gistfile1.txt

var changed = require('gulp-changed');
var gulp = require('gulp');
var imagemin = require('gulp-imagemin');
var cache = require('gulp-cache');

gulp.task('images', function () {
  var dest = './dist/images';

  return gulp.src('./src/images/**')
    .pipe(changed(dest)) // Ignore unchanged files
    // .pipe(cache(imagemin({
    //   progressive: true,
    //   interlaced: true
    // }))) // Optimize
    .pipe(gulp.dest(dest));
});