add WASM blazor-like thing

go/cmd/examples/go-wasm-web/build.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Pre-compile step: run the directive codegen, build the Go client to WebAssembly,
+# and stage the JS shim. Run the dev server instead (go run ./server) for hot
+# reload; this script is for a one-off/production-style build. Run from anywhere.
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+echo "==> Generating directive glue (//gowasm:page, //gowasm:layout, //gowasm:server)"
+go run kjol/cmd/gowasmgen ./app
+
+echo "==> Compiling ./wasm to wwwroot/app.wasm (GOOS=js GOARCH=wasm)"
+GOOS=js GOARCH=wasm go build -o wwwroot/app.wasm ./wasm
+
+echo "==> Copying Go's wasm_exec.js shim into wwwroot/"
+GOROOT="$(go env GOROOT)"
+if [ -f "$GOROOT/lib/wasm/wasm_exec.js" ]; then
+  cp "$GOROOT/lib/wasm/wasm_exec.js" wwwroot/wasm_exec.js   # Go >= 1.24
+else
+  cp "$GOROOT/misc/wasm/wasm_exec.js" wwwroot/wasm_exec.js  # Go <= 1.23
+fi
+
+echo "==> Done. Run the server with:  go run ./server"
+echo "    then open http://localhost:8085"