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# Code Generation (build_runner)
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> **PENTING:** `build_runner` di proyek ini **tidak bisa** dijalankan dengan Flutter 3.47 / Dart 3.13.
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> Gunakan SDK Flutter 3.41.9 (Dart 3.11.5) lewat FVM. Aplikasinya sendiri tetap di-`run`/`build`
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> dengan Flutter versi global (3.47).
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---
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## TL;DR
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PowerShell (Windows):
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```powershell
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$FVM = "$env:USERPROFILE\fvm\versions\3.41.9\bin"
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& "$FVM\flutter.bat" pub get # 1. resolve paket dgn Dart 3.11.5
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& "$FVM\dart.bat" run build_runner build --delete-conflicting-outputs # 2. generate
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flutter pub get # 3. balik ke SDK global 3.47
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```
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Git Bash:
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```bash
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FVM=~/fvm/versions/3.41.9/bin
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"$FVM/flutter.bat" pub get
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"$FVM/dart.bat" run build_runner build --delete-conflicting-outputs
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flutter pub get
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```
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Durasi normal: **±90–120 detik** untuk full build (146 output).
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Setelah itu jalankan `flutter analyze` untuk memastikan hasil generate bersih.
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---
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## Kenapa harus SDK terpisah?
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Kalau codegen dijalankan dengan Flutter global (3.47 / Dart 3.13), semua builder gagal dengan:
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```
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W SDK language version 3.13.0 is newer than `analyzer` language version 3.9.0.
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E freezed on lib/application/.../category_analytic_loader_bloc.dart:
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Exception: Missing implementation of visitDotShorthandPropertyAccess
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```
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Rantai penyebabnya:
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1. `freezed 2.5.8` membatasi `analyzer <8.0.0`, jadi pub me-resolve ke **analyzer 7.7.1** (language version 3.9).
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2. Dart 3.13 memakai sintaks *dot-shorthand* (`.value`) di sumber SDK/framework.
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3. Analyzer 7.7.1 bisa mem-*parse*-nya tapi belum bisa menuliskannya ke summary → crash saat resolve.
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4. Semua generator (`freezed`, `json_serializable`, `injectable_generator`, `auto_route_generator`) berbagi analyzer yang sama, jadi semuanya ikut mati — termasuk saat men-generate file lama yang tidak diubah.
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Dart 3.11.5 (Flutter 3.41.9) adalah versi tertinggi yang **masih cocok dengan analyzer 7.7.1** sekaligus memenuhi batas `pubspec.lock` (`dart >=3.11.0-0`).
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---
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## Setup sekali di mesin baru
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```powershell
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dart pub global activate fvm
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```
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Tambahkan folder binari pub ke PATH agar perintah `fvm` dikenali:
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`%LOCALAPPDATA%\Pub\Cache\bin`
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Lalu unduh SDK-nya (±1 GB, sekali saja):
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```powershell
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fvm install 3.41.9
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fvm list # verifikasi
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```
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SDK tersimpan di `%USERPROFILE%\fvm\versions\3.41.9` dan **tidak** mengubah Flutter global.
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> Kita sengaja **tidak** menjalankan `fvm use`, supaya repo tidak punya `.fvmrc`/`.fvm/`
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> dan IDE tetap memakai Flutter 3.47 untuk menjalankan aplikasi.
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> Kalau lebih suka pin per-project, jalankan `fvm use 3.41.9` lalu pakai `fvm dart run build_runner ...`,
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> dan tambahkan `.fvm/` ke `.gitignore`.
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---
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## Perintah harian
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Semua contoh memakai variabel `$FVM` dari bagian TL;DR.
