Json_serializable.dart: Unable to generate *.g.dart files running `flutter pub run build_runner build` inside a package project

Created on 25 Dec 2019 · 5Comments · Source: google/json_serializable.dart

I'm creating 2 apps that shares the same code base (including their models), so I created a base package that I share across them.

The problem is that I'm not able to generate the related *.g.dart files for my respective models from the package.

This is what I got when I run the build command inside the package project:

[INFO] Generating build script...
[INFO] Generating build script completed, took 220ms

[WARNING] Configuring `json_serializable:json_serializable` in target `code_base:code_base` but this is not a known Builder
[SEVERE] Nothing can be built, yet a build was requested.
[INFO] Initializing inputs
[INFO] Reading cached asset graph...
[INFO] Reading cached asset graph completed, took 55ms

[INFO] Checking for updates since last build...
[INFO] Checking for updates since last build completed, took 392ms

[INFO] Running build...
[INFO] Running build completed, took 2ms

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 54ms

[INFO] Succeeded after 65ms with 0 outputs (0 actions)

This is my pubspec.yaml:

name: code_base
description: Project base code
version: 0.0.1
author:
homepage:

environment:
  sdk: ">=2.2.2 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  dio: ^3.0.7
  flutter_bloc: ^2.1.1
  shared_preferences: ^0.5.6
  connectivity: ^0.4.6+1
  firebase_messaging: ^6.0.9

dev_dependencies:
  flutter_test:
    sdk: flutter
  build_runner: ^1.0.0
  json_annotation: ^3.0.0

# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # To add assets to your package, add an assets section, like this:
  # assets:
  #  - images/a_dot_burr.jpeg
  #  - images/a_dot_ham.jpeg
  #
  # For details regarding assets in packages, see
  # https://flutter.dev/assets-and-images/#from-packages
  #
  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # To add custom fonts to your package, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts in packages, see
  # https://flutter.dev/custom-fonts/#from-packages

build.yaml:

targets:
  $default:
    builders:
      json_serializable:
        options:
          # Options configure how source code is generated for every
          # `@JsonSerializable`-annotated class in the package.
          #
          # The default value for each is listed.
          any_map: false
          checked: false
          create_factory: true
          create_to_json: true
          disallow_unrecognized_keys: false
          explicit_to_json: true
          field_rename: none
          ignore_unannotated: false
          include_if_null: true
          nullable: true

Flutter 1.12.13+hotfix.5 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 27321ebbad (2 weeks ago) • 2019-12-10 18:15:01 -0800
Engine • revision 2994f7e1e6
Tools • Dart 2.7.0

Source