.eslintrc.js
/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
// Inspired by https://github.com/airbnb/javascript but less opinionated.
// We use eslint-loader so even warnings are very visibile.
// This is why we only use "WARNING" level for potential errors,
// and we don't use "ERROR" level at all.
// In the future, we might create a separate list of rules for production.
// It would probably be more strict.
module.exports = {
root: true,
parser: 'babel-eslint',
// import plugin is temporarily disabled, scroll below to see why
// plugins: [/*'import', */'flowtype', 'jsx-a11y', 'react'],
plugins: [/*'import', */'flowtype', 'react'], // Disable jsx-a11y until packages are compatible
env: {
browser: true,
commonjs: true,
es6: true,
jest: true,
node: true
},
parserOptions: {
ecmaVersion: 6,
sourceType: 'module',
ecmaFeatures: {
jsx: true,
generators: true,
experimentalObjectRestSpread: true
}
},
settings: {
'import/ignore': [
'node_modules',
'\\.(json|css|jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$',
],
'import/extensions': ['.js'],
'import/resolver': {
node: {
extensions: ['.js', '.json']
}
}
},
rules: {
// http://eslint.org/docs/rules/
'array-callback-return': 'warn',
'default-case': ['warn', { commentPattern: '^no default$' }],
'dot-location': ['warn', 'property'],
eqeqeq: ['warn', 'allow-null'],
'guard-for-in': 'warn',
'new-parens': 'warn',
'no-array-constructor': 'warn',
'no-caller': 'warn',
'no-cond-assign': ['warn', 'always'],
'no-const-assign': 'warn',
'no-control-regex': 'warn',
'no-delete-var': 'warn',
'no-dupe-args': 'warn',
'no-dupe-class-members': 'warn',
'no-dupe-keys': 'warn',
'no-duplicate-case': 'warn',
'no-empty-character-class': 'warn',
'no-empty-pattern': 'warn',
'no-eval': 'warn',
'no-ex-assign': 'warn',
'no-extend-native': 'warn',
'no-extra-bind': 'warn',
'no-extra-label': 'warn',
'no-fallthrough': 'warn',
'no-func-assign': 'warn',
'no-implied-eval': 'warn',
'no-invalid-regexp': 'warn',
'no-iterator': 'warn',
'no-label-var': 'warn',
'no-labels': ['warn', { allowLoop: false, allowSwitch: false }],
'no-lone-blocks': 'warn',
'no-loop-func': 'warn',
'no-mixed-operators': ['warn', {
groups: [
['&', '|', '^', '~', '<<', '>>', '>>>'],
['==', '!=', '===', '!==', '>', '>=', '<', '<='],
['&&', '||'],
['in', 'instanceof']
],
allowSamePrecedence: false
}],
'no-multi-str': 'warn',
'no-native-reassign': 'warn',
'no-negated-in-lhs': 'warn',
'no-new-func': 'warn',
'no-new-object': 'warn',
'no-new-symbol': 'warn',
'no-new-wrappers': 'warn',
'no-obj-calls': 'warn',
'no-octal': 'warn',
'no-octal-escape': 'warn',
'no-redeclare': 'warn',
'no-regex-spaces': 'warn',
'no-restricted-syntax': [
'warn',
'LabeledStatement',
'WithStatement',
],
'no-script-url': 'warn',
'no-self-assign': 'warn',
'no-self-compare': 'warn',
'no-sequences': 'warn',
'no-shadow-restricted-names': 'warn',
'no-sparse-arrays': 'warn',
'no-template-curly-in-string': 'warn',
'no-this-before-super': 'warn',
'no-throw-literal': 'warn',
'no-undef': 'error',
'no-unexpected-multiline': 'warn',
'no-unreachable': 'warn',
'no-unused-expressions': 'warn',
'no-unused-labels': 'warn',
'no-unused-vars': ['warn', {
vars: 'local',
varsIgnorePattern: '^_',
args: 'none'
}],
'no-use-before-define': ['warn', 'nofunc'],
'no-useless-computed-key': 'warn',
'no-useless-concat': 'warn',
'no-useless-constructor': 'warn',
'no-useless-escape': 'warn',
'no-useless-rename': ['warn', {
ignoreDestructuring: false,
ignoreImport: false,
ignoreExport: false,
}],
'no-with': 'warn',
'no-whitespace-before-property': 'warn',
'operator-assignment': ['warn', 'always'],
radix: 'warn',
'require-yield': 'warn',
'rest-spread-spacing': ['warn', 'never'],
//strict: ['warn', 'never'],
'unicode-bom': ['warn', 'never'],
'use-isnan': 'warn',
'valid-typeof': 'warn',
// https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/
// TODO: import rules are temporarily disabled because they don't play well
// with how eslint-loader only checks the file you change. So if module A
// imports module B, and B is missing a default export, the linter will
// record this as an issue in module A. Now if you fix module B, the linter
// will not be aware that it needs to re-lint A as well, so the error
// will stay until the next restart, which is really confusing.
// This is probably fixable with a patch to eslint-loader.
// When file A is saved, we want to invalidate all files that import it
// *and* that currently have lint errors. This should fix the problem.
// 'import/default': 'warn',
// 'import/export': 'warn',
// 'import/named': 'warn',
// 'import/namespace': 'warn',
// 'import/no-amd': 'warn',
// 'import/no-duplicates': 'warn',
// 'import/no-extraneous-dependencies': 'warn',
// 'import/no-named-as-default': 'warn',
// 'import/no-named-as-default-member': 'warn',
// 'import/no-unresolved': ['warn', { commonjs: true }],
// https://github.com/yannickcr/eslint-plugin-react/tree/master/docs/rules
'react/jsx-equals-spacing': ['warn', 'never'],
'react/jsx-no-duplicate-props': ['warn', { ignoreCase: true }],
'react/jsx-no-undef': 'warn',
'react/jsx-pascal-case': ['warn', {
allowAllCaps: true,
ignore: [],
}],
'react/jsx-uses-react': 'warn',
'react/jsx-uses-vars': 'warn',
'react/no-danger-with-children': 'warn',
'react/no-deprecated': 'warn',
'react/no-direct-mutation-state': 'warn',
'react/no-is-mounted': 'warn',
'react/react-in-jsx-scope': 'warn',
'react/require-render-return': 'warn',
'react/style-prop-object': 'warn',
// https://github.com/evcohen/eslint-plugin-jsx-a11y/tree/master/docs/rules
//'jsx-a11y/aria-role': 'warn',
//'jsx-a11y/img-has-alt': 'warn',
//'jsx-a11y/img-redundant-alt': 'warn',
//'jsx-a11y/no-access-key': 'warn',
// https://github.com/gajus/eslint-plugin-flowtype
'flowtype/define-flow-type': 'warn',
'flowtype/require-valid-file-annotation': 'warn',
'flowtype/use-flow-type': 'warn'
}
};