gulp-smushit 
Gulp plugin to optimize PNG and JPG using reSmush.it. Made on top of smosh.
reSmush.it is a FREE alternative to Yahoo Smush.it (deprecated on March 2015). This tool provides a online way to optimize pictures size via a documented webservice.
Prefer Grunt? grunt-smushit
$ npm install --save-dev gulp-smushitvar gulp = require('gulp');
var smushit = require('gulp-smushit');
gulp.task('default', function () {
return gulp.src('src/**/*.{jpg,png}')
.pipe(smushit())
.pipe(gulp.dest('dist'));
});Type: boolean
Default: false
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MIT © Helder Santana