.jshintrc

{
    // --------------------------------------------------------------------
    // JSHint Configuration, Strict Edition
    // --------------------------------------------------------------------

    "esversion": 9,
  
    // == Enforcing Options ===============================================
    //
    // These options tell JSHint to be more strict towards your code. Use
    // them if you want to allow only a safe subset of JavaScript, very
    // useful when your codebase is shared with a big number of developers
    // with different skill levels.
  
    "bitwise"       : true,     // Prohibit bitwise operators (&, |, ^, etc.).
    "curly"         : true,     // Require {} for every new block or scope.
    "eqeqeq"        : true,     // Require triple equals i.e. `===`.
    "forin"         : true,     // Require `for in` loops without `hasOwnPrototype`.
    "freeze"        : true,     // Prohibits overwriting prototypes of native objects such as Array, Date
    "immed"         : true,     // Require immediate invocations to be wrapped in parens e.g. `( function(){}() );`
    "latedef"       : true,     // Prohibit variable use before definition.
    "newcap"        : true,     // Require capitalization of all constructor functions e.g. `new F()`.
    "noarg"         : true,     // Prohibit use of `arguments.caller` and `arguments.callee`.
    "noempty"       : true,     // Prohibit use of empty blocks.
    "nonew"         : false,     // Prohibit use of constructors for side-effects.
    "plusplus"      : false,     // Prohibit use of `++` & `--`.
    "quotmark"      : false,     // Force consistency of quotemarks
    "undef"         : true,     // Require all non-global variables be declared before they are used.
    "strict"        : false,     // Require `use strict` pragma in every file.
    "trailing"      : true,     // Prohibit trailing whitespaces.
    "unused"        : true,     // Warn when you define and never use your variables
  
  
    // == Relaxing Options ================================================
    //
    // These options allow you to suppress certain types of warnings. Use
    // them only if you are absolutely positive that you know what you are
    // doing.
  
    "asi"           : false,    // Tolerate Automatic Semicolon Insertion (no semicolons).
    "boss"          : false,    // Tolerate assignments inside if, for & while. Usually conditions & loops are for comparison, not assignments.
    "debug"         : false,    // Allow debugger statements e.g. browser breakpoints.
    "eqnull"        : false,    // Tolerate use of `== null`.
    "esnext"        : false,    // Allow ES.next specific features such as `const` and `let`.
    "evil"          : false,    // Tolerate use of `eval`.
    "expr"          : false,    // Tolerate `ExpressionStatement` as Programs.
    "funcscope"     : false,    // Tolerate declarations of variables inside of control structures while accessing them later from the outside.
    "globalstrict"  : true,    // Allow global "use strict" (also enables 'strict').
    "iterator"      : false,    // Allow usage of __iterator__ property.
    "lastsemic"     : false,    // Tolerate missing semicolons when the it is omitted for the last statement in a one-line block.
    "laxbreak"      : false,    // Tolerate unsafe line breaks e.g. `return [\n] x` without semicolons.
    "laxcomma"      : false,    // Suppress warnings about comma-first coding style.
    "loopfunc"      : false,    // Allow functions to be defined within loops.
    "multistr"      : false,    // Tolerate multi-line strings.
    "proto"         : false,    // Tolerate __proto__ property. This property is deprecated.
    "scripturl"     : false,    // Tolerate script-targeted URLs.
    "smarttabs"     : false,    // Tolerate mixed tabs and spaces when the latter are used for alignment only.
    "shadow"        : false,    // Allows re-define variables later in code e.g. `var x=1; x=2;`.
    "sub"           : false,    // Tolerate all forms of subscript notation besides dot notation e.g. `dict['key']` instead of `dict.key`.
    "supernew"      : false,    // Tolerate `new function () { ... };` and `new Object;`.
    "validthis"     : false,    // Tolerate strict violations when the code is running in strict mode and you use this in a non-constructor function.
  
    // == Environments ====================================================
    //
    // These options pre-define global variables that are exposed by
    // popular JavaScript libraries and runtime environments—such as
    // browser or node.js.
  
    "browser"       : true,     // Standard browser globals e.g. `window`, `document`.
    "devel"         : true,    // Allow development statements e.g. `console.log();`.

    // == Undocumented Options ============================================
    //
    // While I've found these options in [example1][2] and [example2][3]
    // they are not described in the [JSHint Options documentation][4].
    //
    // [4]: http://www.jshint.com/options/
  
    "maxerr"        : 100,      // Maximum errors before stopping.
    "predef"        : [         // Extra globals.
      "require"
    ]
  }