how to debug gulp-sourcemaps not doing anything?

Question

how to debug gulp-sourcemaps not doing anything?

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.

node.js
gulp
gulp-concat
gulp-sourcemaps
gulp-uglify

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)