Cool. So we are all done with our workflow automation.

We now have a gulp file , that

• Responsifies and minifies images
• cleans,autoprefixes,concatenates and minifies Css
• Concatenates and minifies JS
• Watches for changes to assets be it HTML | CSS | JS and triggers associated tasks
• Creates a build directory , and stores all processed deployment ready code inside it. And all that , in the background, while you just develop your app.

First argument to imagemin constructor is plugin array. By default, following plugins are used: [imagemin.gifsicle(), imagemin.jpegtran(), imagemin.optipng(), imagemin.svgo()]

Second argument are options. In the above example following options are used:

{
  progressive: true,
  interlaced: true,
  svgoPlugins: [{removeUnknownsAndDefaults: false}, {cleanupIDs: false}]
}

Those are completely optional.