@jsconfjp

https://xitter.cf/t.co/3vxsuNX429 will begin at November 16th.

 Japan
jsconf.jp
Joined August 2018
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20Media
Why did Object.observe disappear, and how did flatten become flat()? Prisma engineer Nurul Sundarani explores abandoned JavaScript proposals in “The TC39 Graveyard” at JSConf JP 2026. jsconf.jp/2026/en/talks/nuru… #jsconfjp #TC39

The TC39 Graveyard: Proposals That Died So JavaScript Could Live | JSConf JP 2026

JavaScript has shipped hundreds of features. This talk is about the ones it buried. - Object.observe made it all the way into Chrome and then got ripped back out. - SIMD.js had Intel engineers,...

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なぜObject.observeは撤回され、flattenはflat()になったのか？PrismaのNurul Sundaraniさんが、消えたJavaScript仕様提案から言語設計の舞台裏を紹介するJSConf JP 2026のLT「The TC39 Graveyard」。 jsconf.jp/2026/en/talks/nuru… #jsconfjp #TC39

The TC39 Graveyard: Proposals That Died So JavaScript Could Live | JSConf JP 2026

JavaScript has shipped hundreds of features. This talk is about the ones it buried. - Object.observe made it all the way into Chrome and then got ripped back out. - SIMD.js had Intel engineers,...

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We show speakers on top page. This speakers list are random. #jsconfjp jsconf.jp/2026/
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In September 2025, a fake 2FA reset email led to Josh Junon's npm account being compromised. At JSConf.jp, the Chalk and Debug maintainer shares what he learned from being hacked in “Yep, I've Been Pwned.” jsconf.jp/2026/en/talks/josh… #jsconfjp
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2025年9月、npmアカウントを乗っ取られたJosh Junonさん。Chalk・Debugを支えるメンテナーが、被害から何を学んだのか。JSConf.jpの基調講演で、当事者の経験を聞きます。 jsconf.jp/2026/en/talks/josh… #jsconfjp
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We interviewed Brendan Eich! - Why the name "Java"Script? - Regrets from those first 10 days? - Where will AI take coding? - Thoughts on web monetization? - The future of browsers? ...and more. You'll enjoy this one 🎙️ #jsconfjp jsconf.jp/2026/en/talks/bren…

An Interview with Brendan Eich — 30 Years of JavaScript: Past, Present, and Future | JSConf JP 2026

An interview with Brendan Eich, the creator of JavaScript. From the untold story of its creation in 1995, through 30 years of standardization and evolution, to where JavaScript and the web are headed...

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Brendan Eichさんと - なんで "Java"Script って名前にしたの？ - 最初の10日間での実装の後悔は？ - AI実装でどうなっていくと思う？ - Webの収益についてどう思う？ - 今後のブラウザは？ などなど、インタビューをしてきました。楽しめると思います。 #jsconfjp jsconf.jp/2026/en/talks/bren…

An Interview with Brendan Eich — 30 Years of JavaScript: Past, Present, and Future | JSConf JP 2026

An interview with Brendan Eich, the creator of JavaScript. From the untold story of its creation in 1995, through 30 years of standardization and evolution, to where JavaScript and the web are headed...

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Where does browser-based test overhead come from? ypresto measures startup, transforms, loading, execution and parallelism across jsdom / happy-dom and Vitest Browser Mode, exploring a single setup for component tests. jsconf.jp/2026/en/talks/ypre… #jsconfjp

The Cost of the DOM ― jsdom / happy-dom とVitest Browser Modeの実行時間を分解する | JSConf JP 2026

コンポーネントのテストをjsdom (happy-dom) で動かすか、実ブラウザで動かすか。 純粋関数やhooksのテストにDOMは要りませんが、コンポーネントは視覚的なものなので、動作やデザインの確認には実ブラウザが必要です。 近年はVitest Browser Mode、そしてStorybook Vitest Addonにより、コンポーネントのテストを簡便に実行できる環境が実現されました。...

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「実ブラウザでのテストは重い」。そのコストはどこに？ yprestoさんがjsdom / happy-domとVitest Browser Modeを比較。起動・コード変換・読み込み・テスト実行・並列化まで測り、テスト環境を一本化できるか探ります。 jsconf.jp/2026/en/talks/ypre… #jsconfjp

The Cost of the DOM ― jsdom / happy-dom とVitest Browser Modeの実行時間を分解する | JSConf JP 2026

コンポーネントのテストをjsdom (happy-dom) で動かすか、実ブラウザで動かすか。 純粋関数やhooksのテストにDOMは要りませんが、コンポーネントは視覚的なものなので、動作やデザインの確認には実ブラウザが必要です。 近年はVitest Browser Mode、そしてStorybook Vitest Addonにより、コンポーネントのテストを簡便に実行できる環境が実現されました。...

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JSConf Japan retweeted
Aileen Villanueva
@aileenvlOct 13
Super excited to speak at @jsconfjp this year 🫶🏻 see you all there 🇯🇵 Tickets still available jsconf.jp/2026/en

JSConf JP 2026

jsconf.jp is a JavaScript festival in Japan powered by Japan Node.js Association. This is the seventh time event of jsconf in Japan. We would love to become a bridge between Japanese Web Developers...

jsconf.jp
JSConf Japan@jsconfjpOct 13
AI writes the code. Who defines intent and verifies the result? Aileen Villanueva explores specs, MCP, types and tests as tools for AI-assisted development, plus WebMCP for apps that agents can use directly. jsconf.jp/2026/en/talks/aile… #jsconfjp

When AI writes the code, what do JavaScript developers write? | JSConf JP 2026

AI can now generate components, APIs, tests, database queries, and sometimes entire features. If writing the code is no longer the hardest part of building software, what does the JavaScript develo...

