import type * as CallbackManagerModuleV02 from "@langchain/core/callbacks/manager";
import type { OITracer } from "@arizeai/openinference-core";
/**
 * Adds the {@link LangChainTracer} to the callback handlers if it is not already present
 * @param tracer the {@link tracer} to pass into the {@link LangChainTracer} when added to handlers
 * @param handlers the LangChain callback handlers which may be an array of handlers or a CallbackManager
 * @returns the callback handlers with the {@link LangChainTracer} added
 *
 * If the handlers are an array, we add the tracer to the array if it is not already present
 */
export declare function addTracerToHandlers(tracer: OITracer, handlers?: CallbackManagerModuleV02.Callbacks): CallbackManagerModuleV02.Callbacks;
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