Gulp-bro doesn't seem to work on stream, but on files?

[FlyveHest]

My scenario is the following.

I have a token, @@imports@@, in my JS source, and I am trying to generate a list of import statements based on js files in a folder.

Gulp pipeline, componentImportString is a variable containing the import statements.

  return gulp.src('src/js/index.js')
    .pipe(through.obj(function (chunk, enc, callback) {
      if (chunk.isBuffer()) {
        chunk.contents = Buffer.from(chunk.contents.toString(enc).replace('// @@IMPORTS@@', componentImportString), enc);

        this.push(chunk);
      }

      callback();
    }))
    .pipe(bro(browserifySettings))
    .pipe(rename('bundle.js'))
    .pipe(gulp.dest('dist/js'))

Note: I started with a simpler gulp-replace, but the results have been the same all the way through.

If I comment gulp-bro from my pipeline, I can see that the list of files are generated correctly, and transformed / replaced into the source as excpected.

But, when I run this with gulp-bro enabled, my transformation is completely ignored, it seems like gulp-bro work directly on files on disk, and not on the vinyl-stream in the pipeline.

Note 2: I have tried doing this transformation in browserify itself, but I am also running the esmify plugin, and it looks like browserify processes plugins before transformations, so thats not a solution either.