Unglify does not optimize, but increases the size by 2 times.. WTF?

Question

JavaScript

Why does Unglify not optimize but increase the size by 2 times..?
here are 2 tasks. normal version without compression, but minified with uglify plugin.

//js
gulp.task('js', function() {
    gulp.src('js/*.js')
    .pipe(sourcemaps.init())
    .pipe(concat('script.js'))
    .pipe(sourcemaps.write())
    .pipe(gulp.dest('../js'))
});

//js.min
gulp.task('jsMin', function() {
    gulp.src('js/*.js')
    .pipe(sourcemaps.init())
    .pipe(concat('script.min.js'))
    .pipe(uglify())
    .pipe(sourcemaps.write())
    .pipe(gulp.dest('../js'))
});

and that's what happened.

and if I put .pipe(uglify()) first in the task, then the size changes a little, but anyway, the minified version weighs more ... Tell me

how or what to correctly press JS, it somehow turns out strange :))

Answer 1

.pipe(sourcemaps.write())

here is the answer to your question. Your sourcemap is written directly to the resulting file. Keep her close and you'll be fine.

Answer 2

It confuses me that you are running the already optimized version of jQuery and possibly other libraries with the optimizer. Try it on your original files only