Shiro: A Complete Browser-Based Development Environment with Local Git and WASM Runtimes
By
sagebird
Pulled from the oven a few minutes early. Edible, just barely.
Summary
Shiro is a browser-based development environment that allows developers to write code, install packages, compile C programs, query databases, and run Claude Code entirely within a browser tab. The system uses IndexedDB for file persistence and WASM runtimes that load on demand, ensuring that no data leaves the user's machine unless explicitly intended. It includes real git functionality running client-side via isomorphic-git, supports 220+ commands in a compact ~420KB package, and requires no server infrastructure.
Key quotes
· 4 pulledWrite code, install packages, compile C, query databases, and run Claude Code — all in a browser tab.
Files persist in IndexedDB. WASM runtimes load on demand. Nothing leaves your machine unless you want it to.
Real git, no server: init, add, commit, diff — all running client-side via isomorphic-git.
220+ commands in ~420 KB. 2250+ tests. No server required.
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