sites/tasks/minify-images.js
'use strict';
var gulp = require('gulp');
var imageop = require('gulp-image-optimization');
gulp.task('minify-images', ['build-less'], function () {
var paths = (["gif","jpg","png"]).map(function(ext){
return "./build/apps/images/**/*." + ext;
});
return gulp.src(paths)
.pipe(imageop({
optimizationLevel: 5,
progressive: true,
interlaced: true
})).pipe(gulp.dest("./build/minified/images"));
});