dest.on is not a function at DestroyableTransform.Readable.pipe
var path = require('path')
var gulp = require('gulp')
var imagemin = require('imagemin')
var merge2 = require('merge-stream');
var merge = require('merge2');
var gm = require('gulp-gm');
var spritesmith = require('gulp.spritesmith');
var spritesmash = require('gulp-spritesmash');
var pngquant = require('imagemin-pngquant');
var rename = require("gulp-rename");
var source = "./testorig/"
var dest = "./test/"
gulp.task('sprites', function () {
var files = gulp.src(source+'/*.png')
// Short version:
var spriteData = files
.pipe(spritesmith({
imgName: 'sprite.png',
cssName: 'sprite.css'
}));
var buffer = require('vinyl-buffer');
var imgStream = spriteData.img
.pipe(buffer())
.pipe(imagemin({
progressive: true,
interlaced: true,
optimizationLevel: 7,
svgoPlugins: [{
removeViewBox: false
}, {
removeUselessStrokeAndFill: false
}],
plugins: [
pngquant({
quality: [70,90],
speed: 1
})
]
}))
.pipe(gulp.dest(dest));
});