/**
 * Coerces a locale-like string to the canonical locale value used by the runtime.
 *
 * @param {unknown} value
 * @returns {Locale | undefined}
 */
export function toLocale(value: unknown): Locale | undefined;
/**
 * Check if something is an available locale with the canonical project casing.
 *
 * @example
 *   if (isLocale(params.locale)) {
 *     setLocale(params.locale);
 *   } else {
 *     setLocale('en');
 *   }
 *
 * Use `toLocale()` when you want case-insensitive matching and canonicalization.
 *
 * @param {unknown} locale
 * @returns {locale is Locale}
 */
export function isLocale(locale: unknown): locale is Locale;
/**
 * Asserts that the input can be normalized to a locale.
 *
 * @param {unknown} input - The input to check.
 * @returns {Locale} The input normalized to a Locale.
 * @throws {Error} If the input is not a locale.
 */
export function assertIsLocale(input: unknown): Locale;
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