From e1337a86e623c1b556d3670685633ca7768ff2ed Mon Sep 17 00:00:00 2001
From: Cursor Agent <cursoragent@cursor.com>
Date: Sun, 17 May 2026 14:18:26 +0000
Subject: [PATCH] Handle scanner POSTs without router action errors

Co-authored-by: Kent C. Dodds <me+github@kentcdodds.com>
---
 epicshop/package-lock.json     |   1 +
 epicshop/package.json          |   3 +
 epicshop/patch-workshop-app.js | 136 +++++++++++++++++++++++++++++++++
 3 files changed, 140 insertions(+)
 create mode 100644 epicshop/patch-workshop-app.js

diff --git a/epicshop/package-lock.json b/epicshop/package-lock.json
index 80839fb..4f7fb35 100644
--- a/epicshop/package-lock.json
+++ b/epicshop/package-lock.json
@@ -4,6 +4,7 @@
   "requires": true,
   "packages": {
     "": {
+      "hasInstallScript": true,
       "dependencies": {
         "@epic-web/workshop-app": "^6.90.3",
         "@epic-web/workshop-utils": "^6.90.3",
diff --git a/epicshop/package.json b/epicshop/package.json
index bbb37fa..57b44fb 100644
--- a/epicshop/package.json
+++ b/epicshop/package.json
@@ -1,5 +1,8 @@
 {
   "type": "module",
+  "scripts": {
+    "postinstall": "node ./patch-workshop-app.js"
+  },
   "dependencies": {
     "@epic-web/workshop-app": "^6.90.3",
     "@epic-web/workshop-utils": "^6.90.3",
diff --git a/epicshop/patch-workshop-app.js b/epicshop/patch-workshop-app.js
new file mode 100644
index 0000000..9de8d0e
--- /dev/null
+++ b/epicshop/patch-workshop-app.js
@@ -0,0 +1,136 @@
+import fs from 'node:fs/promises'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+const workshopAppBuildPath = path.join(
+	__dirname,
+	'node_modules',
+	'@epic-web',
+	'workshop-app',
+	'build',
+	'server',
+	'index.js',
+)
+
+const catchAllAction = `async function catchAllNotFoundAction() {
+  throw new Response("Not found", {
+    status: 404
+  });
+}
+`
+
+const rootAction = `async function rootMethodNotAllowedAction() {
+  throw new Response("Method Not Allowed", {
+    status: 405,
+    headers: {
+      Allow: "GET, HEAD, OPTIONS"
+    }
+  });
+}
+`
+
+const rootRouteWithoutAction = `  ErrorBoundary: ErrorBoundary$8,
+  default: root,
+  links,
+  loader: loader$M,
+  meta: meta$8`
+
+const rootRouteWithAction = `  ErrorBoundary: ErrorBoundary$8,
+  action: rootMethodNotAllowedAction,
+  default: root,
+  links,
+  loader: loader$M,
+  meta: meta$8`
+
+const loaderEnd = `  throw new Response("Not found", {
+    status: 404
+  });
+}
+`
+
+const routeWithoutAction = `  ErrorBoundary: ErrorBoundary$7,
+  default: $,
+  loader: loader$L`
+
+const routeWithAction = `  ErrorBoundary: ErrorBoundary$7,
+  action: catchAllNotFoundAction,
+  default: $,
+  loader: loader$L`
+
+const catchAllManifestWithoutAction =
+	/("routes\/\$":\s*\{[^{}]*?"hasAction": )false/
+const catchAllManifestWithAction =
+	/"routes\/\$":\s*\{[^{}]*?"hasAction": true/
+const rootManifestWithoutAction = /("root":\s*\{[^{}]*?"hasAction": )false/
+const rootManifestWithAction = /"root":\s*\{[^{}]*?"hasAction": true/
+
+let serverBuild = await fs.readFile(workshopAppBuildPath, 'utf8')
+
+function replaceOrThrow(contents, search, replacement, message) {
+	if (!contents.includes(search)) {
+		throw new Error(message)
+	}
+	return contents.replace(search, replacement)
+}
+
+function replaceRegexOrThrow(contents, search, replacement, message) {
+	if (!search.test(contents)) {
+		throw new Error(message)
+	}
+	return contents.replace(search, replacement)
+}
+
+if (!serverBuild.includes('action: rootMethodNotAllowedAction')) {
+	serverBuild = replaceOrThrow(
+		serverBuild,
+		rootRouteWithoutAction,
+		rootRouteWithAction,
+		'Could not find the workshop app root route module.',
+	)
+	serverBuild = replaceOrThrow(
+		serverBuild,
+		'const route0 = /* @__PURE__ */ Object.freeze',
+		`${rootAction}const route0 = /* @__PURE__ */ Object.freeze`,
+		'Could not find the workshop app root route declaration.',
+	)
+}
+
+if (!serverBuild.includes('action: catchAllNotFoundAction')) {
+	serverBuild = replaceOrThrow(
+		serverBuild,
+		loaderEnd,
+		`${loaderEnd}${catchAllAction}`,
+		'Could not find the workshop app catch-all loader.',
+	)
+	serverBuild = replaceOrThrow(
+		serverBuild,
+		routeWithoutAction,
+		routeWithAction,
+		'Could not find the workshop app catch-all route module.',
+	)
+}
+
+if (catchAllManifestWithoutAction.test(serverBuild)) {
+	serverBuild = replaceRegexOrThrow(
+		serverBuild,
+		catchAllManifestWithoutAction,
+		'$1true',
+		'Could not mark the workshop app catch-all route as having an action.',
+	)
+} else if (!catchAllManifestWithAction.test(serverBuild)) {
+	throw new Error('Could not find the workshop app catch-all route manifest.')
+}
+
+if (rootManifestWithoutAction.test(serverBuild)) {
+	serverBuild = replaceRegexOrThrow(
+		serverBuild,
+		rootManifestWithoutAction,
+		'$1true',
+		'Could not mark the workshop app root route as having an action.',
+	)
+} else if (!rootManifestWithAction.test(serverBuild)) {
+	throw new Error('Could not find the workshop app root route manifest.')
+}
+
+await fs.writeFile(workshopAppBuildPath, serverBuild)