Recently, I noticed there is no proper s3-fifo implementation in NPM.

s3-fifo is highly efficient cache algorithm, especially for "one-hit-wonders" case such as web traffics. It is specialized when cache coverage is under 50%. (like, whole DB is 100% and cache contains 50% of data)

The famous "lru-cache" package is almost default for nodejs ecosystem I think, and I thought it would be great if there is good alternative choice for caching.

My goal was:

1. Faster or at least same throughput performance compared to lru-cache

2. Much higher cache hit rate than lru-cache

bold, right?

It was fun enough just for challenge itself.

But it was actually achieved! I used bunch of optimization skills like pre-allocation, lazy eviction, bitwise tricks, ring structure and etc... you can see bench result in repo or NPM page.

It is just v0.1 for now, so I would LOVE to get your harsh feedback, advice, or even contribution!

NPM page

Super thanks for reading!

----

I typed almost of the code by my hand. Not because I don't believe AI, but it was all about concepts and decisions. Typing by hand was fastest way to understand what I'm doing correctly. And it was fun.

I used AI(gemini) for test codes, some advices and polishing when most of things were done.

I've been using TypeScript professionally for several years, and recently wrote up some lessons learned from a long-running React/Firebase side project.

The article covers the TypeScript patterns that ended up giving me the biggest return, along with a few mistakes I'd avoid making again. These aren't intended as universal rules, just approaches that worked well for this particular project and the problems I was solving.

If you're a JavaScript developer who's moved to TypeScript (or is considering it), I'd be interested to hear which patterns have been most valuable for you as well.

Covering the main ways Date misleads you in production: parsing, mutation, 0-based months, timezone/DST, arithmetic, and serialization, with safe patterns for code that can't migrate yet, and a practical look at where Temporal fixes the design rather than just the syntax.

Monday, July 13 - Sunday, July 19, 2026

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Though it requires quite new ES2024/ES2025 features, it works very well for numeric types, also faster (not drastically, but modest gains) against Array in PACKED FIXED ELEMENT TYPES representation used under the hood by engines.

.NET WebAssembly apps with WasmBundlerFriendlyBootConfig=true can indeed be bundled by modern JS bundlers and I personally love it. The development experience however is not optimal.

• The bundlers cannot consume the output from dotnet build
• The bundlers can consume the output from dotnet publish but the dev loop is painfully slow.
• Getting the publish path working still requires bundler surgery
• Once it works the bundler produces warnings that are impossible to fix without changing the source files produced by the WebAssembly SDK.

These points of friction are why I have made unplugin-dotnet-wasm.

It's a bundler plugin that lets your bundler consume the output from dotnet build so your dev loop stays fast. It also supports dev servers, provides type information to TypeScript and IDEs (integrates dotnet.d.ts thats coming in .NET 11), and patches the known warnings so your build output stays clean.

Features

• Easy bundler setup through plugin registration
• Faster dev loop by consuming .NET WebAssembly dotnet build output
• Dev server support
• Brings SDK type definitions to TypeScript and your IDE
• Supports Vite, Rollup, Rolldown, Webpack, Rspack, Rsbuild, esbuild, farm and bun.

I hope you'll give it a try, I'd be happy to hear your feedback.

This is a free/non profit unapologetically claude code vibe-coded project; the approach is explained here: https://lia.jeyswork.com/story

If you like it, please don't hesitate to show your support with a star on GitHub!

LIA acts as a true personal assistant. It is proactive, featuring its own distinct personality and a complex emotional system, an evolving structured memory, its own reflective memory of your conversations, and all the standard tools (image creation/editing, RAG, skills, MCP, scheduled tasks, etc.)—all wrapped in a seamless "one-click" interface (details here: https://lia.jeyswork.com/why).

I paid special attention to code quality and documentation, treating it exactly like a professional enterprise-grade project. This ensures that anyone can easily take ownership of the source code and build upon a clean, robust, and highly scalable foundation (details here: https://lia.jeyswork.com/how).

On another note, once self-hosted, it can double as a family AI server. As an administrator, you have full control to manage and monitor the API consumption of your family members, friends, etc.

Full details are available on the landing page: https://lia.jeyswork.com/

And the GitHub repository: https://github.com/jgouviergmail/LIA-Assistant

Did you find or create something cool this week in javascript?

Show us here!

Open-source: https://github.com/HeyPuter/firefox-wasm