import type { CompletionRequest } from '../types/messages.js';
import type { NexusAIConfig } from '../types/config.js';
import type { BaseProvider } from '../providers/base.js';
import type { RouteDecision } from './types.js';
import type { ProviderHealthSnapshot } from '../ops/health.js';
/**
 * Chooses where a request goes: a direct model, a matching rule, or the auto-router's ranking, with
 * the fallbacks `routing.fallback` adds on top.
 */
export declare class Router {
    private autoRouter;
    private rulesRouter;
    /** Routes one request. Throws when a directly named model's provider is not configured. */
    route(request: CompletionRequest, config: NexusAIConfig, providers: Map<string, BaseProvider>, health?: ProviderHealthSnapshot[], openCircuits?: readonly string[]): RouteDecision;
    private choose;
}
export type { RouteAttempt, RouteDecision, RouterContext } from './types.js';
export { FailoverExecutor } from './failover.js';