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feat: add LocalePicker component - #49
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Region picker for settings pages: a searchable, keyboard-accessible dropdown over ISO 3166-1 regions plus a summary card of the locale defaults that follow from the selection — currency, date format, number format, and first day of week — all derived through Intl. The value is a full BCP 47 tag whose region subtag is the picked region; picking a region swaps only that subtag, so the language survives (en-IN -> en-US, fr-JP -> fr-DE). Week info comes from Intl.Locale#getWeekInfo() where available, with a regional fallback table; the currency row uses an ISO 4217 table keyed by region and shows an em dash rather than a guess where none exists. Follows the component conventions: useControllableState, forwarded ref with rest passthrough, shared Locale type from ./types, and useListboxNavigation for the popup keyboard semantics.
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📝 Walkthrough
Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 7 files. (2 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly and concisely identifies the main change: adding the LocalePicker component. Linked Issues check Issue #33requirements are covered. The PR adds and exportsLocalePickerwith controlled and uncontrolled state, forwarded refs, rest-prop passthrough, and the sharedLocaletype. It provides regi…Out of Scope Changes check The reported changes stay within Issue #33. Component implementation, tests, registry metadata, documentation, demo data, and package dependencies support the LocalePicker objective. The merge repair …Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Full details: Linked Issues check
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Explanation
Issue
#33requirements are covered. The PR adds and exportsLocalePickerwith controlled and uncontrolled state, forwarded refs, rest-prop passthrough, and the sharedLocaletype. It provides region selection,Intl-derived currency, date, number, and week-start values, search, keyboard access, RTL support, dark-mode-compatible tokens, tests, registry integration, documentation, and a live demo. The supplied evidence also covers the required fallback data and package validation.
Full details: Out of Scope Changes check
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Explanation
The reported changes stay within Issue
#33. Component implementation, tests, registry metadata, documentation, demo data, and package dependencies support the LocalePicker objective. The merge repair removes staleLocaleNumberandRelativeTimeentries, restoresTranslationWidgetClassNames, and removes a deleted documentation entry; these changes repair affected repository integration and do not add unrelated feature scope. The focused diff reads were unavailable, but the current PR description and whole-PR summary provide this scope evidence.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 7 files. (2 skipped: 2 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Review comments at @src/registry/components/locale-picker.tsx:
- Line 38: Update the BG currency mapping in the locale currency configuration
from BGN to EUR so locales ending in -BG use the euro.
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📒 Files selected for processing: 9
content/docs/components/index.mdxcontent/docs/components/locale-pickers/locale-picker.mdxcontent/docs/components/locale-pickers/meta.jsoncontent/docs/components/meta.jsonsrc/components/docs/locale-picker-demo.tsxsrc/registry/components/index.tssrc/registry/components/locale-picker.tsxsrc/registry/registry.tstest/locale-picker.test.tsx
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| BA: "BAM", | ||
| BD: "BDT", | ||
| BE: "EUR", | ||
| BG: "BGN", |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
Map Bulgaria to EUR.
Bulgaria adopted the euro on 1 January 2026. Line 38 still maps BG to BGN. For any *-BG locale, the summary card therefore shows a currency that is no longer in use. The test in test/locale-picker.test.tsx does not detect this. Intl.DisplayNames still has a name for BGN, so the check passes.
Proposed fix
--- "a/src/registry/components/locale-picker.tsx"
+++ "b/src/registry/components/locale-picker.tsx"
@@ -35,7 +35,7 @@
BA: "BAM",
BD: "BDT",
BE: "EUR",
- BG: "BGN",
+ BG: "EUR",
BH: "BHD",
BR: "BRL",
BY: "BYN",📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| BG: "BGN", | |
| BG: "EUR", |
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Review comment at @src/registry/components/locale-picker.tsx at line 38:
Update the BG currency mapping in the locale currency configuration from BGN to
EUR so locales ending in -BG use the euro.
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Bulgaria adopted the euro on 1 January 2026, so the region's currency is EUR, not BGN. The ISO 4217 validity test passes for both codes — it cannot catch a valid-but-obsolete currency — so pin BG: "EUR" in the table expectation instead.
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Inline comments:
Review comments at @src/registry/components/locale-picker.tsx:
- Line 372: Update the locale option’s search text to include upper, label, and
english, but omit code so a shared language subtag does not match every option.
