Refactor removed type definitions

[parkerault]

This commit: be2a01a5e79c637d29de261a679752b0a34b3bf3 removed the index.d.ts type definitions file from src. This also makes the js client options passed to the react component untyped, which makes it very difficult to work with in a typescript project. This seems like a pretty major oversight since the js client itself has extensive typescript definitions.