Files
iptvnator/.changes/web-lazy-date-locales.md
T
4grayandClaude Fable 5.1 512e9787a8 perf(web): load Angular date locales lazily per language (#1695)
Plan thread C1, journey **J1 `launch`**, counter **`renderer.initialBytes`**. Stacked on #1694 → #1693 → #1692; merge in order.

`apps/web/src/app/app-date-locales.ts` imported the locale data of all 18 supported languages eagerly, so every user shipped and parsed all of it at startup. Each locale is now a dynamic import keyed by the Angular locale id that `normalizeDateLocale()` derives from the app language (`by` → `be`, `ary` → `ar-MA`, `zhtw` → `zh-Hant`); English needs no data.

Ordering is preserved so no template renders a locale whose data has not arrived (Angular throws in that case):
- `main.ts` awaits the initial language's data (from `getInitialLanguage()`) before `bootstrapApplication`.
- Both `TranslateService.use()` call sites, `AppComponent.initSettings()` and `SettingsFormFacade.applySavedSettings()`, register the data first through the new `AppDateLocaleService`.
- A failed load never leaves the locale without data: English formatting is registered under the requested id (eager 1.1 KB `@angular/common/locales/en`), so `DatePipe` renders instead of throwing; the locale is not marked registered, so the next call retries and a success replaces the fallback (review follow-up).
- `AppDateLocaleService.use()` orders switches by request, not by completion: a switch whose data arrives after a newer request is dropped, so the language chosen last wins (review follow-up).

No kill switch: behavior is identical once the locale resolves, and the only new failure mode (a same-origin chunk failing to load) is shared with every lazy route.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
2026-09-26 13:44:29 +02:00

249 B

type, area
type area
perf web

The app now loads date and time formatting data only for the language you use instead of shipping all 18 languages in the startup bundle, so it has less to download and parse on every launch; English needs none at all.