TROUBLESHOOTING.md

Troubleshooting log

Hello world setup

Very helpful debug journal of a TinyGo<>WASM setup

JS console error Uncaught (in promise) TypeError: WebAssembly.instantiate(): Import #0 module="env" error: module is not an object or function A: Try copying wasm_exec.js from your version of golang/tinygo: cp $(go env GOROOT)/misc/wasm/wasm_exec.js . or wget https://raw.githubusercontent.com/tinygo-org/tinygo/master/targets/wasm_exec.js

via marianogappa blog: Do you definitely have the version of wasm_exec.js that matches the version of go or tinygo with which you built the WASM file?

cp $(tinygo env TINYGOROOT)/targets/wasm_exec.js .

Unable to run a server.go that imports net? See stdlib packages supported by TinyGo.

JS console error Uncaught (in promise) TypeError: WebAssembly.instantiate(): Import #0 module="wasi_snapshot_preview1" error: module is not an object or function Missing wasi_snapshot_preview1 indicates a compilation/environment issues

Presumably looking for [wasm-tool/wasi](https://github.com/wasm-tool/wasi).

npm init
npm install --save-dev @wasm-tool/wasi

Later realized this wasn't necessary. Probably grabbing the TinyGo specific version of wasm_exec.js that fixed it.

As someone who hates frontend bundling overhead, is there a way to use npm modules without webpack or a similarly heavy bundler system?

"A Future Without Webpack" | pika.dev: Snowpack.dev - lightweight build tool that leverages ESM (JS's native module system)

npm install --save-dev snowpack

exporting functions between JS and Go

As per this TinyGo <> WASM example

Import #2 module="env" function="syscall/js.valueGet" error: function import requires a callable