unvalley
Software Engineer
I’m a software engineer based in Tokyo, writing mostly Rust and TypeScript. I’m a core contributor to Biome, and on the side I build small, focused tools. Curiosity is the key.
Rust
TypeScript
Collections
Projects
- Art4A macOS app that turns public-domain artworks into wallpapers, with curated collections across 15 art movements and daily rotation.
- rtMeta task runner CLI
- EpheEphemeral Markdown Paper
- BiomeWeb Toolchain written in Rust
- TabXChrome tab manager
- cognitoxLocal Cognito emulator
- spherCanvas layout experiment
Talks
- Native Messagingの嬉しさ雑LT
- Plugin System in Rust based JavaScript/TypeScript LintersTSKaigi 2025
- OSSと継続的に関わる方法の模索maguro.dev #1
- AIと作るEphemeral Markdown PaperFindy LT
- Thoughts and experiences on Rust and TypeScriptnagoya.ts #3
- Next generation front-end crosstalkVue Fes 2024
- Exploring Type-Informed Lint Rules in Rust based TypeScript LintersTSKaigi 2024
- Behind VS Code Extensions for JavaScript / TypeScript Linting and FormattingVSCode JP 2024
- Behind Biome | Biomeの裏側 (Parser/Linter)burikaigi 2024
- Biome is for JavaScriptersWeJS #43
- Better Unit TestingEnglish Night #13