import { EventStream } from "../EventStream";
import { Property } from "../Property";
/**
 * Creates a constant Property with the given value.
 *
 * @param val - Property's value
 *
 * @example
 *
 * const message = F.constant("Tsers!")
 *
 * @public
 */
export declare function constant<ValueType>(val: ValueType): Property<ValueType>;
/**
 * Creates a single-event EventStream with the given value. Stream
 * ends immediately after the value has been emitted.
 *
 * @param val - Stream's value
 *
 * @example
 *
 * const message = F.once("Tsers!")
 *
 * @public
 */
export declare function once<ValueType>(val: ValueType): EventStream<ValueType>;