The documentation comes from the Markdown files in the source code, so is always up-to-date but available only in English. Enjoy!
npm install --save @types/geojson
This package contains type definitions for GeoJSON Format Specification Revision (http://geojson.org/).
Files were exported from https://www.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/geojson
These definitions were written by Jacob Bruun https://github.com/cobster/.