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Pooya Parsa @pi0.io · 21h

* startup in “warm”

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Pooya Parsa @pi0.io · 21h

At least in upm benchmarks cold times are already one of the fastest implementations (because startup cost matters less). In cold, startup time and little mem/cpu overhead might be improved. Some have to be optimized upstream in Node.js or can be only reduced using a tiny napi extension.

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Pooya Parsa @pi0.io · 22h

upm regressed around 20kb in 1.3 🙇‍♂️ but got way faster in monorepos 😃

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The oxbox wasm build also has a few extra perf tricks! ⚡ SIMD (simd128) across the whole build 🔗 Parser and transformer optimized together (LTO) 🧵 Multithreaded async APIs with prewarmed workers

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The official packages also pull in dozens of platform bindings and a JS runtime (emnapi + napi-rs). oxbox replaces all of that with its own tiny N-API host that runs in Node.js and browsers. upm.sh/npm/oxbox upm.sh/npm/oxc-parser upm.sh/npm/@oxc-par...

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The official oxc packages ship the parser and transformer as separate binaries, and since the transformer includes its own parser, much of it is duplicated. Oxbox links both into one wasm build and embeds it compressed with 🗜️ zopfli then base93-encoded to keep it small.

Just published github.com/unjs/oxbox 🐂 🛠️ A tiny, portable JS library for parsing and transforming JS/TS/JSX, powered by oxc. ⚡ Optimized wasm build in a single JS chunk 🪞 Same API as oxc-parser + oxc-transform 🤝 Works in browsers and Node.js 💾 Fits on a floppy disk

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Pin and run the right package manager or runtime for every project.

Mise is probably a good choice! jup.unjs.io can help to manage package manager and runtime versions. It is also pure JS.

jup.unjs.io

Get started - jup

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Not currently but please open a PR, we can check if we can!

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Huge thanks to the npm and pnpm projects, whose work and ideas inspired much of upm 💛

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Every upm command is also a JS utility, and the store takes pluggable backends. The website runs a real upm install right in your browser tab and reinstall every time you reload it. Try it at upm.sh before installing anything!

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Node.js boots a few ms slower than a native binary. But on CI, size wins it back: restoring a 50–150 MB native package manager from cache takes longer than startup savings! Below you can see the measured/estimated timing.

upm uses Node.js built-ins for worker threads, networking, compression and the filesystem, and matches the speed of Rust package managers*. * Benchmarks are mainly an indicator; results vary with project, network and hardware.

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Pooya Parsa @pi0.io · 26/09/2026

Introducing 📦upm: 🪶A fast, tiny package manager for the npm registry. ✨Written in TypeScript, it installs at native-class speed and has a JS API, at a fraction of the size of native tools. 🤝Compatible with your existing .npmrc and lockfiles. 👉 Try at upm.sh

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PSA: H3 Stable and Nitro RC are imminent. Closing the last-minute gaps. Sorry for all the delays, but every single one was worth it. Nitro is becoming a MINIMAL, FAST, UNOPINIONATED/AGNOSTIC Swiss Army knife for building any web app. Your agents are gonna LOVE it.

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Pooya Parsa @pi0.io · 18/09/2026

Around a day. I guess you can use vercel AI gateway though 😄

it generates a full query like this: Docs: github.com/pithings/adv...

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if is old, jev is new!

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That’s also how i first learned about the word 😂 Tastes good with ice cream btw!

Built a tiny intuitive JS SDK for typesafe.ai Ask questions, get typed answers.

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IMO it only works (as mass adoption) if Node.js finally upstreams some of these. Which is very unlikely considering diversity of opinions…

Pin and run the right package manager or runtime for every project.

from experience, unifying efforts like corepack are very hard by nature. especially if it is driven by somehow “biased” opinions. I recently made jup.unjs.io but it is designed for the unjs ecosystem requirements + hopefully little more generic than corepack.

jup.unjs.io

Get started - jup

fwiw i have no issues with what language software is written in. runtimes managing packages make sense too. perhaps if node had it builtin everything would be simpler. pnpm managing its version, node version, python deps and actions is…

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I remember when yarn was born. It was cool and fast and fancy. then it got more complex up to a point that users couldn't keep up. Now pnpm is the star. It is getting more complex requirements to be setup "as intended" and honestly i am worried. sigh... just random thoughts.

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