FromJson method and g.dart file are not generated

[orestesgaolin]

After running on current stable 1.12.13+hotfix.8:

flutter clean
flutter pub get
flutter pub run build_runner build --define "json_serializable=any_map=true" --delete-conflicting-outputs

I see that:

• g.dart files are not generated
• FromJson methods are not generated and following errors are visible in VS Code Problems pane:

The method '_$_$_ApiResultFromJson' isn't defined for the class '_$_ApiResult'.
Try correcting the name to the name of an existing method, or defining a method named '_$_$_ApiResultFromJson'.

Target of URI hasn't been generated: 'api_result.g.dart'.
Try running the generator that will generate the file referenced by the URI.

Model classes:

api_result.dart

import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:flutter/foundation.dart';
import 'record.dart';

part 'api_result.freezed.dart';
part 'api_result.g.dart';

@freezed
abstract class ApiResult with _$ApiResult {
  const factory ApiResult(
    @JsonKey(name: 'records') List<Record> records,
    @JsonKey(name: 'q') String query,
    @JsonKey(name: 'resource_id') String resourceId,
    @JsonKey(name: 'include_total') bool includeTotal,
    @JsonKey(name: '_links') Map<String, String> links,
    @JsonKey(name: 'total') int total,
  ) = _ApiResult;

  factory ApiResult.fromJson(Map<String, dynamic> json) =>
      _$ApiResultFromJson(json);
  // Map<String, dynamic> toJson() => _$ApiResultToJson(this);
}

and record.dart

import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:flutter/foundation.dart';

part 'record.freezed.dart';
part 'record.g.dart';

@freezed
abstract class Record with _$Record {
  const factory Record(
    @JsonKey(name: '_id') int id,
    @JsonKey(name: 'Identyfikator') int longId,
    @JsonKey(name: 'Nazwa') String name,
    @JsonKey(name: 'Synonim') String synonyms,
    @JsonKey(name: 'Typ') String type,
    @JsonKey(name: 'rank', nullable: true) double rank,
    @JsonKey(name: 'additionalInfo', nullable: true) String additionalInfo,
  ) = _Record;

  factory Record.fromJson(Map<String, dynamic> json) => _$RecordFromJson(json);
  // Map<String, dynamic> toJson() => toJson(this);
}

---

My pubspec dependencies are:

dependencies:
  flutter:
    sdk: flutter
  freezed_annotation: ^0.7.1
  json_serializable: ^3.2.5

dev_dependencies:
  flutter_test:
    sdk: flutter
  build_runner:
  freezed: ^0.8.2

And flutter doctor output:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.12.13+hotfix.8, on Mac OS X 10.15.3 19D76, locale pl-PL)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
[✓] Android Studio (version 3.5)
[✓] VS Code (version 1.42.1)
[✓] Connected device (1 available)

• No issues found!

[orestesgaolin]

Adding build.yaml file from here solved the problem:

targets:
  $default:
    builders:
      freezed|freezed:
        enabled: false

builders:
  freezed:
    import: "package:freezed/builder.dart"
    builder_factories: ["freezed"]
    build_extensions: { ".dart": [".freezed.dart"] }
    auto_apply: dependents
    build_to: source
    runs_before:
      - json_serializable|json_serializable
      - source_gen|combining_builder

[orestesgaolin]

Ok, I don't get it but now it doesn't work anymore. I removed one property from Record class and now no files are generated at all. I cleaned the project, removed .dart-tool directory and tried several times with and without build.yaml.

So to sum up this is how it looks now:

record.dart

import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:flutter/foundation.dart';

part 'record.g.dart';
part 'record.freezed.dart';

@freezed
abstract class Record with _$Record {
  const factory Record(
    @JsonKey(name: '_id') int id,
    @JsonKey(name: 'Identyfikator') int longId,
    @JsonKey(name: 'Nazwa') String name,
    @JsonKey(name: 'Synonim') String synonyms,
    @JsonKey(name: 'Typ') String type,
    @JsonKey(name: 'additionalInfo', nullable: true) String additionalInfo,
  ) = _Record;

  factory Record.fromJson(Map<String, dynamic> json) => _$RecordFromJson(json);
  // Map<String, dynamic> toJson() => toJson(this);
}

api_result.dart

import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:flutter/foundation.dart';
import 'record.dart';

part 'api_result.freezed.dart';
part 'api_result.g.dart';

