@langchain/core
Version:
Core LangChain.js abstractions and schemas
184 lines (183 loc) • 6.48 kB
JavaScript
"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.isBaseCallbackHandler = exports.BaseCallbackHandler = exports.callbackHandlerPrefersStreaming = void 0;
const uuid = __importStar(require("uuid"));
const serializable_js_1 = require("../load/serializable.cjs");
const env_js_1 = require("../utils/env.cjs");
/**
* Abstract class that provides a set of optional methods that can be
* overridden in derived classes to handle various events during the
* execution of a LangChain application.
*/
class BaseCallbackHandlerMethodsClass {
}
function callbackHandlerPrefersStreaming(x) {
return "lc_prefer_streaming" in x && x.lc_prefer_streaming;
}
exports.callbackHandlerPrefersStreaming = callbackHandlerPrefersStreaming;
/**
* Abstract base class for creating callback handlers in the LangChain
* framework. It provides a set of optional methods that can be overridden
* in derived classes to handle various events during the execution of a
* LangChain application.
*/
class BaseCallbackHandler extends BaseCallbackHandlerMethodsClass {
get lc_namespace() {
return ["langchain_core", "callbacks", this.name];
}
get lc_secrets() {
return undefined;
}
get lc_attributes() {
return undefined;
}
get lc_aliases() {
return undefined;
}
get lc_serializable_keys() {
return undefined;
}
/**
* The name of the serializable. Override to provide an alias or
* to preserve the serialized module name in minified environments.
*
* Implemented as a static method to support loading logic.
*/
static lc_name() {
return this.name;
}
/**
* The final serialized identifier for the module.
*/
get lc_id() {
return [
...this.lc_namespace,
(0, serializable_js_1.get_lc_unique_name)(this.constructor),
];
}
constructor(input) {
super();
Object.defineProperty(this, "lc_serializable", {
enumerable: true,
configurable: true,
writable: true,
value: false
});
Object.defineProperty(this, "lc_kwargs", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
Object.defineProperty(this, "ignoreLLM", {
enumerable: true,
configurable: true,
writable: true,
value: false
});
Object.defineProperty(this, "ignoreChain", {
enumerable: true,
configurable: true,
writable: true,
value: false
});
Object.defineProperty(this, "ignoreAgent", {
enumerable: true,
configurable: true,
writable: true,
value: false
});
Object.defineProperty(this, "ignoreRetriever", {
enumerable: true,
configurable: true,
writable: true,
value: false
});
Object.defineProperty(this, "ignoreCustomEvent", {
enumerable: true,
configurable: true,
writable: true,
value: false
});
Object.defineProperty(this, "raiseError", {
enumerable: true,
configurable: true,
writable: true,
value: false
});
Object.defineProperty(this, "awaitHandlers", {
enumerable: true,
configurable: true,
writable: true,
value: (0, env_js_1.getEnvironmentVariable)("LANGCHAIN_CALLBACKS_BACKGROUND") === "false"
});
this.lc_kwargs = input || {};
if (input) {
this.ignoreLLM = input.ignoreLLM ?? this.ignoreLLM;
this.ignoreChain = input.ignoreChain ?? this.ignoreChain;
this.ignoreAgent = input.ignoreAgent ?? this.ignoreAgent;
this.ignoreRetriever = input.ignoreRetriever ?? this.ignoreRetriever;
this.ignoreCustomEvent =
input.ignoreCustomEvent ?? this.ignoreCustomEvent;
this.raiseError = input.raiseError ?? this.raiseError;
this.awaitHandlers =
this.raiseError || (input._awaitHandler ?? this.awaitHandlers);
}
}
copy() {
return new this.constructor(this);
}
toJSON() {
return serializable_js_1.Serializable.prototype.toJSON.call(this);
}
toJSONNotImplemented() {
return serializable_js_1.Serializable.prototype.toJSONNotImplemented.call(this);
}
static fromMethods(methods) {
class Handler extends BaseCallbackHandler {
constructor() {
super();
Object.defineProperty(this, "name", {
enumerable: true,
configurable: true,
writable: true,
value: uuid.v4()
});
Object.assign(this, methods);
}
}
return new Handler();
}
}
exports.BaseCallbackHandler = BaseCallbackHandler;
const isBaseCallbackHandler = (x) => {
const callbackHandler = x;
return (callbackHandler !== undefined &&
typeof callbackHandler.copy === "function" &&
typeof callbackHandler.name === "string" &&
typeof callbackHandler.awaitHandlers === "boolean");
};
exports.isBaseCallbackHandler = isBaseCallbackHandler;