/**
 * Federation client — invokes commands on remote Manifest services.
 *
 * The client translates FederationRequest into HTTP calls, attaches
 * policy bridge headers, handles timeouts and retries, and normalizes
 * responses into FederationResponse objects.
 *
 * The client is transport-agnostic: pass a custom FederationTransport
 * to swap fetch for gRPC, message queues, or test fakes.
 *
 * @module federation/client
 */
import type { FederationRequest, FederationResponse, FederationClientOptions, FederationTransport, PolicyBridgeHeaders, ServiceDescriptor } from './types';
import { FederationRegistry } from './registry';
/**
 * Default HTTP transport using fetch.
 */
export declare class HttpFederationTransport implements FederationTransport {
    private fetchImpl;
    constructor(fetchImpl?: typeof fetch);
    invoke(descriptor: ServiceDescriptor, request: FederationRequest, options: {
        timeoutMs: number;
        authToken?: string;
    }): Promise<FederationResponse>;
}
/**
 * Build the set of policy bridge headers for a cross-service call.
 * Exported for testability and for custom transports.
 */
export declare function buildBridgeHeaders(bridge: PolicyBridgeHeaders): Record<string, string>;
/**
 * FederationClient: invokes commands on services in the federation.
 */
export declare class FederationClient {
    private registry;
    private options;
    private transport;
    constructor(registry: FederationRegistry, options?: FederationClientOptions, transport?: FederationTransport);
    /**
     * Invoke a command on a remote service.
     * Throws if the service/entity/command is not found in the registry.
     * Retries transient failures up to maxRetries times if the command is idempotent.
     */
    invoke(request: FederationRequest): Promise<FederationResponse>;
    private delay;
}
/**
 * Determine if a federation response represents a transient failure
 * that is safe to retry (e.g. network error, 5xx).
 */
export declare function isTransientFailure(response: FederationResponse): boolean;
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