Rollup sourcemaps issues

[andreymatin]

Maybe need to use gulp-sourcemaps with merge-sourcemaps because of conflicts with concatenation functionality
or need to test https://www.npmjs.com/package/rollup-plugin-concat

npm install merge-sourcemaps --save-dev
npm install gulp-sourcemaps --save-dev

npm install rollup-plugin-concat --save-dev

const jsConcatVendorLibs = () =>
  src([
...
  ], { allowEmpty: true })
    .pipe(plumber({ errorHandler }))
    .pipe(sourcemaps.init())
    .pipe(concat('app.js'))
    .pipe(sourcemaps.write('.'))
    .pipe(dest('./dist/javascript/'))
    .pipe(connect.reload());