Hoi hoi! 👋

Last week, we launched the Necoz organization here on DEV!

Necoz Follow

Necoz is a friendly open-source community building small, simple, and useful tools for developers. 🐈 Everyone is welcome, from first-time contributors to experienced engineers. Let's build something awesome together! 😸

And guess what?

28 cats have already joined us!!! 🙀🎉

YAYYYYY!!! 💚

A huge thank you to everyone who joined!

Apparently, DEV only allows up to 10 mentions per article, so I've listed everyone using profile links instead. 🙀💚

But now that we've captured all these cats,

Where are we going to take them? 👀

Hehehe... We're building something behind the scenes. Stay tuned! 🐈🛸

🏆 New Contributors, Good Cats 😺😺😺

This week, we've had some awesome contributors joining our projects!

GOOD CATS!!! 😻🎉

Since this is our first weekly report, we're also celebrating everyone who contributed before this week!

So far, 34 amazing cats have contributed 70 merged pull requests across our projects! 🐈🎉

🧩 is-kit

necoz-oss / is-kit

Build small guards. Compose them. A lightweight, zero-dependency toolkit for building reusable TypeScript type guards that compose, refine, and preserve natural narrowing. Runtime-safe 🛡️, composable 🧩, and ergonomic ✨.

is-kit

Build small guards. Compose them.

is-kit is a lightweight, zero-dependency toolkit for building reusable TypeScript type guards.

is-kit is not just a collection of isX helpers. Its main focus is composing small runtime checks into reusable guards while preserving useful TypeScript narrowing.

It helps you write small isFoo functions, compose them into richer runtime checks, refine properties on values you already know about, and keep TypeScript narrowing natural inside regular control flow. Use it at runtime boundaries when needed, without requiring a schema-first workflow.

Runtime-safe 🛡️, composable 🧩, and ergonomic ✨ without asking you to adopt a heavy schema workflow.

Build and reuse typed guards
Compose guards with and, or, not, oneOf
Use refineKey to narrow a child property while preserving its parent type
Validate object shapes and collections when that is useful
Parse or assert unknown values without a large schema framework

Best…

View on GitHub

Aaqibhafeezkhan — Improved oneOf evaluation and short-circuit tests. (#385)
AmirAbaris — Strengthened refineKey type-level tests. (#372)
BoteroAlejandro11 — Improved mapOf short-circuit tests. (#416)
Doomguy-BFG9000 — Improved lazy predicate caching tests. (#392)
GyulianoDev — Improved array guard short-circuit tests. (#414)
Pratham2511 — Expanded sparse array and parsing edge-case coverage. (#393, #384)
crims0n — Improved predicateToRefine test coverage. (#386)
diyaryavuz — Expanded refinement and tupleOf edge-case tests. (#397, #377)
guhcostan — Improved safeParse documentation. (#370)
nuriadevs — Clarified isNumber documentation. (#371)
painbaba — Fixed literal narrowing behavior in oneOfValues. (#400)
psjdeveloper — Improved define predicate coverage. (#394)
saimskywalker — Fixed an edge case in isPlainObject. (#406)
srijavuppala — Strengthened assert runtime guard tests. (#417)
tridev-tej — Improved safeJsonParse error propagation tests. (#431)
tylrcc — Improved runtime guard tests and compatibility documentation. (#426, #425, #424, #423, #422)

🤖 changelog-bot

necoz-oss / changelog-bot

Automatic create changelog with AI. 🤖 It provides CLI and github actions. 🚀 https://www.npmjs.com/package/@nyaomaru/changelog-bot

Releases should feel exciting, not tedious.

@nyaomaru/changelog-bot 🤖 turns your Git history and release notes into a polished changelog entry (and optional PR) in a single run. Drop it into CI, run it locally, or hand it to your release captain—either way, you ship with a crisp changelog and zero copy-paste fatigue.

The GitHub repository is necoz-oss/changelog-bot. The npm package name is still @nyaomaru/changelog-bot. In workflows, use necoz-oss/changelog-bot. GitHub Actions does not follow repository redirects for actions or reusable workflows, so keep uses: on the new owner. Web and git URLs for nyaomaru/changelog-bot still redirect.

Why changelog-bot?

