async function enrichEventProperties(ctx) {
  let event = ctx.event;
  console.log(event.type);   // Always 'page'
  await enrichProperties(event);
  ctx.event = event;
  return ctx;
}

const eventEnrichmentPlugin = {
  name: 'Event Enrichment Plugin',
  version: '0.0.1',
  isLoaded: () => true,
  load: () => Promise.resolve(),
  type: 'enrichment',
  page: enrichEventProperties,
  track: enrichEventProperties,
};

global.analytics.ready(function () {
  global.analytics.register(eventEnrichmentPlugin);
});