fix: #323 TypeError when list json with lottie (#324)

Author: wasabeef

example/assets/json/list.json

@@ -0,0 +1,5 @@
+[
+  {
+    "id": "ABC42"
+  }
+]

example/assets/json/fruits.json renamed to example/assets/json/map.json

@@ -56,11 +56,14 @@ class $AssetsImagesGen {
 class $AssetsJsonGen {
   const $AssetsJsonGen();
 
-  /// File path: assets/json/fruits.json
-  String get fruits => 'assets/json/fruits.json';
+  /// File path: assets/json/list.json
+  String get list => 'assets/json/list.json';
+
+  /// File path: assets/json/map.json
+  String get map => 'assets/json/map.json';
 
   /// List of all assets
-  List<String> get values => [fruits];
+  List<String> get values => [list, map];
 }
 
 class $AssetsLottieGen {

example/lib/gen/assets.gen.dart

@@ -166,7 +166,7 @@ flutter:
     - assets/images/icons/kmm.svg
     - assets/images/icons/paint.svg
     - assets/images/icons/[email protected]
-    - assets/json/fruits.json
+    - assets/json/
     - pictures/chip5.jpg
     - assets/flare/
     - assets/rive/

example/pubspec.yaml

@@ -120,6 +120,9 @@ class LottieIntegration extends Integration {
     } on FormatException catch (e) {
       // Catches bad/corrupted json and reports it to user.
       stderr.writeln(e.message);
+    } on TypeError catch(e) {
+      // Catches bad/corrupted json and reports it to user.
+      stderr.writeln(e);
     }
     return false;
   }

packages/core/lib/generators/integrations/lottie_integration.dart

@@ -50,7 +50,7 @@ void main() {
       expect(colorPath.isXml, isTrue);
 
       const wrongColorPath =
-          ColorPath('test_resources/assets/json/fruits.json');
+          ColorPath('test_resources/assets/json/map.json');
       expect(wrongColorPath.isXml, isFalse);
     });