Check for window before adding event listener

packages/next/client/components/react-dev-overlay/internal/helpers/use-error-handler.ts

@@ -31,55 +31,61 @@ const rejectionQueue: Array<Error> = []
 const errorHandlers: Array<ErrorHandler> = []
 const rejectionHandlers: Array<ErrorHandler> = []
 
-// These event handlers must be added outside of the hook because there is no
-// guarantee that the hook will be alive in a mounted component in time to
-// when the errors occur.
-window.addEventListener('error', (ev: WindowEventMap['error']): void => {
-  if (isNextRouterError(ev.error)) {
-    ev.preventDefault()
-    return
-  }
-
-  RuntimeErrorHandler.hadRuntimeError = true
-
-  const error = ev?.error
-  if (!error || !(error instanceof Error) || typeof error.stack !== 'string') {
-    // A non-error was thrown, we don't have anything to show. :-(
-    return
-  }
-
-  if (isHydrationError(error)) {
-    error.message += `\n\nSee more info here: https://nextjs.org/docs/messages/react-hydration-error`
-  }
-
-  const e = error
-  errorQueue.push(e)
-  for (const handler of errorHandlers) {
-    handler(e)
-  }
-})
-window.addEventListener(
-  'unhandledrejection',
-  (ev: WindowEventMap['unhandledrejection']): void => {
+if (typeof window !== 'undefined') {
+  // These event handlers must be added outside of the hook because there is no
+  // guarantee that the hook will be alive in a mounted component in time to
+  // when the errors occur.
+  window.addEventListener('error', (ev: WindowEventMap['error']): void => {
+    if (isNextRouterError(ev.error)) {
+      ev.preventDefault()
+      return
+    }
+
     RuntimeErrorHandler.hadRuntimeError = true
 
-    const reason = ev?.reason
+    const error = ev?.error
     if (
-      !reason ||
-      !(reason instanceof Error) ||
-      typeof reason.stack !== 'string'
+      !error ||
+      !(error instanceof Error) ||
+      typeof error.stack !== 'string'
     ) {
       // A non-error was thrown, we don't have anything to show. :-(
       return
     }
 
-    const e = reason
-    rejectionQueue.push(e)
-    for (const handler of rejectionHandlers) {
+    if (isHydrationError(error)) {
+      error.message += `\n\nSee more info here: https://nextjs.org/docs/messages/react-hydration-error`
+    }
+
+    const e = error
+    errorQueue.push(e)
+    for (const handler of errorHandlers) {
       handler(e)
     }
-  }
-)
+  })
+  window.addEventListener(
+    'unhandledrejection',
+    (ev: WindowEventMap['unhandledrejection']): void => {
+      RuntimeErrorHandler.hadRuntimeError = true
+
+      const reason = ev?.reason
+      if (
+        !reason ||
+        !(reason instanceof Error) ||
+        typeof reason.stack !== 'string'
+      ) {
+        // A non-error was thrown, we don't have anything to show. :-(
+        return
+      }
+
+      const e = reason
+      rejectionQueue.push(e)
+      for (const handler of rejectionHandlers) {
+        handler(e)
+      }
+    }
+  )
+}
 
 export function useErrorHandler(
   handleOnUnhandledError: ErrorHandler,