export type ConversationStreamKey = string | number;
export type ConversationStreamItemKey<T> = string | ((item: T, index: number) => ConversationStreamKey);
/**
 * The loader owns the data: it prepends older items into the `items` prop
 * itself before resolving, and only reports whether more history exists.
 * Returning items here would make the component a second source of truth.
 */
export interface ConversationStreamLoadResult {
    hasMore: boolean;
}
export interface ConversationStreamProps<T> {
    items: T[];
    itemKey: ConversationStreamItemKey<T>;
    /** Height assumed for unmeasured items; measurements correct it. */
    estimatedItemHeight?: number;
    /** Extra items rendered on both sides of the visible range. */
    overscan?: number;
    /** Called near the top; consumer prepends into `items`, then resolves. */
    loadOlder?: () => Promise<ConversationStreamLoadResult>;
    /** Whether history may exist before the first `loadOlder` answers. */
    hasMoreInitial?: boolean;
    /** Drives the scroll-to-bottom pill's "new content" state. */
    streaming?: boolean;
}