WebAssembly.Module() constructor

A WebAssembly.Module() constructor creates a new Module object containing stateless WebAssembly code that has already been compiled by the browser and can be efficiently shared with Workers, and instantiated multiple times.

The WebAssembly.Module() constructor function can be called to synchronously compile given WebAssembly binary code. However, the primary way to get a Module is through an asynchronous compilation function like WebAssembly.compile().

Syntax

Warning: Since compilation for large modules can be expensive, developers should only use the Module() constructor when synchronous compilation is absolutely required; the asynchronous WebAssembly.compileStreaming() method should be used at all other times.

new WebAssembly.Module(bufferSource)

Parameters

bufferSource

A typed array or ArrayBuffer containing the binary code of the .wasm module you want to compile.

Examples

Synchronously compiling a WebAssembly module

var importObject = {
  imports: {
    imported_func: function(arg) {
      console.log(arg);
    }
  }
};

function createWasmModule(bytes) {
  return new WebAssembly.Module(bytes);
}

fetch('simple.wasm').then(response =>
  response.arrayBuffer()
).then(bytes => {
  let mod = createWasmModule(bytes);
  WebAssembly.instantiate(mod, importObject)
  .then(result =>
     result.exports.exported_func()
  );
})

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
Module
57
16
52
Disabled in the Firefox 52 Extended Support Release (ESR).
No
44
11
57
57
52
Disabled in the Firefox 52 Extended Support Release (ESR).
43
11
7.0

See also

© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Module/Module