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🌐Frontend Dev

Frontend web development and UI engineering

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Test yourself: Top 30 Frontend Dev questions on recent updates →Multiple choice, with the correct answer and why it is correct on every question. Free, no sign-in.

Latest in Frontend Dev, page 2

Mozilla WAICT Verifies Web App JavaScript in Nightly
intermediate2 min read

Mozilla WAICT Verifies Web App JavaScript in Nightly

WAICT in Firefox Nightly binds client code to public manifests so browsers reject unlogged JavaScript. This stops compromised servers from silently injecting malicious code into encrypted web apps like Signal. Test it at waict.dev.

Claude Mythos Cracks Firefox Bugs Fuzzing Missed
intermediate1 min read

Claude Mythos Cracks Firefox Bugs Fuzzing Missed

Claude Mythos Preview found 20-year-old XSLT and JIT bugs in Firefox that survived years of fuzzing. Mozilla shows AI now catches sandbox escapes and memory corruption. Add LLM security scanning to hardening workflows before attackers adopt them.

Firefox 151 adds Web Serial for desktop
intermediate1 min read

Firefox 151 adds Web Serial for desktop

Firefox 151 for Desktop adds Web Serial support for compatible hardware. It gives web-based device tools another browser to support. Check permissions, operating-system support and actual devices before removing a native fallback.

Kent C. Dodds Fixes Accidental Monorepo with Workspaces
intermediate2 min read

Kent C. Dodds Fixes Accidental Monorepo with Workspaces

Kent C. Dodds consolidated four deployable apps into a proper npm workspace, deleting three nested lockfiles and adding minimal Nx caching. The migration exposed hardcoded paths and invalid package aliases that broke production once Node enforced package…

Cloudflare Sandboxes Cut Container Heartbeat Plumbing
intermediate2 min read

Cloudflare Sandboxes Cut Container Heartbeat Plumbing

Kent C. Dodds replaced Cloudflare Containers with Sandboxes, deleting heartbeat and shutdown logic for his FFmpeg pipeline. PR #729 uses one-shot exec() inside the existing queue worker, cutting deploy surface and eliminating long-lived service orchestration.

Kent C. Dodds Adds SQLite FTS5 to Vector Search
intermediate1 min read

Kent C. Dodds Adds SQLite FTS5 to Vector Search

Kent C. Dodds added SQLite FTS5 to Vectorize embeddings after semantic search missed exact matches like "React Testing Library." The hybrid pipeline uses Reciprocal Rank Fusion. If your search fails on API names, add BM25 backup, not bigger embedding models.

intermediate1 min read

Vercel Connect replaces env tokens with runtime OIDC

Vercel Connect Public Beta replaces static env tokens with short-lived, task-scoped credentials exchanged at runtime via OIDC. Agents request least-privilege access per job instead of holding long-lived shared secrets, eliminating manual rotation when…

intermediate2 min read

Vercel ships AI Gateway, Workflow SDK, and Sandbox for agents

Vercel Agent Stack unifies hundreds of models, durable workflows, and isolated microVMs for production agents. One endpoint routes across providers, checkpoints resume failed runs, and sandboxes isolate unreviewed code.

intermediate2 min read

Vercel Ship 2026: agent stack, eve framework, and microservices

Vercel Ship 2026 unveils open-source eve framework and Vercel Services for microservices July 1. Vercel is repositioning as agentic infrastructure with Connect credentials and expanded Python backends. Evaluate if your next agent deploys here instead of AWS.

Next.js 16.2 brings 67-100% faster server Fast Refresh
intermediate2 min read

Next.js 16.2 brings 67-100% faster server Fast Refresh

Next.js 16.2 Turbopack brings Server Fast Refresh to Node.js, cutting reload times 67-100% and compile times 400-900%. Only changed modules reload, not whole chains. WASM Workers, SRI, and dynamic import tree shaking land; upgrade to cut dev latency.

Next.js 16.2 adds agent-native dev tooling
intermediate1 min read

Next.js 16.2 adds agent-native dev tooling

Next.js 16.2 bundles version-matched docs with create-next-app, hitting 100% on framework evals versus 79% without. Browser errors now forward to terminal and a dev server lock file prevents agent confusion. Upgrade if you use AI coding agents.

Next.js 16.2 ships stable Adapter API for all platforms
intermediate1 min read

Next.js 16.2 ships stable Adapter API for all platforms

Next.js 16.2 ships a stable Adapter API co-built with OpenNext, Netlify, and Cloudflare. The typed build contract lets any platform target full framework fidelity using the same public hooks Vercel uses. Stop reverse-engineering build output.

Server Components, explained without the jargon
easy2 min read

Server Components, explained without the jargon

React Server Components render on the server and send the client a description of the result, not JavaScript. That means no bundle cost for server rendered parts and direct database access, with client components handling only the interactive pieces.

React interview cheatsheet: hooks rules in 60 seconds
easy2 min read

React interview cheatsheet: hooks rules in 60 seconds

The rules of hooks exist because React identifies each hook by call order, not by name. Call hooks only at the top level of a component or custom hook, never inside a loop, condition, or nested function, or state attaches to the wrong hook.

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