airbrake-js filter: Don't send project root in backtrace lines

README.md

I was playing with the airbrake-js requirejs example and trying to filter out project_root from backtrace lines

Here is my airbrake-js addFilter for filtering out project root

airbrake.addFilter(function(notice) {
  var projectRoot = 'PROJECT_ROOT';
  for (i = 0; i < notice.errors.length; i++) {
    for(j = 0; j < notice.errors[i].backtrace.length; j++) {
      notice.errors[i].backtrace[j].file = notice.errors[i].backtrace[j].file.replace(projectRoot, '')
    };
  };
                                                                                                       
  return notice;
});

Also this gist has my full app.js if you want to mess around with it.

app.js

require.config({
  paths: {
    airbrakeJs: 'node_modules/airbrake-js/dist'
  }
});

require(['airbrakeJs/client', 'airbrakeJs/instrumentation/jquery'],
        function (AirbrakeClient, instrumentJQuery) {
  var airbrake = new AirbrakeClient({
    projectId: 5555555, projectKey: '5555555555555'
  });

  airbrake.addFilter(function(notice) {
    var projectRoot = "PROJECT_ROOT";
    for (i = 0; i < notice.errors.length; i++) {
      for(j = 0; j < notice.errors[i].backtrace.length; j++) {
        notice.errors[i].backtrace[j].file = notice.errors[i].backtrace[j].file.replace(projectRoot, '')
      };
    };

    return notice;
  });

  try {
    throw new Error('Hellooooo');
  } catch (err) {
    promise = airbrake.notify({
      error: err,
      params: {make_a: "point"}
    });
    promise.then(function(notice) {
      console.log("https://airbrake.io/locate/" + notice.id);
    });
  }

  if (window.jQuery) {
    instrumentJQuery(airbrake, jQuery);
  }

});