import type { RenderBlock } from './message-blocks';
import type { UiComponent } from './split-blocks';
export declare const GROUPED_SURFACE_TYPES: Set<string>;
export type UiRenderBlock = {
    kind: 'ui';
    component: UiComponent;
};
export type MdRenderBlock = {
    kind: 'md';
    content: string;
};
export type PendingRenderBlock = {
    kind: 'pending-ui';
    id: string;
    componentType: string;
};
export type BlockSegment = {
    type: 'surface-group';
    surfaceType: string;
    items: UiRenderBlock[];
    startIndex: number;
} | {
    type: 'pending-ui';
    block: PendingRenderBlock;
    index: number;
}
/** A markdown block whose content is only whitespace — kept, because Core renders it. */
 | {
    type: 'blank-bridge';
    block: MdRenderBlock;
    index: number;
} | {
    type: 'md';
    block: MdRenderBlock;
    index: number;
} | {
    type: 'ui';
    block: UiRenderBlock;
    index: number;
};
export declare function groupBlocks(list: readonly RenderBlock[] | undefined): BlockSegment[];