A toy language that compiles to WebAssembly binary format, written in TypeScript.

Wats uses a simple syntax with functions declared using funk:

funk add(x, y) { x + y }

funk main() {
  let result = add(1, 2);
  result
}

Supports arithmetic (+, -, *, /), let bindings, variable assignment (:=), and function calls.

# Run the REPL
npm run repl

# Run tests
bun test

# Type check
npm run check

• src/wasm/ — Low-level WebAssembly binary encoding (LEB128, instructions, sections, module builder)
• src/compiler/ — Language frontend: Ohm.js PEG grammar, semantic actions, and compiler
• src/runtime/ — WebAssembly module loader
• test/ — Tests (mirrors src/ structure)