@langchain/core/dist/runnables/iter.js

Core LangChain.js abstractions and schemas

import { AsyncLocalStorageProviderSingleton } from "../singletons/async_local_storage/index.js";
import "../singletons/index.js";
import { pickRunnableConfigKeys } from "./config.js";

//#region src/runnables/iter.ts
function isIterableIterator(thing) {
	return typeof thing === "object" && thing !== null && typeof thing[Symbol.iterator] === "function" && typeof thing.next === "function";
}
const isIterator = (x) => x != null && typeof x === "object" && "next" in x && typeof x.next === "function";
function isAsyncIterable(thing) {
	return typeof thing === "object" && thing !== null && typeof thing[Symbol.asyncIterator] === "function";
}
function isAsyncGenerator(x) {
	return x != null && typeof x === "object" && typeof x.next === "function";
}
async function consumeAsyncGenerator(generator, onYield) {
	try {
		let iterResult = await generator.next();
		while (!iterResult.done) {
			await onYield?.(iterResult.value);
			iterResult = await generator.next();
		}
		return iterResult.value;
	} finally {
		await generator.return?.(void 0);
	}
}
function* consumeIteratorInContext(context, iter) {
	while (true) {
		const { value, done } = AsyncLocalStorageProviderSingleton.runWithConfig(pickRunnableConfigKeys(context), iter.next.bind(iter), true);
		if (done) break;
		else yield value;
	}
}
async function* consumeAsyncIterableInContext(context, iter) {
	const iterator = iter[Symbol.asyncIterator]();
	while (true) {
		const { value, done } = await AsyncLocalStorageProviderSingleton.runWithConfig(pickRunnableConfigKeys(context), iterator.next.bind(iter), true);
		if (done) break;
		else yield value;
	}
}

//#endregion
export { consumeAsyncGenerator, consumeAsyncIterableInContext, consumeIteratorInContext, isAsyncGenerator, isAsyncIterable, isIterableIterator, isIterator };
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