From e954ed25099d9217d30a5a4d38e5dfee5acee0fd Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Sun, 17 Jan 2021 15:22:52 -0500
Subject: [PATCH] feat(ssr): isolated mode

---
 packages/vite/src/node/server/index.ts        |  9 ++++++---
 packages/vite/src/node/ssr/ssrModuleLoader.ts | 11 +++++++----
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/packages/vite/src/node/server/index.ts b/packages/vite/src/node/server/index.ts
index 4a01ba2d07f3a8..887a111992b0fd 100644
--- a/packages/vite/src/node/server/index.ts
+++ b/packages/vite/src/node/server/index.ts
@@ -187,7 +187,10 @@ export interface ViteDevServer {
   /**
    * Load a given URL as an instantiated module for SSR.
    */
-  ssrLoadModule(url: string): Promise<Record<string, any>>
+  ssrLoadModule(
+    url: string,
+    options?: { isolated?: boolean }
+  ): Promise<Record<string, any>>
   /**
    * Fix ssr error stacktrace
    */
@@ -254,11 +257,11 @@ export async function createServer(
     transformRequest(url, options) {
       return transformRequest(url, server, options)
     },
-    ssrLoadModule(url) {
+    ssrLoadModule(url, options) {
       if (!server._ssrExternals) {
         server._ssrExternals = resolveSSRExternal(config.root)
       }
-      return ssrLoadModule(url, server)
+      return ssrLoadModule(url, server, !!options?.isolated)
     },
     ssrFixStacktrace(e) {
       if (e.stack) {
diff --git a/packages/vite/src/node/ssr/ssrModuleLoader.ts b/packages/vite/src/node/ssr/ssrModuleLoader.ts
index 94325f6788dddd..b4dc803cfe65e9 100644
--- a/packages/vite/src/node/ssr/ssrModuleLoader.ts
+++ b/packages/vite/src/node/ssr/ssrModuleLoader.ts
@@ -14,6 +14,7 @@ import { transformRequest } from '../server/transformRequest'
 export async function ssrLoadModule(
   url: string,
   server: ViteDevServer,
+  isolatedMode: boolean,
   urlStack: string[] = []
 ): Promise<Record<string, any>> {
   if (urlStack.includes(url)) {
@@ -25,11 +26,13 @@ export async function ssrLoadModule(
 
   const { moduleGraph } = server
   const mod = await moduleGraph.ensureEntryFromUrl(url)
-  if (mod.ssrModule) {
+  if (!isolatedMode && mod.ssrModule) {
     return mod.ssrModule
   }
 
-  const result = await transformRequest(url, server, { ssr: true })
+  const result =
+    mod.ssrTransformResult ||
+    (await transformRequest(url, server, { ssr: true }))
   if (!result) {
     // TODO more info? is this even necessary?
     throw new Error(`failed to load module for ssr: $${url}`)
@@ -40,7 +43,7 @@ export async function ssrLoadModule(
   await Promise.all(
     result.deps!.map((dep) => {
       if (!isExternal(dep)) {
-        return ssrLoadModule(dep, server, urlStack.concat(url))
+        return ssrLoadModule(dep, server, isolatedMode, urlStack.concat(url))
       }
     })
   )
@@ -70,7 +73,7 @@ export async function ssrLoadModule(
     if (isExternal(dep)) {
       return Promise.resolve(nodeRequire(dep, mod.file))
     } else {
-      return ssrLoadModule(dep, server, urlStack.concat(url))
+      return ssrLoadModule(dep, server, isolatedMode, urlStack.concat(url))
     }
   }