import type { VoidFn } from "../ts/types.js";
export type Receiver<V> = (value: V) => unknown;
export type Emit<V> = (eventValue: V, onError: (err: unknown) => unknown) => Promise<unknown>;
export type AddReceiver<V> = (unloads: Set<VoidFn>, cb: Receiver<V>) => () => void;
export type AddEmitter<V> = (emitEvent: Emit<V>) => unknown;
/**
 * Create's a custom event emitter/receiver
 * @example
 * // Basic usage: get both onEvent and emitEvent
 * const [onUserEvent, emitUserEvent] = registerEmitter<User>();
 *
 * onUserEvent((event) => console.log(event));
 * emitUserEvent("Hello World", console.error);
 */
export declare function registerEmitter<V>(): [onEvent: AddReceiver<V>, emitEvent: Emit<V>];
/**
 * @example
 * // Define emitter during creation
 * const onUserEvent = registerEmitter((emitEvent) => {
 * 	emitEvent("Hello World", console.error);
 * });
 * onUserEvent(((event) => console.log(event))
 */
export declare function registerEmitter<V>(registerEmitter: AddEmitter<V>): AddReceiver<V>;
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