Geojson (#9702)

* Added Error to support stack

* initial seneca.d.ts

* Changed type of Position to be compatible with other packages

such as turf

geojson/geojson-tests.ts

@@ -72,6 +72,11 @@ var point: GeoJSON.Point = {
 	coordinates: [100.0, 0.0]
 };
 
+
+// This type is commonly used in the turf package
+var pointCoordinates: number[] = point.coordinates
+
+
 var lineString: GeoJSON.LineString = {
 	type: "LineString",
 	coordinates: [ [100.0, 0.0], [101.0, 1.0] ]
@@ -126,4 +131,4 @@ var geometryCollection: GeoJSON.GeometryCollection = {
             coordinates: [ [101.0, 0.0], [102.0, 1.0] ]
         }
     ]
-}
+}

geojson/geojson.d.ts

@@ -18,10 +18,7 @@ declare namespace GeoJSON {
     /***
     * http://geojson.org/geojson-spec.html#positions
     */
-    export interface Position
-    {
-        [index: number]: number;
-    }
+    export type Position = number[]
 
     /***
     * http://geojson.org/geojson-spec.html#geometry-objects