.eslintrc

{
  "plugins": [
    "react"
  ],
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true,
      "experimentalObjectRestSpread": true
    }
  },
  "env": {
    "es6":     true,
    "browser": true,
    "node":    true,
    "mocha":   true
  },   
  "extends": [
    "eslint:recommended", 
    "plugin:react/recommended"
  ],    
  "rules": {
    "strict": [ 2, "safe" ],
    "no-debugger": 2,
    "brace-style": [
      2,
      "1tbs",
      { "allowSingleLine": true }
    ],        
    "no-trailing-spaces": 2,
    "keyword-spacing": 2,
    "space-before-function-paren": [
      2,
      "never"
    ],
    "spaced-comment": [2, "always" ],
    "vars-on-top": 2,
    "no-undef": 2,
    "no-undefined": 2,
    "comma-dangle": [ 2, "never" ],
    "quotes": [ 2, "single" ],
    "semi": [ 2, "always" ],
    "guard-for-in": 2,
    "no-eval": 2,
    "no-with": 2,
    "valid-typeof": 2,
    "no-unused-vars": 2,
    "no-continue": 0,
    "no-console": 1,
    "no-extra-semi": 1,
    "no-unreachable": 1,
    "no-unused-expressions": 1,
    "max-len": [1, 200, 4],
    "react/prefer-es6-class": 1,
    "react/prop-types": 0,
    "default-case": 0,
    "use-default": 0
  }
}