@freezed
abstract class ApiResult with _$ApiResult {
  const factory ApiResult(
    @JsonKey(name: 'records') List<Record> records,
    @JsonKey(name: 'q') String query,
    @JsonKey(name: 'resource_id') String resourceId,
    @JsonKey(name: 'include_total') bool includeTotal,
    @JsonKey(name: '_links') Map<String, String> links,
    @JsonKey(name: 'total') int total,
  ) = _ApiResult;

  factory ApiResult.fromJson(Map<String, dynamic> json) =>
      _$ApiResultFromJson(json);
  // Map<String, dynamic> toJson() => _$ApiResultToJson(this);
}

targets:
  $default:
    builders:
      freezed|freezed:
        enabled: false

builders:
  freezed:
    import: "package:freezed/builder.dart"
    builder_factories: ["freezed"]
    build_extensions: { ".dart": [".freezed.dart"] }
    auto_apply: dependents
    build_to: source
    runs_before:
      - json_serializable|json_serializable
      - source_gen|combining_builder

commands:

> rm -rf ./.dart_tool
> flutter clean
Cleaning Xcode workspace...                                         3,0s
Deleting .dart_tool...
> flutter pub get
Running "flutter pub get" in recycleapp...
> flutter pub run build_runner build
[INFO] Generating build script...
[INFO] Generating build script completed, took 297ms

[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed, took 8.8s

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 499ms

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 1ms

[INFO] Running build...
[INFO] Generating SDK summary...
[INFO] 2.9s elapsed, 0/16 actions completed.
[INFO] Generating SDK summary completed, took 2.8s

[INFO] 3.9s elapsed, 3/19 actions completed.
[INFO] 5.0s elapsed, 3/19 actions completed.
[INFO] 6.2s elapsed, 3/19 actions completed.
[INFO] 7.2s elapsed, 4/20 actions completed.
[INFO] 8.3s elapsed, 5/21 actions completed.
[INFO] 10.4s elapsed, 6/21 actions completed.
[INFO] 13.7s elapsed, 8/21 actions completed.
[INFO] 15.0s elapsed, 21/21 actions completed.
[INFO] Running build completed, took 15.1s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 62ms

[INFO] Succeeded after 15.1s with 0 outputs (42 actions)

If I remove build.yaml file then we come back to the initial problem with The method _$_$_ApiResultFromJson' isn't defined for the class '_$_ApiResult:

> flutter pub run build_runner build
[INFO] Generating build script...
[INFO] Generating build script completed, took 283ms

[INFO] Initializing inputs
[INFO] Reading cached asset graph...
[WARNING] Throwing away cached asset graph because the build phases have changed. This most commonly would happen as a result of adding a new dependency or updating your dependencies.
[INFO] Cleaning up outputs from previous builds....
[INFO] Cleaning up outputs from previous builds. completed, took 4ms

[INFO] Generating build script...
[INFO] Generating build script completed, took 58ms

[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed, took 8.3s

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 489ms

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 1ms

[INFO] Running build...
[INFO] 1.0s elapsed, 3/19 actions completed.
[INFO] 2.1s elapsed, 3/19 actions completed.
[INFO] 3.1s elapsed, 3/19 actions completed.
[INFO] 4.3s elapsed, 3/19 actions completed.
[INFO] 5.3s elapsed, 5/19 actions completed.
[INFO] 9.7s elapsed, 6/21 actions completed.
[INFO] 10.8s elapsed, 7/21 actions completed.
[INFO] 11.8s elapsed, 20/21 actions completed.
[INFO] Running build completed, took 12.7s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 45ms

[INFO] Succeeded after 12.7s with 2 outputs (67 actions)

[rrousselGit]

What is the version of build_runner that you are using?

[orestesgaolin]

Hi @rrousselGit. I was hacking around and finally just removed everything that could affect this i.e.:

• pubspec.lock,
• build folder,
• dart-tool,
• turned off and on terminal and VS Code,
• and changed build.yaml to following (it didn't generate g.dart files with that previously):

targets:
  $default:
    builders:
      freezed|freezed:
        enabled: true

builders:
  freezed:
    import: "package:freezed/builder.dart"
    builder_factories: ["freezed"]
    build_extensions: { ".dart": [".freezed.dart"] }
    auto_apply: dependents
    build_to: source
    runs_before:
      - json_serializable|json_serializable
      - source_gen|combining_builder

Build_runner is at 1.7.4 right now and it seems it's working. The most annoying part was that it worked once and then stopped only after removing one property from the model class.

Now I see in the log that both freezed and json_serializable builders are running in proper order:

[amebrahimi]

Hello, I have this problem too.

