gulpfile.js

var gulp = require('gulp');
var webserver = require('gulp-webserver');

// concat-js definition ...

// uglify definition ...

gulp.task('watch', function() {
	gulp.watch(['./src/**/*'], ['uglify']);
});

gulp.task('webserver', function() {
	gulp.src('./')
	  .pipe(webserver({ port: 8000 }));
});

gulp.task('develop', ['uglify', 'watch', 'webserver']);