/// <reference types="react" />
export interface ChatMessagesState {
    /** Whether the reader is at the live edge (scrolled to the bottom). */
    atBottom: boolean;
    /**
     * Ids of the registered messages currently intersecting the viewport, in
     * document order. Only messages given a `messageId` are tracked.
     */
    visibleMessageIds: string[];
}
export interface ChatMessagesActions {
    /** Scrolls the conversation to the live edge. */
    scrollToBottom: (behavior?: ScrollBehavior) => void;
    /** Scrolls the message registered with the given `messageId` into view. */
    scrollToMessage: (id: string, options?: {
        behavior?: ScrollBehavior;
    }) => void;
}
export interface ChatMessageRegistration {
    id?: string;
    scrollAnchor?: boolean;
}
export interface ChatMessagesRegistry {
    register: (element: HTMLElement, registration: ChatMessageRegistration) => () => void;
}
export declare const ChatMessagesStateContext: import("react").Context<ChatMessagesState | null>;
export declare const ChatMessagesActionsContext: import("react").Context<ChatMessagesActions | null>;
export declare const ChatMessagesRegistryContext: import("react").Context<ChatMessagesRegistry | null>;
export declare function useChatMessagesState(part: string): ChatMessagesState;
export declare function useChatMessagesActions(part: string): ChatMessagesActions;
export interface UseChatMessagesReturn extends ChatMessagesState, ChatMessagesActions {
}
/**
 * Scroll state and commands for the enclosing `Chat.Messages`: `atBottom`,
 * `visibleMessageIds`, `scrollToBottom` and `scrollToMessage`.
 */
export declare function useChatMessages(): UseChatMessagesReturn;
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