add WASM blazor-like thing

go/cmd/examples/go-wasm-web/wasm/main.go

@@ -0,0 +1,31 @@
+//go:build js && wasm
+
+// Command wasm is the client entry point: it wires client capabilities into the
+// (generated) routes, then hydrates the server-rendered DOM or renders fresh.
+package main
+
+import (
+	"gowasmweb/app"
+	"kjol/vdom"
+	"kjol/wasmruntime"
+)
+
+func main() {
+	// Collect the signals created during setup so their values can be preserved
+	// across an in-place hot swap. On a normal load RestoreState is nil (fresh
+	// state); after a dev hot-reload it carries the previous instance's values,
+	// which NewSignal restores by creation order.
+	collector := vdom.BeginCollect(wasmruntime.RestoreState())
+	router := wasmruntime.NewRouter()
+	deps := app.Deps{Path: router.Path, Navigate: router.Navigate}
+	routes := app.Routes(deps)
+	vdom.EndCollect() // signals created later (during renders) aren't preserved
+	wasmruntime.PreserveState(collector)
+
+	render := func() *vdom.VNode { return app.Shell(deps, routes) }
+	if wasmruntime.HasServerContent() {
+		wasmruntime.Hydrate(render) // static route: adopt the server-rendered DOM
+	} else {
+		wasmruntime.Run(render) // client-rendered route
+	}
+}