From 49377d2663259cb292f8b968a101fd52f42665d1 Mon Sep 17 00:00:00 2001
From: kakkokari-gtyih <67428053+kakkokari-gtyih@users.noreply.github.com>
Date: Wed, 30 Sep 2026 23:55:39 +0900
Subject: [PATCH] =?UTF-8?q?fix:=20=E4=B8=80=E5=BA=A6=E8=A8=AD=E5=AE=9A?=
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---
 src/index.ts       |  5 ++++-
 test/index.test.ts | 21 ++++++++++++++++++++-
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index 75036ac6..27060006 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -81,7 +81,10 @@ export const version = _VERSION_ as string;
 export const summaly = async (url: string, options?: SummalyOptions): Promise<SummalyResult> => {
 	if (options?.agent) setAgent(options.agent);
 
-	const opts = Object.assign(summalyDefaultOptions, options);
+	const opts: SummalyOptions = {
+		...summalyDefaultOptions,
+		...options,
+	};
 
 	const plugins = builtinPlugins.concat(opts.plugins || []);
 
diff --git a/test/index.test.ts b/test/index.test.ts
index 4786eeb6..409746a0 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -15,7 +15,7 @@ import { Agent as httpAgent } from 'node:http';
 import { Agent as httpsAgent } from 'node:https';
 import { expect, test, describe, beforeEach, afterEach } from 'vitest';
 import fastify, { type FastifyInstance } from 'fastify';
-import { summaly } from '@/index.js';
+import { summaly, summalyDefaultOptions } from '@/index.js';
 import { StatusError } from '@/utils/status-error.js';
 
 const _filename = fileURLToPath(import.meta.url);
@@ -692,6 +692,25 @@ describe('local tests', () => {
 		});
 	});
 
+	describe('options', () => {
+		test('指定したオプションが以降の呼び出しに引き継がれないこと', async () => {
+			const content = fs.readFileSync(_dirname + '/htmls/basic.html');
+			const defaults = { ...summalyDefaultOptions };
+
+			app = fastify();
+			app.get('/', (request, reply) => {
+				reply.header('content-length', content.byteLength);
+				reply.header('content-type', 'text/html');
+				return reply.send(content);
+			});
+			await app.listen({ port });
+
+			await expect(summaly(host, { contentLengthLimit: content.byteLength - 1, userAgent: 'test-ua' })).rejects.toThrow();
+			expect(summalyDefaultOptions).toEqual(defaults);
+			expect(await summaly(host)).toBeDefined();
+		});
+	});
+
 	describe('content-length limit', () => {
 		test('content-lengthの上限以内であればエラーが起こらないこと', async () => {
 			const content = fs.readFileSync(_dirname + '/htmls/basic.html');