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

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

See also

• WebAssembly overview page
• WebAssembly concepts
• Using the WebAssembly JavaScript API