how to debug gulp-sourcemaps not doing anything?

Question

I have a fairly standard use case for gulp-sourcemaps

https://github.com/floridoo/gulp-sourcemaps

  gulp.src( bundle.src)
           .pipe(sourcemaps.init())
           .pipe(concat(bundle.dst + '.' + opts.ext))
            .pipe(uglify())
            .pipe(sourcemaps.write())
            .pipe(gulp.dest('./public/built'));

This produces appropriately concatenated and uglyified files. However there are no source map additions to them. bundle.src is an array of file paths. Not sure how to debug this.

Answer 1

You should look into gulp-util. It may give you some insight into what is actually happening.

var gutil = require('gulp-util')
...
.pipe(sourcemaps.init().on('error', gutil.log))

Answer 2

I had to specify where to write, like so:

.pipe(sourcemaps.write('./').on('error', gutil.log))

This didn't work: (no .map files generated)

.pipe(sourcemaps.write().on('error', gutil.log)