gulp-uglify: gulp-uglify generates source maps but mapping is incorrect

I have this task to generate bundled & minified JavaScript file:

    return gulp.src(paths)
        .pipe(paths.sortByFilename ? sorter(key) : gulpUtil.noop())
        .pipe(plumber(eh('Error compiling javascript (' + key + ')')))
        .pipe(sourcemaps.init())
        .pipe(gulpBabel())
        .pipe(gulpConcat(key + '.js'))
        .pipe(gulp.dest(cp.build(gomModule) + '/js'))
        .pipe(gulpNgAnnotate({add: true, single_quotes: true}))
        .pipe(gulpUglify())
        .pipe(gulpRename({ extname: '.min.js' }))
        .pipe(sourcemaps.write("."))
        .pipe(gulp.dest(cp.build(gomModule) + '/js'));

Looks ok: .min.js gets mangled etc and sourcemaps are generated. But unfortunatelly debugging is not possible. Mapping is incorrect - stepping through the code / locals is broken. gulp-uglify seems to be the culprit because if I remove it from the the task, mapping works (with ngAnnotations in place as well as with babel transformation). Any idea that’s going on? User versions are:

"gulp-sourcemaps": "^2.1.1",
"gulp-ng-annotate": "~2.0.0",
"gulp-babel": "^6.1.2",
"gulp-concat": "^2.6.0",
"gulp-uglify": "^2.0.0",
"gulp-rename": "~1.2.0"

About this issue

Original URL
State: open
Created 8 years ago
Comments: 16 (3 by maintainers)

Most upvoted comments

Ran into this with 3.0.0, I had to set compress: false in the options for source maps to still work.

Ventajou on Jan 3, 2018

I think I am still having this problem, but there seem to be a lot of people complaining about sourcemaps without any solutions. The problem I am having is that the sourcemaps are generated, but if I add a console.error on a certain line the line number in the browser console is wrong. Which results in being sent to the wrong line in the file. I also checked the file itself and that actually perfectly matches the development file, so not sure why browsers are mapped to the wrong line.

I am using gulp-uglify in combination with gulp-concat and disabling gulp-uglify does solve the problem, but ofcourse that is no solution. Besides both should support sourcemaps just fine according to the documentation. I already tried all other suggested sollutions in other issues and this issue and nothing seems to help. I tested in both Firefox and Chrome and both had the same issue.

Is there any update or solution for this?

bartlubbersen on Aug 20, 2019