/**
 * A BCP 47 tag that `Intl` accepts for a UI language. Hosts may report
 * `it_IT` or `it_IT.UTF-8`, which `Intl` rejects with a RangeError; such a
 * tag is read as its BCP 47 form. One that is still unusable falls back to
 * `fallback` (the active UI language, say), then English, rather than
 * breaking the render.
 */
export declare function canonicalLocale(language: string, fallback?: string): string;
/**
 * The tag to hand `Intl.NumberFormat` for a UI language. It is the
 * language itself unless the engine has no number data for it and the kit
 * knows a donor with the same pattern. Every other tag passes through
 * unchanged, so the caller keeps its own error handling.
 */
export declare function numberLocale(language: string): string;
/** The kit's formatting tag: base English is British and base Portuguese
 * European, matching the date-fns locales the kit loads. */
export declare function formatLocale(language: string): string;
//# sourceMappingURL=intl-locale.d.ts.map