/**
 * Overlays domain state, tracks which full-screen or floating overlays
 * are currently visible and their configuration.
 */
/** All known overlay identifiers in terminal host surfaces. */
export type OverlayId = 'help' | 'model_picker' | 'session_picker' | 'command_palette' | 'search' | 'permission_prompt' | 'confirmation' | 'settings' | 'agent_inspector' | 'task_monitor';
/** State of a single overlay instance. */
export interface OverlayInstance {
    /** Overlay identifier. */
    id: OverlayId;
    /** Whether the overlay is visible. */
    visible: boolean;
    /** Epoch ms when the overlay was opened. */
    openedAt: number;
    /** Optional opaque payload specific to each overlay type. */
    payload?: unknown | undefined;
    /** Z-order (higher = on top). */
    zIndex: number;
}
/**
 * OverlayDomainState, manages the overlay stack and focus.
 */
export interface OverlayDomainState {
    /** 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 registered overlay instances keyed by OverlayId. */
    overlays: Map<OverlayId, OverlayInstance>;
    /** Stack of currently visible overlay IDs in z-order (bottom → top). */
    visibleStack: OverlayId[];
    /** The overlay currently holding keyboard focus (undefined = none). */
    focusedOverlayId?: OverlayId | undefined;
    /**
     * Pending permission prompt context.
     * Populated when the 'permission_prompt' overlay is open.
     */
    pendingPermission?: {
        callId: string;
        toolName: string;
        category: string;
        args: Record<string, unknown>;
    } | undefined;
    /**
     * Pending confirmation dialog context.
     * Populated when the 'confirmation' overlay is open.
     */
    pendingConfirmation?: {
        message: string;
        detail?: string | undefined;
        confirmLabel: string;
        cancelLabel: string;
        resolveKey: string;
    } | undefined;
}
/**
 * Returns the default initial state for the overlays domain.
 */
export declare function createInitialOverlaysState(): OverlayDomainState;
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