- Around line 135-154: Complete the REGION_FIRST_DAY fallback table for the
mapped selectable regions by adding the missing CLDR region entries, including
ID with Sunday as the first day; change SA to Sunday as well. Do not add AE,
which uses Monday.
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src/registry/components/locale-picker.tsxtest/locale-picker.test.tsx
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Complete the REGION_FIRST_DAY fallback to mirror current CLDR for every currency-mapped region whose week does not start on Monday (40 entries): add the 27 missing regions (incl. ID and MV, which starts Friday), change SA to Sunday, and drop IQ, IR, LY, SD, SY and YE, which current CLDR reports as Monday-starting and which would contradict getWeekInfo on modern engines. AE is correctly absent (Monday). Omit the BCP 47 tag from an option's search text: every option shares the active language subtag, so typing it used to match every region. The region part of the tag is already the option's region code. Pin the fallback table to the runtime's week info with a source-reading test that compares it against getWeekInfo for all currency regions, and add a search regression test for the shared language subtag. Align the docs Usage section, the preview demo, and the PR snippet: imports block plus a bare component block, no state or wrapper.
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@ujwalbajaj thanks for this — the CLDR work and the Styling
Motion
Customisation
Registry and docs
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Inline comments:
Review comments at @src/registry/components/index.ts:
- Line 27: Remove the LocaleNumber and corresponding RelativeTime exports from
the registry index and remove their registry entries until the source modules
exist, preventing TS2307 missing-module errors. Preserve all existing registry
entries for available components.
- Line 25: Restore the public TranslationWidgetClassNames type export in the
components barrel alongside TranslationWidgetProps, re-exporting it from its
existing source or a compatible replacement if the source type changed. Preserve
the existing import path for consumers.
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content/docs/components/meta.jsonsrc/registry/components/index.tssrc/registry/registry.ts
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Inline comments:
Review comments at @src/registry/components/locale-picker.tsx:
- Line 563: Update the trigger button’s onClick handler to clear the search
query via setSearch("") whenever the popup is currently open, then toggle open
as before; preserve the existing behavior when opening the popup.
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content/docs/components/locale-pickers/locale-picker.mdxcontent/docs/components/meta.jsonsrc/components/docs/locale-picker-demo.tsxsrc/lib/elements-config.tssrc/registry/components/index.tssrc/registry/components/locale-picker.tsxsrc/registry/registry.tstest/locale-picker.test.tsxtest/menu-reopen.test.tsx
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Reuses the shared helpers and listbox hook correctly; checks pass locally. Changes needed:
- Screenshots in the PR description: light/dark, LTR/RTL, open popup, summary card.
- Docs import a site-only module (
content/docs/components/locale-pickers/locale-picker.mdx:93):regionscomes from@/lib/elements-config, which users don't have. Inline the array in the example. - Memoize derived data (
src/registry/components/locale-picker.tsx:469-486,:511): options are rebuilt on every render (each search keystroke), creating twoIntl.DisplayNamesper region plus the summary formatters.useMemoon[regions, active, labelMode]with oneDisplayNamesper mode. showSummaryprop (:703): the summary card always renders; hiding it currently requiresclassNames.summary="hidden". AddshowSummary(defaulttrue).- Hard-coded English strings (
:578,:620,:636,:654,:711-734): "Current region:", "Search regions", "Select region", "Clear search" and the summary labels. Add alabels?: Partial<LocalePickerLabels>prop following the pattern in #81 (exported type, per-key defaults, docs row, test).
Nits:
6. Dedupe regions (:661 uses region as the key, so repeats produce duplicate keys).
7. The search input's aria-label (:620) ignores a custom searchPlaceholder; fold into the labels change.
8. The week-start test (test/locale-picker.test.tsx:445) depends on the runtime's CLDR data; note the assumption in a comment so an ICU update failure is easy to trace.
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Labels, showSummary, memoization, dedupe and the docs fix look good. One item left:
CI fails: test/locale-picker.test.tsx:649 ("marks the exiting popup aria-hidden until it is removed"), reproducible on every run. Closing from the trigger unmounts the popup immediately instead of running the exit animation. LanguageSwitcher, with the same AnimatePresence / MenuPanel setup, keeps the panel mounted (aria-hidden) until the exit finishes. Find what removes the panel early in LocalePicker rather than adjusting the test, then update the branch with main.