This is my pubspec.yaml

targets:
  $default:
    builders:
      freezed|freezed:
        enabled: false

builders:
  freezed:
    import: "package:freezed/builder.dart"
    builder_factories: ["freezed"]
    build_extensions: { ".dart": [".freezed.dart"] }
    auto_apply: dependents
    build_to: source
    runs_before:
      - json_serializable|json_serializable
      - source_gen|combining_builder

name: project
description: A new Flutter project.

version: 1.0.0+1

environment:
  sdk: ">=2.6.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  chopper: ^3.0.2
  cupertino_icons: ^0.1.2
  http: ^0.12.0+4
  built_value: ^7.0.8
  injectable: ^0.1.0
  get_it: ^3.1.0
  dartz: ^0.8.9
  equatable: ^1.0.3
  data_connection_checker: ^0.3.4
  flutter_html: ^0.11.1
  flutter_auth_buttons: ^0.6.0
  flutter_facebook_login: ^3.0.0
  google_sign_in: ^4.1.1
  sqflite: ^1.2.1
  url_launcher: ^5.4.1
  provider: ^4.0.4
  freezed_annotation: ^0.7.1

dev_dependencies:
  flutter_test:
    sdk: flutter
  built_value_generator: ^7.0.8
  injectable_generator: ^0.1.0
  build_runner:
  lint: ^1.1.1
  chopper_generator: ^3.0.4
  freezed: ^0.9.2

flutter:
  fonts:
    - family: MyFlutterApp
      fonts:
        - asset: fonts/MyFlutterApp.ttf

  uses-material-design: true
  assets:
    - assets/ic_facebook.png
    - assets/ic_google.png
    - assets/privacy_and_policy.html

And even if I clean the project, delete the build folder delete pubspec.lock, etc... It will never generate my order.g.dart file.

Here is the freezed class

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

part 'order.g.dart';
part 'order.freezed.dart';

@freezed
abstract class Order with _$Order {
  const factory Order({
    @JsonKey(name: "Eto_mey") String name,
    int age,
  }) = _Order;

  factory Order.fromJson(Map<String, dynamic> json) => _$OrderFromJson(json);
}

and here is the generated freeezd class

// GENERATED CODE - DO NOT MODIFY BY HAND
// ignore_for_file: deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named

part of 'order.dart';

// **************************************************************************
// FreezedGenerator
// **************************************************************************

Order _$OrderFromJson(Map<String, dynamic> json) {
  return _Order.fromJson(json);
}

mixin _$Order {
  @JsonKey(name: 'Eto_mey')
  String get name;
  int get age;

  Order copyWith({@JsonKey(name: 'Eto_mey') String name, int age});

  Map<String, dynamic> toJson();
}

class _$OrderTearOff {
  const _$OrderTearOff();

  _Order call({@JsonKey(name: 'Eto_mey') String name, int age}) {
    return _Order(
      name: name,
      age: age,
    );
  }
}

const $Order = _$OrderTearOff();

@JsonSerializable()
class _$_Order implements _Order {
  const _$_Order({@JsonKey(name: 'Eto_mey') this.name, this.age});

  factory _$_Order.fromJson(Map<String, dynamic> json) =>
      _$_$_OrderFromJson(json);

  @override
  @JsonKey(name: 'Eto_mey')
  final String name;
  @override
  final int age;

  @override
  String toString() {
    return 'Order(name: $name, age: $age)';
  }

  @override
  bool operator ==(dynamic other) {
    return identical(this, other) ||
        (other is _Order &&
            (identical(other.name, name) ||
                const DeepCollectionEquality().equals(other.name, name)) &&
            (identical(other.age, age) ||
                const DeepCollectionEquality().equals(other.age, age)));
  }

  @override
  int get hashCode =>
      runtimeType.hashCode ^
      const DeepCollectionEquality().hash(name) ^
      const DeepCollectionEquality().hash(age);

  @override
  _$_Order copyWith({
    Object name = freezed,
    Object age = freezed,
  }) {
    return _$_Order(
      name: name == freezed ? this.name : name as String,
      age: age == freezed ? this.age : age as int,
    );
  }

  @override
  Map<String, dynamic> toJson() {
    return _$_$_OrderToJson(this);
  }
}

abstract class _Order implements Order {
  const factory _Order({@JsonKey(name: 'Eto_mey') String name, int age}) =
      _$_Order;

  factory _Order.fromJson(Map<String, dynamic> json) = _$_Order.fromJson;

  @override
  @JsonKey(name: 'Eto_mey')
  String get name;
  @override
  int get age;

