Conversation State Predicates (utils/conversation-predicates.ts)

Pure TypeScript functions evaluating conversation state, pinning, and unread counts. Reuse for chat UI gating and message filtering logic.

// Source: https://github.com/vellum-ai/vellum-assistant | License: MIT | Copyright 2025 Vellum AI
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * Pure predicates over the `Conversation` type.
 *
 * These are used cross-domain (chat, conversations, logs, settings)
 * to classify conversations for UI gating and action availability.
 */

import type { Conversation } from "@/types/conversation-types";

/**
 * True when a `groupId` refers to a non-system (custom) group.
 * System groups use a `"system:"` prefix (e.g. `"system:pinned"`).
 */
export function isCustomGroupId(
  groupId: string | undefined,
): groupId is string {
  return !!groupId && !groupId.startsWith("system:");
}

/**
 * True when a conversation is pinned, via either the modern `isPinned`
 * boolean or

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