Revert "Fix missing cause"

This reverts commit 90fad31.

Messes with error replaying.
Fine to temporarily regress.

packages/next/src/server/lib/router-utils/setup-dev-bundler.ts

@@ -1046,8 +1046,10 @@ async function startWatcher(opts: SetupOpts) {
                 frames
               )
 
-              err.stack = stack
-              errorToLog = err
+              const error: NextError = new Error(err.message)
+              error.stack = stack
+              error.digest = err.digest
+              errorToLog = error
             } else {
               errorToLog = err
             }

test/integration/edge-runtime-streaming-error/test/index.test.ts

@@ -50,24 +50,22 @@ function createContext() {
   return ctx
 }
 
-;(process.env.TURBOPACK_BUILD ? describe.skip : describe)(
-  'development mode',
-  () => {
-    const context = createContext()
+// TODO(veil): Missing `cause` in Turbopack
+;(process.env.TURBOPACK ? describe.skip : describe)('development mode', () => {
+  const context = createContext()
 
-    beforeAll(async () => {
-      context.appPort = await findPort()
-      context.app = await launchApp(appDir, context.appPort, {
-        ...context.handler,
-        env: { __NEXT_TEST_WITH_DEVTOOL: '1' },
-      })
+  beforeAll(async () => {
+    context.appPort = await findPort()
+    context.app = await launchApp(appDir, context.appPort, {
+      ...context.handler,
+      env: { __NEXT_TEST_WITH_DEVTOOL: '1' },
     })
+  })
 
-    afterAll(() => killApp(context.app))
+  afterAll(() => killApp(context.app))
 
-    it('logs the error correctly', test(context))
-  }
-)
+  it('logs the error correctly', test(context))
+})
 ;(process.env.TURBOPACK_DEV ? describe.skip : describe)(
   'production mode',
   () => {