refactor: vue takes precedence over js in pages and layouts

lib/builder/builder.js

@@ -271,7 +271,9 @@ module.exports = class Builder {
           hasErrorLayout = true
           return
         }
-        templateVars.layouts[name] = this.relativeToBuild(this.options.srcDir, file)
+        if (!templateVars.layouts[name] || /\.vue$/.test(file)) {
+          templateVars.layouts[name] = this.relativeToBuild(this.options.srcDir, file)
+        }
       })
       if (!templateVars.components.ErrorPage && hasErrorLayout) {
         templateVars.components.ErrorPage = this.relativeToBuild(this.options.srcDir, 'layouts/error.vue')
@@ -289,8 +291,14 @@ module.exports = class Builder {
     // If user defined a custom method to create routes
     if (this._nuxtPages) {
       // Use nuxt.js createRoutes bases on pages/
-      const files = await glob('pages/**/*.{vue,js}', { cwd: this.options.srcDir })
-      templateVars.router.routes = createRoutes(files, this.options.srcDir)
+      const files = {};
+      (await glob('pages/**/*.{vue,js}', { cwd: this.options.srcDir })).forEach(f => {
+        const key = f.replace(/\.(js|vue)$/, '')
+        if (/\.vue$/.test(f) || !files[key]) {
+          files[key] = f
+        }
+      })
+      templateVars.router.routes = createRoutes(Object.values(files), this.options.srcDir)
     } else {
       templateVars.router.routes = this.options.build.createRoutes(this.options.srcDir)
     }

test/basic.ssr.test.js

@@ -250,6 +250,11 @@ test('/jsx', async t => {
   t.true(html.includes('<h1>JSX Page</h1>'))
 })
 
+test('/js-link', async t => {
+  const { html } = await nuxt.renderRoute('/js-link')
+  t.true(html.includes('<h1>vue file is first-class</h1>'))
+})
+
 // Close server and ask nuxt to stop listening to file changes
 test.after('Closing server and nuxt.js', t => {
   nuxt.close()

test/fixtures/basic/pages/js-link.js

@@ -0,0 +1,2 @@
+export default {
+}

test/fixtures/basic/pages/js-link.vue

@@ -0,0 +1,5 @@
+<template>
+  <h1>vue file is first-class</h1>
+</template>
+
+<script src="./js-link.js"></script>