Rename and resize retina images with ImageMagick and gulp

gulpfile.js

// Note: install GraphicsMagick or ImageMagick before use!
// This config rename and resize retina (*@2x.png) images
var gulp = require('gulp');
var imageResize = require('gulp-image-resize');
var rename = require('gulp-rename');

var path = {
    sprite: 'sprite/*@2x.png'
};

gulp.task('resize', function () {
  gulp.src(path.sprite)
    // remove @2x postfix
    .pipe(rename(function (path) {
        path.basename = path.basename.slice(0, -3);
    }))
    // resize image
    .pipe(imageResize({
        imageMagick: true,
        width : '50%',
        filter: 'Catrom'
    }))
    // place files in same folder
    .pipe(gulp.dest(
        function(file) {
            return file.base;
        }
    ));
});

gulp.task('default', ['resize'], function () {
});