpack config
• Added shopify/polaris config
• Added shopify/webpack/no-unnamed-dynamic-imports rule
• Added shopify/prefer-module-scope-constants rule
• Added shopify/jsx-no-complex-expressions rule
• Added shopify/jsx-no-hardcoded-content rule
• Added shopify/polaris-no-bare-stack-item rule
• Added shopify/polaris-prefer-sectioned-prop rule
• Added shopify/react-initialize-state rule
• Added shopify/react-type-state rule
• Added implicit-arrow-linebreak rule
• Added lines-around-comment rule (as a special
  rule).
• Added no-unexpected-multiline rule (as a special rule).
• Added flowtype/no-flow-fix-me-comments
• Added react/jsx-one-expression-per-line
• Added react/destructuring-assignment
• Added react/no-access-state-in-setstate
• Added react/button-has-type
• Added react/jsx-curly-brace-presence
• Added typescript/member-naming
• Added typescript/no-array-constructor
• Added yarn prettier script (prettifies source files)

Changed

• Updated dependencies to their latest versions (full details in #63)

• Breaking: node.js minimum supported node version update to 8.9.4 (LTS).

• Breaking: Changed eslint-config-shopify codebase to trailingComma: 'all' and drop support for Node.js 6

• Breaking: Updated prettier to 1.9.2, introducing a change in function parens style (set to arrowParens: 'always'):

  // Before
  const foo = myArray.map(foo => {});
  
  // After
  const foo = myArray.map((foo) => {});

  ⚠️ Upgrade path

  Your project config files (package.json, .prettierrc, .eslintrc…)
  may need to be updated like so:

     "singleQuote": true,
     "bracketSpacing": false,
     "trailingComma": "all",
  +  "arrowParens": "always"

• Prettified source files using the new config