/**
 * One component's value, controlled by its parent or held by the component itself: the
 * mode is latched at mount (a `controlled` value then means controlled), the change
 * callback fires in both modes, and a controlled value cleared to undefined keeps the
 * last one the parent gave. Returns the value to render and the setter a press calls.
 */
export declare function useControllableState<T>(
/** The controlled value; undefined means "uncontrolled". */
controlled: T | undefined, 
/** Initial value for uncontrolled use. */
defaultValue: T, 
/** Change callback, fired in BOTH modes. */
onChange?: (next: T) => void): [T, (next: T) => void];
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