.eslintrc.js

module.exports = {
    env: {
        browser: true,
        node: true,
        jquery: true,
        jasmine: true,
        es6: true
    },
    globals: {
        CMS: true,
        Promise: true,
        __CMS_VERSION__: true
    },
    root: true,
    ecmaFeatures: {
        modules: true
    },
    parser: 'babel-eslint',
    parserOptions: {
        sourceType: 'module'
    },
    plugins: ['compat'],
    settings: {
        polyfills: ['document-currentscript']
    },
    rules: {
        // Possible Errors
        'comma-dangle': [2, 'never'],
        'no-cond-assign': 2,
        'no-console': 1,
        'no-constant-condition': 2,
        'no-control-regex': 2,
        'no-debugger': 2,
        'no-dupe-args': 2,
        'no-dupe-keys': 2,
        'no-duplicate-case': 2,
        'no-empty-character-class': 2,
        'no-empty': ['error', { allowEmptyCatch: true }],
        'no-ex-assign': 2,
        'no-extra-boolean-cast': 2,
        'no-extra-parens': 0,
        'no-extra-semi': 2,
        'no-func-assign': 2,
        'no-inner-declarations': 2,
        'no-invalid-regexp': 2,
        'no-irregular-whitespace': 2,
        'no-negated-in-lhs': 2,
        'no-obj-calls': 2,
        'no-regex-spaces': 2,
        'no-sparse-arrays': 2,
        'no-unexpected-multiline': 2,
        'no-unreachable': 2,
        'use-isnan': 2,
        'valid-jsdoc': [
            2,
            {
                requireReturn: false,
                requireParamDescription: false,
                requireReturnDescription: false,
                prefer: {
                    return: 'returns'
                }
            }
        ],
        'valid-typeof': 2,

        // Best Practices
        'accessor-pairs': 2,
        'block-scoped-var': 2,
        complexity: ['error', { max: 10 }],
        'consistent-return': 0,
        curly: 2,
        'default-case': 2,
        'dot-location': [2, 'property'],
        'dot-notation': 2,
        eqeqeq: 2,
        'guard-for-in': 2,
        'no-alert': 2,
        'no-caller': 2,
        'no-case-declarations': 2,
        'no-div-regex': 2,
        'no-else-return': 1,
        'no-empty-pattern': 2,
        'no-eq-null': 2,
        'no-eval': 2,
        'no-extend-native': 2,
        'no-extra-bind': 2,
        'no-fallthrough': 2,
        'no-floating-decimal': 2,
        'no-implicit-coercion': 0,
        'no-implied-eval': 2,
        'no-invalid-this': 0,
        'no-iterator': 2,
        'no-labels': 2,
        'no-lone-blocks': 2,
        'no-loop-func': 2,
        'no-magic-numbers': [
            'error',
            {
                ignore: [0, -1, 1, 2],
                ignoreArrayIndexes: true
            }
        ],
        'no-multi-spaces': 2,
        'no-multi-str': 0,
        'no-native-reassign': 2,
        'no-new-func': 2,
        'no-new-wrappers': 2,
        'no-new': 0,
        'no-octal-escape': 2,
        'no-octal': 2,
        'no-param-reassign': 2,
        'no-process-env': 0,
        'no-proto': 2,
        'no-redeclare': 2,
        'no-return-assign': 2,
        'no-script-url': 2,
        'no-self-compare': 2,
        'no-sequences': 2,
        'no-throw-literal': 2,
        'no-unused-expressions': [2, { allowShortCircuit: true }],
        'no-useless-call': 2,
        'no-useless-concat': 2,
        'no-void': 2,
        'no-warning-comments': 0,
        'no-with': 2,
        radix: 2,
        'vars-on-top': 0, // FIXME should be enabled at some point
        'wrap-iife': [2, 'inside'],
        yoda: [2, 'never', { exceptRange: true }],

        // Strict Mode
        strict: 0, // not required with webpack

        // Variables
        'init-declarations': 0,
        'no-catch-shadow': 2,
        'no-delete-var': 2,
        'no-label-var': 2,
        'no-shadow-restricted-names': 2,
        'no-shadow': 2,
        'no-undef-init': 2,
        'no-undef': 2,
        'no-undefined': 0,
        'no-unused-vars': 2,
        'no-use-before-define': 2,

        // Stylistic Issues
        'array-bracket-spacing': [2, 'never'],
        'block-spacing': 2,
        'brace-style': [2, '1tbs'],
        camelcase: 0,
        'comma-spacing': [2, { before: false, after: true }],
        'comma-style': [2, 'last'],
        'computed-property-spacing': [2, 'never'],
        'consistent-this': [2, 'that'],
        'eol-last': 2,
        'func-names': 0,
        'func-style': 0,
        'id-length': 0,
        'id-match': 0,
        indent: [
            'error',
            4,
            {
                SwitchCase: 1
            }
        ],
        'jsx-quotes': 0,
        'key-spacing': [2, { beforeColon: false, afterColon: true }],
        'linebreak-style': [2, 'unix'],
        'lines-around-comment': 0,
        'max-nested-callbacks': [2, 5],
        'new-cap': 2,
        'new-parens': 2,
        'newline-after-var': 2,
        'no-array-constructor': 2,
        'no-continue': 2,
        'no-inline-comments': 0,
        'no-lonely-if': 2,
        'no-mixed-spaces-and-tabs': 2,
        'no-multiple-empty-lines': [2, { max: 2 }],
        'no-negated-condition': 2,
        'no-nested-ternary': 2,
        'no-new-object': 2,
        'no-restricted-syntax': 0,
        'no-spaced-func': 0,
        'no-ternary': 0,
        'no-trailing-spaces': 2,
        'no-underscore-dangle': 0,
        'no-unneeded-ternary': 2,
        'object-curly-spacing': [
            2,
            'always',
            {
                objectsInObjects: true,
                arraysInObjects: true
            }
        ],
        'one-var': [2, 'never'],
        'operator-assignment': 2,
        'operator-linebreak': 0,
        'padded-blocks': 0,
        'quote-props': [2, 'as-needed'],
        quotes: [2, 'single', 'avoid-escape'],
        'require-jsdoc': 2,
        'semi-spacing': [2, { before: false, after: true }],
        semi: [2, 'always'],
        'sort-vars': 0,
        'keyword-spacing': 2,
        'space-before-blocks': 2,
        // FIXME reenable after running prettier on full codebase
        'space-before-function-paren': [0, { anonymous: 'never', named: 'never' }],
        'space-in-parens': [2, 'never'],
        'space-infix-ops': 2,
        'space-unary-ops': 2,
        'spaced-comment': 2,
        'wrap-regex': 0,

        // ES6
        'arrow-parens': [2, 'as-needed'],

        // Legacy
        'max-depth': [2, 4],
        'max-len': [2, 120],
        'max-params': [2, 3],
        'max-statements': 0,
        'no-bitwise': 2,
        'no-plusplus': 0,

        'compat/compat': 2
    }
};