go_wasm_tools

This is a page for tools for go running in wasm

Building

To build the wasm file run:

GOOS=js GOARCH=wasm go build -o main.wasm

Notes

wasm_exec.js

In order use wasm in Go you need Go's wasm_exec.js file.

This repo is uses jsDeliver as a CDN from the Go repo to get that file with this HTML header:

<script src="https://cdn.jsdelivr.net/gh/golang/go@go1.22.5/misc/wasm/wasm_exec.js"></script>

To copy the file from your computer's Go install to your current directory use this command:

cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" .

Making Go functions avaliable from Javascript

The way to expose Go functions to the Javascript is by importing syscall/js and calling js.Global().Set with a js.FuncOf wrapper around your Go function. The name given in .Set will be what is available in the Javascript.

Long Running

Go by default ends execution as soon as the main function completes. If you want the functions to be available you will have to keep the main function alive. I do this by having a channel at the end of main:

<-make(chan bool)

References

https://golangbot.com/webassembly-using-go/

https://codepo8.github.io/css-fork-on-github-ribbon/