module.exports = { extends: 'airbnb-base', parser: '@babel/eslint-parser', parserOptions: { requireConfigFile: false }, env: { browser: true, node: true, }, settings: { 'import/ignore': ['node_modules', '.(scss|css)$', '.(jpe?g|png|gif|svg)'], }, rules: { /** * Possible Errors * http://eslint.org/docs/rus/#possible-errors */ // Allow dangling commas for multiline arrays and objects // http://eslint.org/docs/rules/comma-dangle 'comma-dangle': [1, 'only-multiline'], // Warn against use of console for non-error logging // http://eslint.org/docs/rules/no-console 'no-console': [1, { allow: ['error'] }], // Allow use of Object.prototypes builtins directly // http://eslint.org/docs/rules/no-prototype-builtins 'no-prototype-builtins': [0], /** * Best Practices * http://eslint.org/docs/rules/#best-practices */ // Allow else clauses after an if with a return // http://eslint.org/docs/rules/no-else-return 'no-else-return': [0], // Disallow reassignment of function parameters (but allow assigning to parameter's properties) // http://eslint.org/docs/rules/no-param-reassign.html 'no-param-reassign': [2, { props: false }], /** * Variables * http://eslint.org/docs/rules/#variables */ // Disallow use of variables and classes before they are defined // http://eslint.org/docs/rules/no-use-before-define 'no-use-before-define': [2, { functions: false, classes: true }], // Disallow declaration of variables that are not used in the code, unless they are prefixed by // `ignored` (useful for creating subset objects through destructuring and rest objects) // http://eslint.org/docs/rules/no-unused-vars 'no-unused-vars': [ 2, { vars: 'local', args: 'after-used', varsIgnorePattern: 'ignored.+', }, ], /** * Stylelistic Issues * (http://eslint.org/docs/rules/#stylistic-issues) */ // Enforce 4-space indents, except for switch cases // http://eslint.org/docs/rules/indent indent: [2, 4, { SwitchCase: 1, VariableDeclarator: 1 }], // Specify the maximum length of a code line to be 100 // http://eslint.org/docs/rules/max-len 'max-len': [ 2, { code: 105, // Use 105 to give some leeway for *just* slightly longer lines when convienient ignorePattern: '^(import|export) .* from .*$', ignoreComments: false, ignoreTrailingComments: true, ignoreUrls: true, }, ], // Require capitalization when using `new`, but don't require capitalized functions to be called // with new // http://eslint.org/docs/rules/new-cap 'new-cap': [2, { newIsCap: true, capIsNew: false }], // Allow the continue statement // http://eslint.org/docs/rules/no-continue 'no-continue': [0], // Disallow un-paren'd mixes of different operators if they're not of the same precendence // http://eslint.org/docs/rules/no-mixed-operators 'no-mixed-operators': [ 2, { groups: [ ['+', '-', '*', '/', '%', '**'], ['&', '|', '^', '~', '<<', '>>', '>>>'], ['==', '!=', '===', '!==', '>', '>=', '<', '<='], ['&&', '||'], ['in', 'instanceof'], ], allowSamePrecedence: true, }, ], // Allow use of unary increment/decrement operators // http://eslint.org/docs/rules/no-plusplus 'no-plusplus': [0], // Always allow dangling underscores // http://eslint.org/docs/rules/no-underscore-dangle 'no-underscore-dangle': [0], // Require unix-style line breaks // http://eslint.org/docs/rules/linebreak-style 'linebreak-style': [2, 'unix'], // Require operators to always be at the end of a line, except for the ternary operator // http://eslint.org/docs/rules/operator-linebreak 'operator-linebreak': [ 2, 'after', { overrides: { '?': 'ignore', ':': 'ignore' } }, ], // Require properties to be consistently quoted. Force numbers to be quoted, as they can have // weird behaviour during the coercion into a string) // http://eslint.org/docs/rules/quote-props 'quote-props': [ 2, 'consistent', { keywords: false, unnecessary: true, numbers: true }, ], // Require spaces before parens for anonymous function declarations // http://eslint.org/docs/rules/space-before-function-paren 'space-before-function-paren': [2, { anonymous: 'always', named: 'never' }], // Require a space immediately following the // or /* in a comment for most comments // http://eslint.org/docs/rules/spaced-comment 'spaced-comment': [ 2, 'always', { line: { exceptions: ['-', '+'], }, block: { exceptions: ['*'], }, }, ], // We don't like semicolons so kill them // http://eslint.org/docs/rules/semi semi: [2, 'never'], /** * Import rules * https://github.com/benmosher/eslint-plugin-import#rules */ // Ensure named imports coupled with named exports // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/named.md#when-not-to-use-it 'import/named': 2, // Ensure default import coupled with default export // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/default.md#when-not-to-use-it 'import/default': 2, // Disallow namespace (wildcard) imports // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-namespace.md 'import/no-namespace': 2, // Enforce imports to not specify a trailing .js extension // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/extensions.md 'import/extensions': [2, { js: 'never' }], // Enforce module import order: builtin -> external -> internal // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/order.md 'import/order': [ 2, { groups: [ 'builtin', 'external', ['internal', 'parent', 'sibling', 'index'], ], }, ], /** * ES6-specific Issues * (http://eslint.org/docs/rules/#ecmascript-6) */ // Don't require parens in arrow function arguments // http://eslint.org/docs/rules/arrow-parens 'arrow-parens': [0], // Ignore built-in import sorting for eslint-plugin-import's version // http://eslint.org/docs/rules/sort-imports 'sort-imports': [0], 'arrow-body-style': [0], 'arrow-parens': [0], 'arrow-spacing': [0], 'constructor-super': [0], 'generator-star-spacing': [0], 'no-class-assign': [0], 'no-confusing-arrow': [0], 'no-const-assign': [0], 'no-dupe-class-members': [0], 'no-duplicate-imports': [0], 'no-new-symbol': [0], 'no-restricted-imports': [0], 'no-this-before-super': [0], 'no-useless-computed-key': [0], 'no-useless-constructor': [0], 'no-useless-rename': [0], 'no-var': [0], 'object-shorthand': [0], 'prefer-arrow-callback': [0], 'prefer-const': [0], 'prefer-reflect': [0], 'prefer-rest-params': [0], 'prefer-spread': [0], 'prefer-template': [0], 'require-yield': [0], 'rest-spread-spacing': [0], 'sort-imports': [0], 'template-curly-spacing': [0], 'yield-star-spacing': [0], }, };