import { AsyncPredicate, Predicate } from 'augmentative-iterable';
export interface CountFunction<T> {
    /**
     * Returns the number of elements that matches a predicate in the iterable. This is a resolving operation, will cause a full loop through all the elements of the iterable.<br>
     *   Examples:<br>
     *     * `fluent(['anchor', 'almond', 'bound', 'alpine']).count()` returns **4**<br>
     *     * `fluent(['anchor', 'almond', 'bound', 'alpine']).count(word => word[0] === 'a')` returns **3**
     * @param predicate The count will consider elements which match this predicate. Defaults to the always true function and thus, counts all the elements in the iterable if omitted.
     * @returns The number of elements matching the specified predicate.
     */
    (predicate?: Predicate<T>): number;
    /**
     * Returns the number of elements that matches a predicate in the iterable. This is a resolving operation, will cause a full loop through all the elements of the iterable.
     * @param predicate The count will consider elements which match this predicate. Defaults to the always true function and thus, counts all the elements in the iterable if omitted.
     * @returns The number of elements matching the specified predicate.
     */
    <R extends keyof T>(predicate: R): number;
}
export interface AsyncCountFunction<T> {
    /**
     * Returns the number of elements that matches an asynchronous predicate in the iterable. This is a resolving operation, will cause a full loop through all the elements of the iterable.
     * @param predicate The count will consider elements which match this asynchronous predicate.
     * @returns A promise of the number of elements matching the specified predicate.
     */
    (predicate?: AsyncPredicate<T>): Promise<number>;
    /**
     * Returns the number of elements that matches a predicate in the iterable. This is a resolving operation, will cause a full loop through all the elements of the iterable.
     * @param predicate The count will consider elements which match this predicate. Defaults to the always true function and thus, counts all the elements in the iterable if omitted.
     * @returns A promise of the number of elements matching the specified predicate.
     */
    <R extends keyof T>(predicate: R): Promise<number>;
}