Ilia Denisov
90f0424de2
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The UI language follows the device (the local choice / system guess) and is deliberately not overridden from the account, but the advertising banner and out-of-app push routing are resolved server-side from preferred_language. A saved device choice the account had not recorded — picked while a guest, or differing from the Telegram system-language seed — left the banner (and pushes) in the wrong language until a Settings change rewrote preferred_language. On profile load (adoptSession and the in-place link path) push the saved local choice to the account when it differs (new pure helper languageNeedsServerSync; no-op for guests and when already equal), so the banner and pushes match the visible UI from the first open. Unit-tested.
23 lines
1.3 KiB
TypeScript
23 lines
1.3 KiB
TypeScript
// Interface-language reconciliation. Kept out of app.svelte.ts (a runes module that the
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// node-env Vitest layer cannot import) so the decision is unit-testable.
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import type { Locale } from './i18n/catalog';
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import type { Profile } from './model';
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/**
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* languageNeedsServerSync reports whether the durable account's `preferred_language` should be
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* rewritten to the chosen interface `locale`. It is true only for a real (non-guest) account
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* whose stored language differs from the locale; guests keep only the client-side preference,
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* and an already-matching account is a no-op.
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*
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* The UI language follows the device (the local choice / system guess), but the advertising
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* banner and out-of-app push routing are resolved server-side from `preferred_language`. A saved
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* device choice the account has not yet recorded — picked while a guest, or differing from the
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* Telegram system-language seed — would otherwise leave the banner and pushes in the wrong
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* language until the next Settings change. Both the Settings control and the on-load reconciler
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* gate their write on this.
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*/
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export function languageNeedsServerSync(profile: Profile | null | undefined, locale: Locale): boolean {
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return !!profile && !profile.isGuest && profile.preferredLanguage !== locale;
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}
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