/**
 * Panels domain state, tracks the panel-first operator UX surfaces:
 * which panels are open, their layout, and focus state.
 */
/** All known panel identifiers in the TUI. */
export type PanelId = 'main_conversation' | 'agent_monitor' | 'task_list' | 'tool_trace' | 'diff_viewer' | 'file_explorer' | 'git_status' | 'mcp_inspector' | 'plugin_manager' | 'telemetry_dashboard' | 'session_list';
/** Layout position within a split-pane TUI layout. */
export type PanelPosition = 'primary' | 'secondary' | 'sidebar' | 'footer';
/** State of a single panel. */
export interface PanelState {
    /** Panel identifier. */
    id: PanelId;
    /** Whether the panel is currently open/visible. */
    open: boolean;
    /** Layout position assignment. */
    position: PanelPosition;
    /** Relative size weight within its position slot (1–100). */
    sizeWeight: number;
    /** Whether the panel currently has input focus. */
    focused: boolean;
    /** Epoch ms when the panel was last activated. */
    lastActivatedAt?: number | undefined;
    /**
     * Scroll offset in lines (for scrollable panels).
     */
    scrollOffset: number;
    /** Whether the panel content is collapsed. */
    collapsed: boolean;
}
/**
 * PanelDomainState, panel layout and focus management.
 */
export interface PanelDomainState {
    /** Monotonic revision counter; increments on every mutation. */
    revision: number;
    /** Timestamp of last mutation (Date.now()). */
    lastUpdatedAt: number;
    /** Subsystem that triggered the last mutation. */
    source: string;
    /** All panels keyed by PanelId. */
    panels: Map<PanelId, PanelState>;
    /** The panel currently holding keyboard focus. */
    focusedPanelId: PanelId;
    /** Previously focused panel (for focus restoration). */
    previousFocusedPanelId?: PanelId | undefined;
    /** Whether the sidebar is visible. */
    sidebarVisible: boolean;
    /** Whether the footer panel row is visible. */
    footerVisible: boolean;
    /** Current terminal width in columns. */
    terminalColumns: number;
    /** Current terminal height in rows. */
    terminalRows: number;
}
/**
 * Returns the default initial state for the panels domain.
 */
export declare function createInitialPanelsState(): PanelDomainState;
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