Logging: add a breadcrumb on locale switch - #212
Merged
Baskarayelu merged 1 commit intoAug 28, 2026
Merged
Baskarayelu merged 1 commit into
Baskarayelu merged 1 commit into
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This app has no locale-switching UI yet (t() takes locale as an explicit parameter with no client-side preference state), so there was nowhere to log a locale switch. Add lib/i18n/localePreference.ts (getStoredLocale/setLocalePreference) as the underlying preference-persistence piece a future switcher UI can call: setLocalePreference logs a structured breadcrumb (event: "locale_switched", from/to locale codes, no free-form message) whenever the persisted locale actually changes.
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Note on scope
This app has no locale-switching UI yet -- `t(key, locale)` takes the locale as an explicit parameter with no client-side preference state or persistence anywhere. Rather than skip the issue, I added the underlying preference-persistence piece a future locale switcher would call, with the breadcrumb wired into it, so it's ready to use as soon as that UI lands.
Change
`lib/i18n/localePreference.ts`:
Tests
`lib/i18n/localePreference.test.ts`: returns `null` with nothing stored, ignores an invalid stored value, persists a new locale, logs the structured breadcrumb (asserting on the parsed JSON console output, matching `useAlerts.test.ts`'s style), and doesn't log when unchanged.
`npx vitest run lib/i18n/localePreference.test.ts`: 5 passed. `npx tsc --noEmit` / `npx eslint` on changed files: clean.
Related to #104