@langchain/core
Version:
Core LangChain.js abstractions and schemas
176 lines (175 loc) • 6.57 kB
JavaScript
;
// Default generic "any" values are for backwards compatibility.
// Replace with "string" when we are comfortable with a breaking change.
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 () {
var ownKeys = function(o) {
ownKeys = Object.getOwnPropertyNames || function (o) {
var ar = [];
for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
return ar;
};
return ownKeys(o);
};
return function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
__setModuleDefault(result, mod);
return result;
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.BasePromptTemplate = void 0;
const base_js_1 = require("../runnables/base.cjs");
/**
* Base class for prompt templates. Exposes a format method that returns a
* string prompt given a set of input values.
*/
class BasePromptTemplate extends base_js_1.Runnable {
get lc_attributes() {
return {
partialVariables: undefined, // python doesn't support this yet
};
}
constructor(input) {
super(input);
Object.defineProperty(this, "lc_serializable", {
enumerable: true,
configurable: true,
writable: true,
value: true
});
Object.defineProperty(this, "lc_namespace", {
enumerable: true,
configurable: true,
writable: true,
value: ["langchain_core", "prompts", this._getPromptType()]
});
Object.defineProperty(this, "inputVariables", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
Object.defineProperty(this, "outputParser", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
Object.defineProperty(this, "partialVariables", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
/**
* Metadata to be used for tracing.
*/
Object.defineProperty(this, "metadata", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
/** Tags to be used for tracing. */
Object.defineProperty(this, "tags", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
const { inputVariables } = input;
if (inputVariables.includes("stop")) {
throw new Error("Cannot have an input variable named 'stop', as it is used internally, please rename.");
}
Object.assign(this, input);
}
/**
* Merges partial variables and user variables.
* @param userVariables The user variables to merge with the partial variables.
* @returns A Promise that resolves to an object containing the merged variables.
*/
async mergePartialAndUserVariables(userVariables) {
const partialVariables = this.partialVariables ?? {};
const partialValues = {};
for (const [key, value] of Object.entries(partialVariables)) {
if (typeof value === "string") {
partialValues[key] = value;
}
else {
partialValues[key] = await value();
}
}
const allKwargs = {
...partialValues,
...userVariables,
};
return allKwargs;
}
/**
* Invokes the prompt template with the given input and options.
* @param input The input to invoke the prompt template with.
* @param options Optional configuration for the callback.
* @returns A Promise that resolves to the output of the prompt template.
*/
async invoke(input, options) {
const metadata = {
...this.metadata,
...options?.metadata,
};
const tags = [...(this.tags ?? []), ...(options?.tags ?? [])];
return this._callWithConfig((input) => this.formatPromptValue(input), input, { ...options, tags, metadata, runType: "prompt" });
}
/**
* Return a json-like object representing this prompt template.
* @deprecated
*/
serialize() {
throw new Error("Use .toJSON() instead");
}
/**
* @deprecated
* Load a prompt template from a json-like object describing it.
*
* @remarks
* Deserializing needs to be async because templates (e.g. {@link FewShotPromptTemplate}) can
* reference remote resources that we read asynchronously with a web
* request.
*/
static async deserialize(data) {
switch (data._type) {
case "prompt": {
const { PromptTemplate } = await Promise.resolve().then(() => __importStar(require("./prompt.cjs")));
return PromptTemplate.deserialize(data);
}
case undefined: {
const { PromptTemplate } = await Promise.resolve().then(() => __importStar(require("./prompt.cjs")));
return PromptTemplate.deserialize({ ...data, _type: "prompt" });
}
case "few_shot": {
const { FewShotPromptTemplate } = await Promise.resolve().then(() => __importStar(require("./few_shot.cjs")));
return FewShotPromptTemplate.deserialize(data);
}
default:
throw new Error(`Invalid prompt type in config: ${data._type}`);
}
}
}
exports.BasePromptTemplate = BasePromptTemplate;