  @override
  _Order copyWith({@JsonKey(name: 'Eto_mey') String name, int age});
}

This is my pubspec.lock

# Generated by pub
# See https://dart.dev/tools/pub/glossary#lockfile
packages:
  _fe_analyzer_shared:
    dependency: transitive
    description:
      name: _fe_analyzer_shared
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.3"
  analyzer:
    dependency: transitive
    description:
      name: analyzer
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.39.4"
  archive:
    dependency: transitive
    description:
      name: archive
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.0.11"
  args:
    dependency: transitive
    description:
      name: args
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.5.2"
  async:
    dependency: transitive
    description:
      name: async
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.4.0"
  boolean_selector:
    dependency: transitive
    description:
      name: boolean_selector
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.5"
  build:
    dependency: transitive
    description:
      name: build
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.2.2"
  build_config:
    dependency: transitive
    description:
      name: build_config
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.4.2"
  build_daemon:
    dependency: transitive
    description:
      name: build_daemon
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.1.3"
  build_resolvers:
    dependency: transitive
    description:
      name: build_resolvers
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.3.3"
  build_runner:
    dependency: "direct dev"
    description:
      name: build_runner
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.8.0"
  build_runner_core:
    dependency: transitive
    description:
      name: build_runner_core
      url: "https://pub.dartlang.org"
    source: hosted
    version: "4.5.2"
  built_collection:
    dependency: transitive
    description:
      name: built_collection
      url: "https://pub.dartlang.org"
    source: hosted
    version: "4.3.2"
  built_value:
    dependency: "direct main"
    description:
      name: built_value
      url: "https://pub.dartlang.org"
    source: hosted
    version: "7.0.9"
  built_value_generator:
    dependency: "direct dev"
    description:
      name: built_value_generator
      url: "https://pub.dartlang.org"
    source: hosted
    version: "7.0.9"
  charcode:
    dependency: transitive
    description:
      name: charcode
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.2"
  checked_yaml:
    dependency: transitive
    description:
      name: checked_yaml
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.2"
  chopper:
    dependency: "direct main"
    description:
      name: chopper
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.0.2"
  chopper_generator:
    dependency: "direct dev"
    description:
      name: chopper_generator
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.0.4"
  code_builder:
    dependency: transitive
    description:
      name: code_builder
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.2.1"
  collection:
    dependency: transitive
    description:
      name: collection
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.14.11"
  convert:
    dependency: transitive
    description:
      name: convert
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.1.1"
  crypto:
    dependency: transitive
    description:
      name: crypto
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.1.3"
  csslib:
    dependency: transitive
    description:
      name: csslib
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.16.1"
  cupertino_icons:
    dependency: "direct main"
    description:
      name: cupertino_icons
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.1.3"
  dart_style:
    dependency: transitive
    description:
      name: dart_style
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.3.3"
  dartz:
    dependency: "direct main"
    description:
      name: dartz
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.8.9"
  data_connection_checker:
    dependency: "direct main"
    description:
      name: data_connection_checker
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.3.4"
  equatable:
    dependency: "direct main"
    description:
      name: equatable
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.1"
  fixnum:
    dependency: transitive
    description:
      name: fixnum
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.10.11"
  flutter:
    dependency: "direct main"
    description: flutter
    source: sdk
    version: "0.0.0"
  flutter_auth_buttons:
    dependency: "direct main"
    description:
      name: flutter_auth_buttons
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.6.0"
  flutter_facebook_login:
    dependency: "direct main"
    description:
      name: flutter_facebook_login
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.0.0"
  flutter_html:
    dependency: "direct main"
    description:
      name: flutter_html
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.11.1"
  flutter_test:
    dependency: "direct dev"
    description: flutter
    source: sdk
    version: "0.0.0"
  flutter_web_plugins:
    dependency: transitive
    description: flutter
    source: sdk
    version: "0.0.0"
  freezed:
    dependency: "direct dev"
    description:
      name: freezed
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.9.2"
  freezed_annotation:
    dependency: "direct main"
    description:
      name: freezed_annotation
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.7.1"
  get_it:
    dependency: "direct main"
    description:
      name: get_it
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.1.0"
  glob:
    dependency: transitive
    description:
      name: glob
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.2.0"
  google_sign_in:
    dependency: "direct main"
    description:
      name: google_sign_in
      url: "https://pub.dartlang.org"
    source: hosted
    version: "4.1.4"
  google_sign_in_platform_interface:
    dependency: transitive
    description:
      name: google_sign_in_platform_interface
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.4"
  google_sign_in_web:
    dependency: transitive
    description:
      name: google_sign_in_web
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.8.3+2"
  graphs:
    dependency: transitive
    description:
      name: graphs
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.2.0"
  html:
    dependency: transitive
    description:
      name: html
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.14.0+3"
  http:
    dependency: "direct main"
    description:
      name: http
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.12.0+4"
  http_multi_server:
    dependency: transitive
    description:
      name: http_multi_server
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.2.0"
  http_parser:
    dependency: transitive
    description:
      name: http_parser