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Correction to my last review: the exit animation isn't broken. The "marks the exiting popup aria-hidden until it is removed" test (test/locale-picker.test.tsx:642) only fails when it's the first test in the file to run a real animation — rendering LanguageSwitcher or LocalePicker once before it makes it pass. It fails locally every run and passed in CI on 98792b6, so it depends on the machine.
Please make it order-independent, e.g. open and close the picker once before the assertion, or wait for aria-hidden with waitFor. Everything else from the review is addressed.
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The aria-hidden test is now order-independent and passes alone and in the full suite. Typecheck, lint, tests and build pass. Approved.
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Merged, thanks @ujwalbajaj. |
Description
LocalePicker is a region picker for settings pages and onboarding flows. Pick a region and it shows the locale defaults that come with it — currency, date format, number format, and first day of week — all resolved live through
Intl(DisplayNames,NumberFormat,DateTimeFormat,getWeekInfo()), with a single ISO 4217 fallback table for the currency code.The selected value is a full BCP 47 tag whose region subtag is the picked region: picking Germany from
en-INyieldsen-DE, so the user's language always survives the swap.What's in the box
Intl-derived currency, date, number, and week-start previews) with a fixed sample date and amount so server and client markup are byte-identicalgetFlaghelper, native or English names (label), RTL-awarevariant/sizetriggers,align/sidepopup positioning with automatic viewport flipclassNames(LocalePickerClassNames), translatable UI text (labels→LocalePickerLabels)motionpopup animation honouringprefers-reduced-motion; the closing panel leaves the accessibility tree immediately...restpassthrough — same conventions asLanguageSwitcherCloses #33
Type of change
Screenshots / Recording
Checklist
npm run lintpassesnpm run typecheckpassesnpm run testpassesnpm run buildpassesUsage
Self-contained — this is exactly the snippet the docs page renders and documents.
Verification
CI (lint, format:check, typecheck, test, build, build:lib, test:pack): https://github.com/babelize/babelize-elements/actions/workflows/ci.yml?query=branch%3Afeat%2Flocale-picker
304 tests pass across the suite; 53 cover this component — render, controlled + uncontrolled, keyboard suite incl. IME safety, RTL, SSR determinism, appearance/positioning incl. the real viewport flip, popup props, closing motion, translated labels,
showSummary, region dedupe, and source-reading validity tests over the currency and first-day tables (the first-day table is pinned to the runtime'sgetWeekInfo, so CLDR drift fails CI).Registry:
/r/locale-picker.jsonserves the source with all four registry dependencies (clsx,tailwind-merge,lucide-react,motion) resolved to absolute URLs;test:registrygreen.npm path: packed tarball installed into a bare project outside the repo,
LocalePickerimported and SSR-rendered from it —"use client"preserved, no@/specifier leaks (test:packgreen in CI)./docs/components/locale-pickers/locale-pickerprerenders innext build;build:liband both tsconfigs green.Summary card values (sample amount
1234567.89, sample date2026-01-15), computed from the sameIntlcalls the component makes:INR ₹12,34,567.8915 Jan 202612,34,567.89USD $1,234,567.89Jan 15, 20261,234,567.89GBP £1,234,567.8915 Jan 20261,234,567.89EUR €1,234,567.8915 Jan 20261.234.567,89JPY ¥1,234,568Jan 15, 20261,234,567.89Notes
getFlaginlocale-data— a bare region likeINis also a legacy language code, so the region subtag of the option tag is always used.Intl.Locale#getWeekInfo()(or theweekInfogetter) where available, with a CLDR-pinned regional fallback table for older engines.role="combobox"search field witharia-activedescendant,aria-expanded,aria-haspopup,aria-selected; arrows, Home/End, Enter, Escape; IME-safe.labels(searchPlaceholder,searchLabel,clearSearch,emptyMessage,listbox,currentas a(name) => stringtemplate, plus the four summary row labels);searchPlaceholderandemptyMessageprops still win overlabels.clsx,tailwind-merge,lucide-react,motion(peer: react ≥18, react-dom ≥18, tailwindcss ≥3).bun(the pinned package manager).test:packcannot execute on Windows (spawnSync npm ENOENT); the equivalent was run manually as noted under Verification.