/**
 * @module NanoEmitter  
 * This module contains the NanoEmitter class, which is a tiny event emitter powered by [nanoevents](https://www.npmjs.com/package/nanoevents) - [see the documentation for more info](https://github.com/Sv443-Network/UserUtils/blob/main/docs.md#nanoemitter)  
 */
import { type DefaultEvents, type Emitter, type EventsMap, type Unsubscribe } from "nanoevents";
export interface NanoEmitterOptions {
    /** If set to true, allows emitting events through the public method emit() */
    publicEmit: boolean;
}
/**
 * Class that can be extended or instantiated by itself to create a lightweight event emitter with helper methods and a strongly typed event map.  
 * If extended from, you can use `this.events.emit()` to emit events, even if the `emit()` method doesn't work because `publicEmit` is not set to true in the constructor.  
 */
export declare class NanoEmitter<TEvtMap extends EventsMap = DefaultEvents> {
    protected readonly events: Emitter<TEvtMap>;
    protected eventUnsubscribes: Unsubscribe[];
    protected emitterOptions: NanoEmitterOptions;
    /** Creates a new instance of NanoEmitter - a lightweight event emitter with helper methods and a strongly typed event map */
    constructor(options?: Partial<NanoEmitterOptions>);
    /**
     * Subscribes to an event and calls the callback when it's emitted.  
     * @param event The event to subscribe to. Use `as "_"` in case your event names aren't thoroughly typed (like when using a template literal, e.g. \`event-${val}\` as "_")  
     * @returns Returns a function that can be called to unsubscribe the event listener  
     * @example ```ts  
     * const emitter = new NanoEmitter<{  
     *   foo: (bar: string) => void;  
     * }>({  
     *   publicEmit: true,  
     * });  
     *  
     * let i = 0;  
     * const unsub = emitter.on("foo", (bar) => {  
     *   // unsubscribe after 10 events:  
     *   if(++i === 10) unsub();  
     *   console.log(bar);  
     * });  
     *  
     * emitter.emit("foo", "bar");  
     * ```  
     */
    on<TKey extends keyof TEvtMap>(event: TKey | "_", cb: TEvtMap[TKey]): () => void;
    /**
     * Subscribes to an event and calls the callback or resolves the Promise only once when it's emitted.  
     * @param event The event to subscribe to. Use `as "_"` in case your event names aren't thoroughly typed (like when using a template literal, e.g. \`event-${val}\` as "_")  
     * @param cb The callback to call when the event is emitted - if provided or not, the returned Promise will resolve with the event arguments  
     * @returns Returns a Promise that resolves with the event arguments when the event is emitted  
     * @example ```ts  
     * const emitter = new NanoEmitter<{  
     *   foo: (bar: string) => void;  
     * }>();  
     *  
     * // Promise syntax:  
     * const [bar] = await emitter.once("foo");  
     * console.log(bar);  
     *  
     * // Callback syntax:  
     * emitter.once("foo", (bar) => console.log(bar));  
     * ```  
     */
    once<TKey extends keyof TEvtMap>(event: TKey | "_", cb?: TEvtMap[TKey]): Promise<Parameters<TEvtMap[TKey]>>;
    /**
     * Emits an event on this instance.  
     * ⚠️ Needs `publicEmit` to be set to true in the NanoEmitter constructor or super() call!  
     * @param event The event to emit  
     * @param args The arguments to pass to the event listeners  
     * @returns Returns true if `publicEmit` is true and the event was emitted successfully  
     */
    emit<TKey extends keyof TEvtMap>(event: TKey, ...args: Parameters<TEvtMap[TKey]>): boolean;
    /** Unsubscribes all event listeners from this instance */
    unsubscribeAll(): void;
}