.eslintrc.json

{
  "env": {
    "browser": true,                    // Allow to use browser defined variable (not console, alert etc.)
    "node": true,                       // Allow to use node defined variable (require, process etc.)
    "es6": true                         // Allow to use class semantics
  },
  "parserOptions": {
    "ecmaVersion": 6,                   // Allow to use class semantics
    "sourceType": "module"              // Allow to use import/export
  },
  "extends": "eslint:recommended",      // Implement recommended rules
  "rules": {
    "curly": ["error", "all"],          // Error for no curly brancket in loop or conditions
    "no-unused-vars":                   // Error for unused variables, not detect arguments
        ["error", {"args": "none"}],
    "no-undef": "error",                // Error for unused variable (that will become global variable)
    "new-cap": "error",                 // Error for lowercase first letter or constructor call as function
    "eqeqeq": ["error", "always"],      // Error for ==, != to compare
    "no-use-before-define":             // Error for using variable before definition
        ["error", {"functions":false, "classes":false}],
    "comma-dangle": ["error", "never"], // Error for trailing comma
    "block-scoped-var": "warn",         // Warn var declaration inside block scope
    "no-useless-escape": "off",         // Allow unnessesary escape charactors
    "no-extra-boolean-cast": "off",     // Allow to use boolean cast for boolean value
    "no-mixed-spaces-and-tabs": "off",  // Allow to use spaces and tabs for indent
    "dot-notation": "off"               // Allow object access via obj["name"]
  }
}