JSLint is suddenly reporting Use the function form of use strict

Question

I include the statement    use strict     at the beginning of most of my Javascript files   JSLint has never before warned about this  But now it is  saying      Use the function form of  use strict     Does anyone know what the  function form  would be

User · Answer

I started creating a Node js browserify application following the Cross Platform JavaScript blog post  And I ran into this issue  because my brand new Gruntfile didn t pass jshint  Luckily I found an answer in the Leanpub book on Grunt   If we try it now  we will scan our Gruntfile    and get some errors    grunt jshint  Running  quot jshint all quot   jshint  task Linting Gruntfile js   ERROR  L1 C1  W097  Use the function form of  quot use strict quot    use strict   Linting Gruntfile js   ERROR  L3 C1  W117   module  is not defined  module exports   function  grunt     Warning  Task  quot jshint all quot  failed  Use --force to continue   Both errors are because the Gruntfile is a Node program  and by default JSHint does not recognise or allow the use of module and the string version of use strict  We can set a JSHint rule that will accept our Node programs  Let   s edit our jshint task configuration and add an options key  jshint      options        node  true          Adding node  true to the jshint options  to put jshint into  quot Node mode quot   removed both errors for me

User · Answer

If you re writing modules for NodeJS  they are already encapsulated  Tell JSLint that you ve got node by including at the top of your file     jslint node  true

User · Answer

process on  warning   function e         use strict       console warn e stack       process on  uncaughtException   function e         use strict       console warn e stack         add this lines to at the starting point of your file

User · Answer

This is how simple it is  If you want to be strict with all your code  add  use strict   at the start of your JavaScript   But if you only want to be  strict with some of your code  use the function form  Anyhow  I would recomend you to use it at the beginning of your JavaScript because this will help you be a better coder

User · Answer

I d suggest to use jshint instead   It allows to suppress this warning via   jshint globalstrict  true     If you are writing a library  I would only suggest using global strict if your code is encapsulated into modules as is the case with nodejs   Otherwise you d force everyone who is using your library into strict mode

User · Answer

There s nothing innately wrong with the string form    Rather than avoid the  global  strict form for worry of concatenating non-strict javascript  it s probably better to just fix the damn non-strict javascript to be strict

User · Answer

I think everyone missed the  suddenly  part of this question   Most likely  your  jshintrc has a syntax error  so it s not including the  browser  line   Run it through a json validator to see where the error is

User · Answer

Add a file  jslintrc  or  jshintrc in the case of jshint  at the root of your project with the following content          node   true

User · Answer

Include  use strict   as the first statement in a wrapping function  so it only affects that function   This prevents problems when concatenating scripts that aren t strict   See Douglas Crockford s latest blog post Strict Mode Is Coming To Town   Example from that post    function          use strict         this function is strict            function            but this function is sloppy            Update  In case you don t want to wrap in immediate function  e g  it is a node module   then you can disable the warning   For JSLint  per Zhami      jslint node  true      For JSHint     jshint strict false      or  per Laith Shadeed      jshint -W097      To disable any arbitrary warning from JSHint  check the map in JSHint source code  details in docs    Update 2  JSHint supports node boolean option  See  jshintrc at github      jshint node  true

[javascript] JSLint is suddenly reporting: Use the function form of "use strict"

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