first commit

test/integration/broken-webpack-plugin/next.config.js

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+class BrokenPlugin {
+  apply(compiler) {
+    compiler.hooks.watchRun.tapPromise('BrokenPlugin', async () => {
+      throw new Error('oops')
+    })
+  }
+}
+
+module.exports = {
+  webpack(config, { isServer }) {
+    if (!isServer) {
+      config.plugins.push(new BrokenPlugin())
+    }
+    return config
+  },
+}

test/integration/broken-webpack-plugin/pages/index.js

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+export default function Test() {
+  return <p>hello from index</p>
+}

test/integration/broken-webpack-plugin/test/index.test.ts

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+/* eslint-env jest */
+
+import { findPort, killApp, launchApp, renderViaHTTP } from 'next-test-utils'
+import { join } from 'path'
+import waitPort from 'wait-port'
+
+const appDir = join(__dirname, '../')
+
+let appPort
+let app
+
+  // Skipped as it's not relevant to Turbopack.
+;(process.env.IS_TURBOPACK_TEST ? describe.skip : describe)(
+  'Handles a broken webpack plugin (precompile)',
+  () => {
+    let stderr = ''
+    beforeAll(async () => {
+      appPort = await findPort()
+      app = await launchApp(appDir, appPort, {
+        nextStart: true,
+        onStderr(text) {
+          stderr += text
+        },
+      })
+      await waitPort({
+        host: 'localhost',
+        port: appPort,
+      })
+    })
+    afterAll(() => killApp(app))
+
+    beforeEach(() => {
+      stderr = ''
+    })
+
+    it('should render error correctly', async () => {
+      const text = await renderViaHTTP(appPort, '/')
+      expect(text).toContain('Internal Server Error')
+
+      expect(stderr).toMatch('Error: oops')
+    })
+  }
+)