Announcing TypeScript 6.0 — Over six months in the making, TypeScript 6.0 is designed to bridge the gap between its self-hosted compiler and the (almost ready) Go-powered native compiler of TypeScript 7.0 . There are new features (Temporal improvements, RegExp.escape, and more), but most important are the changes to help you prepare for 7.0:

• Numerous default changes: strict is now true, module is esnext, rootDir defaults to ., and more.
• A change that will affect many apps is types defaulting to [] rather than pulling in everything from node_modules/@types.
• Numerous deprecations: the es5 target, emitting AMD, UMD, and SystemJS modules, --baseUrl, and others.
• --stableTypeOrdering makes 6.0's type ordering behavior match 7.0's to help diagnose inference differences as you update.

Daniel Rosenwasser (Microsoft)

Add Excel-like Spreadsheet Functionality to Your JavaScript Apps — SpreadJS is the industry-leading JavaScript spreadsheet for adding advanced spreadsheet features to your enterprise apps. Build finance, analysis, budget, and other apps. Excel I/O, 500+ calc functions, tables, charts, and more. View demos now.

SpreadJS from MESCIUS inc sponsor

The Three Pillars of JavaScript Bloat — Three reasons your node_modules is huge: needless ES3-era compat packages, micro-libraries with a single consumer, and ponyfills for APIs that shipped years ago! James, known for the e18e ecosystem performance project, offers some ways to calm the chaos.

James Garbutt

How Rewriting a Rust and WASM-Powered Parser in TypeScript Made it Faster — A counterintuitive result on the surface, but the WASM-JS boundary can introduce a serious performance penalty for many use cases, such that it can be 2-4x quicker to stay in the JS world.

Thesys Engineering Team

Clerk Auth for Chrome Extensions — Now in Vanilla JS — The Chrome Extension SDK now supports vanilla JS via createClerkClient(). Build popups and side panels without React. New quickstart included.

Clerk sponsor

📊 A React SSR Framework Performance Showdown — A large benchmark of TanStack Start, React Router, and Next.js under heavy load. The results led to patches benefitting both TanStack and React generally.

Matteo Collina (Platformatic)

Two React Design Choices Developers Don’t Like, But Can’t Avoid — Deferred state commits and dependency arrays on effects cause a lot of issues, but Ryan points out that signal-based alternatives (like Solid) only avoid them by staying synchronous.

Ryan Carniato

pnpm 11 Beta 0: A Sneak Peek — The efficiency-focused npm alternative continues its outsized impact on JS package management. It's moving to a SQLite-powered store, gets a configuration overhaul, and has stricter build security by default. Four new commands, too, including pnpm sbom for generating Software Bill of Materials JSON documents.

pnpm contributors

Edge.js: Running Node Apps Inside a WebAssembly Sandbox — A new, in-alpha runtime that maintains full Node compatibility while offering isolation via WebAssembly. Existing apps/modules run unmodified with system calls sandboxed, and the JS engine used is pluggable (between V8, JavaScriptCore and QuickJS). More info on the homepage.

Syrus Akbary (Wasmer)

Breakpoints and console.log Is the Past, Time Travel Is the Future — 15x faster JavaScript debugging than with breakpoints and console.log, supports Vitest, Jest, Karma, Jasmine, and more.

Wallaby Team sponsor

ArrowJS 1.0: Fast, Reactive UI Runtime Built on Platform Primitives — Built around ES modules, template literals and the DOM, it can also isolate component logic inside WASM sandboxes while rendering full inline DOM directly. First unveiled in 2022 by the creator of FormKit, it's now clearly finding its feet.

Justin Schroeder

Sugar High 1.0: A Lightweight JSX Syntax Highlighter — Doesn’t need React present, so you can use it for syntax highlighting JSX snippets anywhere. You can also theme it with CSS. GitHub repo.

Jiachi Liu