@langchain/core/dist/utils/tiktoken.js

Core LangChain.js abstractions and schemas

import { __exportAll } from "../_virtual/_rolldown/runtime.js";
import { AsyncCaller } from "./async_caller.js";
import { Tiktoken, getEncodingNameForModel } from "js-tiktoken/lite";
// src/utils/tiktoken.ts
var tiktoken_exports = /* @__PURE__ */ __exportAll({
	encodingForModel: () => encodingForModel,
	getEncoding: () => getEncoding
});
const cache = {};
const caller = /* #__PURE__ */ new AsyncCaller({});
async function getEncoding(encoding) {
	if (!(encoding in cache)) cache[encoding] = caller.fetch(`https://tiktoken.pages.dev/js/${encoding}.json`).then((res) => res.json()).then((data) => new Tiktoken(data)).catch((e) => {
		delete cache[encoding];
		throw e;
	});
	return await cache[encoding];
}
async function encodingForModel(model) {
	return getEncoding(getEncodingNameForModel(model));
}
export { encodingForModel, getEncoding, tiktoken_exports };

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