.eslintrc.js

module.exports = {
    extends: [
        'eslint:recommended',
    ],
    parser: 'babel-eslint',
    parserOptions: {
        parser: 'babel-eslint',
        ecmaVersion: 2017,
        sourceType: 'module',
        allowImportExportEverywhere: true,
    },
    env: {
        es6: true,
        amd: true,
        node: true,
    },
    ignorePatterns: [
        '.eslintrc.js',
        '**/dist/**/*',
        '**/node_modules/**/*',
    ],
    rules: {
        'indent': ['error', 4, { 'SwitchCase': 1, 'MemberExpression': 1 }],
        'no-trailing-spaces': 'error',
        'linebreak-style': ['error', 'unix'],
        'no-console': process.env.NODE_ENV === 'production' ? [
            'error',
            { 'allow': ['warn', 'error'] },
        ] : 'off',
        'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
        'no-fallthrough': 'off',
        'no-case-declarations': 'off',
        'space-before-function-paren': 'error',
        'spaced-comment': 'error',
        'arrow-spacing': 'error',
        'key-spacing': [2, { 'beforeColon': false, 'afterColon': true }],
        'keyword-spacing': 'error',
        'semi': ['error', 'always'],
        'dot-location': ['error', 'property'],
        'dot-notation': 'error',
        'no-alert': 'off',
        'eqeqeq': ['error', 'always'],
        'no-floating-decimal': 'error',
        'no-global-assign': 'error',
        'no-multi-spaces': 'error',
        'no-useless-return': 'error',
        'no-undef-init': 'warn',
        'no-use-before-define': ['error', { 'functions': false }],
        'array-bracket-newline': ['error', 'consistent'],
        'brace-style': ['error', '1tbs'],
        'comma-dangle': ['error', 'always-multiline'],
        'comma-spacing': 'error',
        'comma-style': 'error',
        'eol-last': 'error',
        'func-call-spacing': 'error',
        'quotes': ['error', 'single', { 'allowTemplateLiterals': true }],
        'quote-props': ['error', 'as-needed'],
        'linebreak-style': 'warn',
        'lines-around-comment': 'warn',
        'max-depth': ['error', 3],
        'max-statements-per-line': 'error',
        'newline-per-chained-call': 'error',
        'no-lonely-if': 'error',
        'no-mixed-operators': 'warn',
        'no-multiple-empty-lines': ['error', { 'max': 1, 'maxEOF': 0, 'maxBOF': 0 }],
        'no-tabs': 'warn',
        'space-before-blocks': 'error',
        'space-infix-ops': 'error',
        'space-unary-ops': [2, {
            'words': true,
            'nonwords': true,
            'overrides': {
                '-': false,
                '++': false,
                '--': false,
            },
        }],
        'space-in-parens': 'error',
        'switch-colon-spacing': 'error',
        'arrow-body-style': 'error',
        'no-duplicate-imports': 'warn',
        'no-useless-computed-key': 'warn',
        'no-var': 'error',
        'arrow-parens': ['error', 'as-needed'],
        'curly': 'error',
        'object-curly-spacing': ['error', 'always'],
        'require-atomic-updates': 'off',
        'no-prototype-builtins': 'off',
        'object-shorthand': ['error', 'always'],
    },
};