/**
 * Hook for managing local state with debounced persistence.
 *
 * Provides immediate local state updates for responsive UI while
 * debouncing expensive persistence operations (e.g., store updates, API calls).
 *
 * @param externalValue - Value from external source (store, props, etc.)
 * @param onPersist - Callback to persist value (will be debounced)
 * @param debounceMs - Debounce delay in milliseconds (default: 300)
 *
 * @returns [localValue, setValue] - Current local value and setter function
 *
 * @example
 * ```tsx
 * const [localSpec, setSpec] = useDebouncedValue(
 *   cell.data.vegaSpec,
 *   (spec) => updateCell(id, draft => { draft.data.vegaSpec = spec }),
 *   300
 * );
 * ```
 */
export declare function useDebouncedValue<T>(externalValue: T, onPersist: (value: T) => void, debounceMs?: number): [T, (value: T) => void];
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