/**
* Shared LangSmith Client Factory
* SPEC: SPEC-EVAL-001
*
* Single source of truth for LangSmith Client instances.
* All evaluation layers (trace-listener, dataset-manager, experiment-runner)
* share one Client instance to avoid duplicate connections.
*/
import { Client } from "langsmith";
import type { LangSmithConfig } from "./types.js";
let sharedClient: Client | null = null;
let sharedConfig: LangSmithConfig | null = null;
/**
* Get or create the shared LangSmith Client singleton.
*
* Returns the same Client instance for equivalent configs.
* If called with a different config, creates a new Client.
*/
export function getSharedClient(config: LangSmithConfig): Client {
if (sharedClient && sharedConfig?.apiKey === config.apiKey && sharedConfig?.apiUrl === config.apiUrl) {
return sharedClient;
}
sharedClient = new Client({
apiKey: config.apiKey,
apiUrl: config.apiUrl,
});
sharedConfig = config;
return sharedClient;
}
/**
* Clear the shared client. Used in tests.
*/
export function resetClient(): void {
sharedClient = null;
sharedConfig = null;
}
