How to use draft-js-import-markdown with TypeScript?

I am using this `draft-js-import-markdown` and `draft-js-export-markdown` in a React TypeScript project, but I get the following error:
```
Cannot find module 'draft-js-import-markdown' or its corresponding type declarations.
```
There does not seem to be any typings package for this either.
How can we use these two packages with TS?