Bare minimum wasm text compiler/formatter. A light & fast alternative to wat2wasm.
Useful for hi-level languages or dynamic (in-browser) compilation.
| Size (gzipped) | Performance (op/s) | |
|---|---|---|
| watr | 3.8 kb | 6000 |
| wat-compiler | 6 kb | 348 |
| wabt | 300 kb | 574 |
Compile wasm text or syntax tree into wasm binary.
import compile from 'watr' // or `import { compile } from 'watr'`
const buffer = compile(`(func (export "double")
(param f64) (result f64)
(f64.mul (local.get 0) (f64.const 2))
)`)
const module = new WebAssembly.Module(buffer)
const instance = new WebAssembly.Instance(module)
const {double} = instance.exports
double(108) // 216Format input wasm text or syntax tree into minified or pretty form.
import { print } from 'watr'
const src = `(func (export "double")
(param f64) (result f64)
(f64.mul (local.get 0) (f64.const 2))
)`
// pretty-print (default)
print(src, {
indent: ' ',
newline: '\n',
})
// (func (export "double")
// (param f64) (result f64)
// (f64.mul
// (local.get 0)
// (f64.const 2)))
// minify
print(src, {
indent: false,
newline: false
})
// (func (export "double")(param f64)(result f64)(f64.mul (local.get 0)(f64.const 2)))Parse input wasm text into syntax tree.
import { parse } from 'watr'
parse(`(func (export "double") (param f64) (result f64) (f64.mul (local.get 0) (f64.const 2)))`)
// [
// 'func', ['export', '"double"'], ['param', 'f64'], ['result', 'f64'],
// ['f64.mul', ['local.get', 0], ['f64.const', 2]]
// ]- [x] wasm core
- [x] multi-value
- [x] bulk memory ops
- [x] simd
- [ ] multiple memories
- [ ] func refs
- [ ] gc
- watlings – learn Wasm text by examples.
- MDN: control flow
- WASM reference manual
- WASM binary encoding