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Practical WebAssembly

The wasm2js Tool

Explore how to use the wasm2js tool from Binaryen to convert WebAssembly text formats into efficient asm.js JavaScript. This lesson helps you generate faster JavaScript modules that serve as polyfills for browsers lacking native WebAssembly support, improving compatibility and performance.

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Conversion from wasm to Js

The wasm2js tool converts WASM/WAST files into JavaScript files. Let’s look at the steps:

  1. Create a file called add-with-export.wast:

Shell
touch add-with-export.wast

Then, add the following code:

C++
(module
    (export "add" (func $add))
    (func $add (param $x i32) (param $y i32) (result i32)
        (i32.add
            (local.get $x)
            (local.get $y)
        )
    )
)
...