declare type ValueHandler<T> = (value: T) => void;
declare type ValueHandlerObj<T> = {
    next: ValueHandler<T>;
};
declare type Observer<T> = ValueHandler<T> | ValueHandlerObj<T>;
declare type Opts<Value> = {
    onSubscribe?: () => void;
    onUnsubscribe?: () => void;
    getValue?: () => Value;
};
export default function createObservable<Value>(initialValue: Value, opts?: Opts<Value>): {
    [x: string]: Value | ((nextValue: any) => void);
    readonly value: Value;
    subscribe(observer: Observer<Value>): {
        unsubscribe: () => void;
    };
    next(nextValue: any): void;
};
export { createObservable };