问当幼虫环境处于生产状态时，吞噬缩小资产

EN

var gulp = require('gulp');
var concat = require('gulp-concat');
var minifyCSS = require('gulp-minify-css');
var autoprefixer = require('gulp-autoprefixer');

// css minification task
gulp.task('css', function(){
    gulp.src('app/assets/css/**/*.css')
        .pipe(minifyCSS())
        .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
        .pipe(concat('style.min.css'))
        .pipe(gulp.dest('public/assets/css'))
});