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.1.3"
  image:
    dependency: transitive
    description:
      name: image
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.1.4"
  injectable:
    dependency: "direct main"
    description:
      name: injectable
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.1.0"
  injectable_generator:
    dependency: "direct dev"
    description:
      name: injectable_generator
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.1.0"
  io:
    dependency: transitive
    description:
      name: io
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.3.3"
  js:
    dependency: transitive
    description:
      name: js
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.6.1+1"
  json_annotation:
    dependency: transitive
    description:
      name: json_annotation
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.0.1"
  lint:
    dependency: "direct dev"
    description:
      name: lint
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.1"
  logging:
    dependency: transitive
    description:
      name: logging
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.11.4"
  matcher:
    dependency: transitive
    description:
      name: matcher
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.12.6"
  meta:
    dependency: transitive
    description:
      name: meta
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.8"
  mime:
    dependency: transitive
    description:
      name: mime
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.9.6+3"
  nested:
    dependency: transitive
    description:
      name: nested
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.0.4"
  node_interop:
    dependency: transitive
    description:
      name: node_interop
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.3"
  node_io:
    dependency: transitive
    description:
      name: node_io
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.1+2"
  package_config:
    dependency: transitive
    description:
      name: package_config
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.9.1"
  package_resolver:
    dependency: transitive
    description:
      name: package_resolver
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.10"
  path:
    dependency: transitive
    description:
      name: path
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.6.4"
  pedantic:
    dependency: transitive
    description:
      name: pedantic
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.8.0+1"
  petitparser:
    dependency: transitive
    description:
      name: petitparser
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.4.0"
  plugin_platform_interface:
    dependency: transitive
    description:
      name: plugin_platform_interface
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.2"
  pool:
    dependency: transitive
    description:
      name: pool
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.4.0"
  provider:
    dependency: "direct main"
    description:
      name: provider
      url: "https://pub.dartlang.org"
    source: hosted
    version: "4.0.4"
  pub_semver:
    dependency: transitive
    description:
      name: pub_semver
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.4.3"
  pubspec_parse:
    dependency: transitive
    description:
      name: pubspec_parse
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.1.5"
  quiver:
    dependency: transitive
    description:
      name: quiver
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.0.5"
  shelf:
    dependency: transitive
    description:
      name: shelf
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.7.5"
  shelf_web_socket:
    dependency: transitive
    description:
      name: shelf_web_socket
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.2.3"
  sky_engine:
    dependency: transitive
    description: flutter
    source: sdk
    version: "0.0.99"
  source_gen:
    dependency: transitive
    description:
      name: source_gen
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.9.5"
  source_span:
    dependency: transitive
    description:
      name: source_span
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.5.5"
  sqflite:
    dependency: "direct main"
    description:
      name: sqflite
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.2.2+1"
  stack_trace:
    dependency: transitive
    description:
      name: stack_trace
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.9.3"
  stream_channel:
    dependency: transitive
    description:
      name: stream_channel
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.0.0"
  stream_transform:
    dependency: transitive
    description:
      name: stream_transform
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.2.0"
  string_scanner:
    dependency: transitive
    description:
      name: string_scanner
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.5"
  synchronized:
    dependency: transitive
    description:
      name: synchronized
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.2.0"
  term_glyph:
    dependency: transitive
    description:
      name: term_glyph
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.0"
  test_api:
    dependency: transitive
    description:
      name: test_api
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.2.11"
  timing:
    dependency: transitive
    description:
      name: timing
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.1.1+2"
  typed_data:
    dependency: transitive
    description:
      name: typed_data
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.6"
  url_launcher:
    dependency: "direct main"
    description:
      name: url_launcher
      url: "https://pub.dartlang.org"
    source: hosted
    version: "5.4.2"
  url_launcher_macos:
    dependency: transitive
    description:
      name: url_launcher_macos
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.0.1+4"
  url_launcher_platform_interface:
    dependency: transitive
    description:
      name: url_launcher_platform_interface
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.6"
  url_launcher_web:
    dependency: transitive
    description:
      name: url_launcher_web
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.1.1+1"
  vector_math:
    dependency: transitive
    description:
      name: vector_math
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.0.8"
  watcher:
    dependency: transitive
    description:
      name: watcher
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.9.7+14"
  web_socket_channel:
    dependency: transitive
    description:
      name: web_socket_channel
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.0"
  xml:
    dependency: transitive
    description:
      name: xml
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.5.0"
  yaml:
    dependency: transitive
    description:
      name: yaml
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.2.0"
sdks:
  dart: ">=2.7.0 <3.0.0"
  flutter: ">=1.12.13+hotfix.4 <2.0.0"

