I'm Hiroki.

Open Source

I’m an active open source contributor and go by @privatenumber on GitHub. My projects are available for free on npm. Last month alone, they had a total of 60 million downloads (that’s 23 downloads every second!).

Featured projects

22.2M/month

10,360

TypeScript Execute

The easiest way to run TypeScript in Node.js

151.4K/month

1,336

pkgroll

Zero-config package bundler for Node.js + TypeScript

787

pkg-size.dev

Find the true size of an npm package

1,412

minification-benchmarks

What's the best JavaScript minifier?

4.2M/month

3,584

esbuild-loader

Speed up your Webpack with esbuild

308.8K/month

207

link

npx link—a better npm link

59.5M/month

196

get-tsconfig

Lightweight tsconfig.json parser & paths resolver

181.5K/month

539

cleye

Strongly typed CLI development for Node.js

215K/month

171

type-flag

Strongly typed command-line arguments parser

60.5K/month

1,974

tasuku

The minimal task visualizer for Node.js

3.4K/month

49

fs-fixture

Simple API to create test fixtures on disk

836/month

40

manten

Lightweight async testing library for Node.js

521/month

27

lintroll

My personal code linter CLI powered by ESLint

See all npm packages →

Sponsors

I’m grateful to have been supported by these amazing GitHub sponsors. Their generosity has helped me continue building and sharing projects with the community.

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If you have benefitted from any of my projects, I’d love for you to support me!

Become a sponsor

Work

I’m currently a Senior Web Platform Engineer at Square, focused on enhancing frontend infrastructure across the company. Previously, I worked in the Square Online department on UI component libraries, seller websites, and optimizing site performance. I started my career at Weebly as a frontend engineer, where I discovered my passion for DX tooling.

Consulting

If you’re stuck on a tough engineering problem, need someone to audit a slow build, or are seeking broader guidance, I’m available to help.

I specialize in frontend tools and frameworks, with a strong focus on improving DX and infrastructure. And I love helping and connecting with people around the world. If you’re interested in working together, feel free to reach out!

Let’s connect

Feel free to connect with me on any of these platforms!