JS methods always return NativeJavaScriptObject instead of the declared dart type

[neterror]

When JS method returns an object, its type is NativeJavaScriptObject instead of the declared Dart type. For example in CircleMarker, the method getLatLng is declared as: external LatLng getLatLng();

var c = CircleMarker(); var pos = c.getLatLng(); // pos type is NativeJavaScriptObject instead of LatLng

getLatLng() is declared to return LatLng, but it returns NativeJavaScriptObject. This object fails the type checks if it is passed to function that expects LatLng.

var positions = []; positions.add(pos); // error! Type mismatch

[bkraszewski]

@neterror ran into a similar problem, have you solved it?

[neterror]

The solution was to declare the types of data, returned from javascript as dynamic, instead of specific dart type.