Show only files with .zip or .pdf extension WP MEDIA - Wordpress

custom.js

var image = wp.media({
    title: 'Import file',
    multiple: false, //if true, allow select multiple files
    library: {
      type: [ 'application/zip', 'application/pdf' ]
    }
}).open()
.on('select', function(e){
  //DO SOMETHING
});