import type { MessagePart } from '../../types/api';
import { type AssistantRenderItem } from './assistantTurnModel';
import { type PartPresentationContext } from './partVisibility';
export interface TurnWorkContext extends PartPresentationContext {
    /**
     * Action-tool call ids that already have a persisted result. Their
     * ephemeral placeholder is not real work.
     */
    completedActionToolCallIds: ReadonlySet<string>;
}
/**
 * True for a part that is agent work (tools, reasoning) rather than the
 * turn's closing answer. Status/todo/finish parts are excluded because they
 * already have another home in the UI.
 */
export declare function isCollapsibleWorkPart(part: MessagePart, context: TurnWorkContext): boolean;
/** Index of the first part that belongs to the closing answer (or `parts.length`). */
export declare function getTrailingAnswerStartIndex(parts: readonly MessagePart[], context: TurnWorkContext): number;
export declare function hasCollapsibleWork(parts: readonly MessagePart[], context: TurnWorkContext): boolean;
/**
 * When an older turn is collapsed, hide work plus any commentary that came
 * before the closing answer. Images, files, and errors stay visible.
 */
export declare function shouldHidePartWhenWorkCollapsed(part: MessagePart, index: number, answerStart: number, context: TurnWorkContext): boolean;
export declare function isWorkRenderItem(item: AssistantRenderItem, context: TurnWorkContext): boolean;
/** Index of the first render item that belongs to the closing answer. */
export declare function getTrailingAnswerRenderStart(items: readonly AssistantRenderItem[], context: TurnWorkContext): number;
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