Carlos Florêncio
15 lines
682 B
TypeScript
15 lines
682 B
TypeScript
import type { RenderItem } from "@/hooks/use-processed-messages";
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import { TASK_DESCRIPTION_SYNTHETIC_ID } from "@/hooks/use-processed-messages";
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/** Stable descriptor for the oldest visible row; turn ids survive group extension. */
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export function getOldestVisibleBoundaryKey(items: RenderItem[]): string | null {
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const item = items.find(
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(candidate) =>
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candidate.type === "turn_group" ||
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(candidate.type === "message" && candidate.message.id !== TASK_DESCRIPTION_SYNTHETIC_ID),
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);
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if (!item) return null;
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if (item.type === "turn_group") return `turn:${item.turnId ?? item.id}`;
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return item.type === "message" ? `message:${item.message.id}` : item.id;
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}
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