@langchain/core/dist/tracers/console.d.ts

Core LangChain.js abstractions and schemas

import { BaseTracer, type Run } from "./base.js";
/**
 * A tracer that logs all events to the console. It extends from the
 * `BaseTracer` class and overrides its methods to provide custom logging
 * functionality.
 * @example
 * ```typescript
 *
 * const llm = new ChatAnthropic({
 *   temperature: 0,
 *   tags: ["example", "callbacks", "constructor"],
 *   callbacks: [new ConsoleCallbackHandler()],
 * });
 *
 * ```
 */
export declare class ConsoleCallbackHandler extends BaseTracer {
    name: "console_callback_handler";
    /**
     * Method used to persist the run. In this case, it simply returns a
     * resolved promise as there's no persistence logic.
     * @param _run The run to persist.
     * @returns A resolved promise.
     */
    protected persistRun(_run: Run): Promise<void>;
    /**
     * Method used to get all the parent runs of a given run.
     * @param run The run whose parents are to be retrieved.
     * @returns An array of parent runs.
     */
    getParents(run: Run): Run[];
    /**
     * Method used to get a string representation of the run's lineage, which
     * is used in logging.
     * @param run The run whose lineage is to be retrieved.
     * @returns A string representation of the run's lineage.
     */
    getBreadcrumbs(run: Run): string;
    /**
     * Method used to log the start of a chain run.
     * @param run The chain run that has started.
     * @returns void
     */
    onChainStart(run: Run): void;
    /**
     * Method used to log the end of a chain run.
     * @param run The chain run that has ended.
     * @returns void
     */
    onChainEnd(run: Run): void;
    /**
     * Method used to log any errors of a chain run.
     * @param run The chain run that has errored.
     * @returns void
     */
    onChainError(run: Run): void;
    /**
     * Method used to log the start of an LLM run.
     * @param run The LLM run that has started.
     * @returns void
     */
    onLLMStart(run: Run): void;
    /**
     * Method used to log the end of an LLM run.
     * @param run The LLM run that has ended.
     * @returns void
     */
    onLLMEnd(run: Run): void;
    /**
     * Method used to log any errors of an LLM run.
     * @param run The LLM run that has errored.
     * @returns void
     */
    onLLMError(run: Run): void;
    /**
     * Method used to log the start of a tool run.
     * @param run The tool run that has started.
     * @returns void
     */
    onToolStart(run: Run): void;
    /**
     * Method used to log the end of a tool run.
     * @param run The tool run that has ended.
     * @returns void
     */
    onToolEnd(run: Run): void;
    /**
     * Method used to log any errors of a tool run.
     * @param run The tool run that has errored.
     * @returns void
     */
    onToolError(run: Run): void;
    /**
     * Method used to log the start of a retriever run.
     * @param run The retriever run that has started.
     * @returns void
     */
    onRetrieverStart(run: Run): void;
    /**
     * Method used to log the end of a retriever run.
     * @param run The retriever run that has ended.
     * @returns void
     */
    onRetrieverEnd(run: Run): void;
    /**
     * Method used to log any errors of a retriever run.
     * @param run The retriever run that has errored.
     * @returns void
     */
    onRetrieverError(run: Run): void;
    /**
     * Method used to log the action selected by the agent.
     * @param run The run in which the agent action occurred.
     * @returns void
     */
    onAgentAction(run: Run): void;
}