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Fix Taiwan resolving to CN-TW in the Atlas country search (#1049)

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natural-earth gives Taiwan ISO_A2='CN-TW' (a subdivision-style value) with ADM0_A3='TWN'. The dynamic A2_TO_A3 augmentation added 'CN-TW'->'TWN', which then overwrote the legitimate TWN->TW entry in the reverse map, so Taiwan's country option resolved to 'CN-TW' — unresolvable by Intl.DisplayNames (no name, broken flag, not searchable). Only augment A2_TO_A3 with real 2-letter codes.
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Maurice
2026-05-31 21:54:16 +02:00
parent 5bf8dd8cef
commit c565f22bf2
1 changed files with 4 additions and 1 deletions
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client/src/pages/atlas/useAtlas.ts
+4 -1
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@@ -141,7 +141,10 @@ export function useAtlas() {
for (const f of geo.features) {
const a2 = f.properties?.ISO_A2
const a3 = f.properties?.ADM0_A3 || f.properties?.ISO_A3
if (a2 && a3 && a2 !== '-99' && a3 !== '-99' && !A2_TO_A3[a2]) {
// Only real 2-letter ISO codes: natural-earth uses subdivision-style
// values like "CN-TW" for Taiwan, which would otherwise overwrite the
// legitimate TWN->TW reverse mapping and break the country (#1049).
if (a2 && a3 && a2.length === 2 && a2 !== '-99' && a3 !== '-99' && !A2_TO_A3[a2]) {
A2_TO_A3[a2] = a3
}
}