What Causes and How to Resolve Golang to WASM Compilation Errors?

Golang to WASM Compilation Errors and Solutions

Compiling Go code to WebAssembly (WASM) using the command GOOS=js GOARCH=wasm go build -o main.wasm can result in errors when executing with wasmtime and wasm3.

Error with wasmtime:

Error: failed to run main module `main.wasm`

Caused by:
    0: failed to instantiate "main.wasm"
    1: unknown import: `go::debug` has not been defined

Error with wasm3:

Error: function lookup failed ('_start')

Meaning of Errors:

• wasmtime error: The error indicates that the main.wasm module cannot be instantiated because the WebAssembly module imports a function named go::debug that is not defined in the module.
• wasm3 error: The error signifies that the WebAssembly module lacks the required _start function, which is the entry point for the module.

Fixing the Errors:

The following solutions can resolve these errors:

1. Use Node.js with wasm_exec.js:

   • Run the following command:

     node wasm_exec.js main.wasm

2. Compile with Tinygo (with WASI support):

   • Use the following command:

     tinygo build -target=wasi -o main.wasm main.go

   This will create a WASM module that can be run with wasmtime.

3. Enable experimental WASM support in Go:

   • Compile Go from source using the following commands:

     go install golang.org/dl/gotip@latest
     gotip download

   • Then, use the following command to compile to WASM:

     GOOS=wasip1 GOARCH=wasm gotip build -o main.wasm

   This will enable experimental support for WASM in Go, allowing you to run the module directly with wasmtime.

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