doc: Strong-Mode support

.analysis_options

@@ -0,0 +1,16 @@
+# ------------------------------------------------------------------------------
+# Config for Analyzer
+#   More: https://pub.dartlang.org/packages/analyzer
+#
+# Analyzer options:
+#   https://www.dartlang.org/guides/language/analysis-options
+#
+
+analyzer:
+  strong-mode: true
+
+  # Exclude wegen https://github.com/dart-lang/sdk/issues/26420
+  # und https://github.com/dart-lang/test/issues/436
+
+  # exclude:
+  #   - test/**

lib/latlong/LatLng.dart

@@ -67,7 +67,7 @@ class LatLng {
 
     int get hashCode => latitude.hashCode + longitude.hashCode;
 
-    bool operator==(final LatLng other)
+    bool operator==(final Object other)
         => other is LatLng && latitude == other.latitude && longitude == other.longitude;
 
     LatLng round({ final int decimals: 6 })

lib/latlong/Path.dart

@@ -152,7 +152,7 @@ class Path<T extends LatLng> {
                     // Add step on the given path
                     // Intermediate step is necessary to stay type-safe
                     final LatLng tempStep = _distance.offset(baseStep,firstStepPos,bearing);
-                    final T nextStep = _latLngFactory(tempStep.latitude,tempStep.longitude);
+                    final LatLng nextStep = _latLngFactory(tempStep.latitude,tempStep.longitude);
                     path.add(nextStep);
                     firstStepPos += stepDistance;
 
@@ -238,7 +238,7 @@ class Path<T extends LatLng> {
     /// Calculates the center of a collection of geo coordinates
     ///
     /// The function rounds the result to 6 decimals
-    T get center {
+    LatLng get center {
         Validate.notEmpty(coordinates,"Coordinates must not be empty!");
 
         double X = 0.0;
@@ -287,7 +287,7 @@ class Path<T extends LatLng> {
     //- private -----------------------------------------------------------------------------------
 
     /// 4 Points are necessary to create a [CatmullRomSpline2D]
-    CatmullRomSpline2D<double> _createSpline(final T p0,final T p1,final T p2,final T p3) {
+    CatmullRomSpline2D<double> _createSpline(final LatLng p0,final LatLng p1,final LatLng p2,final LatLng p3) {
         Validate.notNull(p0);
         Validate.notNull(p1);
         Validate.notNull(p2);
@@ -302,6 +302,6 @@ class Path<T extends LatLng> {
     }
 
     /// Convert [Point2D] to [LatLng]
-    T _pointToLatLng(final Point2D point) => _latLngFactory(point.x,point.y);
+    LatLng _pointToLatLng(final Point2D point) => _latLngFactory(point.x,point.y);
 }
 

lib/latlong/interfaces.dart

@@ -20,6 +20,6 @@
 part of latlong;
 
 abstract class DistanceCalculator {
-    double distance(final LatLng p1, final LatLng p2);
+    num distance(final LatLng p1, final LatLng p2);
     LatLng offset(final LatLng from,final double distanceInMeter,final double bearing);
 }

tool/grind.dart

@@ -1,6 +1,6 @@
 import 'package:grinder/grinder.dart';
 
-main(args) => grind(args);
+main(final List<String> args) => grind(args);
 
 @DefaultTask()
 @Depends(test)