add reproduction code of syumai/workers#100

syumai-workers-repro-issue-100/.gitignore

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+build
+node_modules
+.wrangler

syumai-workers-repro-issue-100/Makefile

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+.PHONY: dev
+dev:
+	wrangler dev
+
+.PHONY: build
+build:
+	go run github.com/syumai/workers/cmd/[email protected] -mode=go
+	GOOS=js GOARCH=wasm go build -o ./build/app.wasm .
+
+.PHONY: deploy
+deploy:
+	wrangler deploy

syumai-workers-repro-issue-100/README.md

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+# syumai-workers-repro-issue-100
+
+* A reproduction code of https://github.com/syumai/workers/issues/100
+
+## Reproduction code
+
+* A HandlerFunc without writing response body causes weird error.
+
+```go
+func main() {
+	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+		// doing nothing here causes weird error
+	})
+	workers.Serve(nil) // use http.DefaultServeMux
+}
+```
+
+## How to reproduce
+
+```
+$ make dev # run this command in another terminal
+$ curl localhost:8787
+TypeError: Cannot read properties of undefined (reading 'exports')
+    at syscall/js.valueNew (file:///home/syumai/go/src/github.com/syumai/workers-playground/syumai-workers-repro-issue-100/build/wasm_exec.js:395:24)
+    at [object Object]
+    at [object Object]
+    at [object Object]
+    at [object Object]
+    at [object Object]
+    at globalThis.Go._resume (file:///home/syumai/go/src/github.com/syumai/workers-playground/syumai-workers-repro-issue-100/build/wasm_exec.js:553:23)
+    at Object.handleRequest (file:///home/syumai/go/src/github.com/syumai/workers-playground/syumai-workers-repro-issue-100/build/wasm_exec.js:564:8)
+    at Object.fetch (file:///home/syumai/go/src/github.com/syumai/workers-playground/syumai-workers-repro-issue-100/build/shim.mjs:51:18)
+    at async jsonError (file:///home/syumai/.nvm/versions/node/v20.12.2/lib/node_modules/wrangler/templates/middleware/middleware-miniflare3-json-error.ts:22:10)
+```
+

syumai-workers-repro-issue-100/go.mod

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+module github.com/syumai/workers-playground/syumai-workers-repro-issue-100
+
+go 1.21.3
+
+toolchain go1.22.2
+
+require github.com/syumai/workers v0.23.3

syumai-workers-repro-issue-100/go.sum

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+github.com/syumai/workers v0.23.3 h1:7RZwe+EhOhLlFvrDMbgWFf2wc/G17i4uq4GsSG0uNrI=
+github.com/syumai/workers v0.23.3/go.mod h1:ZnqmdiHNBrbxOLrZ/HJ5jzHy6af9cmiNZk10R9NrIEA=

syumai-workers-repro-issue-100/main.go

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+package main
+
+import (
+	"net/http"
+
+	"github.com/syumai/workers"
+)
+
+func main() {
+	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+		// doing nothing here causes weird error
+	})
+	workers.Serve(nil) // use http.DefaultServeMux
+}

syumai-workers-repro-issue-100/wrangler.toml

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+name = "go-worker"
+main = "./build/worker.mjs"
+compatibility_date = "2024-04-15"
+
+[build]
+command = "make build"