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- "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.load = void 0;
- const serializable_js_1 = require("./serializable.cjs");
- const import_constants_js_1 = require("./import_constants.cjs");
- const coreImportMap = __importStar(require("./import_map.cjs"));
- const map_keys_js_1 = require("./map_keys.cjs");
- const env_js_1 = require("../utils/env.cjs");
- function combineAliasesAndInvert(constructor) {
- const aliases = {};
- for (
- // eslint-disable-next-line @typescript-eslint/no-this-alias
- let current = constructor; current && current.prototype; current = Object.getPrototypeOf(current)) {
- Object.assign(aliases, Reflect.get(current.prototype, "lc_aliases"));
- }
- return Object.entries(aliases).reduce((acc, [key, value]) => {
- acc[value] = key;
- return acc;
- }, {});
- }
- async function reviver(value) {
- const { optionalImportsMap = {}, optionalImportEntrypoints = [], importMap = {}, secretsMap = {}, path = ["$"], } = this;
- const pathStr = path.join(".");
- if (typeof value === "object" &&
- value !== null &&
- !Array.isArray(value) &&
- "lc" in value &&
- "type" in value &&
- "id" in value &&
- value.lc === 1 &&
- value.type === "secret") {
- const serialized = value;
- const [key] = serialized.id;
- if (key in secretsMap) {
- return secretsMap[key];
- }
- else {
- const secretValueInEnv = (0, env_js_1.getEnvironmentVariable)(key);
- if (secretValueInEnv) {
- return secretValueInEnv;
- }
- else {
- throw new Error(`Missing key "${key}" for ${pathStr} in load(secretsMap={})`);
- }
- }
- }
- else if (typeof value === "object" &&
- value !== null &&
- !Array.isArray(value) &&
- "lc" in value &&
- "type" in value &&
- "id" in value &&
- value.lc === 1 &&
- value.type === "not_implemented") {
- const serialized = value;
- const str = JSON.stringify(serialized);
- throw new Error(`Trying to load an object that doesn't implement serialization: ${pathStr} -> ${str}`);
- }
- else if (typeof value === "object" &&
- value !== null &&
- !Array.isArray(value) &&
- "lc" in value &&
- "type" in value &&
- "id" in value &&
- "kwargs" in value &&
- value.lc === 1) {
- const serialized = value;
- const str = JSON.stringify(serialized);
- const [name, ...namespaceReverse] = serialized.id.slice().reverse();
- const namespace = namespaceReverse.reverse();
- const importMaps = { langchain_core: coreImportMap, langchain: importMap };
- let module = null;
- const optionalImportNamespaceAliases = [namespace.join("/")];
- if (namespace[0] === "langchain_community") {
- optionalImportNamespaceAliases.push(["langchain", ...namespace.slice(1)].join("/"));
- }
- const matchingNamespaceAlias = optionalImportNamespaceAliases.find((alias) => alias in optionalImportsMap);
- if (import_constants_js_1.optionalImportEntrypoints
- .concat(optionalImportEntrypoints)
- .includes(namespace.join("/")) ||
- matchingNamespaceAlias) {
- if (matchingNamespaceAlias !== undefined) {
- module = await optionalImportsMap[matchingNamespaceAlias];
- }
- else {
- throw new Error(`Missing key "${namespace.join("/")}" for ${pathStr} in load(optionalImportsMap={})`);
- }
- }
- else {
- let finalImportMap;
- // Currently, we only support langchain and langchain_core imports.
- if (namespace[0] === "langchain" || namespace[0] === "langchain_core") {
- finalImportMap = importMaps[namespace[0]];
- namespace.shift();
- }
- else {
- throw new Error(`Invalid namespace: ${pathStr} -> ${str}`);
- }
- // The root namespace "langchain" is not a valid import.
- if (namespace.length === 0) {
- throw new Error(`Invalid namespace: ${pathStr} -> ${str}`);
- }
- // Find the longest matching namespace.
- let importMapKey;
- do {
- importMapKey = namespace.join("__");
- if (importMapKey in finalImportMap) {
- break;
- }
- else {
- namespace.pop();
- }
- } while (namespace.length > 0);
- // If no matching namespace is found, throw an error.
- if (importMapKey in finalImportMap) {
- module = finalImportMap[importMapKey];
- }
- }
- if (typeof module !== "object" || module === null) {
- throw new Error(`Invalid namespace: ${pathStr} -> ${str}`);
- }
- // Extract the builder from the import map.
- const builder =
- // look for a named export with the same name as the class
- module[name] ??
- // look for an export with a lc_name property matching the class name
- // this is necessary for classes that are minified
- Object.values(module).find((v) => typeof v === "function" &&
- (0, serializable_js_1.get_lc_unique_name)(v) === name);
- if (typeof builder !== "function") {
- throw new Error(`Invalid identifer: ${pathStr} -> ${str}`);
- }
- // Recurse on the arguments, which may be serialized objects themselves
- const kwargs = await reviver.call({ ...this, path: [...path, "kwargs"] }, serialized.kwargs);
- // Construct the object
- if (serialized.type === "constructor") {
- // eslint-disable-next-line new-cap, @typescript-eslint/no-explicit-any
- const instance = new builder((0, map_keys_js_1.mapKeys)(kwargs, map_keys_js_1.keyFromJson, combineAliasesAndInvert(builder)));
- // Minification in severless/edge runtimes will mange the
- // name of classes presented in traces. As the names in import map
- // are present as-is even with minification, use these names instead
- Object.defineProperty(instance.constructor, "name", { value: name });
- return instance;
- }
- else {
- throw new Error(`Invalid type: ${pathStr} -> ${str}`);
- }
- }
- else if (typeof value === "object" && value !== null) {
- if (Array.isArray(value)) {
- return Promise.all(value.map((v, i) => reviver.call({ ...this, path: [...path, `${i}`] }, v)));
- }
- else {
- return Object.fromEntries(await Promise.all(Object.entries(value).map(async ([key, value]) => [
- key,
- await reviver.call({ ...this, path: [...path, key] }, value),
- ])));
- }
- }
- return value;
- }
- async function load(text, mappings) {
- const json = JSON.parse(text);
- return reviver.call({ ...mappings }, json);
- }
- exports.load = load;
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