[amebrahimi]

Even now I have created a new project and Implemented the library but still not generating the *.g.dart class 😥

person.dart

import 'package:freezed_annotation/freezed_annotation.dart';

part 'person.freezed.dart';
part 'person.g.dart';

@freezed
abstract class Person with _$Person {
  factory Person({
    String name,
    int age,
  }) = _Person;

  factory Person.fromJson(Map<String, dynamic> json) => _$PersonFromJson(json);
}

person.freezed.dart

// GENERATED CODE - DO NOT MODIFY BY HAND
// ignore_for_file: deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named

part of 'person.dart';

// **************************************************************************
// FreezedGenerator
// **************************************************************************

Person _$PersonFromJson(Map<String, dynamic> json) {
  return _Person.fromJson(json);
}

mixin _$Person {
  String get name;
  int get age;

  Person copyWith({String name, int age});

  Map<String, dynamic> toJson();
}

class _$PersonTearOff {
  const _$PersonTearOff();

  _Person call({String name, int age}) {
    return _Person(
      name: name,
      age: age,
    );
  }
}

const $Person = _$PersonTearOff();

@JsonSerializable()
class _$_Person implements _Person {
  _$_Person({this.name, this.age});

  factory _$_Person.fromJson(Map<String, dynamic> json) =>
      _$_$_PersonFromJson(json);

  @override
  final String name;
  @override
  final int age;

  @override
  String toString() {
    return 'Person(name: $name, age: $age)';
  }

  @override
  bool operator ==(dynamic other) {
    return identical(this, other) ||
        (other is _Person &&
            (identical(other.name, name) ||
                const DeepCollectionEquality().equals(other.name, name)) &&
            (identical(other.age, age) ||
                const DeepCollectionEquality().equals(other.age, age)));
  }

  @override
  int get hashCode =>
      runtimeType.hashCode ^
      const DeepCollectionEquality().hash(name) ^
      const DeepCollectionEquality().hash(age);

  @override
  _$_Person copyWith({
    Object name = freezed,
    Object age = freezed,
  }) {
    return _$_Person(
      name: name == freezed ? this.name : name as String,
      age: age == freezed ? this.age : age as int,
    );
  }

  @override
  Map<String, dynamic> toJson() {
    return _$_$_PersonToJson(this);
  }
}

abstract class _Person implements Person {
  factory _Person({String name, int age}) = _$_Person;

  factory _Person.fromJson(Map<String, dynamic> json) = _$_Person.fromJson;

  @override
  String get name;
  @override
  int get age;

  @override
  _Person copyWith({String name, int age});
}

pubspec.yaml

name: f_test
description: A sample command-line application.
# version: 1.0.0
# homepage: https://www.example.com

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  freezed_annotation: ^0.7.1
#  path: ^1.6.0

dev_dependencies:
  pedantic: ^1.8.0
  test: ^1.6.0
  freezed: ^0.9.2
  build_runner:

