import { IWorkspacePaneData } from '../models';
import { IUndoState, IUndoObject } from './useUndo';
/**
 * Merges saved session/project data with default values.
 * @param saved - Saved session/project data (will be null/undefined if not present).
 * @param defaultValue - Default value to use as base.
 * @returns Merged data combining default and saved values.
 * @internal
 */
export declare function mergeData<T>(saved: unknown, defaultValue: T): T;
/**
 * Calculate the maximum number of active intervals allowed based on workspace panes.
 * @param numPanes - Number of active workspace panes
 * @returns Maximum allowed active intervals
 * @internal
 */
export declare function calculateMaxActiveProjectDataIntervals(numPanes: number): number;
/**
 * A hook for data that should be saved to the current project.
 * @param id - The unique id of the view.
 * @param slice - The slice name for the project data.
 * @param defaultValue - The default value or a function that returns the default value.
 * @param loadedCallback - Optional callback invoked once after data is loaded.
 * @returns An object with a flag indicating if the project data has been initialized, the current project data and a setter callback.
 */
export declare const useProjectDataSlice: <T>(id: number, slice: string, defaultValue: T | (() => T), loadedCallback?: (value: T) => void) => [T, React.Dispatch<React.SetStateAction<T>>, boolean];
/**
 * A hook for data that should be saved to the current project.
 * @param id - The unique id of the view.
 * @param defaultValue - The default value or a function that returns the default value.
 * @returns An object with a flag indicating if the project data has been initialized, the current project data and a setter callback.
 */
export declare const useProjectData: <T>(id: number, defaultValue: T | (() => T)) => {
    projectDataIsInitialized: boolean;
    projectData: T;
    setProjectData: React.Dispatch<React.SetStateAction<T>>;
};
/**
 * Calculate the maximum number of active intervals allowed based on workspace panes.
 * @param numPanes - Number of active workspace panes
 * @returns Maximum allowed active intervals
 * @internal
 */
export declare function calculateMaxActiveSessionDataIntervals(numPanes: number): number;
/**
 * A hook for data that should be saved to the session data.
 * @param id - The unique id of the view.
 * @param defaultValue - The default value or a function that returns the default value.
 * @param loadedCallback - Optional callback invoked once after data is loaded.
 * @returns An object with the current session data, a setter, and an initialization flag.
 */
export declare const useSessionData: <T>(id: number, defaultValue: T | (() => T), loadedCallback?: (value: T) => void) => {
    sessionDataIsInitialized: boolean;
    sessionData: T;
    setSessionData: React.Dispatch<React.SetStateAction<T>>;
};
/**
 * A hook for persistent (session) data tied to a specific view slice.
 * @param id - The unique id of the view.
 * @param slice - The slice name for the session data.
 * @param defaultValue - The default value or a function that returns the default value.
 * @param loadedCallback - Optional callback invoked once after data is loaded.
 * @returns [state, setState, loaded]  the current data, setter, and loaded flag.
 */
export declare function useSessionDataSlice<T>(id: number, slice: string, defaultValue: T | (() => T), loadedCallback?: (value: T) => void): [T, React.Dispatch<React.SetStateAction<T>>, boolean];
/**
 * Custom hook to manage undo/redo state using session data storage.
 * @param id - The unique id of the view.
 * @param slice - The slice name for the session data.
 * @param initialState - The initial undo state.
 * @returns [undoObject, loaded] - An undo object for managing state history and loaded flag.
 */
export declare function useUndoSessionDataSlice<T>(id: number, slice: string, initialState?: IUndoState<T>): [IUndoObject<T>, boolean];
/**
 * Hook to get/set a workspace pane by id.
 */
export declare const useWorkspacePaneWithId: (id: number) => IWorkspacePaneData | null;
/**
 * Callback type for when the view goes online.
 * @param isNewView - Whether the view is newly created.
 * @param isMounting - Whether the view is mounting.
 * @param onlineCounter - The number of times CanKing has gone online.
 */
export type OnGoingOnlineCallback = (isNewView: boolean, isMounting: boolean, onlineCounter: number) => void;
/**
 * Callback type for when the view goes offline.
 * @param isNewView - Whether the view is newly created.
 * @param isMounting - Whether the view is mounting.
 * @param onlineCounter - The number of times CanKing has gone online.
 */
export type OnGoingOfflineCallback = (isNewView: boolean, isMounting: boolean, onlineCounter: number) => void;
/**
 * Custom hook to synchronize session state with online/offline status changes.
 * @param parentIsInitialized - Whether the parent component is initialized.
 * @param id - The unique id of the view.
 * @param onGoingOnline - Callback function to handle going online.
 * @param onGoingOffline - Callback function to handle going offline.
 * @returns The current online status.
 */
export declare function useOnlineStatusSync(parentIsInitialized: boolean, id: number, onGoingOnline: OnGoingOnlineCallback, onGoingOffline: OnGoingOfflineCallback): boolean;