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
Specification |
---|
WebAssembly JavaScript Interface The definition of 'WebAssembly.Module()' in that specification. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Module() constructor | Chrome Full support 57 | Edge Full support 16 | Firefox
Full support
52
| IE No support No | Opera Full support 44 | Safari Full support 11 | WebView Android Full support 57 | Chrome Android Full support 57 | Firefox Android
Full support
52
| Opera Android Full support 43 | Safari iOS Full support 11 | Samsung Internet Android Full support 7.0 | nodejs Full support 8.0.0 |
Legend
- Full support
- Full support
- No support
- No support
- See implementation notes.
- See implementation notes.