export interface ObservableBox<T> {
    /** The current value. Reactive. */
    readonly value: T;
    /**
     * Changes the current value.
     *
     * Note that this function is only present during development to facilitate hot reloading.
     */
    setValue?(newValue: T): void;
}
/**
 * Returns a boxed value.
 * In development node, the box value can be changed and observed.
 */
export declare function createBox<T>(value: T): ObservableBox<T>;
/** @internal */
export declare function isBox<T>(value: T | ObservableBox<T>): value is ObservableBox<T>;
/** @internal */
export declare function unwrapBox<T>(value: T | ObservableBox<T>): T;