我无法让构建运行程序生成任何内容

Question

我的包中有一个名为 temp 的 build.yaml

builders:
  my_package:
    import: "package: my_package/my_package.dart"
    builder_factories: ["myBuilder"]
    build_extensions: {'.dart': ['.g.dart']}
    auto_apply: none
    build_to: source

我确认 my_package 已正确导入到 pubspec.yaml 中。然后我将这个构建器放在包 my_package 中，并将其导出。该文件位于 my_package 中的 lib/my_package.dart

library my_package;

import 'package:build/build.dart';

Builder myBuilder(BuilderOptions options) {
  return SimpleBuilder();
}

class SimpleBuilder extends Builder {
  SimpleBuilder();

  @override
  Map<String, List<String>> get buildExtensions => {
        '.dart': ['.g.dart']
      };

  @override
  Future<void> build(BuildStep buildStep) async {
    log.info('SimpleBuilder: Processing ${buildStep.inputId.path}');

    final outputId = buildStep.inputId.changeExtension('.g.dart');
    final content = 'Generated content for ${buildStep.inputId.path}';

    log.info('SimpleBuilder: Writing to ${outputId.path}');

    await buildStep.writeAsString(outputId, content);
  }
}

在包含 build.yaml 的包 temp 中，我有一个 dart 文件

lib/filename.dart

我跑步

dart run build_runner build --verbose

我希望文件出现在

lib/filename.g.dart

但是什么也没发生，为什么？它输出这个

dart run build_runner build --verbose
Resolving dependencies in `/my_drive/temp`... 
Downloading packages... 
Got dependencies in `/my_drive/temp`.
Building package executable... 
Built build_runner:build_runner.
[INFO] Entrypoint:Generating build script...
[INFO] Entrypoint:Generating build script completed, took 157ms

[INFO] Bootstrap:Precompiling build script......
[INFO] Bootstrap:Precompiling build script... completed, took 2.0s

[FINE] Bootstrap:Core package locations file does not exist
[INFO] BuildDefinition:Initializing inputs
[INFO] BuildDefinition:Building new asset graph...
[INFO] BuildDefinition:Building new asset graph completed, took 513ms

[INFO] BuildDefinition:Checking for unexpected pre-existing outputs....
[INFO] BuildDefinition:Checking for unexpected pre-existing outputs. completed, took 0ms

[INFO] Build:Running build...
[INFO] Build:Running build completed, took 3ms

[INFO] Build:Caching finalized dependency graph...
[INFO] Build:Caching finalized dependency graph completed, took 34ms

[INFO] Build:Succeeded after 41ms with 0 outputs (0 actions)

我做错了什么？日志也没有显示。

当我更改导入或构建工厂时，当我构建包或构建工厂不存在时，它确实会抛出错误，这使我相信导入和构建工厂已正确配置。

Answer 1

配置构建器的文件

build.yaml

位于包含构建器源代码的包的根目录中。您必须将

build.yaml

移动到

my_package

的根目录。通常将构建器导出到位于

builder.dart

的名为

lib

的文件中。 然后

build.yaml

变成：

builders:
  my_builder:
    import: "package:my_package/builder.dart"
    builder_factories: ["myBuilder"]
    build_extensions: {'.dart': ['.g.dart']}
    auto_apply: none
    build_to: source

通过这些更改，包

temp

的构建将按预期进行。例如，文件

filename.g.dart

的内容为：

Generated content for lib/filename.dart

您的包中可以有一个可选的

build.yaml

文件

temp

，这一事实可能会引起一些混乱。例如：

targets:
  $default:
    builders:
      # Configure the builder `pkg_name|builder_name`
      my_package|my_builder:
        enabled: true
        # generate_for:
        #   - lib/*.dart
        # options:
        

您可以在此处启用/禁用或配置构建器。请注意，我将您的构建器命名为：

my_builder

，并且使用语法访问它：

my_package|my_builder

。