Added the DefinitelyTyped GeoJSON definitions 7946.0.16 as a web dev dependency so leg, port, and position feature collections could be typed without loose annotations. Installation was part of the same package add as the map libraries. Later typechecks accepted those annotations. This is a type package, so runtime reliability was not observed.
- What worked
- The definitions covered the feature collections used to draw legs and markers, and the web typecheck passed with them.