.eslintrc

{
   "parser": "babel-eslint",
   "parserOptions": {
        "ecmaVersion": 6, // es6
        "sourceType": "module", // use modules
        "ecmaFeatures": {
            "jsx": true, // react
            "experimentalObjectRestSpread": true // ...
        }
    },
    "plugins": [
        "react"
    ],
    // 0 - off, 1 - warning, 2 - error
    "rules": {
        // doc
        "valid-jsdoc": 1, // enforce valid JSDoc comments
        
        // syntax
        "indent": [2, 2], // enforce consistent indentation
        "no-mixed-spaces-and-tabs": 0,  // disallow mixed spaces and tabs for indentation
        "jsx-quotes": 2, // enforce the consistent use of either double or single quotes in JSX attributes
        "no-multiple-empty-lines": 2, // disallow multiple empty lines
        "no-confusing-arrow": 2, // disallow arrow functions where they could be confused with comparisons
        
        // code 
        "no-const-assign": 2, // disallow reassigning const variables 
        "no-dupe-class-members": 2, //  disallow duplicate class members
        "no-duplicate-imports": 2, // disallow duplicate module imports
        "no-unreachable": 2, // disallow unreachable code after return, throw, continue, and break statements
        "no-unused-vars": 1, // disallow unused variables
        "no-unneeded-ternary": 2, // disallow ternary operators when simpler alternatives exist
        "no-extra-bind": 2, // disallow unnecessary calls to .bind()
        "no-case-declarations": 2, // disallow lexical declarations in case clauses
        "no-fallthrough": 2, // disallow fallthrough of case statements
        "no-implicit-globals": 2, // disallow var and named function declarations in the global scope
        "no-invalid-this": 2, // disallow this keywords outside of classes or class-like objects
        "no-loop-func": 1, // disallow function declarations and expressions inside loop statements
        "no-new-wrappers": 2, // disallow new operators with the String, Number, and Boolean objects
        "no-param-reassign": 2, // disallow reassigning function parameters
        "no-redeclare": 2, // disallow var redeclaration
        "no-self-compare": 2, // disallow comparisons where both sides are exactly the same
        "no-self-assign": 2, // disallow assignments where both sides are exactly the same
        "no-magic-numbers": 1, // disallow magic numbers
        "no-unmodified-loop-condition": 2, // disallow unmodified loop conditions
        "no-unused-expressions": 2, // disallow unused expressions
        "no-sequences": 2, // disallow comma operators
        "no-throw-literal": 2, // disallow throwing literals as exceptions
        "no-shadow": 2, // disallow var declarations from shadowing variables in the outer scope
        "no-use-before-define": 1, // disallow the use of variables before they are defined
        "no-process-exit": 1, // disallow the use of process.exit()
        "no-this-before-super": 2, // disallow this/super before calling super() in constructors 
        "no-useless-constructor": 2, // disallow unnecessary constructors
        "radix": 2, // enforce the consistent use of the radix argument when using parseInt()
        "yoda": 2, // require or disallow “Yoda” conditions
        "prefer-template": 1, // require template literals instead of string concatenation
        "array-callback-return": 2, // enforce return statements in callbacks of array methods
        "curly": 2, // enforce consistent brace style for all control statements
        "consistent-return": 1, // require return statements to either always or never specify values
        "vars-on-top": 2 // require var declarations be placed at the top of their containing scope 
    }
    
}