Prevent JSHint warning that 'functionName is defined but never used'

问题

I have just started using JSHint (through the Sublime-Linter package for Sublime Text 2). I would like to suppress its warnings regarding functions that are used before they are defined, as I see no problem with using function definitions like this. For example, the following code generates warnings:

(function($){ 

    $(document).ready(function()
    {
      formValidationSetup();
      refreshErrorMessages();
    });

    function formValidationSetup()
    {

    }

    function refreshErrorMessages()
    {

    }

})(jQuery);

The warnings:

formValidationSetup is defined but never used

refreshErrorMessages is defined but never used

I've tried setting undef to false in the JSHint options, but I'm still getting these errors. Is there another option I should be setting? Form the JSLint docs for undef:

true if variables and functions need not be declared before used. This is not available in strict mode.

回答1:

To avoid the warning

defined but never used

in jslint in your javascript add comments like:

 /*exported formValidationSetup, refreshErrorMessages */

In jshint and jslint you can set the unused option to false:

 /*jshint unused:false*/

See Options

回答2:

I had this problem with should and expect in Chai tests. I ended up with this pattern:

'use strict';

var request = require('supertest');
var should = require('chai').should();  // jshint ignore:line
var expect = require('chai').expect;    // jshint ignore:line

process.env.NODE_ENV = 'test';
var appPromise = require('./index');

describe('GET /r_u_up', function() {

  it('respond with 204', function(done) {
    appPromise.then(function(app) {
      request(app)
      .get('/r_u_up')
      .expect(204, done);
    });
  });

});

回答3:

You can simply use

"unused": false,

in your .jshintrc

回答4:

A better way not touching the Gruntfile.js in a typical Yoeman setup is to edit the .jshintrc file (a hidden file in Unix system). And update the content as the following:

{
  "curly": true,
  "eqeqeq": true,
  "immed": true,
  "latedef": true,
  "newcap": true,
  "noarg": true,
  "sub": true,
  "undef": true,
  "unused": false, // the change is here
  "boss": true,
  "eqnull": true,
  "node": true
}

set the "unused" to false.