export type GetSingleOrThrowErrorReason = 'found-more-than-one' | 'found-zero';
export type GetSingleOrThrowErrorFactory = (reason: GetSingleOrThrowErrorReason) => Error;
/**
 * @short
 * *Get* the only *single* value from iterable; *throw* if unexpected size.
 *
 * @categories
 * static
 *
 * @description
 * If the iterable's length is 1, its only yielded value is returned.
 * Otherwise, an Error is thrown.
 *
 * To throw custom errors, use the optional parameter.
 *
 * @returns
 * T
 *
 * @example
 * j.GetSingleOrThrow([21])
 * // => 21
 *
 * @example
 * j.GetSingleOrThrow([])
 * // => throws
 *
 * @example
 * j.GetSingleOrThrow([1, 2, 3])
 * // => throws
 */
export declare function GetSingleOrThrow<T>(iterable: Iterable<T>, errorFactory?: GetSingleOrThrowErrorFactory): T;