قطعه کد مربوطه:

const dir = {
    src         : '_src/',
    build       : '_build/'
  },
gulp = require('gulp'),
changed = require('gulp-changed'),
imgmin = require('gulp-imagemin');

gulp.task('imagemin', function(){
  gulp.src(dir.src + 'images/*.+(png|jpg|gif)')
  .pipe(changed(dir.build + 'images/'))
  .pipe(imgmin())
  .pipe(gulp.dest(dir.build + 'images/'))
});

دستورات اجرا شده و ارور مربوطه در اجرای gulp imgmin:

C:\Users\Sajjad>cd C:\Users\Sajjad\Desktop\project_gulp

C:\Users\Sajjad\Desktop\project_gulp>npm install --save-dev gulp-imagemin
npm WARN rollback Rolling back tar-pack@۳.۴.۰ failed (this is probably harmless): EPERM: operation not permitted, lstat 'C:\Users\Sajjad\Desktop\project_gulp\node_modules\fsevents\node_modules'
npm WARN saveError ENOENT: no such file or directory, open 'C:\Users\Sajjad\Desktop\project_gulp\package.json'
npm WARN enoent ENOENT: no such file or directory, open 'C:\Users\Sajjad\Desktop\project_gulp\package.json'
npm WARN project_gulp No description
npm WARN project_gulp No repository field.
npm WARN project_gulp No README data
npm WARN project_gulp No license field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@۱.۱.۳ (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@۱.۱.۳: wanted {"os":"darwin","arch":"any"} (current: {"os":"win۳۲","arch":"x۶۴"})

+ gulp-imagemin@۴.۱.۰
updated ۱ package in ۱۵.۹۱۸s

C:\Users\Sajjad\Desktop\project_gulp>gulp imagemin
[۱۶:۰۳:۲۴] Using gulpfile ~\Desktop\project_gulp\gulpfile.js
[۱۶:۰۳:۲۴] Starting 'imagemin'...
[۱۶:۰۳:۲۴] Finished 'imagemin' after ۱۲ ms

events.js:۱۳۷
      throw er; // Unhandled 'error' event
      ^
Error: The system cannot find the path specified.

    at notFoundError (C:\Users\Sajjad\Desktop\project_gulp\node_modules\cross-spawn\lib\enoent.js:۱۱:۱۱)
    at verifyENOENT (C:\Users\Sajjad\Desktop\project_gulp\node_modules\cross-spawn\lib\enoent.js:۴۶:۱۶)
    at ChildProcess.cp.emit (C:\Users\Sajjad\Desktop\project_gulp\node_modules\cross-spawn\lib\enoent.js:۳۳:۱۹)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:۲۰۹:۱۲)

C:\Users\Sajjad\Desktop\project_gulp>