Gulp error while watching requires restart of play application

[svenwiegand]

When running the play application using run, gulp watch is called by sbt-play-gulp. If gulp causes an error e.g. due to a JavaScript syntax error, gulp watch is finished. In this scenario I need to stop the play application and rerun it, to make watching work again.

As it is common, that syntax errors in JavaScript appear I would prefer some kind of loop, so that gulp watch is started again after it terminated unexpectedly, as long as the play application is running.

[udalrich]

You can work around this with something like this:

browserify().transform('babelify', { ...}).
      bundle().
      on('error', function (err) {
          console.error('Error running browserify', err.message);
      }).
     pipe(fs.createWriteStream('dist.main.js'));

You will probably want to versions: on with on('error') for gulp watch and one without it for making the file that is actually distributed, as otherwise your build will succeed with an empty output file when you have an error.