Example gulpfile.js to get it going with LESS and AngularJS

gulpfile.js

var gulp = require('gulp');
var plugins = require('gulp-load-plugins')();
var rimraf = require('rimraf');

var paths = {
  less: ['./less/*.less'],
  js: ['./js/app/*.js', './js/app/**/*.js'],
  jsView: ['./js/app/views/*.html'],
  dist: {
    css: './public/css/',
    js: './public/js/',
    jsView: './public/views',
  },
  vendor: {
    css: ['./vendor/twitter/bootstrap/dist/css/bootstrap.min.css'],
    js: ['./js/vendor/*.js']
  },
  test: ['./js/tests/**.js']
};



/**
 * removes css- and js-dist folder.
 */
gulp.task('clean', function() {
  rimraf.sync(paths.dist.css);
    rimraf.sync(paths.dist.js);
})

/**
 * compiles less files into css.
 */
gulp.task('less', function() {
  gulp.src(paths.less)
    .pipe(plugins.concat('layout.css'))
    .pipe(plugins.less())
    .pipe(plugins.minifyCss())
    .pipe(gulp.dest(paths.dist.css));
});

gulp.task('js', function() {
  gulp.src(paths.js)
    .pipe(plugins.concat('app.js'))
    .pipe(plugins.uglify({mangle: false}))
    .pipe(gulp.dest(paths.dist.js));
});

gulp.task('js-view', function() {
  gulp.src(paths.jsView)
    .pipe(gulp.dest(paths.dist.jsView));
});

gulp.task('watch', function() {
  gulp.watch(paths.less, ['less', 'dist']);
  console.log('watching directory:' + paths.less.join(', '));
  
  gulp.watch(paths.js, ['js', 'dist']);
  console.log('watching directory:' + paths.js.join(', '));

  gulp.watch(paths.jsView, ['js-view', 'dist']);
  console.log('watching directory:' + paths.jsView.join(', '));
});

/**
 * copies vendor specific files to the public folder.
 */
gulp.task('vendor', function() {
  gulp.src(paths.vendor.css)
    .pipe(plugins.concat('vendor.css'))
    .pipe(plugins.minifyCss())
    .pipe(gulp.dest(paths.dist.css));

  gulp.src(paths.vendor.js)
    .pipe(plugins.concat('vendor.js'))
    .pipe(plugins.uglify({mangle: false}))
    .pipe(gulp.dest(paths.dist.js));
});

/**
 * tests the testing directory with jasmine.
 */
gulp.task('test', function() {
  gulp.src(paths.test)
    .pipe(plugins.jasmine());
});

/**
 * optimizes the output in terms of minification and concatenation.
 */
gulp.task('dist', function() {
  // add some optimizations (?)
});



gulp.task('build', ['clean', 'vendor', 'less', 'js', 'js-view', 'dist']);

gulp.task('default', ['build']);