uvwasi ☆

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Description:
WASI syscall API built atop libuv

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: wasi webassembly libuv system-interface nodejs

Install: brew install uvwasi

About:
Uvwasi provides an implementation of the WebAssembly System Interface (WASI) syscall API built on top of the libuv library. It enables WebAssembly runtimes to interact with the host operating system's file system, network, and other system resources. This library is primarily used within the Node.js runtime to support WASI modules.

Key Features:

Provides a POSIX-like API for WebAssembly
Built on the cross-platform libuv event loop
Enables file system and system call access for WASM
Designed for integration into WebAssembly runtimes

Use Cases:

Enabling WASI support in Node.js
Building custom WebAssembly runtimes with system access
Developing host environments for sandboxed applications

Alternatives:

wasmtime – A standalone runtime with its own sandboxed execution environment, whereas uvwasi is a library intended to be embedded.
wasi-libc – Provides a standard C library implementation for WASI, often used with Emscripten, while uvwasi focuses on the libuv integration layer.

Version History

Detected	Version	Rev	Change	Commit
Sep 13, 2025 7:54am		0	VERSION_BUMP	91ee0f5a
Sep 10, 2025 9:52pm		0	VERSION_BUMP	c1cc0c86