add env example

examples/env/.gitignore

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+dist

examples/env/Makefile

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+.PHONY: dev
+dev:
+	wrangler dev
+
+.PHONY: build
+build:
+	mkdir -p dist
+	tinygo build -o ./dist/app.wasm -target wasm ./...
+
+.PHONY: publish
+publish:
+	wrangler publish

examples/env/README.md

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+# env
+
+* This app returns a message set as `MY_ENV` in wrangler.toml.
+
+## Demo
+
+* https://env.syumai.workers.dev/
+
+## Development
+
+### Requirements
+
+This project requires these tools to be installed globally.
+
+* wrangler
+* tinygo
+
+### Commands
+
+```
+make dev     # run dev server
+make build   # build Go Wasm binary
+make publish # publish worker
+```
+
+## Author
+
+syumai
+
+## License
+
+MIT

examples/env/go.mod

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+module github.com/syumai/workers/examples/env
+
+go 1.18
+
+require github.com/syumai/workers v0.0.0
+
+replace github.com/syumai/workers => ../../

examples/env/main.go

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+package main
+
+import (
+	"fmt"
+	"net/http"
+	"syscall/js"
+
+	"github.com/syumai/workers"
+)
+
+func main() {
+	handler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		envVal := js.Global().Get("MY_ENV")
+		fmt.Fprintf(w, "MY_ENV: %s", envVal)
+	})
+	workers.Serve(handler)
+}

examples/env/worker.mjs

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+import "../assets/polyfill_performance.js";
+import "../assets/wasm_exec.js";
+import mod from "./dist/app.wasm";
+
+const go = new Go();
+
+const load = WebAssembly.instantiate(mod, go.importObject).then((instance) => {
+  go.run(instance);
+  return instance;
+});
+
+async function processRequest(event) {
+  const req = event.request;
+  await load;
+  return handleRequest(req);
+}
+
+addEventListener("fetch", (event) => {
+  event.respondWith(processRequest(event));
+})

examples/env/wrangler.toml

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+name = "env"
+main = "./worker.mjs"
+compatibility_date = "2022-05-13"
+compatibility_flags = [
+    "streams_enable_constructors"
+]
+
+[build]
+command = "make build"
+
+# declare environment variables and assign values
+# https://developers.cloudflare.com/workers/platform/environment-variables/
+[vars]
+MY_ENV = 'my env value'