import { Subscriber } from "../_core";
import { EventStream } from "../EventStream";
import { Activation, Root } from "./_base";
/**
 * Creates an EventStream that immediately ends
 *
 * @example
 *
 * const emptyNum = F.never<number>()
 *
 * @public
 */
export declare function never<ValueType>(): EventStream<ValueType>;
export declare class Never<T> extends Root<T> {
    constructor();
    protected create(subscriber: Subscriber<T>): Activation<T, Never<T>>;
}