The WebAssembly.Module.exports()
function returns an array containing descriptions of all the declared exports of the given Module
.
Syntax
WebAssembly.Module.exports(module);
Parameters
- module
- A
WebAssembly.Module
object.
Return value
An array containing objects representing the exported functions of the given module.
Exceptions
If module is not a WebAssembly.Module
object instance, a TypeError
is thrown.
Examples
Using exports
The following example (see our index-compile.html demo on GitHub, and view it live also) compiles the loaded simple.wasm byte code using the WebAssembly.compileStreaming()
method and then sends it to a worker using postMessage().
var worker = new Worker("wasm_worker.js"); WebAssembly.compileStreaming(fetch('simple.wasm')) .then(mod => worker.postMessage(mod) );
In the worker (see wasm_worker.js
) we define an import object for the module to use, then set up an event handler to receive the module from the main thread. when the module is received, we create an instance from it using the WebAssembly.Instantiate()
method, invoke an exported function from inside it, then show how we can return information on the available exports on a module using WebAssembly.Module.exports
.
var importObject = { imports: { imported_func: function(arg) { console.log(arg); } } }; onmessage = function(e) { console.log('module received from main thread'); var mod = e.data; WebAssembly.instantiate(mod, importObject).then(function(instance) { instance.exports.exported_func(); }); var exports = WebAssembly.Module.exports(mod); console.log(exports[0]); };
The exports[0]
output looks like this:
{ name: "exported_func", kind: "function" }
Specifications
Specification |
---|
WebAssembly JavaScript Interface The definition of 'exports()' in that specification. |
Browser compatibility
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 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.