[Help Wanted] Rewrite to Strict TypeScript

[kyranet]

Describe the issue

Veza already supports TypeScript via its typings, but it's support for TS could be greatly improved by rewriting it to strict TypeScript. This might as well fix some hidden bugs.

[dshubhadeep]

@kyranet This seems interesting. I would like to work on this.

[dshubhadeep]

@kyranet How do you want me to proceed ?

[kyranet]

Naturally, forking the repository, rewriting it to TS, and PRing it back. Obviously notifying it here (so people can know you're working on it). In case of doubt, you can ask me anytime 👍

[dshubhadeep]

@kyranet Hey, I have submitted a pull request.
I have converted the js files, but there were some errors that I wasn't able to resolve, such as Object is possibly null and some type errors.
Let me know if there are any additional changes.

[kyranet]

Fixed in #15