export interface Emitter<T> extends AsyncIterable<T> {
    emit(value: T): void;
    throw(error: any): void;
    return(): void;
}
export interface EmitterOptions {
    onReturn?: () => void;
    onThrow?: (error: any) => void;
}
export declare function createEmitter<T>({ onReturn, onThrow }?: EmitterOptions): Emitter<T>;