.eslintrc.js

module.exports = {
  env: {
    browser: true,
    commonjs: true,
    es6: true,
    jasmine: true,
    jest: true,
    mocha: true,
    node: true,
  },
  extends: 'eslint:recommended',
  parser: 'babel-eslint',
  parserOptions: {
    sourceType: 'module',
  },
  rules: {
    'arrow-parens': [
      'error',
      'always',
    ],
    'arrow-spacing': 'error',
    'block-scoped-var': 'error',
    'block-spacing': [
      'error',
      'always',
    ],
    'brace-style': [
      'error',
      '1tbs',
    ],
    'comma-dangle': [
      'error',
      'always-multiline',
    ],
    'comma-spacing': 'error',
    'comma-style': [
      'error',
      'last',
    ],
    'computed-property-spacing': [
      'error',
      'never',
    ],
    curly: 'error',
    'dot-notation': 'error',
    'eol-last': 'error',
    'func-call-spacing': [
      'error',
      'never',
    ],
    'implicit-arrow-linebreak': [
      'error',
      'beside',
    ],
    indent: [
      'error',
      2,
      {
        ArrayExpression: 'first',
        CallExpression: {
          arguments: 'first',
        },
        FunctionDeclaration: {
          parameters: 'first',
        },
        FunctionExpression: {
          parameters: 'first',
        },
        ObjectExpression: 'first',
        SwitchCase: 1,
      },
    ],
    'key-spacing': [
      'error',
      {
        afterColon: true,
        beforeColon: false,
        mode: 'strict',
      },
    ],
    'keyword-spacing': [
      'error',
      {
        after: true,
        before: true,
      },
    ],
    'linebreak-style': [
      'error',
      'unix',
    ],
    'lines-between-class-members': [
      'error',
      'always',
    ],
    'max-len': [
      'error',
      100,
    ],
    'multiline-ternary': [
      'error',
      'always-multiline',
    ],
    'no-console': 0,
    'no-duplicate-imports': 'error',
    'no-eval': 'error',
    'no-floating-decimal': 'error',
    'no-implicit-globals': 'error',
    'no-implied-eval': 'error',
    'no-lonely-if': 'error',
    'no-multi-spaces': [
      'error',
      {
        ignoreEOLComments: true,
      },
    ],
    'no-multiple-empty-lines': 'error',
    'no-prototype-builtins': 'off',
    'no-return-assign': 'error',
    'no-script-url': 'error',
    'no-self-compare': 'error',
    'no-sequences': 'error',
    'no-shadow-restricted-names': 'error',
    'no-tabs': 'error',
    'no-trailing-spaces': 'error',
    'no-undefined': 'error',
    'no-unmodified-loop-condition': 'error',
    'no-unused-vars': [
      'error',
      {
        argsIgnorePattern: '^_',
        varsIgnorePattern: '^_',
      },
    ],
    'no-useless-computed-key': 'error',
    'no-useless-concat': 'error',
    'no-useless-constructor': 'error',
    'no-useless-return': 'error',
    'no-var': 'error',
    'no-void': 'error',
    'no-whitespace-before-property': 'error',
    'object-curly-newline': [
      'error',
      {
        consistent: true,
      },
    ],
    'object-curly-spacing': [
      'error',
      'never',
    ],
    'object-property-newline': [
      'error',
      {
        allowMultiplePropertiesPerLine: true,
      },
    ],
    'operator-linebreak': [
      'error',
      'after',
    ],
    'padded-blocks': [
      'error',
      {
        blocks: 'never',
      },
    ],
    'prefer-const': 'error',
    'prefer-template': 'error',
    'quote-props': [
      'error',
      'as-needed',
    ],
    quotes: [
      'error',
      'single',
      {
        allowTemplateLiterals: true,
      },
    ],
    semi: [
      'error',
      'always',
    ],
    'semi-spacing': [
      'error',
      {
        after: true,
        before: false,
      },
    ],
    'semi-style': [
      'error',
      'last',
    ],
    'space-before-blocks': [
      'error',
      'always',
    ],
    'space-before-function-paren': [
      'error',
      {
        anonymous: 'never',
        asyncArrow: 'always',
        named: 'never',
      },
    ],
    'space-in-parens': [
      'error',
      'never',
    ],
    'space-infix-ops': 'error',
    'space-unary-ops': [
      'error',
      {
        nonwords: false,
        words: true,
      },
    ],
    'spaced-comment': [
      'error',
      'always',
      {
        block: {
          balanced: true,
          exceptions: [
            '*',
          ],
        },
      },
    ],
    'switch-colon-spacing': [
      'error',
      {
        after: true,
        before: false,
      },
    ],
    'template-curly-spacing': [
      'error',
      'never',
    ],
    yoda: 'error',
  },
};