.eslintrc

{
  "env": {
    "node": true
  },
  "parserOptions": {
    "ecmaVersion": 8
  },
  "rules": {
    // Reference
    //  "off" or 0 - turn the rule off
    //  "warn" or 1 - turn the rule on as a warning (doesn’t affect exit code)
    //  "error" or 2 - turn the rule on as an error (exit code is 1 when triggered)

    "array-bracket-spacing": [1, "never"], // disallow spaces between array brackets and other tokens
    "block-scoped-var": 2, // treat var statements as if they were block scoped (off by default). 0: deep destructuring is not compatible https://github.com/eslint/eslint/issues/1863
    "brace-style": [2, "1tbs", { "allowSingleLine": true }], // enforces consistent brace style for blocks
    "camelcase": 2, // enforces camelcase style for property names
    "computed-property-spacing": [2, "never"], // disallows spaces inside computed property brackets
    "comma-spacing": [1, {"before": false, "after": true}], // enforce spacing before and after comma
    "comma-style": [1, "last"], // enforce one true comma style (off by default)
    "curly": 2, // enforces curly braces for code block statements, even if one line
    "consistent-this": [1, "me"], // enforces consistent naming when capturing the current execution context (off by default)
    "eol-last": 1, // enforce newline at the end of file, with no multiple empty lines
    "eqeqeq": [2, "smart"], // require the use of === and !==
    "max-depth": [1, 3], // disallow more than 3 nested code blocks
    "max-len": [1, 80], // enforces a maximum line length to increase code readability and maintainability
    "max-statements": [1, 15], // enforces a maximum number of statements allowed in function blocks
    "new-cap": 1, // requires constructor names to begin with a capital letter
    "no-extend-native": 2, // disallows directly modifying the prototype of built-in objects
    "no-mixed-spaces-and-tabs": 2, // disallows mixed spaces and tabs for indentation
    "no-trailing-spaces": 2, // disallows trailing whitespace (spaces, tabs, and other Unicode whitespace characters) at the end of lines
    "no-unused-vars": 1, // aimed at eliminating unused variables, functions, and parameters of functions
    "no-use-before-define": [2, "nofunc"], // error when it encounters a reference to an identifier that has not yet been declared
    "object-curly-spacing": [2, "never"], // enforce consistent spacing inside braces of object literals, destructuring assignments, and import/export specifiers
    "quotes": [2, "single", { "allowTemplateLiterals": true }], // enforces the consistent use of either backticks, double, or single quotes
    "quote-props": [1, "as-needed", {"keywords": true}], // require quotes around object literal property names (off by default)
    "semi-style": [2, "last"], //  reports line terminators around semicolons
    "keyword-spacing": [2, {"before": true, "after": true}], // enforces consistent spacing around keywords and keyword-like tokens
    "space-unary-ops": 2, // enforces consistency regarding the spaces after words unary operators and after/before nonwords unary operators
    "indent": ["error", 2], // enforces a consistent indentation style of 2 spaces
    "vars-on-top": 2, // requires to declare all vars on top of their containing scope (off by default)
    "no-else-return": 2 // disallow else after a return in an if (off by default)
  }
}