declare type ValueCallback<T> = (value: T) => void;
declare type CleanupCallback = () => void;
export declare function createSingletonHandler<T>(factory: (handler: ValueCallback<T>) => CleanupCallback): (listener: ValueCallback<T>) => void;
interface SingletonStateOptions<T> {
    factory: (handler: ValueCallback<T>) => CleanupCallback;
    initialState: T | (() => T);
}
export declare function createSingletonState<T>({ factory, initialState }: SingletonStateOptions<T>): () => T;
export {};
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