/** Viewport-space geometry of the composer at the moment a session is created. */
export interface ComposerRect {
    top: number;
    left: number;
    width: number;
    height: number;
}
type HandoffConsumer = 'composer' | 'thread';
interface SessionHandoff {
    sessionId: string;
    rect: ComposerRect;
    createdAt: number;
    claimedAt: Partial<Record<HandoffConsumer, number>>;
}
interface SessionTransitionState {
    handoff: SessionHandoff | null;
    startHandoff: (sessionId: string, rect: ComposerRect) => void;
    /**
     * Returns the captured composer rect while the handoff is still fresh and the
     * consumer has not already run past its re-claim window.
     */
    claimHandoff: (sessionId: string, consumer: HandoffConsumer) => ComposerRect | null;
    clearHandoff: () => void;
}
export declare const useSessionTransitionStore: import("zustand").UseBoundStore<import("zustand").StoreApi<SessionTransitionState>>;
/** Captures the composer geometry that a session handoff animates from. */
export declare function captureComposerRect(element: HTMLElement | null | undefined): ComposerRect | null;
export {};
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