Rewrite url when exporting only if there's a href. (#2316)

lib/link.js

@@ -129,6 +129,7 @@ export default class Link extends Component {
     // Add the ending slash to the paths. So, we can serve the
     // "<page>/index.html" directly.
     if (
+      props.href &&
       typeof __NEXT_DATA__ !== 'undefined' &&
       __NEXT_DATA__.nextExport
     ) {

test/integration/static/next.config.js

@@ -3,6 +3,7 @@ module.exports = {
     return {
       '/': { page: '/' },
       '/about': { page: '/about' },
+      '/button-link': { page: '/button-link' },
       '/get-initial-props-with-no-query': { page: '/get-initial-props-with-no-query' },
       '/counter': { page: '/counter' },
       '/dynamic-imports': { page: '/dynamic-imports' },

test/integration/static/pages/button-link.js

@@ -0,0 +1,12 @@
+import Link from 'next/link'
+
+export default () => (
+  <div id='button-link-page'>
+    <div>
+      <Link href='/'>
+        <button>Go Back</button>
+      </Link>
+    </div>
+    <p>This is the About page</p>
+  </div>
+)

test/integration/static/test/browser.js

@@ -135,6 +135,18 @@ export default function (context) {
       browser.close()
     })
 
+    it('should navigate even if used a button inside <Link />', async () => {
+      const browser = await webdriver(context.port, '/button-link')
+
+      const text = await browser
+          .elementByCss('button').click()
+          .waitForElementByCss('#home-page')
+          .elementByCss('#home-page p').text()
+
+      expect(text).toBe('This is the home page')
+      browser.close()
+    })
+
     describe('pages in the nested level: level1', () => {
       it('should render the home page', async () => {
         const browser = await webdriver(context.port, '/')

yarn.lock

@@ -5319,7 +5319,11 @@ utils-merge@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/utils-merge/-/utils-merge-1.0.0.tgz#0294fb922bb9375153541c4f7096231f287c8af8"
 
-uuid@3.0.1, uuid@^3.0.0:
+uuid@3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.1.0.tgz#3dd3d3e790abc24d7b0d3a034ffababe28ebbc04"
+
+uuid@^3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.0.1.tgz#6544bba2dfda8c1cf17e629a3a305e2bb1fee6c1"