React telling me I am using minified in dev ...

So this is my task:

gulp.task('prod', function() {
  browserify({entries: [
    'resources/assets/js/app.js'
  ]})
  .transform("babelify")
  .transform(envify({
     NODE_ENV: 'production'
  }))
  .bundle()
  .pipe(source('all.js'))
  .pipe(buffer())
  .pipe(sourcemaps.init({loadMaps: true}))
  .pipe(uglify())
  .on('error', gutil.log)
  .pipe(gulp.dest('public/js/'));
});

yet the console still sais:

all.js:30 Waing: It looks like you're using a minified copy of the development build of React. When deploying React apps to production, make sure to use the production build which skips development waings and is faster. See [url here that stack doesn't like] for more details.

So I am confused. Whats the deal?