aodb/build/gulp/compile-less.js

var gulp = require('gulp'),
    less = require('gulp-less'),
    config = require('../gulp.config')(),
    concat = require('gulp-concat'),
    sourcemaps = require('gulp-sourcemaps'),
    postcss = require('gulp-postcss'),
    minifyCSS = require('gulp-minify-css');
autoprefixer = require('autoprefixer');

module.exports = gulp.task('compile-less', function () {
    var ret;
    if (environment === 'development') {
        ret = gulp.src(config.allLess)
                    .pipe(less())
                    .pipe(concat('chroma.compiled.css'))
                    .pipe(postcss([autoprefixer({ browsers: ['last 2 versions'] })]))
                    .pipe(gulp.dest('./www/css/'));
    } else {
        ret = gulp.src(config.allLess)
                    .pipe(less())
                    .pipe(minifyCSS())
                    .pipe(concat('chroma.compiled.css'))
                    .pipe(gulp.dest('./www/css/'));
    }

    return ret;
});