### Add Dependencies for json_serializable

Source: https://pub.dev/documentation/build_runner/latest

Example dependencies to include in pubspec.yaml for using the json_serializable builder.

```yaml
dependencies:
  json_annotation: ^4.9.0

dev_dependencies:
  build_runner: ^2.6.0
  json_serializable: ^6.10.0

```

--------------------------------

### Launch build_runner Watch Mode

Source: https://pub.dev/documentation/build_runner/latest

Command to start build_runner in watch mode, which rebuilds automatically on source code changes.

```bash
cd <package root folder>
dart run build_runner watch

```

--------------------------------

### Update Person Class for json_serializable

Source: https://pub.dev/documentation/build_runner/latest

Example of updating a class to include a new field, demonstrating how watch mode recompiles generated code.

```dart
@JsonSerializable()
class Person {
  final String name;
  final DateTime? dateOfBirth;
  // Added.
  final int age;

  // Updated manually.
  Person({required this.name, this.dateOfBirth, this.age});

  // No change needed, the generated implementations referenced get updated.
  Map<String, dynamic> toJson() => _$PersonToJson(this);
  factory Person.fromJson(Map<String, dynamic> json) => _$PersonFromJson(json);
}

```

--------------------------------

### Activate json_serializable Builder

Source: https://pub.dev/documentation/build_runner/latest

Demonstrates how to activate the json_serializable builder using annotations and generated files.

```dart
import 'package:json_annotation/json_annotation.dart';

// Include the file that the builder will generate.
part 'example.g.dart';

// Activate the builder.
@JsonSerializable()
class Person {
  final String name;
  final DateTime? dateOfBirth;

  Person({required this.name, this.dateOfBirth});

  // Wire up the generated `toJson` in `example.g.dart`.
  Map<String, dynamic> toJson() => _$PersonToJson(this);

  // Wire up the generated `fromJson` in `example.g.dart`.
  factory Person.fromJson(Map<String, dynamic> json) => _$PersonFromJson(json);
}

```

--------------------------------

### Perform a Single Build with build_runner

Source: https://pub.dev/documentation/build_runner/latest

Command to execute a single build using the build_runner CLI.

```bash
cd <package root folder>
dart run build_runner build

```

--------------------------------

### Configure Freezed Builder Options

Source: https://pub.dev/documentation/build_runner/latest

Customize the Freezed builder's behavior, such as controlling output formatting and the generation of copyWith and equality methods.

```yaml
targets:
  $default:
    builders:
      freezed:
        options:
          # Do format output.
          format: true
          # Don't generate `copyWith` or `operator==`.
          copy_with: false
          equal: false

```

--------------------------------

### Configure json_serializable Builder Options

Source: https://pub.dev/documentation/build_runner/latest

Restrict the json_serializable builder to only run on specific files within your package by specifying a glob pattern.

```yaml
targets:
  $default:
    builders:
      json_serializable:
        generate_for:
          # Only run `json_serializable` on source under `lib/models`.
          - lib/models/*.dart

```

--------------------------------

### Enable Debugging for build_runner Builds

Source: https://pub.dev/documentation/build_runner/latest

Pass debugging arguments to the Dart VM when running build_runner to enable the Dart DevTools debugger and profiler.

```bash
dart run build_runner build --dart-jit-vm-arg=--observe --dart-jit-vm-arg=--pause-isolates-on-start

```

--------------------------------

### Ignore .dart_tool Directory in Git

Source: https://pub.dev/documentation/build_runner/latest

Add this line to your .gitignore file to prevent build_runner's internal files from being tracked by Git.

```yaml
.dart_tool

```

--------------------------------

### Dart DevTools Debugger URL

Source: https://pub.dev/documentation/build_runner/latest

This URL is outputted when debugging is enabled, allowing you to connect to the Dart DevTools for debugging and profiling.

```text
The Dart DevTools debugger and profiler is available at:
http://127.0.0.1:8181/3xXtAPE8msc=/devtools/?uri=ws://127.0.0.1:8181/3xXtAPE8msc=/ws

```

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