WebAssembly Targets

Tish supports two WebAssembly targets:

Browser (wasm)

Produces files for browser execution:

• {output}_bg.wasm — VM binary
• {output}.js — wasm-bindgen glue
• {output}.html — Loader (open via local server for CORS)

tish compile hello.tish -o app --target wasm

Requirements: rustup target add wasm32-unknown-unknown, cargo install wasm-bindgen-cli

Serve and open in a browser:

python3 -m http.server 8765
# Visit http://localhost:8765/app.html

Wasmtime/WASI (wasi)

Produces a single .wasm file with embedded bytecode. Run with Wasmtime or any WASI-compatible runtime:

tish compile hello.tish -o app --target wasi
wasmtime app.wasm

Requirements: rustup target add wasm32-wasip1, install Wasmtime

Known limitations (WASI)

WASI output uses the bytecode VM (same runtime as Cranelift). The same subset of Tish that works with Cranelift works with WASI. Some constructs and builtins may fail or produce incomplete output. For full compatibility, prefer the Rust native backend or the JS target.

For Node.js or bundlers (no WebAssembly), use:

tish compile hello.tish -o app --target js
node app.js