/**
 * @short
 * *Count* items which satisfy a condition.
 *
 * @categories
 * static trigger
 *
 * @since
 * 0.0.2
 *
 * @description
 * Returns the number of yielded items from the given iterable which
 * satisfy the given condition.
 *
 * When no condition is given, all items are accounted for, and the
 * function behaves exactly like {@link Size}.
 *
 * @parameter
 * iterable
 * Iterable
 * The iterable we're counting in.
 *
 * @parameter
 * predicate
 * (t: T, i: number) => boolean
 * The function applied to each yielded item, used to determine whether
 * the item will be counted or not.
 *
 * @returns
 * number
 *
 * @example
 * j.Count([1, 2, 3])
 * // => 3
 *
 * @example
 * j.Count([])
 * // => 0
 *
 * @example
 * j.Count([1, 2, 3, 4], a => a % 2 == 0)
 * // => 2
 *
 * @example
 * j.Count(j.Integers())
 * // (!) infinite loop
 */
export declare function Count<T>(iterable: Iterable<T>, predicate?: (item: T, index: number) => boolean): number;