Merge pull request #51 from vuejs/master

jeffposnick · web-flow · commit 951ff9ca253b · 2018-01-11T11:07:21.000-05:00
support include: 'initial'
diff --git a/README.md b/README.md
@@ -132,15 +132,14 @@ will be injected into the document `<head>`:
 <link rel="preload" as="script" href="chunk.d15e7fdfc91b34bb78c4.js">
 ```
 
-You can also configure the plugin to preload all chunks (vendor, async, normal chunks) using
-`include`:
+You can also configure the plugin to preload all chunks (vendor, async, normal chunks) using `include: 'all'`, or only preload initial chunks with `include: 'initial'`:
 
 ```js
 plugins: [
   new HtmlWebpackPlugin(),
   new PreloadWebpackPlugin({
     rel: 'preload',
-    include: 'all'
+    include: 'all' // or 'initial'
   })
 ]
 ```
diff --git a/index.js b/index.js
@@ -73,6 +73,12 @@ class PreloadPlugin {
           } catch (e) {
             extractedChunks = compilation.chunks;
           }
+        } else if (options.include === 'initial') {
+          try {
+            extractedChunks = compilation.chunks.filter(chunk => chunk.isInitial());
+          } catch (e) {
+            extractedChunks = compilation.chunks;
+          }
         } else if (options.include === 'all') {
             // Async chunks, vendor chunks, normal chunks.
           extractedChunks = compilation.chunks;
