first commit

test/integration/webpack-require-hook/next.config.js

@@ -0,0 +1,11 @@
+module.exports = {
+  webpack(config) {
+    console.log('Initialized config')
+    if (
+      require('webpack/lib/node/NodeTargetPlugin') !==
+      require('next/dist/compiled/webpack/NodeTargetPlugin')
+    )
+      throw new Error('Webpack require hook not applying')
+    return config
+  },
+}

test/integration/webpack-require-hook/pages/hello.js

@@ -0,0 +1,5 @@
+export default () => (
+  <>
+    <h3>Hi 👋</h3>
+  </>
+)

test/integration/webpack-require-hook/test/index.test.ts

@@ -0,0 +1,52 @@
+/* eslint-env jest */
+
+import path from 'path'
+
+import {
+  nextBuild,
+  findPort,
+  launchApp,
+  renderViaHTTP,
+  killApp,
+} from 'next-test-utils'
+
+const appDir = path.join(__dirname, '..')
+
+// Skip webpack specific test in Turbopack
+;(process.env.IS_TURBOPACK_TEST ? describe.skip : describe)(
+  'Handles Webpack Require Hook',
+  () => {
+    describe('build', () => {
+      it('Does not error during build', async () => {
+        const { stdout, stderr } = await nextBuild(appDir, [], {
+          stdout: true,
+          stderr: true,
+        })
+        const errors = stderr
+          .split('\n')
+          .filter((line) => line && !line.trim().startsWith('⚠'))
+        expect(errors).toEqual([])
+        expect(stdout).toMatch(/Initialized config/)
+      })
+    })
+    ;(process.env.TURBOPACK_BUILD ? describe.skip : describe)(
+      'development mode',
+      () => {
+        it('Applies and does not error during development', async () => {
+          let output
+          const handleOutput = (msg) => {
+            output += msg
+          }
+          const appPort = await findPort()
+          const app = await launchApp(appDir, appPort, {
+            onStdout: handleOutput,
+            onStderr: handleOutput,
+          })
+          await renderViaHTTP(appPort, '/')
+          await killApp(app)
+          expect(output).toMatch(/Initialized config/)
+        })
+      }
+    )
+  }
+)