Automated storytelling: Combines commit history, PR titles, and release notes to produce human-ready changelog sections.
LLM superpowers (optional): Connect OpenAI or Anthropic for tone-aware summaries or skip API keys entirely and rely on a robust heuristic fallback.
PR-ready output: Can open a pull request with updated changelog, compare links, and…

View on GitHub

19algorythms — Added a Jest coverage script. (#299)
Anantha-K — Fixed release version handling during changelog generation. (#251)
GyulianoDev — Improved CLI error messages. (#307)
KingEmma7 — Improved runtime validation using shared guards. (#265)
Mayank-jaiswal13 — Refactored PR lookup logic and improved test maintainability. (#327, #306)
MayurK-cmd — Expanded compare link generation tests. (#326)
Prashaxt — Added JSON schema support and improved GitHub API tests. (#288, #274)
Satorino01 — Expanded test coverage for repeated compare link updates. (#348)
WebWizard5243 — Reduced duplication in metadata diagnostics. (#325)
dbdefault — Simplified runtime validation using is-kit predicates, fixed PR linking inside fenced code blocks, and expanded title lookup and metadata fallback test coverage. (#352, #351, #349, #345, #342)
enidchen0125 — Improved repository configuration validation. (#339)
erSpell — Improved WHY extractor test coverage. (#276)
jay23606 — Improved changelog file error handling. (#272)
johnnylemonny — Contributed extensively to WHY extraction, evaluation, GitHub metadata handling, output delivery, Grok support, security, cross-platform compatibility, and much more! (View contributions)
mangomac — Expanded release Markdown test coverage. (#275)
noahkhomer18 — Fixed duplicate changelog bullet handling. (#324)
sorathiya903 — Added practical output destination examples. (#309)
tylrcc — Reduced code duplication across metadata, changelog utilities, and diagnostics. (#318, #317, #316)
xryanlee — Improved documentation on how to claim an issue. (#330)

🦀 type-tune

necoz-oss / type-tune

A Rust-powered CLI to find shared TypeScript types and move them safely. 🦀

type-tune

Give shared TypeScript types a better home. 😸

Scan. Review. Move. Validate.

type-tune is a Rust-powered CLI that finds shared TypeScript type aliases and interface declarations and helps move them without manually chasing imports.

It creates a reviewable plan, updates supported type imports and re-exports, and validates the rewrite with TypeScript. You decide what moves and where.

Guides for installation, the first scan, and the review workflow live in the official documentation. Releases are listed on GitHub Releases, and the package is type-tune on npm.

Why type-tune?

Types often start next to a component or utility, then end up shared across a project. Moving them later means tracking imports, local dependencies, and barrels by hand.

Discover shared types with deterministic candidate IDs.
Review plan.md and choose the destination before making changes.
Rewrite supported type-only imports, aliases, and simple barrels while keeping compatibility re-exports at the original…

View on GitHub

ViviBeri — Improved test coverage for aliased mixed imports through barrel re-exports. (#23)

Thank you so much for your contributions! 💚

Remember, no contribution is too small!

Code, tests, documentation, bug reports, ideas, or even a simple question. Everything is welcome!

🚀 From Discussion to Creation

One of our recent community discussions has already turned into a new open-source project called safe-paste! 🎉

necoz-oss / safe-paste

A lightweight, local-first browser extension for sensitive information before sharing. 😺🔎

safepaste

A lightweight, local-first browser extension for sensitive information before sharing. 😺🔎

View on GitHub

It's a little tool designed to help prevent accidentally pasting sensitive information.

We're still in the early stages of development, so if you're interested, feel free to jump in and help us build it together! 🐾

You're also more than welcome to start your own discussions, share ideas, suggest new projects, or just chat with other cats!

👉 https://github.com/orgs/necoz-oss/discussions

Who knows? Your little idea might become our next open-source project! 👀

Don't be shy! We're friendly cats. Probably. 😼

👑 Cat of the Necoz

And our very first Cat of the Necoz is

🥁 Drumroll, please...

🐈 @johnnylemonny

johnnylemonny (John) · GitHub

Full‑stack developer creating fast, modern, and refined applications. I focus on simplicity, performance, and real value for users. Open to opportunities. - johnnylemonny

github.com

John has made an incredible number of contributions to changelog-bot, helping us improve everything from new features to testing, reliability, and security.

Thank you for all your amazing work, John!

You are officially a SUPER CAT!!! 😻👑🎉

Who will be our next Cat of the Necoz? 👀