import { BehaviorSubject } from 'rxjs';
/**
 * A type that represents a value that can be updated over time:
 *
 * 1) It can be a static value of type `TValue`
 * 2) Or a `BehaviorSubject` that emits values of type `TValue`
 * 3) Or pair of `[getValue, setValue]` functions for getting and setting the value
 */
export type Updatable<TValue> = TValue | BehaviorSubject<TValue> | [TValue, (value: TValue) => void];
/**
 * Restricts an Updatable to a (2) BehaviorSubject variant
 *
 * @see Updatable
 *
 * @private internal utility <- TODO: [🧠] Maybe export from `@promptbook/types`
 */
export declare function asUpdatableSubject<TValue>(value: Updatable<TValue>): BehaviorSubject<TValue>;