/**
* Shared memoized `Intl` formatter factories. Constructing an
* `Intl.NumberFormat` / `Intl.DateTimeFormat` / `Intl.DisplayNames` / `Intl.ListFormat` /
* `Intl.RelativeTimeFormat` / `Intl.PluralRules` / `Intl.Collator` / `Intl.Segmenter` performs an ICU locale-data
* lookup that is orders of magnitude slower than reusing an existing
* instance, and per-row template loops (table cells, chart points, feed
* entries) would otherwise pay that cost once per row on every render pass.
* One instance per locale + options pair is shared across all components on
* the page.
*
* Each kind keeps at most {@link MAX_ENTRIES_PER_KIND} entries, evicting the
* least recently used beyond that, so pages that churn through many locales
* or option shapes cannot grow the caches without bound.
*/
/**
* Converts an author-supplied locale into the canonical, structurally valid tag used at every
* `Intl` boundary. Message lookup deliberately does not use this function: synthetic catalog
* keys such as `x-test` must remain addressable even though ECMA-402 formatters reject them.
*
* Browsers and translation tools sometimes produce underscore tags (`en_US`) or the sentinel
* `auto`; arbitrary `lang`/`locale` attributes can also be malformed. Underscores are normalized
* before validation, while an empty, sentinel, synthetic, or malformed tag falls back to English
* instead of turning an ordinary component render into a `RangeError`.
*/
export declare function resolveIntlLocale(locale:string|undefined):string;
/**
* A shared `Intl.NumberFormat` for the given locale and options. `undefined` and malformed input
* safely select the library's deterministic English fallback.
*/
export declare function getNumberFormat(locale:string|undefined,options?:Intl.NumberFormatOptions):Intl.NumberFormat;
/** A shared `Intl.DateTimeFormat` for the given locale and options. */
export declare function getDateTimeFormat(locale:string|undefined,options?:Intl.DateTimeFormatOptions):Intl.DateTimeFormat;
/**
* A shared `Intl.DisplayNames` for the given locale and options. Note the
* `Intl.DisplayNames` constructor itself requires `options.type`, so omitting
* the options throws the same `TypeError` a direct construction would.
*/
export declare function getDisplayNames(locale:string,options?:Intl.DisplayNamesOptions):Intl.DisplayNames;
/** A shared `Intl.ListFormat` for the given locale and options. */
export declare function getListFormat(locale:string|undefined,options?:Intl.ListFormatOptions):Intl.ListFormat;
/** A shared `Intl.RelativeTimeFormat` for the given locale and options. */
export declare function getRelativeTimeFormat(locale:string|undefined,options?:Intl.RelativeTimeFormatOptions):Intl.RelativeTimeFormat;
/** A shared `Intl.PluralRules` instance for the given locale and options. */
export declare function getPluralRules(locale:string|undefined,options?:Intl.PluralRulesOptions):Intl.PluralRules;
/** A shared `Intl.Collator` instance for the given locale and options. */
export declare function getCollator(locale:string|undefined,options?:Intl.CollatorOptions):Intl.Collator;
/** A shared `Intl.Segmenter` instance for the given locale and options. */
export declare function getSegmenter(locale:string|undefined,options?:Intl.SegmenterOptions):Intl.Segmenter;