import type { IStream } from '../types.js';
/**
 * Combine latest values from multiple streams whenever any stream emits.
 * Waits until every input has produced at least one value before the first
 * output; subsequent inputs trigger a new combined emission.
 *
 * streamA:    -1---2|
 * streamB:    ---a---b-c->
 * combineMap: ---A-B-C-D->
 *   where A = [1, a]
 *         B = [2, a]
 *         C = [2, b]
 *         D = [2, c]
 */
export declare function combineMap<T extends readonly unknown[], R>(f: (...args: T) => R, ...sources: [...{
    [K in keyof T]: IStream<T[K]>;
}]): IStream<R>;
/**
 * Combine multiple streams into an object stream keyed by the input map.
 *
 * temperature: -a-b-c->
 * humidity:    -x-y-z->
 * combine:     -A-B-C->
 *   where A = { temperature: a, humidity: x }
 *         B = { temperature: b, humidity: x }
 *         C = { temperature: b, humidity: y }
 */
export declare function combine<A>(state: {
    [P in keyof A]: IStream<A[P]>;
}): IStream<Readonly<A>>;