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common.ts
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common.ts
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import { StructuredToolInterface } from "@langchain/core/tools";
import type {
GeminiTool,
GoogleAIBaseLanguageModelCallOptions,
GoogleAIModelParams,
GoogleAIModelRequestParams,
GoogleLLMModelFamily,
} from "../types.js";
import { isModelGemini, validateGeminiParams } from "./gemini.js";
export function copyAIModelParams(
params: GoogleAIModelParams | undefined,
options: GoogleAIBaseLanguageModelCallOptions | undefined
): GoogleAIModelRequestParams {
return copyAIModelParamsInto(params, options, {});
}
export function copyAIModelParamsInto(
params: GoogleAIModelParams | undefined,
options: GoogleAIBaseLanguageModelCallOptions | undefined,
target: GoogleAIModelParams
): GoogleAIModelRequestParams {
const ret: GoogleAIModelRequestParams = target || {};
const model = options?.model ?? params?.model ?? target.model;
ret.modelName =
model ?? options?.modelName ?? params?.modelName ?? target.modelName;
ret.model = model;
ret.temperature =
options?.temperature ?? params?.temperature ?? target.temperature;
ret.maxOutputTokens =
options?.maxOutputTokens ??
params?.maxOutputTokens ??
target.maxOutputTokens;
ret.topP = options?.topP ?? params?.topP ?? target.topP;
ret.topK = options?.topK ?? params?.topK ?? target.topK;
ret.stopSequences =
options?.stopSequences ?? params?.stopSequences ?? target.stopSequences;
ret.safetySettings =
options?.safetySettings ?? params?.safetySettings ?? target.safetySettings;
ret.convertSystemMessageToHumanContent =
options?.convertSystemMessageToHumanContent ??
params?.convertSystemMessageToHumanContent ??
target?.convertSystemMessageToHumanContent;
ret.responseMimeType =
options?.responseMimeType ??
params?.responseMimeType ??
target?.responseMimeType;
ret.tools = options?.tools;
// Ensure tools are formatted properly for Gemini
const geminiTools = options?.tools
?.map((tool) => {
if (
"function" in tool &&
// eslint-disable-next-line @typescript-eslint/no-explicit-any
"parameters" in (tool.function as Record<string, any>)
) {
// Tool is in OpenAI format. Convert to Gemini then return.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const castTool = tool.function as Record<string, any>;
const cleanedParameters = castTool.parameters;
if ("$schema" in cleanedParameters) {
delete cleanedParameters.$schema;
}
if ("additionalProperties" in cleanedParameters) {
delete cleanedParameters.additionalProperties;
}
const toolInGeminiFormat: GeminiTool = {
functionDeclarations: [
{
name: castTool.name,
description: castTool.description,
parameters: cleanedParameters,
},
],
};
return toolInGeminiFormat;
} else if ("functionDeclarations" in tool) {
return tool;
} else {
return null;
}
})
.filter((tool): tool is GeminiTool => tool !== null);
const structuredOutputTools = options?.tools
?.map((tool) => {
if ("lc_namespace" in tool) {
return tool;
} else {
return null;
}
})
.filter((tool): tool is StructuredToolInterface => tool !== null);
if (
structuredOutputTools &&
structuredOutputTools.length > 0 &&
geminiTools &&
geminiTools.length > 0
) {
throw new Error(
`Cannot mix structured tools with Gemini tools.\nReceived ${structuredOutputTools.length} structured tools and ${geminiTools.length} Gemini tools.`
);
}
ret.tools = geminiTools ?? structuredOutputTools;
return ret;
}
export function modelToFamily(
modelName: string | undefined
): GoogleLLMModelFamily {
if (!modelName) {
return null;
} else if (isModelGemini(modelName)) {
return "gemini";
} else {
return null;
}
}
export function validateModelParams(
params: GoogleAIModelParams | undefined
): void {
const testParams: GoogleAIModelParams = params ?? {};
const model = testParams.model ?? testParams.modelName;
switch (modelToFamily(model)) {
case "gemini":
return validateGeminiParams(testParams);
default:
throw new Error(
`Unable to verify model params: ${JSON.stringify(params)}`
);
}
}
export function copyAndValidateModelParamsInto(
params: GoogleAIModelParams | undefined,
target: GoogleAIModelParams
): GoogleAIModelParams {
copyAIModelParamsInto(params, undefined, target);
validateModelParams(target);
return target;
}