feat: control BundleRenderer shouldPrefetch option (vuejs#463)

Author: LinFeng1997

docs/config/README.md

@@ -105,6 +105,13 @@ Also, only enable this if you are able to deploy your site with SSL, since servi
 
 Specify locales for i18n support. For more details, see the guide on [Internationalization](../guide/i18n.md).
 
+### shouldPrefetch
+
+- Type: `Function`
+- Default: `() => true`
+
+A function to control what files should have `<link rel="preload">` resource hints generated. See [shouldPrefetch](https://ssr.vuejs.org/api/#shouldprefetch).
+
 ## Theming
 
 ### theme

docs/zh/config/README.md

@@ -104,6 +104,13 @@ module.exports = {
 
 提供多语言支持的语言配置。具体细节请查看 [多语言支持](../guide/i18n.md)。
 
+### shouldPrefetch
+
+- 类型: `Function`
+- 默认值: `() => true`
+
+一个函数，用来控制对于哪些文件，是需要生成 `<link rel="prefetch">` 资源提示的。请参考 [shouldPrefetch](https://ssr.vuejs.org/zh/api/#shouldpreload)。
+
 ## 主题
 
 ### theme

lib/build.js

@@ -56,6 +56,7 @@ module.exports = async function build (sourceDir, cliOptions = {}) {
     clientManifest,
     runInNewContext: false,
     inject: false,
+    shouldPrefetch: options.siteConfig.shouldPrefetch || (() => true),
     template: await fs.readFile(path.resolve(__dirname, 'app/index.ssr.html'), 'utf-8')
   })