WebAssembly.module

A WebAssembly.Module object contains stateless WebAssembly code that has already been compiled by the browser and can be efficiently shared with Workers, cached in IndexedDB 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() or by reading a Module out of IndexedDB.

Constructor Syntax

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

Browser compatibility

See also

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