WebAssembly.Instance.prototype.exports
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since October 2017.
The exports read-only property of the
WebAssembly.Instance object prototype returns an object containing as its
members all the functions exported from the WebAssembly module instance, to allow them
to be accessed and used by JavaScript.
Examples
Using exports
After fetching some WebAssembly bytecode using fetch, we compile and instantiate the
module using the WebAssembly.instantiateStreaming() function, importing a
JavaScript function into the WebAssembly Module in the process. We then call an Exported WebAssembly function
that is exported by the Instance.
const importObject = {
my_namespace: {
imported_func(arg) {
console.log(arg);
},
},
};
WebAssembly.instantiateStreaming(fetch("simple.wasm"), importObject).then(
(obj) => obj.instance.exports.exported_func(),
);
Note: You can also find this example as instantiate-streaming.html on GitHub (view it live also).
Specifications
| Specification |
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| WebAssembly JavaScript Interface # dom-instance-exports |
Browser compatibility
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Legend
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- Full support
- Full support