Missing Typescript Definitions

Hey devs! Thank you so much for making this wonderful utility! So the original [node-bunyan](https://github.com/trentm/node-bunyan) has typescript definitions under [DefinitelyTyped](https://github.com/DefinitelyTyped/DefinitelyTyped) - for consistency (and ease of use for the friendly typescript developer) is there a chance that we could get some typescript definitions?