import type { AgentSession } from '../../../../services/agent-mon/model/agent-session.type.js';
import type { ProviderColumn } from './view-model.type.js';
/**
 * @purpose Group sessions by provider, compute per-column counts, and sort sessions within each column.
 * @invariant Sessions within each column are sorted: active → waiting → idle → completed.
 * @param sessions Flat array of agent sessions across all providers.
 * @param [opts] Optional overrides — isWaitingFn replaces default isWaitingForUser for testing.
 * @returns One ProviderColumn per unique provider, with sessions sorted by status priority.
 * @sideEffect None — pure transformation.
 */
export declare function groupByProvider(sessions: AgentSession[], opts?: {
    isWaitingFn?: (s: AgentSession) => boolean;
    limit?: number;
}): ProviderColumn[];