pubspec.lock

# Generated by pub
# See https://dart.dev/tools/pub/glossary#lockfile
packages:
  _fe_analyzer_shared:
    dependency: transitive
    description:
      name: _fe_analyzer_shared
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.3"
  analyzer:
    dependency: transitive
    description:
      name: analyzer
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.39.4"
  args:
    dependency: transitive
    description:
      name: args
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.5.3"
  async:
    dependency: transitive
    description:
      name: async
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.4.0"
  boolean_selector:
    dependency: transitive
    description:
      name: boolean_selector
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.0.0"
  build:
    dependency: transitive
    description:
      name: build
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.2.2"
  build_config:
    dependency: transitive
    description:
      name: build_config
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.4.2"
  build_daemon:
    dependency: transitive
    description:
      name: build_daemon
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.1.3"
  build_resolvers:
    dependency: transitive
    description:
      name: build_resolvers
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.3.3"
  build_runner:
    dependency: "direct dev"
    description:
      name: build_runner
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.8.0"
  build_runner_core:
    dependency: transitive
    description:
      name: build_runner_core
      url: "https://pub.dartlang.org"
    source: hosted
    version: "4.5.2"
  built_collection:
    dependency: transitive
    description:
      name: built_collection
      url: "https://pub.dartlang.org"
    source: hosted
    version: "4.3.2"
  built_value:
    dependency: transitive
    description:
      name: built_value
      url: "https://pub.dartlang.org"
    source: hosted
    version: "7.0.9"
  charcode:
    dependency: transitive
    description:
      name: charcode
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.3"
  checked_yaml:
    dependency: transitive
    description:
      name: checked_yaml
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.2"
  code_builder:
    dependency: transitive
    description:
      name: code_builder
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.2.1"
  collection:
    dependency: transitive
    description:
      name: collection
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.14.12"
  convert:
    dependency: transitive
    description:
      name: convert
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.1.1"
  coverage:
    dependency: transitive
    description:
      name: coverage
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.13.9"
  crypto:
    dependency: transitive
    description:
      name: crypto
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.1.4"
  csslib:
    dependency: transitive
    description:
      name: csslib
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.16.1"
  dart_style:
    dependency: transitive
    description:
      name: dart_style
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.3.3"
  fixnum:
    dependency: transitive
    description:
      name: fixnum
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.10.11"
  freezed:
    dependency: "direct dev"
    description:
      name: freezed
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.9.2"
  freezed_annotation:
    dependency: "direct main"
    description:
      name: freezed_annotation
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.7.1"
  glob:
    dependency: transitive
    description:
      name: glob
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.2.0"
  graphs:
    dependency: transitive
    description:
      name: graphs
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.2.0"
  html:
    dependency: transitive
    description:
      name: html
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.14.0+3"
  http:
    dependency: transitive
    description:
      name: http
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.12.0+4"
  http_multi_server:
    dependency: transitive
    description:
      name: http_multi_server
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.2.0"
  http_parser:
    dependency: transitive
    description:
      name: http_parser
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.1.3"
  io:
    dependency: transitive
    description:
      name: io
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.3.3"
  js:
    dependency: transitive
    description:
      name: js
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.6.1+1"
  json_annotation:
    dependency: transitive
    description:
      name: json_annotation
      url: "https://pub.dartlang.org"
    source: hosted
    version: "3.0.1"
  logging:
    dependency: transitive
    description:
      name: logging
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.11.4"
  matcher:
    dependency: transitive
    description:
      name: matcher
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.12.6"
  meta:
    dependency: transitive
    description:
      name: meta
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.8"
  mime:
    dependency: transitive
    description:
      name: mime
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.9.6+3"
  multi_server_socket:
    dependency: transitive
    description:
      name: multi_server_socket
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.2"
  node_interop:
    dependency: transitive
    description:
      name: node_interop
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.3"
  node_io:
    dependency: transitive
    description:
      name: node_io
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.1+2"
  node_preamble:
    dependency: transitive
    description:
      name: node_preamble
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.4.8"
  package_config:
    dependency: transitive
    description:
      name: package_config
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.9.1"
  package_resolver:
    dependency: transitive
    description:
      name: package_resolver
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.10"
  path:
    dependency: transitive
    description:
      name: path
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.6.4"
  pedantic:
    dependency: "direct dev"
    description:
      name: pedantic
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.9.0"
  pool:
    dependency: transitive
    description:
      name: pool
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.4.0"
  pub_semver:
    dependency: transitive
    description:
      name: pub_semver
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.4.3"
  pubspec_parse:
    dependency: transitive
    description:
      name: pubspec_parse
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.1.5"
  quiver:
    dependency: transitive
    description:
      name: quiver
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.1.3"
  shelf:
    dependency: transitive
    description:
      name: shelf
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.7.5"
  shelf_packages_handler:
    dependency: transitive
    description:
      name: shelf_packages_handler
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.0.0"
  shelf_static:
    dependency: transitive
    description:
      name: shelf_static
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.2.8"
  shelf_web_socket:
    dependency: transitive
    description:
      name: shelf_web_socket
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.2.3"
  source_gen:
    dependency: transitive
    description:
      name: source_gen
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.9.5"
  source_map_stack_trace:
    dependency: transitive
    description:
      name: source_map_stack_trace
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.0.0"
  source_maps:
    dependency: transitive
    description:
      name: source_maps
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.10.9"
  source_span:
    dependency: transitive
    description:
      name: source_span
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.6.0"
  stack_trace:
    dependency: transitive
    description:
      name: stack_trace
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.9.3"
  stream_channel:
    dependency: transitive
    description:
      name: stream_channel
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.0.0"
  stream_transform:
    dependency: transitive
    description:
      name: stream_transform
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.2.0"
  string_scanner:
    dependency: transitive
    description:
      name: string_scanner
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.0.5"
  term_glyph:
    dependency: transitive
    description:
      name: term_glyph
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.0"
  test:
    dependency: "direct dev"
    description:
      name: test
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.14.2"
  test_api:
    dependency: transitive
    description:
      name: test_api
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.2.15"
  test_core:
    dependency: transitive
    description:
      name: test_core
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.3.3"
  timing:
    dependency: transitive
    description:
      name: timing
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.1.1+2"
  typed_data:
    dependency: transitive
    description:
      name: typed_data
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.6"
  vm_service:
    dependency: transitive
    description:
      name: vm_service
      url: "https://pub.dartlang.org"
    source: hosted
    version: "4.0.0"
  watcher:
    dependency: transitive
    description:
      name: watcher
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.9.7+14"
  web_socket_channel:
    dependency: transitive
    description:
      name: web_socket_channel
      url: "https://pub.dartlang.org"
    source: hosted
    version: "1.1.0"
  webkit_inspection_protocol:
    dependency: transitive
    description:
      name: webkit_inspection_protocol
      url: "https://pub.dartlang.org"
    source: hosted
    version: "0.5.0+1"
  yaml:
    dependency: transitive
    description:
      name: yaml
      url: "https://pub.dartlang.org"
    source: hosted
    version: "2.2.0"
sdks:
  dart: ">=2.7.0 <3.0.0"

