Gruntfile.js

module.exports = function(grunt) {
    grunt.initConfig({
        node: './node_modules',
        dest: './src/main/webapp/_res/node',
        destJs: '<%= dest %>/js',
        destCss: '<%= dest %>/css',
        clean: {
            build: {
                src: ['<%= dest %>']
            }
        },
        mkdir: {
            all: {
              options: {
                create: ['<%= destCss %>/jquery-ui/images', '<%= destJs %>/jquery-ui/widgets']
              },
            },
        },
        copy: {
            main: {
                files: [
                    {
                        expand: true,
                        flatten: true,
                        src: ['<%= node %>/bootstrap/dist/css/bootstrap*min*',
                              '<%= node %>/xterm/css/xterm.*'
                             ],
                        dest: '<%= destCss %>/',
                        filter: 'isFile'
                    },
                    {
                        expand: true,
                        flatten: true,
                        src: ['<%= node %>/jquery-ui/themes/base/*'],
                        dest: '<%= destCss %>/jquery-ui/',
                        filter: 'isFile'
                    },
                    {
                        expand: true,
                        flatten: true,
                        src: ['<%= node %>/jquery-ui/themes/base/images/*'],
                        dest: '<%= destCss %>/jquery-ui/images',
                        filter: 'isFile'
                    },
                    {
                        expand: true,
                        flatten: true,
                        src: ['<%= node %>/jquery/dist/jquery.min.*',
                              '<%= node %>/@popperjs/core/dist/umd/popper.min.js',
                              '<%= node %>/@popperjs/core/dist/umd/popper.min.js.map',
                              '<%= node %>/bootstrap/dist/js/bootstrap.min.*',
                              '<%= node %>/floatthead/dist/jquery.floatThead.min.*',
                              '<%= node %>/xterm/lib/xterm.*',
                              '<%= node %>/xterm-addon-fit/lib/xterm-addon-fit.*'
                              ],
                        dest: '<%= destJs %>/',
                        filter: 'isFile'
                    },
                    {
                        expand: true,
                        flatten: true,
                        src: ['<%= node %>/jquery-ui/ui/*.*'],
                        dest: '<%= destJs %>/jquery-ui/',
                        filter: 'isFile'
                    },
                    {
                        expand: true,
                        flatten: true,
                        src: ['<%= node %>/jquery-ui/ui/widgets/draggable.*',
                              '<%= node %>/jquery-ui/ui/widgets/droppable.*',
                              '<%= node %>/jquery-ui/ui/widgets/resizable.*',
                              '<%= node %>/jquery-ui/ui/widgets/selectable.*',
                              '<%= node %>/jquery-ui/ui/widgets/sortable.*',
                              '<%= node %>/jquery-ui/ui/widgets/mouse.*'
                             ],
                        dest: '<%= destJs %>/jquery-ui/widgets',
                        filter: 'isFile'
                    }
                ]
            }
        }
    });

    grunt.loadNpmTasks('grunt-contrib-clean');
    grunt.loadNpmTasks('grunt-mkdir');
    grunt.loadNpmTasks('grunt-contrib-copy');

    grunt.registerTask('default', ['clean','mkdir','copy']);
};