import type { SchedulingPolicy, TaskQueueSummary } from './task-queue-types.ts';
/**
 * Read-only snapshot of the fields {@link buildQueueSummaries} needs. Captured
 * synchronously by {@link TaskQueue.captureSnapshot} so all reads happen within
 * a single turn of the event loop — no locks required.
 *
 * This type is internal to the server package and must not be re-exported from
 * the public barrel.
 */
export type TaskQueueSnapshot = {
    /** Shallow copy of queue → pending task metadata (only `enqueuedAt` is read). */
    pending: ReadonlyMap<string, ReadonlyArray<{
        enqueuedAt?: number | undefined;
    }>>;
    /** Shallow copy of queue → waiter array (only `length` is read). */
    waiters: ReadonlyMap<string, ReadonlyArray<unknown>>;
    /** Scheduling policy the queue was configured with. */
    schedulingPolicy: SchedulingPolicy;
};
/**
 * Build the sorted per-queue summary list from a synchronously captured
 * snapshot. Pure function: no live registry references, no side effects.
 *
 * Returns one entry per queue name appearing in either `pending` or `waiters`,
 * sorted ascending by queue name so responses are stable.
 */
export declare function buildQueueSummaries(snapshot: TaskQueueSnapshot): TaskQueueSummary[];