✨ Allows not enable the image integration (#645)

## What does this change?

Adds the explicit and configurable image integration.

Resolves #636 🎯

## Type of change

- [x] New feature (non-breaking change which adds functionality)
- [x] This change requires a documentation update

README.md

@@ -147,6 +147,7 @@ flutter_gen:
 
   # Optional
   integrations:
+    image: true
     flutter_svg: true
     rive: true
     lottie: true
@@ -370,6 +371,15 @@ Widget build(BuildContext context) {
 
 ```
 
+If you do not want to generate `AssetGenImage`, set `flutter_gen > integrations > image` to `false`.
+
+```yaml
+# pubspec.yaml
+flutter_gen:
+  integrations:
+    image: false
+```
+
 If you are using SVG images with [flutter_svg](https://pub.dev/packages/flutter_svg) you can use the integration feature.
 
 ```yaml

packages/core/lib/generators/assets_generator.dart

@@ -59,10 +59,11 @@ Future<String> generateAssets(
   }
 
   final integrations = <Integration>[
-    ImageIntegration(
-      config.packageParameterLiteral,
-      parseMetadata: config.flutterGen.parseMetadata,
-    ),
+    if (config.flutterGen.integrations.image)
+      ImageIntegration(
+        config.packageParameterLiteral,
+        parseMetadata: config.flutterGen.parseMetadata,
+      ),
     if (config.flutterGen.integrations.flutterSvg)
       SvgIntegration(
         config.packageParameterLiteral,

packages/core/lib/settings/config_default.dart

@@ -11,6 +11,7 @@ flutter_gen:
 
   # Optional
   integrations:
+    image: true
     flutter_svg: false
     rive: false
     lottie: false

packages/core/lib/settings/pubspec.dart

@@ -157,6 +157,7 @@ class FlutterGenFonts {
 @JsonSerializable()
 class FlutterGenIntegrations {
   const FlutterGenIntegrations({
+    required this.image,
     required this.flutterSvg,
     required this.rive,
     required this.lottie,
@@ -165,6 +166,9 @@ class FlutterGenIntegrations {
   factory FlutterGenIntegrations.fromJson(Map json) =>
       _$FlutterGenIntegrationsFromJson(json);
 
+  @JsonKey(name: 'image', required: true)
+  final bool image;
+
   @JsonKey(name: 'flutter_svg', required: true)
   final bool flutterSvg;
 

packages/core/test/assets_gen_integrations_test.dart

@@ -31,6 +31,7 @@ class TestIntegration extends Integration {
 void main() {
   group('Test Assets Integration generator', () {
     final resPath = p.absolute('test_resources');
+
     test('Assets with No integrations on pubspec.yaml', () async {
       const pubspec = 'test_resources/pubspec_assets_no_integrations.yaml';
       const fact = 'test_resources/actual_data/assets_no_integrations.gen.dart';
@@ -40,6 +41,16 @@ void main() {
       await expectedAssetsGen(pubspec, generated, fact);
     });
 
+    test('Assets with no image integration', () async {
+      const pubspec = 'test_resources/pubspec_assets_no_image_integration.yaml';
+      const fact =
+          'test_resources/actual_data/assets_no_image_integration.gen.dart';
+      const generated =
+          'test_resources/lib/gen/assets_no_image_integration.gen.dart';
+
+      await expectedAssetsGen(pubspec, generated, fact);
+    });
+
     test('Integration.classInstantiate', () {
       expect(
         TestIntegration().classInstantiate(

packages/core/test_resources/pubspec_assets_no_image_integration.yaml

@@ -0,0 +1,21 @@
+name: test
+
+flutter_gen:
+  output: lib/gen/ # Optional (default: lib/gen/)
+  line_length: 80 # Optional (default: 80)
+
+  integrations:
+    image: false
+
+flutter:
+  assets:
+    - assets/images
+    - assets/images/chip3/chip3.jpg
+    - assets/images/chip3/chip3.jpg # duplicated
+    - assets/images/chip4/
+    - assets/images/icons/fuchsia.svg
+    - assets/images/icons/kmm.svg
+    - assets/images/icons/paint.svg
+    - assets/images/icons/dart@test.svg
+    - assets/json/
+    - pictures/chip5.jpg