Error on query values in exportPathMap for auto export page

packages/next/export/worker.js

@@ -37,12 +37,24 @@ export default async function({
   }
 
   try {
-    let { query = {} } = pathMap
+    const { query: originalQuery = {} } = pathMap
     const { page } = pathMap
     const filePath = path === '/' ? '/index' : path
     const ampPath = `${filePath}.amp`
+    let query = { ...originalQuery }
     let params
 
+    // We need to show a warning if they try to provide query values
+    // for an auto-exported page since they won't be available
+    const hasOrigQueryValues = Object.keys(originalQuery).length > 0
+    const queryWithAutoExportWarn = () => {
+      if (hasOrigQueryValues) {
+        throw new Error(
+          `\nError: you provided query values for ${path} which is an auto-exported page. These can not be applied since the page can no longer be re-rendered on the server. To disable auto-export for this page add \`getInitialProps\`\n`
+        )
+      }
+    }
+
     // Check if the page is a specified dynamic route
     if (isDynamicRoute(page) && page !== path) {
       params = getRouteMatcher(getRouteRegex(page))(path)
@@ -130,6 +142,7 @@ export default async function({
       // if it was auto-exported the HTML is loaded here
       if (typeof mod === 'string') {
         html = mod
+        queryWithAutoExportWarn()
       } else {
         // for non-dynamic SSG pages we should have already
         // prerendered the file
@@ -176,6 +189,7 @@ export default async function({
 
       if (typeof components.Component === 'string') {
         html = components.Component
+        queryWithAutoExportWarn()
       } else {
         curRenderOpts = { ...components, ...renderOpts, ampPath }
         html = await renderMethod(req, res, page, query, curRenderOpts)

test/integration/auto-export-query-error/next.config.js

@@ -0,0 +1,10 @@
+module.exports = {
+  // target: 'serverless',
+  exportPathMap() {
+    return {
+      '/': { page: '/hello', query: { first: 'second' } },
+      '/amp': { page: '/amp' },
+      '/ssr': { page: '/ssr' },
+    }
+  },
+}

test/integration/auto-export-query-error/pages/amp.js

@@ -0,0 +1,3 @@
+export const config = { amp: 'hybrid' }
+
+export default () => 'hi from hybrid AMP'

test/integration/auto-export-query-error/pages/hello.js

@@ -0,0 +1 @@
+export default () => 'hi'

test/integration/auto-export-query-error/pages/ssg.js

@@ -0,0 +1,11 @@
+const Page = () => "I'm SSRed"
+
+export async function getStaticProps() {
+  return {
+    props: {
+      hello: 'world',
+    },
+  }
+}
+
+export default Page

test/integration/auto-export-query-error/pages/ssr.js

@@ -0,0 +1,5 @@
+const Page = () => "I'm SSRed"
+
+Page.getInitialProps = () => ({ hello: 'world' })
+
+export default Page

test/integration/auto-export-query-error/test/index.test.js

@@ -0,0 +1,64 @@
+/* eslint-env jest */
+/* global jasmine */
+import path from 'path'
+import fs from 'fs-extra'
+import { nextBuild, nextExport } from 'next-test-utils'
+
+jasmine.DEFAULT_TIMEOUT_INTERVAL = 1000 * 60 * 1
+const appDir = path.join(__dirname, '..')
+const outdir = path.join(__dirname, 'out')
+const nextConfig = path.join(appDir, 'next.config.js')
+let stderr
+let exitCode
+
+const runTests = () => {
+  it('should show warning for query provided for auto exported page correctly', async () => {
+    expect(exitCode).toBe(1)
+    expect(stderr).toContain(
+      'Error: you provided query values for / which is an auto-exported page. These can not be applied since the page can no longer be re-rendered on the server. To disable auto-export for this page add `getInitialProps`'
+    )
+
+    expect(stderr).not.toContain('/amp')
+    expect(stderr).not.toContain('/ssr')
+    expect(stderr).not.toContain('/ssg')
+    expect(stderr).not.toContain('/hello')
+  })
+}
+
+let origNextConfig
+
+describe('Auto Export', () => {
+  describe('server mode', () => {
+    beforeAll(async () => {
+      await nextBuild(appDir)
+      const { stderr: curStderr, code: curCode } = await nextExport(
+        appDir,
+        { outdir },
+        { stderr: true }
+      )
+      stderr = curStderr
+      exitCode = curCode
+    })
+
+    runTests()
+  })
+
+  describe('serverless mode', () => {
+    beforeAll(async () => {
+      origNextConfig = await fs.readFile(nextConfig, 'utf8')
+      await nextBuild(appDir)
+      const { stderr: curStderr, code: curCode } = await nextExport(
+        appDir,
+        { outdir },
+        { stderr: true }
+      )
+      stderr = curStderr
+      exitCode = curCode
+    })
+    afterAll(async () => {
+      await fs.writeFile(nextConfig, origNextConfig)
+    })
+
+    runTests()
+  })
+})

test/lib/next-test-utils.js

@@ -111,8 +111,9 @@ export function runNextCommand(argv, options = {}) {
       })
     }
 
-    instance.on('close', () => {
+    instance.on('close', code => {
       resolve({
+        code,
         stdout: stdoutOutput,
         stderr: stderrOutput,
       })