I'd strongly urge you to reconsider using TypeScript. At this point there isn't much difference between TypeScript and ES6 (besides the types) and types are a gigantic maintainability booster and significantly reduces bugs. The TypeScript language server also provides high quality autocomplete and jump-to-definition functionality in your editor of choice. It's very helpful to be able to enumerate through object methods and properties for 3rd party libraries as well as your own application code.