Getting below when I am running the engine:
let results = await engine.run(facts);
_.each(results.events, event => {
triggeredevents.push(event.params.data);
})

error log:
(node:22949) Warning: a promise was created in a handler at path/node_modules/json-rules-engine/dist/engine.js:278:21 but was not returned from it, see http://goo.gl/rRqMUw

at Function.Promise.cast (path/node_modules/bluebird/js/release/promise.js:225:13)