Gulp not creating js sourcemaps file - gulp

Question

for some reason gulp not creating source maps file for concated and uglified js.
I tried different options and setups but with no luck.
I was working at one moment but than it stop working. Not sure why.
Here is the gulp task:
'use strict';
var gulp = require('gulp'),
sass = require('gulp-sass'),
autoprefixer = require('gulp-autoprefixer'),
sourcemaps = require('gulp-sourcemaps'),
clean = require('gulp-clean'),
cssmin = require('gulp-cssmin'),
rename = require('gulp-rename'),
runSequence = require('run-sequence'),
concat = require('gulp-concat'),
uglify = require('gulp-uglifyjs');
// Configure sass
gulp.task('sass', () => {
return gulp.src('sass/**/*.scss')
.pipe(sourcemaps.init())
.pipe(sass({
outputStyle: 'expanded'
}).on('error', sass.logError))
.pipe(sourcemaps.write('sourceMap'))
.pipe(gulp.dest('web/css'))
});
// Configure autoprefixer
gulp.task('autoprefixer', () => {
gulp.src(['web/css/**/*.css'])
.pipe(autoprefixer({
browsers: ['last 2 versions'],
cascade: false
}))
.pipe(gulp.dest('web/css/'))
});
// Configure clean task
gulp.task('clean:css', () => {
gulp.src('web/css/*.css')
.pipe(clean())
});
// Configure css min
var cssMinifyLocation = ['web/css/*.css', '!web/css/*.min.css'];
gulp.task('css:min', () => {
return gulp.src(cssMinifyLocation)
.pipe(autoprefixer())
.pipe(cssmin())
.pipe(rename(
{suffix: '.min'}
))
.pipe(gulp.dest('web/css'))
});
// Configure jsconcat and jsmin
gulp.task('compilejs', function()
{
gulp.src(
[
'web/js/twigjs/**/*.js'
])
.pipe(sourcemaps.init())
.pipe(concat('scripts.js'))
.pipe(uglify())
.pipe(rename({
suffix: '.min'
}))
.pipe(sourcemaps.write('.'))
.pipe(gulp.dest('web/js'));
});
// Configure watch
gulp.task('watch', () => {
gulp.watch('sass/**/*.scss', () => { runSequence('clean:css', 'sass',
'autoprefixer', ['css:min']) });
gulp.watch('web/js/twigjs/**/*.js', () => {runSequence('compilejs')});
});
// Run build task
gulp.task('build', (callback) => {
runSequence('clean:css', 'sass', 'autoprefixer',
['css:min'], callback);
});
Please advise, and provide feedback.
Or if you have suggestion what to do in some different way.

Answer 1

Try this code:
gulp.task('compilejs', function()
{
gulp.src(
[
'web/js/twigjs/**/*.js'
])
.pipe(sourcemaps.init())
.pipe(concat('scripts.js'))
.pipe(uglify())
.pipe(rename({
suffix: '.min'
}))
.pipe(sourcemaps.write('.'))
.pipe(gulp.dest('web/js'));
});