Gruntfile.js

module.exports = function(grunt) {
  grunt.loadNpmTasks('grunt-contrib-jshint');
  grunt.initConfig({
      jshint: {
          options: {
            onevar: true
          },
          files: [ 'wtf.js' ]
      }
  });
  grunt.registerTask('default', 'jshint');
};

output.txt

grunt-cli v0.1.4
Initializing
Command-line options: --verbose

Reading "Gruntfile.js" Gruntfile...OK

Registering Gruntfile tasks.

Registering "grunt-contrib-jshint" local Npm module tasks.
Reading /private/tmp/grunt-jshint-wtf/node_modules/grunt-contrib-jshint/package.json...OK
Parsing /private/tmp/grunt-jshint-wtf/node_modules/grunt-contrib-jshint/package.json...OK
Loading "jshint.js" tasks...OK
+ jshint
Initializing config...OK
Loading "Gruntfile.js" tasks...OK
+ default

No tasks specified, running default tasks.
Running tasks: default

Running "default" task

Running "jshint" task

Running "jshint:files" (jshint) task
Verifying property jshint.files exists in config...OK
JSHint options: onevar
JSHint globals: (none)
Reading wtf.js...OK
Linting wtf.js...OK
>> 1 file lint free.

Done, without errors.

package.json

{
    "name": "grunt-jshint-bugreport",
    "version": "0.0.0",
    "engines": {
        "node": "0.8.x"
    },
    "dependencies": {
        "grunt": "0.4.x",
        "grunt-cli": "0.1.x",
        "grunt-contrib-jshint": "0.1.x"
    }
}

wtf.js

var a = 1;
var b = 2;