Wado

Wado is a programming language built from the ground up for WebAssembly. It draws syntax and type system ideas from Rust but compiles exclusively to the WebAssembly Component Model and WASI 0.3+. The result is a language that feels familiar to anyone who has written Rust or TypeScript but produces small, portable Wasm modules without a bundled runtime.

The project tackles a specific frustration in the Wasm ecosystem. General purpose languages like Rust or C++ can target WebAssembly, but they drag along runtime machinery and produce binaries larger than they need to be. Wado takes the opposite approach by designing every feature around what WebAssembly actually supports. It uses Wasm GC for garbage collection so modules carry no runtime overhead, keeps the type system aligned with the Component Model, and makes WASI capabilities explicit in function signatures. What you write is close to what ships.

Under the hood, Wado is statically typed with generics, closures, pattern matching, and a trait system. Errors are values through Result and Option types rather than exceptions. There are no macros, no implicit conversions, and no hidden control flow. The language spec calls this predictable design, and it shows in how readable the compiled output tends to be. For debugging, that transparency matters.

One unusual piece of context is the development story. The compiler was written entirely by AI coding agents, a claim the maintainers highlight on the site and in the repository. That makes Wado an interesting test case for agent assisted tooling as much as a practical language. The legible syntax was chosen partly so that future agents could work in it easily, and the project documentation is explicit about that intent.

Tooling includes a browser based playground that compiles and runs code without installing anything, a VS Code extension with language server support, and pre built binaries for Linux, macOS, and Windows. The playground requires Chrome or Chromium 137+ because it relies on JavaScript Promise Integration, a relatively new browser capability. For local work, you can install via a curl command or build from source with Cargo.

Wado is open source under the MIT license. The repository is active, with documentation covering the language spec, a cheatsheet for common patterns, and performance dashboards. The audience is developers embedding small, type safe Wasm modules into browsers, edge runtimes, or plugin systems where binary size and predictability outweigh the ecosystem maturity of established languages. It is still experimental, and the maintainers are clear about that, but the core feature set works and the community is growing around it.