GC and Exceptions in Wasmtime
The Wasm GC and exceptions proposals are both enabled by default in today’s Wasmtime 47 release! We are excited to help bring more languages to WebAssembly and everywhere that Wasmtime runs. Getting to this point involved large Wasmtime changes and represents the culmination of years of engineering effort. Wasmtime Wasmtime is a WebAssembly runtime that is fast, safe, and portable. It is standalon
WASI 0.3 Launched
WASI 0.3 is official, and async is now native to WebAssembly Components. The WASI Subgroup voted to ratify WASI 0.3.0, rebasing WASI onto the WebAssembly Component Model’s async primitives. The 0.3.0 specification is now stable, and runtime and toolchain support is landing now. The work that wasi:io in WASI 0.2 used to do (pollables, input-streams, output-streams) is now part of the canonical ABI,
The Road to Component Model 1.0
WASI P3 is almost here, bringing native async support to the WebAssembly System Interface (WASI) and Component Model. In this post, we’re looking to the next big milestone: a stable, formally specified Component Model 1.0. At February’s Bytecode Alliance Plumbers Summit, Luke Wagner and Alex Crichton gave a preview of what the path to a stable 1.0 actually looks like. At Wasm I/O 2026 in Barcelona
Rust(Yew) vs JavaScript(React) — マンデルブロ集合で実測したWebAssemblyのリアルな速度差
はじめに こんにちは！株式会社ミラボでエンジニアとして働いている 梅澤 です。 「WebAssembly は速い」「Rust + WASM ならフロントエンドのパフォーマンス問題は解決」——そんな話を一度は聞いたことがあるのではないでしょうか。私もその一人で、実際に手を動かして確かめてみたくなりました。 そこで、フラクタル図形の代表であるマンデルブロ集合を題材に、React + JavaScript と Yew + Rust(WebAssembly) で同じ仕様のアプリを作り、Web Worker × 4 の並列計算で公平に性能比較してみました。 結論を先に言うと、想定通りには行きませんでした。 むしろ、その「想定外」こそが本記事の核になります。 ❌「Rust + WASM は JS より圧倒的に速い」とは限らない ✅ 同じ条件で比較すると 10〜20% 程度の差 に落ち着く 🪤 そして
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GitHub - vercel-labs/fx: Unix like coding agent
Table flip: a wasm2c guest runs a shell command on the host, through one unchecked calloc
GitHub - doodlewind/mocha1995: ☕️ The world's first JavaScript engine written in 1995 by Brendan Eich, now compiled back to JS and WASM!
GitHub - michaelkremenetsky/valkey-wasm: Real Valkey (BSD Redis fork) compiled to WASM, networking bridged to node:net — an in-process, Redis-compatible server for Node. PGlite for Redis.
GitHub - rivet-dev/agentos: Give agents an operating system as a library. Runs in your existing backend – no sandboxes, VMs, or SaaS. Powered by WebAssembly & V8 isolates.
GitHub - LocalMode-AI/LocalMode: Local-first AI toolkit for the modern web. Build privacy-first AI applications that work entirely in the browser.
GitHub - soycaporal/ternlight
GitHub - nasa/spacewasm: A flight-compliant WebAssembly interpreter.
js2wasm — AOT JavaScript/TypeScript → WebAssembly GC
GitHub - Altor-lab/altor-vec: Client-side vector search powered by HNSW. 54KB gzipped WASM. Sub-millisecond latency.
GitHub - ofalkenberg/zig-wasi-components: Complete support for WASI components for Zig / wasi 0.2 / wasi 0.3
Endive and the Next Chapter of WebAssembly on the JVM
GitHub - kaznak/wasm-spec-ja: wasmspec の日本語訳
GitHub - kelnishi/LLM-on-WASM: Demonstrates running Large Language Models on WebAssembly WASI-NN using the WACS runtime.
An iOS-optimized Linux x86 container | MeoKit Blog
GitHub - goccy/wasmify