W3cubDocs

/JavaScript

WebAssembly.module.Module

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

Important: 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 compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Module() constructor 57 16 52
52
Disabled in the Firefox 52 Extended Support Release (ESR).
No 44 11
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Module() constructor 57 57 52
52
Disabled in the Firefox 52 Extended Support Release (ESR).
43 11 7.0
Server
Node.js
Module() constructor 8.0.0

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Module/Module