A
WebAssembly.Module
object contains stateless WebAssembly code that has already been compiled by the browser and can be efficiently shared with Workers, and instantiated multiple times. To instantiate the module, call the secondary overload of WebAssembly.instantiate()
.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()
.Constructor 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.
var myModule = new WebAssembly.Module(bufferSource);
Parameters
- bufferSource
- A typed array or ArrayBuffer containing the binary code of the .wasm module you want to compile.
Function Properties of the Module
Constructor
WebAssembly.Module.customSections()
- Given a
Module
and string, returns a copy of the contents of all custom sections in the module with the given string name. WebAssembly.Module.exports()
- Given a
Module
, returns an array containing descriptions of all the declared exports. WebAssembly.Module.imports()
- Given a
Module
, returns an array containing descriptions of all the declared imports.
Module
instances
All Module
instances inherit from the Module()
constructor's prototype object — this can be modified to affect all Module
instances.
Instance properties
Module.prototype.constructor
- Returns the function that created this object's instance. By default this is the
WebAssembly.Module()
constructor. Module.prototype[@@toStringTag]
- The initial value of the @@toStringTag property is the String value "WebAssembly.Module".
Instance methods
Module instances have no default methods of their own.
Specifications
Specification | Status | Comment |
---|---|---|
WebAssembly JavaScript Interface The definition of 'WebAssembly.Module()' in that specification. |
Working Draft | Initial draft definition. |
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.
Update compatibility data on GitHub
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Module | 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 ? | Safari iOS Full support 11 | Samsung Internet Android Full support 7.0 | nodejs Full support 8.0.0 |
customSections | 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 ? | Safari iOS Full support 11 | Samsung Internet Android Full support 7.0 | nodejs Full support 8.0.0 |
exports | 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 ? | Safari iOS Full support 11 | Samsung Internet Android Full support 7.0 | nodejs Full support 8.0.0 |
imports | 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 ? | Safari iOS Full support 11 | Samsung Internet Android Full support 7.0 | nodejs Full support 8.0.0 |
prototype | 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 ? | 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
- Compatibility unknown
- Compatibility unknown
- See implementation notes.
- See implementation notes.