# WASI

Build a C++26 program for the `wasm32-wasi` target and run it in a browser.

## Prerequisites

- `wasi-libc`, `wasi-libc++`, `wasi-libc++abi` (Arch packages — provide
  `/usr/share/wasi-sysroot/`, which `crafter-build` finds automatically).
  Other distros: install the WASI SDK and set `cfg.sysroot` in `project.cpp`.

## Build

```bash
crafter-build
```

Output lands in `bin/wasi-hello-wasm32-wasip1-native/`:

- `wasi-hello.wasm` — the compiled module
- `index.html` + `runtime.js` — a minimal in-browser WASI shim, dropped in by
  `EnableWasiBrowserRuntime(cfg)` in `project.cpp`. Stdout goes to the browser
  console.

## Run in a browser

```bash
./serve.sh                  # any static file server works
```

Open `http://localhost:8080/`. The string from `main()` shows up in the
DevTools console.

## Run in a standalone runtime

If you don't need the browser, drop the `EnableWasiBrowserRuntime(cfg)` line
from `project.cpp` and run the `.wasm` directly:

```bash
wasmtime bin/wasi-hello-wasm32-wasip1-native/wasi-hello.wasm
```