/**
 * Resolve the best-matching supported locale from a requested language tag
 * (or the browser's `navigator.language`). Ported from the byte-identical
 * `getLocale()` the three apps each carried; the supported-locale list and
 * default are injected so each app keeps ownership of its locale matrix.
 */
export interface LocaleOption {
    value: string;
    label?: string;
}
export interface GetLocaleOptions {
    supportedLocales: readonly LocaleOption[];
    defaultLocale: string;
}
export declare function matchSupportedLocale(lang: string | null | undefined, supportedLocales: readonly LocaleOption[]): string | undefined;
export declare function makeGetLocale(options: GetLocaleOptions): (lang?: string) => string;
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