Code review suggestions

lib/src/booleans/boolean_contains.dart

@@ -12,22 +12,22 @@ import 'boolean_helper.dart';
 /// [booleanContains] returns the exact opposite result of the [booleanWithin].
 /// example:
 /// ```dart
-/// var line = LineString(coordinates: [
+/// final line = LineString(coordinates: [
 ///   Position.of([1, 1]),
 ///   Position.of([1, 2]),
 ///   Position.of([1, 3]),
 ///   Position.of([1, 4])
 /// ]);
-/// var point = Point(coordinates: Position.of([1, 2]));
+/// final point = Point(coordinates: Position.of([1, 2]));
 /// booleanContains(line, point);
 /// //=true
 /// ```
 bool booleanContains(GeoJSONObject feature1, GeoJSONObject feature2) {
-  var geom1 = getGeom(feature1);
-  var geom2 = getGeom(feature2);
+  final geom1 = getGeom(feature1);
+  final geom2 = getGeom(feature2);
 
-  var coords1 = (geom1 as GeometryType).coordinates;
-  var coords2 = (geom2 as GeometryType).coordinates;
+  final coords1 = (geom1 as GeometryType).coordinates;
+  final coords2 = (geom2 as GeometryType).coordinates;
   if (geom1 is Point) {
     if (geom2 is Point) {
       return coords1 == coords2;
@@ -73,14 +73,14 @@ bool booleanContains(GeoJSONObject feature1, GeoJSONObject feature2) {
 /// Is Polygon2 in Polygon1
 /// Only takes into account outer rings
 bool _isPolyInPoly(GeoJSONObject geom1, GeoJSONObject geom2) {
-  var poly1Bbox = bbox(geom1);
-  var poly2Bbox = bbox(geom2);
+  final poly1Bbox = bbox(geom1);
+  final poly2Bbox = bbox(geom2);
   if (!_doBBoxesOverlap(poly1Bbox, poly2Bbox)) {
     return false;
   }
 
-  for (var ring in (geom2 as GeometryType).coordinates) {
-    for (var coord in ring) {
+  for (final ring in (geom2 as GeometryType).coordinates) {
+    for (final coord in ring) {
       if (!booleanPointInPolygon(coord, geom1)) {
         return false;
       }

lib/src/booleans/boolean_helper.dart

@@ -117,8 +117,8 @@ bool isLineInMultiPolygon(LineString line, MultiPolygon polygon) =>
     _isLineInGeoJsonPolygon(line, polygon);
 
 bool _isLineInGeoJsonPolygon(LineString line, GeoJSONObject polygon) {
-  var boundingBoxOfPolygon = bbox(polygon);
-  var boundingBoxOfLine = bbox(line);
+  final boundingBoxOfPolygon = bbox(polygon);
+  final boundingBoxOfLine = bbox(line);
 
   if (!_doBBoxesOverlap(boundingBoxOfPolygon, boundingBoxOfLine)) {
     return false;
@@ -197,8 +197,8 @@ bool _isPolygonInGeoJsonPolygon(
   Polygon polygon1,
   GeoJSONObject polygon2,
 ) {
-  var boundingBoxOfPolygon1 = bbox(polygon1);
-  var boundingBoxOfPolygon2 = bbox(polygon2);
+  final boundingBoxOfPolygon1 = bbox(polygon1);
+  final boundingBoxOfPolygon2 = bbox(polygon2);
   if (!_doBBoxesOverlap(boundingBoxOfPolygon2, boundingBoxOfPolygon1)) {
     return false;
   }

test/booleans/within_test.dart

@@ -45,8 +45,8 @@ void main() {
           (path, geoJson) {
         final multiPolygon = (geoJson as Feature);
         final pointInHole = point([-86.69208526611328, 36.20373274711739]);
-        var pointInPolygon = point([-86.72229766845702, 36.20258997094334]);
-        var pointInSecondPolygon =
+        final pointInPolygon = point([-86.72229766845702, 36.20258997094334]);
+        final pointInSecondPolygon =
             point([-86.75079345703125, 36.18527313913089]);
 
         expect(booleanWithin(pointInHole, multiPolygon), false,
@@ -59,7 +59,7 @@ void main() {
     });
 
     test("within - point in polygon", () {
-      var simplePolygon = polygon([
+      final simplePolygon = polygon([
         [
           [0, 0],
           [0, 100],
@@ -68,15 +68,15 @@ void main() {
           [0, 0],
         ],
       ]);
-      var pointIn = point([50, 50]);
-      var pointOut = point([140, 150]);
+      final pointIn = point([50, 50]);
+      final pointOut = point([140, 150]);
 
       expect(booleanWithin(pointIn, simplePolygon), true,
           reason: "point inside polygon");
       expect(booleanWithin(pointOut, simplePolygon), false,
           reason: "point outside polygon");
 
-      var concavePolygon = polygon([
+      final concavePolygon = polygon([
         [
           [0, 0],
           [50, 50],
@@ -87,8 +87,8 @@ void main() {
         ],
       ]);
 
-      var pointInConcave = point([75, 75]);
-      var pointOutConcave = point([25, 50]);
+      final pointInConcave = point([75, 75]);
+      final pointOutConcave = point([25, 50]);
 
       expect(booleanWithin(pointInConcave, concavePolygon), true,
           reason: "point inside concave polygon");
@@ -108,9 +108,9 @@ void loadGeoJson(
 
 void loadGeoJsonFiles(
     String path, void Function(String path, GeoJSONObject geoJson) test) {
-  var testDirectory = Directory(path);
+  final testDirectory = Directory(path);
 
-  for (var file in testDirectory.listSync(recursive: true)) {
+  for (final file in testDirectory.listSync(recursive: true)) {
     if (file is File && file.path.endsWith('.geojson')) {
       if (file.path.contains('skip')) continue;