@langchain/core/dist/memory.js

Core LangChain.js abstractions and schemas

import { __export } from "./_virtual/rolldown_runtime.js";

//#region src/memory.ts
var memory_exports = {};
__export(memory_exports, {
	BaseMemory: () => BaseMemory,
	getInputValue: () => getInputValue,
	getOutputValue: () => getOutputValue,
	getPromptInputKey: () => getPromptInputKey
});
/**
* Abstract base class for memory in LangChain's Chains. Memory refers to
* the state in Chains. It can be used to store information about past
* executions of a Chain and inject that information into the inputs of
* future executions of the Chain.
*/
var BaseMemory = class {};
const getValue = (values, key) => {
	if (key !== void 0) return values[key];
	const keys = Object.keys(values);
	if (keys.length === 1) return values[keys[0]];
};
/**
* This function is used by memory classes to select the input value
* to use for the memory. If there is only one input value, it is used.
* If there are multiple input values, the inputKey must be specified.
*/
const getInputValue = (inputValues, inputKey) => {
	const value = getValue(inputValues, inputKey);
	if (!value) {
		const keys = Object.keys(inputValues);
		throw new Error(`input values have ${keys.length} keys, you must specify an input key or pass only 1 key as input`);
	}
	return value;
};
/**
* This function is used by memory classes to select the output value
* to use for the memory. If there is only one output value, it is used.
* If there are multiple output values, the outputKey must be specified.
* If no outputKey is specified, an error is thrown.
*/
const getOutputValue = (outputValues, outputKey) => {
	const value = getValue(outputValues, outputKey);
	if (!value && value !== "") {
		const keys = Object.keys(outputValues);
		throw new Error(`output values have ${keys.length} keys, you must specify an output key or pass only 1 key as output`);
	}
	return value;
};
/**
* Function used by memory classes to get the key of the prompt input,
* excluding any keys that are memory variables or the "stop" key. If
* there is not exactly one prompt input key, an error is thrown.
*/
function getPromptInputKey(inputs, memoryVariables) {
	const promptInputKeys = Object.keys(inputs).filter((key) => !memoryVariables.includes(key) && key !== "stop");
	if (promptInputKeys.length !== 1) throw new Error(`One input key expected, but got ${promptInputKeys.length}`);
	return promptInputKeys[0];
}

//#endregion
export { BaseMemory, getInputValue, getOutputValue, getPromptInputKey, memory_exports };
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