https://takao.blog/en/tags/proxy/Recent content in Proxy on Commentary of TakaoHugo -- gohugo.ioenCommentary of TakaoSat, 13 Jun 2026 23:11:50 +0900https://takao.blog/en/web/js-proxy-reflect/Tue, 04 Jun 2024 00:00:00 +0900https://takao.blog/en/web/js-proxy-reflect/<img src="https://takao.blog/img/thumnail.webp" alt="Featured image of post JavaScript Proxy and Reflect API: Metaprogramming Patterns" /><p>JavaScript&rsquo;s <code>Proxy</code> and <code>Reflect</code> APIs are among the most powerful metaprogramming tools available in the language. They allow developers to intercept and customize fundamental operations on objects — property access, assignment, enumeration, function invocation, and even constructor calls. This article explores all 13 proxy traps, the complementary <code>Reflect</code> API, and real-world patterns used in production frameworks like Vue 3, MobX, and Immer.</p> <h2 id="understanding-the-proxy-pattern">Understanding the Proxy Pattern </h2><p>A <code>Proxy</code> wraps a target object and intercepts operations via handler functions called traps:</p>