Accept feature projection in GeoJSON constructor

externs/olx.js

@@ -1666,7 +1666,8 @@ olx.format.WriteOptions.prototype.decimals;
 
 /**
  * @typedef {{defaultDataProjection: ol.ProjectionLike,
- *     geometryName: (string|undefined)}}
+ *     geometryName: (string|undefined),
+ *     featureProjection: ol.ProjectionLike}}
  */
 olx.format.GeoJSONOptions;
 
@@ -1679,6 +1680,15 @@ olx.format.GeoJSONOptions;
 olx.format.GeoJSONOptions.prototype.defaultDataProjection;
 
 
+/**
+ * Projection for features read or written by the format.  Options passed to
+ * read or write methods will take precedence.
+ * @type {ol.ProjectionLike}
+ * @api stable
+ */
+olx.format.GeoJSONOptions.prototype.featureProjection;
+
+
 /**
  * Geometry name to use when creating features.
  * @type {string|undefined}