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```powershell
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# build sekali (paling sering dipakai)
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& "$FVM\dart.bat" run build_runner build --delete-conflicting-outputs
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# mode watch saat banyak mengubah anotasi
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& "$FVM\dart.bat" run build_runner watch --delete-conflicting-outputs
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# hanya membersihkan output generated
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& "$FVM\dart.bat" run build_runner clean
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```
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Wajib generate ulang setiap kali mengubah/menambah file dengan anotasi:
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| Anotasi | Generator | Output |
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| --- | --- | --- |
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| `@freezed` | freezed | `*.freezed.dart` |
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| `@JsonSerializable` / `fromJson` di DTO | json_serializable | `*.g.dart` |
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| `@injectable`, `@LazySingleton` | injectable_generator | `lib/injection.config.dart` |
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| `@RoutePage()` | auto_route_generator | `lib/presentation/router/app_router.gr.dart` |
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| asset baru di `assets/` | flutter_gen_runner | `lib/presentation/components/assets/assets.gen.dart` |
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### Localization (i18n) — tidak lewat build_runner
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`flutter gen-l10n` memakai tooling Flutter, bukan analyzer, jadi **aman dijalankan dengan Flutter 3.47**:
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```powershell
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flutter gen-l10n
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```
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Jalankan setiap kali `lib/l10n/app_id.arb` / `app_en.arb` berubah. Hasilnya: `lib/l10n/app_localizations*.dart`.
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---
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## Aturan penting soal `--delete-conflicting-outputs`
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Flag ini **menghapus dulu** semua file generated (±55 file `*.freezed.dart` / `*.g.dart`) sebelum membuat ulang.
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Kalau proses dibatalkan di tengah jalan, project akan penuh error karena file-nya sudah hilang.
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Pemulihan (semua file generated ikut ter-commit di git):
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```bash
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git status --porcelain | grep -E "^ D" | sed 's/^ D //' | while read -r f; do git checkout -- "$f"; done
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```
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Tips: jangan pipe output build ke `tail`/`head` — outputnya jadi ter-buffer sampai proses selesai,
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sehingga terlihat seperti *hang* padahal sedang jalan.
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---
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## Troubleshooting
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| Gejala | Penyebab | Solusi |
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| --- | --- | --- |
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| `Missing implementation of visitDotShorthandPropertyAccess` | codegen dijalankan dengan Flutter global 3.47 | pakai SDK FVM 3.41.9 |
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| `Failed to update packages` + dump stack VM | `flutter pub run build_runner` / `fvm spawn ... pub run` | pakai `dart.bat run build_runner`, jangan `flutter pub run` |
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| Ratusan error “isn't defined” di IDE, file `*.freezed.dart` hilang | build dibatalkan setelah `--delete-conflicting-outputs` | restore lewat `git checkout` (lihat di atas) |
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| `pub get` gagal / versi paket bergeser | `pubspec.lock` di-resolve oleh SDK berbeda | jalankan `flutter pub get` dengan SDK global setelah codegen selesai |
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| Build terasa lama di run pertama | asset graph baru dibuat dari nol | wajar, ±90–120 detik; run berikutnya inkremental |
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---
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## Rencana jangka panjang
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Perbaikan permanen = upgrade toolchain codegen supaya jalan native di Dart 3.13:
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- `freezed` 2.5.8 → 3.x, `freezed_annotation` 2.4.x → 3.x
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- `injectable` 2.x → 3.x, `injectable_generator` 2.7 → 3.x
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- `auto_route` 9.x → 11.x, `auto_route_generator` 9.x → 10.x
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- `build_runner` → 2.16.x, `json_serializable` → 6.14.x (analyzer ikut naik ke 13.x)
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Konsekuensinya breaking dan cukup besar, jadi perlu dijadwalkan sendiri:
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- freezed 3 **menghapus** `.map()` / `.when()` / `.maybeWhen()` / `.maybeMap()` → ±49 pemakaian (mayoritas di handler event BLoC) harus diganti pattern matching Dart 3 (`switch`).
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- ±98 file dengan `@freezed` harus dideklarasikan `abstract class` atau `sealed class`.
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- Migrasi konfigurasi router (auto_route 11) dan DI (injectable 3).
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Selama migrasi itu belum dikerjakan, gunakan alur FVM di dokumen ini.
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