feat: pwa option (defaults to false)

Author: ulivz

docs/README.md

@@ -209,6 +209,25 @@ Whether to extract summary from source markdowns.
 Set the length of summary.
 
 
+### pwa
+
+- Type: `boolean`
+- Default: `false`
+
+Whether to enable PWA support. this option is powered by the [official
+PWA plugin](https://v1.vuepress.vuejs.org/plugin/official/plugin-pwa.html).
+
+if you enable this option, the default options of the internal PWA
+plugin is as follows:
+
+```js
+{
+  serviceWorker: true,
+  updatePopup: true
+}
+```
+
+
 ## Front Matter
 
 ### tag/tags

index.js

@@ -6,7 +6,8 @@ module.exports = (themeConfig, ctx) => {
     themeConfig,
     {
       summary: true,
-      summaryLength: 200
+      summaryLength: 200,
+      pwa: false,
     }
   )
 
@@ -62,16 +63,21 @@ module.exports = (themeConfig, ctx) => {
     ['@vuepress/search', {
       searchMaxSuggestions: 10
     }],
-    ['@vuepress/pwa', {
-      serviceWorker: true,
-      updatePopup: true
-    }],
     [
       '@vuepress/blog',
       blogPluginOptions,
     ],
   ]
 
+  if (themeConfig.pwa) {
+    plugins.push(
+      ['@vuepress/pwa', {
+        serviceWorker: true,
+        updatePopup: true
+      }],
+    )
+  }
+
   const config = {
     plugins,
   }