Gruntfile to concat & uglify

Gruntfile.js

'use strict';

module.exports = function(grunt) {

  // Project configuration.
  grunt.initConfig({

    concat: {
      dist: {
        src: ['main.js', 'ctrl1.js'], //source files goes here
        dest: 'build/lib.js'          //concatenated file goes here
      }
    },
    
    uglify: {
      options: {
        compress: {
          dead_code: true
        },
        wrap: true,
        sourceMap: true
      },
      dist: {
        src: '<%= concat.dist.dest %>',
        dest: 'build/lib.min.js',
      }
    }

  });


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

  grunt.registerTask('build', ['concat', 'uglify']);
};