/**
 * Pending-todos reminder — TS port of
 * `forge_app::hooks::pending_todos::PendingTodosHandler`.
 *
 * Tracks the most recent todo snapshot per session (via opencode's
 * `todo.updated` event) and, when the session goes idle while todos are still
 * in `pending` or `in_progress` state, renders a reminder using the
 * `pending-todos-reminder` template so the agent re-engages instead of
 * stopping early.
 *
 * The forgecode implementation de-duplicates reminders by comparing todo-id
 * sets; we mirror that here.
 */
import type { ForgePendingTodo } from './types';
export declare class PendingTodosTracker {
    private readonly perSession;
    private readonly lastReminderKey;
    update(sessionId: string, todos: ForgePendingTodo[]): void;
    pending(sessionId: string): ForgePendingTodo[];
    reset(sessionId: string): void;
    /**
     * Returns the rendered reminder, or null when there is nothing new to
     * remind about (same set of pending todos already reminded).
     */
    buildReminder(sessionId: string): Promise<string | null>;
}
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