gruntfile.js

module.exports = function(grunt) {

  grunt.initConfig({

    pkg: grunt.file.readJSON('package.json'),       // Read in package variable from package.json

    filename: 'isNullOrEmpty.<%= pkg.version %>', // Construct a filename from package vars

    timestamp: new Date().toUTCString(),            // Get a timestamp for banner comments

    // Construct a banner containing package and build information
    banner: '/*! <%= filename %>.js | <%= pkg.url %> | <%= pkg.license %>\n' +
            '*   <%= pkg.author %> | <%= pkg.contact %>\n' +
            '*   Built on <%= timestamp %> */\n',

    s: 'src/',  // The source directory
    d: 'dist/', // The distributable directory, where built files will end up
    t: 'test/', // The test directory, for unit test files/specs

    /**
     * Concatenation setup. Concatenated files are built to the path defined by the d variable
     * Includes closure banner and footer. Keep these in if you want to wrap concatenated code in closures
     */
    concat: {
      options: {
        banner: '<%= banner %>' +
                '\n;(function() {\n\n"use strict";\n',
        footer: '\n})();\n'
      },
      dist: {
        src: ['<%=s%>**/*.js'], // Define specific files in dependency order if required 
        dest: '<%= d %><%= filename %>.js'
      }
    },

    /**
     * Uglification (minification) setup. Uglified files are built to the path defined by the d variable and get a .min suffix
     */
    uglify: {
      options: {
        banner: '<%= banner %>'
      },
      dist: {
        files: {
          '<%= d %><%= filename %>.min.js': ['<%= concat.dist.dest %>'] // Each concatenated file will get an uglified version
        }
      }
    },

    /**
     * Jasmine unit test setup. Includes Istanbul code coverage setup with Coveralls-friendly output
     */
    jasmine: {
      src: ['<%=s%>**/*.js'], // Define specific files in dependency order if required 
      options: {
        specs: '<%=t%>**/*.js',
        template: require('grunt-template-jasmine-istanbul'),
        templateOptions: {
          coverage: 'coverage/coverage.json',
          report: [
            { type: 'lcov', options: { dir: 'coverage' }},      // Create .lcov report, required by Coveralls
            { type: 'html', options: { dir: 'coverage/html' }}, // Create an html report, readable by humans
            { type: 'text-summary' }                            // Output results to console post-build
          ],
          thresholds: {
            // Test result thresholds all set to 0 to begin with. Commented values are suggestions
            lines: 0, // 75
            statements: 0, // 75
            branches: 0, // 75
            functions: 0 // 75
          }
        }
      }
    },

    /**
     * JSHint static analysis setup
     */
    jshint: {
      files: ['gruntfile.js', '<%=s%>**/*.js', '<%=t%>**/*.js'], // Analyse this file and all source and test files for errors
      options: {
        browser: true, // Assume general browser globals
        globals: {
          predef: []   // Any global variables go here, if required 
        }
      }
    },

    /**
     * Watch setup. The configured tasks will run when and of the files tested by JSHint are changed
     */
    watch: {
      files: ['<%= jshint.files %>'],
      tasks: ['jshint', 'jasmine']
    },

    /**
     * Coveralls setup. Tells Coveralls where to find code coverage information
     */
    coveralls: {
      options: {
        force: true
      },
      src: 'coverage/lcov.info'
    }

  });

  // Load tasks in this order
  grunt.loadNpmTasks('grunt-contrib-concat');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-contrib-jasmine');
  grunt.loadNpmTasks('grunt-contrib-jshint');
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-coveralls');

  // Register test and build tasks.These can be run from the command line with "grunt test" or "grunt build"
  // "grunt watch" should be run while developing to notify you when things go wrong
  grunt.registerTask('test', ['jshint', 'jasmine', 'coveralls']);
  grunt.registerTask('build', ['jshint', 'jasmine', 'concat', 'uglify']);

};