1 files changed, 53 insertions, 0 deletions
diff --git a/node_modules/vue/src/server/template-renderer/create-async-file-mapper.js b/node_modules/vue/src/server/template-renderer/create-async-file-mapper.js
new file mode 100644
index 00000000..64c0647a
--- /dev/null
+++ b/node_modules/vue/src/server/template-renderer/create-async-file-mapper.js
@@ -0,0 +1,53 @@
+/* @flow */
+
+/**
+ * Creates a mapper that maps components used during a server-side render
+ * to async chunk files in the client-side build, so that we can inline them
+ * directly in the rendered HTML to avoid waterfall requests.
+ */
+
+import type { ClientManifest } from './index'
+
+export type AsyncFileMapper = (files: Array<string>) => Array<string>;
+
+export function createMapper (
+  clientManifest: ClientManifest
+): AsyncFileMapper {
+  const map = createMap(clientManifest)
+  // map server-side moduleIds to client-side files
+  return function mapper (moduleIds: Array<string>): Array<string> {
+    const res = new Set()
+    for (let i = 0; i < moduleIds.length; i++) {
+      const mapped = map.get(moduleIds[i])
+      if (mapped) {
+        for (let j = 0; j < mapped.length; j++) {
+          res.add(mapped[j])
+        }
+      }
+    }
+    return Array.from(res)
+  }
+}
+
+function createMap (clientManifest) {
+  const map = new Map()
+  Object.keys(clientManifest.modules).forEach(id => {
+    map.set(id, mapIdToFile(id, clientManifest))
+  })
+  return map
+}
+
+function mapIdToFile (id, clientManifest) {
+  const files = []
+  const fileIndices = clientManifest.modules[id]
+  if (fileIndices) {
+    fileIndices.forEach(index => {
+      const file = clientManifest.all[index]
+      // only include async files or non-js assets
+      if (clientManifest.async.indexOf(file) > -1 || !(/\.js($|\?)/.test(file))) {
+        files.push(file)
+      }
+    })
+  }
+  return files
+}