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AI writes the code. Who defines intent and verifies the result? Aileen Villanueva explores specs, MCP, types and tests as tools for AI-assisted development, plus WebMCP for apps that agents can use directly. jsconf.jp/2026/en/talks/aile… #jsconfjp

When AI writes the code, what do JavaScript developers write? | JSConf JP 2026

AI can now generate components, APIs, tests, database queries, and sometimes entire features. If writing the code is no longer the hardest part of building software, what does the JavaScript develo...

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AIがコードを書く時代、JS開発者は何を書く？ Aileen Villanuevaさんが、仕様やMCPによる文脈づくり、型・テストによる制約と検証、WebMCPでエージェントも使えるWebアプリまで、開発者の役割の変化を掘り下げます。 jsconf.jp/2026/en/talks/aile… #jsconfjp

When AI writes the code, what do JavaScript developers write? | JSConf JP 2026

AI can now generate components, APIs, tests, database queries, and sometimes entire features. If writing the code is no longer the hardest part of building software, what does the JavaScript develo...

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Why does a React optimization work? Saman Abaasi traces a janky component through Fiber, priority lanes and interrupted renders to show what useTransition/useDeferredValue change. Build a mental model of the scheduler. #jsconfjp jsconf.jp/2026/en/talks/sama…

React Fiber Unplugged: How the Internal Scheduler Shapes React | JSConf JP 2026

Underneath every React render is a scheduler making constant decisions: what to work on next, what to interrupt, what to discard, and what to prioritize. Those decisions — not your component code —...

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Reactは何を優先し、いつ処理を中断する？Saman Abaasiがカクつくコンポーネントを追い、FiberとuseTransition/useDeferredValueの働きを解説。「なぜその最適化が効くのか」を内部から理解するセッション。 #jsconfjp jsconf.jp/2026/en/talks/sama…

React Fiber Unplugged: How the Internal Scheduler Shapes React | JSConf JP 2026

Underneath every React render is a scheduler making constant decisions: what to work on next, what to interrupt, what to discard, and what to prioritize. Those decisions — not your component code —...

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jsconf.jp 2026 connpass open! nodejs.connpass.com/event/40… #jsconfjp
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盗まれたトークンから、不正なパッケージ公開につながるリスク。 Jessie「Your Node.js App Is Lying to You: What axios Taught Us」では、npm auditやlockfileの限界、依存差分・公開元の検証、CIの防御を掘り下げます。 jsconf.jp/2026/en/talks/jess… #jsconfjp

Your Node.js App Is Lying to You: What axios Taught Us | JSConf JP 2026

On 31 March 2026, axios, a package downloaded 100 million times a week, quietly turned into a malware delivery system for about three hours. Every project that ran npm install in that window was...

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npm audit and lockfiles have limits. Jessie explores what axios taught us about dependency diff reviews, verifying provenance with Sigstore, and protecting CI against stolen tokens and unauthorized publishing. jsconf.jp/2026/en/talks/jess… #jsconfjp

Your Node.js App Is Lying to You: What axios Taught Us | JSConf JP 2026

On 31 March 2026, axios, a package downloaded 100 million times a week, quietly turned into a malware delivery system for about three hours. Every project that ran npm install in that window was...

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AI in Chrome: summarize, translate, and expose tools to agents. Kevin Uehara explores Web AI APIs and WebMCP with practical examples, comparing local vs. cloud execution and the impact on privacy, latency, cost and UX. jsconf.jp/2026/en/talks/kevi… #jsconfjp

WebMCP and WebAI: Exploring native AI tools in Chrome | JSConf JP 2026

Artificial Intelligence is no longer exclusive to servers and cloud models, but has become a native part of the browser. At Google I/O 2025, Chrome presented a set of Web AI APIs that allow for text...

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ChromeのAI、Webアプリでどう使う？ Kevin UeharaがWeb AI APIによる要約・翻訳と、AIエージェント向けにツールを公開するWebMCPを解説。ローカル／クラウド実行を比べ、プライバシー・遅延・コストへの影響を探ります。 jsconf.jp/2026/ja/talks/kevi… #jsconfjp

WebMCP and WebAI: Exploring native AI tools in Chrome | JSConf JP 2026

人工知能はもはやサーバーやクラウドモデルだけのものではなく、ブラウザにネイティブに組み込まれるようになりました。Google I/O 2025において、Chromeはテキスト要約、言語検出、コンテンツ翻訳、メッセージ書き換えなど、さまざまな機能をブラウザ内で直接利用できるWeb AI API群を発表しました。これらの機能はすべて、組み込みのGemini Nanoモデルのサポートによって実現さ...

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V8の最適化 Array.prototype.flat高速化の鍵は「数値配列にサブ配列はない」。Yuta NishiさんがElementsKindによる走査の省略、2パスでの一括メモリ確保、holeを詰める仕様を解説。V8に実装をマージする道のりも。 11/22 JSConf.jp #jsconfjp jsconf.jp/2026/ja/talks/yuta…
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