old_contents: module.exports = function (grunt) {
  
  	grunt.initConfig({
  
  		pkg: grunt.file.readJSON('package.json'),
  
  		clean: {
  			build: {
  				src: "build"
  			}
  		},
  
  		copy: {
  			build: {
  				files: [
  					{
  						expand: true,
  						cwd: 'source/',
  						src: ['clever-style-switcher.js'],
  						dest: 'build/'
  					}
  				]
  			}
  		}
  	});
  
  	grunt.loadNpmTasks('grunt-contrib-clean');
  	grunt.loadNpmTasks('grunt-contrib-copy');
  
  	grunt.registerTask('build', ['clean', 'copy']);
  
  	grunt.registerTask('default', ['build']);
  };
new_contents: module.exports = function (grunt) {
  
  	grunt.initConfig({
  
  		pkg: grunt.file.readJSON('package.json'),
  
  		clean: {
  			build: {
  				src: "build"
  			}
  		},
  
  		copy: {
  			build: {
  				files: [
  					{
  						expand: true,
  						cwd: 'source/',
  						src: ['clever-style-switcher.js'],
  						dest: 'build/'
  					}
  				]
  			}
  		},
  
  		uglify: {
  			build: {
  				files: {
  					'build/css.min.js': ['source/clever-style-switcher.js']
  				}
  			}
  		}
  	});
  
  	grunt.loadNpmTasks('grunt-contrib-clean');
  	grunt.loadNpmTasks('grunt-contrib-copy');
  	grunt.loadNpmTasks('grunt-contrib-uglify');
  
  	grunt.registerTask('build', ['clean', 'copy']);
  
  	grunt.registerTask('default', ['build']);
  };
subject: Add an uglify task for Grunt.