How to Export All Desired Functions When Compiling a Go Program to WASM?

Exporting Functions in Go WASM

Problem:

When compiling a Go program to WASM, only a subset of the exported functions are retained. This can be problematic if you need to access specific functions from JavaScript.

Question:

How can we export all the desired functions while compiling a Go program to WASM?

Answer:

Using TinyGo:

If you plan to focus on WASM development, consider using TinyGo. TinyGo provides a //export comment directive that allows you to specify which functions should be exported.

<code class="go">// This function is exported to JavaScript, so can be called using
// exports.multiply() in JavaScript.
//export multiply
func multiply(x, y int) int {
    return x * y;
}</code>

Using the Standard Go Compiler (Experimental):

The standard Go compiler has an ongoing discussion about replicating TinyGo's export feature. One potential solution is to set functions to the JS global namespace using js.Global().Set(...).

Example:

<code class="go">package main

import (
    "github.com/gopherjs/gopherjs/js"
)

func main() {
    js.Global().Set("MyFunc", MyFunc)
}

func MyFunc() {
    fmt.Println("MyFunc called from JavaScript")
}</code>

Compilation:

Compile the Go program to WASM using the following command:

<code class="sh">GOOS=js GOARCH=wasm go build -o main.wasm main.go</code>

This should export the MyFunc function and make it accessible to JavaScript.

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