flutter build_runner 耗時太長

Question

我正在使用EasyLocalization 、 mobx 、 JsonSerializable等。要生成*.g.dart文件，我使用build_runner watch或scripts/build.sh中的腳本：

flutter packages pub run build_runner build

最多需要2 秒，但突然間開始需要至少10 秒，有時甚至是30 秒。 由於這種情況， build_runner watch變得無用，我的意思是從那以后它就不能正常工作了。

運行腳本時控制台上的 output ：

$ sh scripts/build.sh 
[INFO] Generating build script...
[INFO] Generating build script completed, took 611ms

[INFO] Initializing inputs
[INFO] Reading cached asset graph...
[INFO] Reading cached asset graph completed, took 126ms

[INFO] Checking for updates since last build...
[INFO] Checking for updates since last build completed, took 745ms

[INFO] Running build...
[INFO] 1.2s elapsed, 0/16 actions completed.
[INFO] 2.2s elapsed, 0/16 actions completed.
[INFO] 3.3s elapsed, 0/16 actions completed.
[INFO] 12.5s elapsed, 1/17 actions completed.
[INFO] 13.6s elapsed, 4/20 actions completed.
[INFO] Running build completed, took 14.6s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 57ms

[INFO] Succeeded after 14.6s with 2 outputs (47 actions)

Answer 1

我終於決定自己嘗試解決這個問題，我通過在我的 pubspec.yaml 中添加以下內容來稍微改進它：例如

targets:
  $default:
    builders:
      json_serializable:
        enabled: true
        generate_for:
          include:
            - lib/your_codegen_folder/**.dart
            - lib/**.gen.dart

希望這可以為您加快速度。 您必須為其他兩個生成器添加構建器配置，例如此處的 json_serializable 生成器。 我懷疑他們可能被稱為easy_localization和mobx ？ 我不知道，我是新手。

Answer 2

除了避免在不必要的輸入上運行構建器之外，我還設法通過禁用我沒有使用的 mockito 模擬生成器來加快構建速度：

targets:
  $default:
    builders:
      your_builder:
        generate_for:
          - lib/**/*.dart
      mockito:mockBuilder:
        enabled: false

運行構建導致 Mockito 在我的每個測試文件中搜索@GenerateMocks。