in lib/h3core.js [1734:1743]
export function vertexToLatLng(h3Index) {
const latlng = C._malloc(SZ_LATLNG);
const [lower, upper] = h3IndexToSplitLong(h3Index);
try {
throwIfError(H3.vertexToLatLng(lower, upper, latlng));
return readLatLng(latlng);
} finally {
C._free(latlng);
}
}