keep unsued and dead_code in uglifyjs (otherwise results in errors when using dynamic webpack chunks with `import`)
keep unsued and dead_code in uglifyjs (otherwise results in errors when using dynamic webpack chunks with `import`)

piJoe/docker-gulp-tasks,ipunkt/docker-gulp-tasks,ipunkt/docker-gulp-tasks,ipunkt/docker-gulp-tasks,piJoe/docker-gulp-tasks,piJoe/docker-gulp-tasks