wasmexec

wasmexec

For applications that need to provide the correct wasm_exec.js based on a go runtime version.

Rationale

The $GOROOT/misc/wasm/wasm_exec.js file is included in the go installation but is only accessible from the filesystem.

This module provides a means to source the correct wasm_exec.js content programmatically.

The golang source repository is scanned nightly, and the current tags in the repository are mapped to the correct content at misc/wasm/wasm_exec.js.

For go1.24 or later, the path lib/wasm/wasm_exec.js is also checked.

Example

package main

import (
	"github.com/mlctrez/wasmexec"
	"net/http"
)

func main() {
	// an example for a wasm_exec.js based on the go runtime version
	http.HandleFunc("/wasm_exec.js", func(writer http.ResponseWriter, request *http.Request) {
		content, err := wasmexec.Current()
		if err != nil {
			writer.WriteHeader(http.StatusInternalServerError)
			return
		}
		writer.Header().Set("Content-Type", "application/javascript")
		_, _ = writer.Write(content)
	})
}

created by tigwen