Gruntfile.js file for concatenation and watch tasks.

(Build)Gruntfile.js

module.exports = function(grunt) {
	// Project configuration.
	grunt.initConfig({
		pkg: grunt.file.readJSON('package.json'),
		concat: {
			options: {
				separator: "\n", //add a new line after each file
				banner: "", //added before everything
				footer: "" //added after everything
			},
			dist: {
				// the files to concatenate
				src: [
					//include libs
					'libs/somelib/somelib.js',
					'libs/otherlib/otherlib.js',

					//own classes and files
					'src/**/!(base).js',

					//the last script I need
					'src/base.js'
				],
				// the location of the resulting JS file
				dest: 'js/<%= pkg.name %>.js'
			}
		},
		watch: {
			scripts: {
				files: ['src/**/*.js'],
				tasks: ['dev-watch'],
				options: {
					interrupt: true
				}
			}
		},
		removelogging: {
			dist: {
				src: "js/<%= pkg.name %>.js",
				dest: "build/<%= pkg.name %>.js"
			}
		},
		uglify: {
			options: {
				banner: ""
			},
			build: {
				src: 'build/<%= pkg.name %>.js',
				dest: 'js/<%= pkg.name %>.min.js'
			}
		}
	});	

	//load the packages
	grunt.loadNpmTasks('grunt-contrib-concat');
	grunt.loadNpmTasks('grunt-contrib-watch');
	grunt.loadNpmTasks('grunt-remove-logging');
	grunt.loadNpmTasks('grunt-contrib-uglify');

	//register the task
	grunt.registerTask('dev-watch', ['concat:dist']);
	grunt.registerTask('build', ['concat', 'removelogging', 'uglify']);
};

(Watch)Gruntfile.js

module.exports = function(grunt) {
	// Project configuration.
	grunt.initConfig({
		pkg: grunt.file.readJSON('package.json'),
		concat: {
			options: {
				separator: "\n", //add a new line after each file
				banner: "", //added before everything
				footer: "" //added after everything
			},
			dist: {
				// the files to concatenate
				src: [
					//include libs
					'libs/somelib/somelib.js',
					'libs/otherlib/otherlib.js',

					//own classes and files
					'src/**/!(base).js',

					//the last script I need
					'src/base.js'
				],
				// the location of the resulting JS file
				dest: 'js/<%= pkg.name %>.js'
			}
		},
		watch: {
			scripts: {
				files: ['src/**/*.js'],
				tasks: ['dev-watch'],
				options: {
					interrupt: true
				}
			}
		}
	});	

	grunt.loadNpmTasks('grunt-contrib-concat');
	grunt.loadNpmTasks('grunt-contrib-watch');

	//register the task
	grunt.registerTask('dev-watch', ['concat:dist']);
};