first commit

test/integration/invalid-page-automatic-static-optimization/pages/also-invalid.js

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+export default 'just a string'

test/integration/invalid-page-automatic-static-optimization/pages/also-valid.js

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+import React, { Component } from 'react'
+
+export default class AlsoValid extends Component {
+  render() {
+    return <div>Hi there</div>
+  }
+}

test/integration/invalid-page-automatic-static-optimization/pages/invalid.js

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+const obj = {
+  something: 'idk',
+}
+
+export default obj

test/integration/invalid-page-automatic-static-optimization/pages/valid.js

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+export default () => <p>Hello world</p>

test/integration/invalid-page-automatic-static-optimization/test/index.test.ts

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+/* eslint-env jest */
+
+import fs from 'fs-extra'
+import path from 'path'
+import { nextBuild } from 'next-test-utils'
+
+const appDir = path.join(__dirname, '..')
+
+describe('Invalid Page automatic static optimization', () => {
+  ;(process.env.TURBOPACK_DEV ? describe.skip : describe)(
+    'production mode',
+    () => {
+      it('Fails softly with descriptive error', async () => {
+        const { stderr } = await nextBuild(appDir, [], { stderr: true })
+
+        expect(stderr).toMatch(
+          /Build optimization failed: found pages without a React Component as default export in/
+        )
+        expect(stderr).toMatch(/pages\/invalid/)
+        expect(stderr).toMatch(/pages\/also-invalid/)
+      })
+
+      it('handles non-error correctly', async () => {
+        const testPage = path.join(appDir, 'pages/[slug].js')
+        await fs.rename(
+          path.join(appDir, 'pages'),
+          path.join(appDir, 'pages-bak')
+        )
+
+        await fs.ensureDir(path.join(appDir, 'pages'))
+        await fs.writeFile(
+          testPage,
+          `
+      export default function Page() {
+        return <p>hello world</p>
+      }
+
+      export function getStaticPaths() {
+        throw 'invalid API token'
+      }
+
+      export function getStaticProps() {
+        return {
+          props: {
+            hello: 'world'
+          }
+        }
+      }
+    `
+        )
+
+        try {
+          const { stderr } = await nextBuild(appDir, [], { stderr: true })
+          expect(stderr).toMatch(/invalid API token/)
+          expect(stderr).not.toMatch(/without a React Component/)
+        } finally {
+          await fs.remove(path.join(appDir, 'pages'))
+          await fs.rename(
+            path.join(appDir, 'pages-bak'),
+            path.join(appDir, 'pages')
+          )
+        }
+      })
+    }
+  )
+})