.eslintrc.js

module.exports = {
  env: {
    browser: true,
    node: true,
    jest: true
  },
  parserOptions: {
    ecmaVersion: 9,
    sourceType: 'module',
    allowImportExportEverywhere: true
  },
  extends: [
    'eslint:recommended'
  ],
  rules: {
    // Possible Errors
    'no-empty': ['error', {
      'allowEmptyCatch': true
    }],
    'no-use-before-define': ['error', {
      'functions': false
    }],
    // Stylistic Issues
    'indent': ['warn', 2, {
      'SwitchCase': 1,
      'ignoredNodes': ['TemplateLiteral']
    }],
    'quotes': ['warn', 'single', {
      'allowTemplateLiterals': true
    }],
    'no-multiple-empty-lines': ['warn', {
      'max': 1
    }],
    'space-infix-ops': ['warn', {
      'int32Hint': false
    }],
    'semi': ['warn', 'always'],
    'no-trailing-spaces': ['warn'],
    'comma-spacing': ['warn'],
    'comma-style': ['warn'],
    'operator-linebreak': ['warn', 'before'],
    'brace-style': ['warn'],
    'keyword-spacing': ['warn'],
    'object-curly-spacing': ['warn', 'always'],
    'space-before-blocks': ['warn', 'always'],
    'spaced-comment': ['warn', 'always'],
    'space-before-function-paren': ['warn', {
      'anonymous': 'always',
      'named': 'never',
      'asyncArrow': 'always'
    }],
    'padded-blocks': ['warn', 'never'],
    'comma-dangle': ['warn', 'never'],
    // Best Practices
    'curly': ['warn'],
    'eqeqeq': ['error', 'always', {
      'null': 'ignore'
    }],
    'no-multi-spaces': ['warn', {
      'ignoreEOLComments': true,
      'exceptions': {
        'Property': false
      }
    }],
    'no-extra-parens': ['warn', 'all']
  }
};