Upgrade typescript package to v3.8.3 and fix "npm audit" (#126)

* upgrade typescript to v3.8.3

* fix lint errors, upgrade packages related to typescript

* fix npm audit

Author: davidfirst

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [unreleased]
 
+- upgrade typescript to 3.8.3
+
 ## [2.1.6-dev.1] - 2020-01-25
 
 - fix components dependencies detection to resolve from package.json if not exist on the fs