TypeScript and JavaScript dominate on GitHub in 2025

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Plus building the same app ten times to test framework performance, and why NaN !== NaN. |

#​759 — October 31, 2025

Read on the Web
Together with  Mescius

JavaScript Weekly

Directives and the Platform Boundary — First there was the "use strict" directive to opt in to strict mode in JavaScript, but now you'll encounter use client, use server, React's new use no memo, and more, and they're not standard JS features at all. Tanner thinks this proliferation of directives comes at a cost, with an increased risk of framework and tooling lock-in.

Tanner Linsley (TanStack)

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

🏆 TypeScript Leaps to #1 Most Used Language on GitHub — As part of this week's GitHub Universe event, GitHub released its annual report of activity on the platform. A year ago, Python jumped to #1, pushing JavaScript to #3, but this year TypeScript takes the crown and GitHub suggests LLM-oriented development played a role. Taking JavaScript and TypeScript together, however, places our ecosystem far out in front.

GitHub

IN BRIEF:

RELEASES:

📖  Articles and Videos

I Built the Same App 10 Times: Evaluating Frameworks for Mobile Performance — When targeting mobile devices, small bundle sizes and quick rendering times are key, so Loren wanted to see how different approaches compared. Marko, SolidStart, SvelteKit, Qwik, Nuxt, Next.js and more are all under the spotlight here.

Loren Stewart

▶  The Origin Story of JavaScript — Annie takes us all the way back to the start of the Web in the early 90s and walks us through the conditions and advancements that enabled JavaScript to take off, all the way through to our modern framework-oriented, tool-rich ecosystem. (25 minutes.)

Annie Sexton

Still Writing Tests Manually? — See why modern engineering teams like Dropbox, Notion and Wiz rely on Meticulous to run E2E UI tests.

Meticulous AI sponsor

Why NaN !== NaN in JavaScript (and the IEEE 754 Story Behind It) — NaN is a number, but it's also Not a Number! This leads to some well-known quirky behavior, but JavaScript isn't to blame.

Piotr Zarycki

What I Learned Porting Mastro from Deno to Node — Mastro is a site generator originally for Deno only. But if Deno is compatible with Node, is it easy to make Deno-facing code run on Node too? Not exactly, but it's possible.

Mauro Bieg

📄 Migrating from Node.js v22 to v24 – Now that v24 is the active LTS release, it's time to upgrade when possible. Augustin Mauroy

📄 Did You Know That There's an HTML Tables API? Christian Heilmann

📄 Writing Rust-Like Code in TypeScript Andrew Israel

🛠 Code & Tools

Navcat: 3D Floor-Based Pathfinding Library — It's not often we see a library with such a funny demo on the homepage (it involves cats and laser pointers!) Navcat is a pathfinding library, aimed at games and simulations, for enabling objects to route through 3D space. There are numerous other interesting demos too. GitHub repo.

Isaac Mason

Introducing ArkRegex: It's RegExp() with Types — The idea is simple: swap out the RegExp constructor or regular expression literals for this typed wrapper and get types for patterns and capture groups. Part of the ArkType project. – GitHub repo.

ArkType Project

Measure and Improve the Quality of Code Generated by LLMs — Open source tool to fine tune prompts, compare model code quality, & monitor generated quality over time.

Angular sponsor

Slim Select 3.0: An Advanced Select Dropdown Control — A feature-rich select dropdown component with no dependencies. v3.0 adds an official React component option, fixes bugs, and improves accessibility.

Brian Voelker

🤫 spoilerjs: Framework-Agnostic 'Spoiler Effects' — If you've got some text (or maybe sensitive data like a token) you want to hide on a page until someone clicks on it, this Telegram-inspired web component is for you.

shajid hasan

Gasket: CLI Tool to Discover 'Bridges' Between JavaScript and Native Code — Dynamic analysis tool that inspects the in-memory layout of JavaScript function objects to identify those that cross the language boundary. This is quite niche, but built by the authors of a paper about identifying such bridges for security purposes.

Alexopoulos and Sotiropoulos

> vue-command: A Terminal Emulator Component for Vue.js

Julian Claus

  • 📊 Recharts 3.3 – A chart library built on top of D3. The homepage has examples and demos. v3.3 gives charts the direct ability to handle responsive sizing.

  • 🦴 Cornerstone.js 4.8 – Libraries for building medical imaging apps.

  • 🔎 fuzzy-search 2.0 – Fast fuzzy search library for the frontend.

  • Immer 10.2 – Popular library for working with immutable state.

  • Dependency Cruiser 17.2 – Tool to visualize dependencies.

  • Ink 6.4 – Use React to build CLI apps.

📰 Classifieds

🔷 Build a full-featured BPMN editor in record time — use our ready-made JointJS template and focus on innovation, not implementation.

⚡ UI changes? Catch them before prod. Vizzly = local TDD + review rules for teams, not just screenshots.

📢  Elsewhere in the ecosystem

A roundup of some other interesting stories in the broader landscape:

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