Missing files in Grundfile.js

[CodeCommerce]

I had a problem, when generating js / css via grunt

"Uncaught TypeError: Class extends value undefined is not a constructor or null" "class BaseComponent extends Config"

needed to add files to Grundfile.js into concat: ..

`concat: {
            js: {
                options: {
                    separator: ';\n',
                    sourcemap: false
                },
                files: {
                    '<%= project.out %><%= project.theme %>/src/js/scripts.min.js': [
                       .....
                        '<%= project.dev %>node_modules/bootstrap/js/dist/dom/manipulator.js',
                        '<%= project.dev %>node_modules/bootstrap/js/dist/util/index.js',
                        '<%= project.dev %>node_modules/bootstrap/js/dist/util/component-functions.js',
                        '<%= project.dev %>node_modules/bootstrap/js/dist/util/config.js',
                        '<%= project.dev %>node_modules/bootstrap/js/dist/base-component.js',
....
                    ],
                    '<%= project.out %><%= project.theme %>/src/js/scripts.jq.min.js': [
                    ........
                        '<%= project.dev %>node_modules/bootstrap/js/dist/dom/manipulator.js',
                        '<%= project.dev %>node_modules/bootstrap/js/dist/util/index.js',
                        '<%= project.dev %>node_modules/bootstrap/js/dist/util/component-functions.js',
                        '<%= project.dev %>node_modules/bootstrap/js/dist/util/config.js',
                        '<%= project.dev %>node_modules/bootstrap/js/dist/base-component.js',
.....
                    ],`

this solved my problem