Automated image compression with Gulp and JavaScript

gulpfile.js

// ltd_auto_image
//    SCK 20160503 | Gulp script QA Product AND Static images (55k)
//    Notes: NODE 5.10.0 | GULP 3.9.x
//.   🌑🌒🌓🌔🌕🌖🌗🌘🌑

var del = require('del'),
vinylPaths = require('vinyl-paths'),
gulp = require("gulp"),
debug = require("gulp-debug"),
imagemin = require("gulp-imagemin"),
jpegtran = require("imagemin-jpegtran"),
optipng  = require("imagemin-optipng"),
pngquant = require("imagemin-pngquant");
//mozjpeg  = require("imagemin-mozjpeg"),

var ogConfig = require("./gconfig")();

process.setMaxListeners(20);

gulp.task("images_watch",   function() {
    return gulp.src( ogConfig.sImages_in )
    .pipe(imagemin({
            progressive: true,
            use: [pngquant(), jpegtran(), optipng()]
        })).pipe( debug() ).pipe(vinylPaths(del)).pipe(gulp.dest( ogConfig.sImages_compressed ));
        //  LOSSY
        //use: [pngquant(), mozjpeg({quality: oConfig.nJPGQuality}), optipng()]
});
gulp.task("images_watch_s",   function() {
    return gulp.src( ogConfig.sImages_in_s )
    .pipe(imagemin({
            progressive: true,
            use: [pngquant(), jpegtran(), optipng()]
        })).pipe( debug() ).pipe(vinylPaths(del)).pipe(gulp.dest( ogConfig.sImages_compressed_s ));
        //  LOSSY
        //use: [pngquant(), mozjpeg({quality: oConfig.nJPGQuality}), optipng()]
});

gulp.task("default", ["images_watch","images_watch_s"]);