declare type EventMap = Record<string, unknown>;
declare type EventKey<T extends EventMap> = string & keyof T;
declare type EventReceiver<T> = (params: T) => void;
export interface Emitter<T extends EventMap> {
    on<K extends EventKey<T>>(eventName: K, fn: EventReceiver<T[K]>): void;
    off<K extends EventKey<T>>(eventName: K, fn: EventReceiver<T[K]>): void;
    emit<K extends EventKey<T>>(eventName: K, params: T[K]): void;
}
export declare class TypedEmitter<T extends EventMap> implements Emitter<T> {
    private readonly emitter;
    on<K extends EventKey<T>>(eventName: K, fn: EventReceiver<T[K]>): TypedEmitter<T>;
    off<K extends EventKey<T>>(eventName: K, fn: EventReceiver<T[K]>): TypedEmitter<T>;
    emit<K extends EventKey<T>>(eventName: K, params: T[K]): boolean;
}
export {};