Hi! First and foremost, thank you for this great package!
It helped me a lot in one of my project and is working like a charm.

I've integrated the tool in a Typescript project and had to augment the package with some types in order to be able to use it.
I know that there are plans to completely migrate the module to Typescript #15, but I though that maybe I could share my work with the community in the meantime.

For this reason I just created a PR DefinitelyTyped/DefinitelyTyped#59366 that adds type definitions to ethereum-block-by-date.

Anyone is welcomed to review the PR in order to speed up its integration!
Also, please let me know if you would like to be added as an owner of @types/ethereum-block-by-date as it would make future changes easier. @monosux I'm pinging you here as you may be interested in this.

Thanks!