And here is the console output when running flutter pub run build_runner watch

[INFO] Generating build script...
[INFO] Generating build script completed, took 310ms

[INFO] Setting up file watchers...
[INFO] Setting up file watchers completed, took 10ms

[INFO] Waiting for all file watchers to be ready...
[INFO] Waiting for all file watchers to be ready completed, took 11ms

[INFO] Initializing inputs
[INFO] Reading cached asset graph...
[INFO] Reading cached asset graph completed, took 49ms

[INFO] Checking for updates since last build...
[INFO] Checking for updates since last build completed, took 439ms

[INFO] Cleaning up outputs from previous builds....
[INFO] Cleaning up outputs from previous builds. completed, took 13ms

[INFO] Terminating. No further builds will be scheduled

[INFO] Builds finished. Safe to exit

[INFO] Generating build script...
[INFO] Generating build script completed, took 74ms

[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed, took 9.7s

[INFO] Setting up file watchers...
[INFO] Setting up file watchers completed, took 10ms

[INFO] Waiting for all file watchers to be ready...
[INFO] Waiting for all file watchers to be ready completed, took 11ms

[INFO] Initializing inputs
[INFO] Building new asset graph...

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 1ms

[INFO] Running build...
[INFO] 1.1s elapsed, 1/4 actions completed.
[INFO] Running build completed, took 2.1s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 33ms

[INFO] Succeeded after 2.2s with 1 outputs (4 actions)

[orestesgaolin]

@amebrahimi I did a thorough cleanup of the project and removed build.yaml etc.

After that I added build.yaml for json_serializable:

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: true
          create_to_json: true
          disallow_unrecognized_keys: false
          explicit_to_json: true

My pubspec looks like this:

name: app

version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter
  freezed_annotation: ^0.7.1
  json_serializable: ^3.2.5

dev_dependencies:
  flutter_driver:
    sdk: flutter
  flutter_test:
    sdk: flutter
  test: any
  build_runner:
  freezed:

And I run build_runner via:

flutter pub run build_runner build --delete-conflicting-outputs

All in all everything sorted out after several cleans etc. Check if there are any errors in verbose mode.

[amebrahimi]

I've added the json_serializable library to my pubspec.yaml and it worked, I think you should update your document and put this in that anyone wants to use the serializable part have to implement the json_serializable library. Thank you for you're response 😍🤗

[lukepighetti]

That fixed it for me. Docs don't make this clear.

[nyck33]

Someone told me to put json_serializable in dev dependencies along with Freezed that I am using. Which is correct or is it case by case?

[rrousselGit]

This is correct

[TDuffinNTU]

Just ran into this problem myself. Docs are still really bad for specifying this! Surely it should be mentioned alongside the first example of creating a freezed model. All you get is "add part 'model.g.dart and rebuild" without any other context until the bottom of the readme.

Just an informative "you need json_serialisable to use this feature" would be helpful!

[gwbischof]

This is still not working for me, even with the json_serializable dependency. No main.g.dart is generated after following the directions in the README

[LindenLiu]

This is still not working for me, even with the json_serializable dependency. No main.g.dart is generated after following the directions in the README

Finally I got mine work, which you have to put following to your original main.dart file. Otherwise the main.g.dart won't be generated.

part 'main.g.dart';