/**
* ISO 3166-1 alpha-2 shape: exactly two ASCII letters, case-insensitive.
* Shared by `flag.ts` (validating `country`) and `languageToCountry` below
* (validating a language tag's region subtag), because both values end up
* passed to the peer package `@aceshooting/lyra-flags`' `flagUrl()`, which
* naively interpolates its `code` argument into a `new URL('./flags/${code}.svg',
* ...)` with no validation of its own -- an unvalidated value containing `../`
* segments can escape the intended flags/ directory. Anything that doesn't
* match this shape is treated the same as an unknown/missing flag.
*/
export declare const ALPHA2_RE:RegExp;
/** ISO 3166-1 alpha-3 shape: exactly three ASCII letters, case-insensitive. Length alone
*  disambiguates the two code spaces, so no explicit format hint is needed. */
export declare const ALPHA3_RE:RegExp;
/**
* The alpha-2 code for an ISO 3166-1 alpha-3 code, or `undefined` when it isn't one. Case
* insensitive. Deliberately excludes user-assigned and withdrawn codes: a historical or defunct
* state has no current flag to resolve, so it takes the component's unresolved path rather than
* silently mapping to a successor state's flag.
*/
export declare function alpha3ToAlpha2(code:string):string|undefined;
/**
* Default mapping from a language subtag to a representative country flag
* (ISO 3166-1 alpha-2). Languages don't map 1:1 to countries; these are the
* conventional choices for language pickers. Override per-app as needed.
*/
export declare const LANGUAGE_TO_COUNTRY:Record<string,string>;
/**
* Resolve a BCP-47-ish language tag to a flag country code.
* A region subtag wins (`en-US` → `us`); otherwise the base language is mapped. The region subtag
* isn't always in the second position -- a script subtag (e.g. `zh-Hant-TW`, ISO 15924, always 4
* letters) can sit between the base language and the region, so every subtag after the base is
* scanned for the first 2-letter alpha match rather than assuming it's always `parts[1]`. Base
* language fallback accepts only the lookup table's own entries, never inherited object members.
*/
export declare function languageToCountry(language:string):string|undefined;
/**
* The endonym of a BCP-47 language tag — the locale's name written in that locale itself
* (`'fr'` → `français`, `'pt-BR'` → `português (Brasil)`), which is what a language switcher should
* list so a reader who understands none of the current UI language can still find their own.
*
* Derived from `Intl.DisplayNames`, so no name table ships with the library and the result follows
* the browser's own ICU data; the instance comes from the shared memoized cache, since a picker
* renders one lookup per offered locale on every render pass. A tag with no display name resolves
* to the tag itself, and so does a structurally invalid one — `Intl.DisplayNames` throws a
* `RangeError` on those rather than falling back, and a language picker should degrade to showing
* the raw tag rather than tearing down the render.
*
* Pair it with {@link languageToCountry} for the flag half of the same row.
*/
export declare function localeNativeName(tag:string):string;