import { Observable as IObservable, OnNext, Unsubscribe } from './types';
export declare class Observable<T> implements IObservable<T> {
    private subscribers;
    private currentValue;
    constructor(initialValue?: T);
    get value(): T;
    set value(value: T);
    first(): Promise<T>;
    subscribe(onNext: OnNext<T>): Unsubscribe;
    unsubscribe(onNext: OnNext<T>): void;
}
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