Enable source mapping in Next.js

For source-mapped backtraces to be emitted for Next.js backend errors
when Next.js is running in production mode, the webpack configuration
needs to be tweaked in order to emit backtraces, and the
`--enable-source-maps` flag needs to be passed to the Node.js runtime
when starting the Next.js application, using the `NODE_OPTIONS`
environment variable.

nodejs/nextjs-13-app/app/next.config.js

@@ -5,6 +5,12 @@ const nextConfig = {
     // Add the following line inside the object
     instrumentationHook: true,
   },
+  webpack: (config, {isServer}) => {
+    if (isServer) {
+      config.devtool = 'eval-source-map'
+    }
+    return config
+  }
 };
 
 module.exports = nextConfig

nodejs/nextjs-13-app/app/package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "dev": "next dev",
     "build": "next build",
-    "start": "next start",
+    "start": "NODE_OPTIONS=--enable-source-maps next start",
     "lint": "next lint"
   },
   "dependencies": {

nodejs/nextjs-13-pages/app/next.config.js

@@ -4,6 +4,12 @@ const nextConfig = {
   experimental: {
     instrumentationHook: true,
   },
+  webpack: (config, {isServer}) => {
+    if (isServer) {
+      config.devtool = 'eval-source-map'
+    }
+    return config
+  }
 }
 
 module.exports = nextConfig

nodejs/nextjs-13-pages/app/package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "dev": "next dev",
     "build": "next build",
-    "start": "next start",
+    "start": "NODE_OPTIONS=--enable-source-maps next start",
     "lint": "next lint"
   },
   "dependencies": {

nodejs/nextjs-14-app/app/next.config.mjs

@@ -5,6 +5,12 @@ const nextConfig = {
     instrumentationHook: true,
     serverComponentsExternalPackages: ['@appsignal/nodejs'],
   },
+  webpack: (config, {isServer}) => {
+    if (isServer) {
+      config.devtool = 'eval-source-map'
+    }
+    return config
+  }
 };
 
 export default nextConfig;

nodejs/nextjs-14-app/app/package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "dev": "next dev",
     "build": "next build",
-    "start": "next start",
+    "start": "NODE_OPTIONS=--enable-source-maps next start",
     "lint": "next lint"
   },
   "dependencies": {

nodejs/nextjs-14-pages/app/next.config.mjs

@@ -5,6 +5,12 @@ const nextConfig = {
     instrumentationHook: true,
     serverComponentsExternalPackages: ['@appsignal/nodejs'],
   },
+  webpack: (config, {isServer}) => {
+    if (isServer) {
+      config.devtool = 'eval-source-map'
+    }
+    return config
+  }
 };
 
 export default nextConfig;

nodejs/nextjs-14-pages/app/package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "dev": "next dev",
     "build": "next build",
-    "start": "next start",
+    "start": "NODE_OPTIONS=--enable-source-maps next start",
     "lint": "next lint"
   },
   "dependencies": {