import { Subject, Subscription } from 'rxjs';
/**
 * Use in components with the `@Output` directive to emit custom events
 * synchronously or asynchronously, and register handlers for those events
 * by subscribing to an instance.
 */
export declare class EventEmitter<T extends any> extends Subject<T> {
    async: boolean;
    constructor(async?: boolean);
    /**
   * Emits an event containing a given value.
   * @param value The value to emit.
   */
    emit(value?: T): void;
    /**
     * Registers handlers for events emitted by this instance.
     * @param generatorOrNext When supplied, a custom handler for emitted events.
     * @param error When supplied, a custom handler for an error notification
     * from this emitter.
     * @param complete When supplied, a custom handler for a completion
     * notification from this emitter.
     */
    subscribe(generatorOrNext?: any, error?: any, complete?: any): Subscription;
    static ρAnn(): any;
}