Function getArea

getArea(feature): number
JMap.Geometry.getArea

Works for feature having geometry equals to Polygon or a MultiPolygon.

It returns the area in square meters.

Throw an error if the provided feature geometry is not a Polygon or a MultiPolygon.
Parameters
- feature: Feature<Geometry, GeoJsonProperties>
  The Polygon or MultiPolygon feature
Returns number
Example
```
const feature = ...
// The method will return the area in m2
JMap.Geometry.getArea(feature)
```