feat: Convert event builder module to TS (#680)

* Convert event_builder

* Clean up

* WIP

* Convert event_helpers

* More cleanup

* Incorporate comments

* Upgrade event-processor to v0.8.2

* NIT

Author: yavorona

packages/optimizely-sdk/CHANGELOG.MD

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Bug fixes
+- Bumped `event-processor` packages to version `0.8.2`.
+
 ## [4.6.0] - May 27, 2021
 
 ### New Features

packages/optimizely-sdk/lib/core/event_builder/event_helpers.d.ts

@@ -17,7 +17,7 @@ import sinon from 'sinon';
 import { assert } from 'chai';
 
 import fns from '../../utils/fns';
-import projectConfig from '../project_config';
+import * as projectConfig from '../project_config';
 import { buildImpressionEvent, buildConversionEvent } from './event_helpers';
 
 describe('lib/event_builder/event_helpers', function() {