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Detect WebAssembly Features
---

A tiny, zero-dependency library for detecting WebAssembly features (**~2 kB minified**).

## Support features

- [x] [Reference types](https://github.com/WebAssembly/reference-types) _(standardized)_
- [x] [BigInt between js and wasm](https://github.com/WebAssembly/JS-BigInt-integration) _(standardized)_
- [x] [Bulk memory operations](https://github.com/webassembly/bulk-memory-operations) _(standardized)_
- [x] [Exceptions](https://github.com/WebAssembly/exception-handling) _(--experimental-wasm-eh)_
- [x] [Memory 64-bit](https://github.com/WebAssembly/memory64) _(--experimental-wasm-memory64)_
- [x] [Custom page sizes](https://github.com/WebAssembly/custom-page-sizes)
- [x] [Mutable globals](https://github.com/WebAssembly/mutable-global) _(standardized)_
- [x] [Multi values](https://github.com/WebAssembly/multi-value) _(standardized)_
- [x] [Saturated (non-trapping) conversions from float to int](https://github.com/WebAssembly/nontrapping-float-to-int-conversions) _(standardized)_
- [x] [Sign extensions](https://github.com/WebAssembly/sign-extension-ops) _(standardized)_
- [x] [Tail calls](https://github.com/webassembly/tail-call) _(--experimental-wasm-return-call)_
- [x] [Threads](https://github.com/webassembly/threads) _(standardized)_
- [x] [SIMD](https://github.com/webassembly/simd) _(standardized)_
- [x] [Relaxed SIMD](https://github.com/WebAssembly/relaxed-simd)
- [x] [GC](https://github.com/WebAssembly/gc)
- [x] [Type reflection](https://github.com/WebAssembly/js-types) _(--experimental-wasm-type-reflection)_
- [x] [Typed function references](https://github.com/WebAssembly/function-references)
- [x] [JS String builtins](https://github.com/WebAssembly/js-string-builtins)

## Install

```
yarn add wasm-check
```

or

```
npm i wasm-check
```

## Usage

#### Check supported WebAssembly version

```ts
import * as check from 'wasm-check';
// or
// const check = require('wasm-check');

console.log(check.support());  // WebAssembly >= 1.0
console.log(check.support(1)); // ^^^
console.log(check.support(2)); // WebAssembly >= 2.0
console.log(check.support(3)); // WebAssembly >= 3.0
```

#### Check supporting streaming compilation

```ts
import * as check from 'wasm-check';

console.log(check.supportStreaming);
```

#### Get all post-MVP WebAssembly features

```ts
import * as check from 'wasm-check';

const features = { ...check.feature };
console.log(features);
```

Output:

```js
{
  bigInt: true,
  bulk: true,
  exceptions: true,
  memory64: true,
  customPageSizes: false,
  mutableGlobal: true,
  multiValue: true,
  saturateConversions: true,
  signExtensions: true,
  tailCall: true,
  threads: true,
  simd: true,
  relaxedSimd: true,
  gc: true,
  references: true,
  typeReflection: false,
  funcReferences: true,
  jsStringBuiltins: true
}
```

#### Or check concrete feature

```ts
import * as check from 'wasm-check';

console.log(check.feature.simd); // has SIMD support?
console.log(check.feature.relaxedSimd); // has Relaxed SIMD support?
console.log(check.feature.tailCall); // has tail call support?
console.log(check.feature.gc); // has Wasm GC support?
console.log(check.feature.jsStringBuiltins); // has JS String builtins support?
```