export declare type EventTypes = Record<string, Callback>;
export interface IEventEmitter<Events extends EventTypes, ChainedType = IEventEmitter<any, any>> {
    /**
     * Register an event handler for single invocation (subscribe)
     * @param eventType - The event type to listen to
     * @param onFunction - The function to call
     * @param that - (optional) The context with which to call onFunction (useful also for unsubscribing only a instance)
     */
    one<Event extends keyof Events>(eventType: Event, onFunction: Events[Event], that?: any): ChainedType extends IEventEmitter<any> ? this : ChainedType;
    /**
     * Register an event handler (subscribe)
     * @param eventType - The event type to listen to
     * @param onFunction - The function to call
     * @param that - (optional) The context with which to call onFunction (useful also for unsubscribing only a instance)
     */
    on<Event extends keyof Events>(eventType: Event, onFunction: Events[Event], that?: any): ChainedType extends IEventEmitter<any> ? this : ChainedType;
    /**
     * Stop listening to events (unsubscribe)
     * @param eventType - (optional) The event type to unsubscribe
     * @param onFunction - (optional) The function to call
     * @param that - (optional) The context with which to call onFunction (useful also for unsubscribing only a instance)
     */
    off<Event extends keyof Events>(eventType?: Event | null, onFunction?: Events[Event] | null, that?: any): ChainedType extends IEventEmitter<any> ? this : ChainedType;
    /**
     * Triggers an event
     * @param eventType - The event type to trigger
     * @param args - (optional) Arguments to pass to all listeners
     */
    trigger<Event extends keyof Events>(eventType: Event, ...args: Parameters<Events[Event]>): ChainedType extends IEventEmitter<any> ? this : ChainedType;
}
export interface Callback {
    (...args: any[]): void;
}
declare class MicroEmitter<Events extends EventTypes> implements IEventEmitter<Events> {
    private subscribers;
    private addSubscriber;
    one<Event extends keyof Events>(eventType: Event, onFunction: Events[Event], that?: any): this;
    on<Event extends keyof Events>(eventType: Event, onFunction: Events[Event], that?: any): this;
    off<Event extends keyof Events>(eventType?: Event | null, onFunction?: Events[Event] | null, that?: any): this;
    trigger<Event extends keyof Events>(eventType: Event, ...args: Parameters<Events[Event]>): this;
}
export default MicroEmitter;