fix: entries in ssr.external

packages/vite/src/node/ssr/ssrExternal.ts

@@ -124,9 +124,22 @@ export function createIsConfiguredAsSsrExternal(
       if (!pkgName) {
         return undefined
       }
-      if (ssr.external?.includes(pkgName)) {
+      if (
+        // If this id is defined as external, force it as external
+        // Note that individual package entries are allowed in ssr.external
+        ssr.external?.includes(id)
+      ) {
         return true
       }
+      if (
+        // A package name in ssr.external externalizes every entry
+        ssr.external?.includes(pkgName)
+      ) {
+        // Return undefined here to avoid short-circuiting the isExternalizable check,
+        // that will filter this id out if it is not externalizable (e.g. a CSS file)
+        // We return here to make ssr.external take precedence over noExternal
+        return undefined
+      }
       if (typeof noExternal === 'boolean') {
         return !noExternal
       }
@@ -154,7 +167,7 @@ function createIsSsrExternal(
     isBuild: true
   }
 
-  const isValidPackageEntry = (id: string) => {
+  const isExternalizable = (id: string) => {
     if (!bareImportRE.test(id) || id.includes('\0')) {
       return false
     }
@@ -176,7 +189,7 @@ function createIsSsrExternal(
     let external = false
     if (!id.startsWith('.') && !path.isAbsolute(id)) {
       external =
-        isBuiltin(id) || (isConfiguredAsExternal(id) ?? isValidPackageEntry(id))
+        isBuiltin(id) || (isConfiguredAsExternal(id) ?? isExternalizable(id))
     }
     processedIds.set(id, external)
     return external

playground/ssr-deps/__tests__/ssr-deps.spec.ts

@@ -91,3 +91,10 @@ test('msg from optimized cjs with nested external', async () => {
     'Hello World!'
   )
 })
+
+test('msg from external using external entry', async () => {
+  await page.goto(url)
+  expect(await page.textContent('.external-using-external-entry')).toMatch(
+    'Hello World!'
+  )
+})

playground/ssr-deps/external-entry/entry.js

@@ -0,0 +1,9 @@
+// Module with state, to check that it is properly externalized and
+// not bundled in the optimized deps
+let msg
+export function setMessage(externalMsg) {
+  msg = externalMsg
+}
+export default function getMessage() {
+  return msg
+}

playground/ssr-deps/external-entry/index.js

@@ -0,0 +1 @@
+export default undefined

playground/ssr-deps/external-entry/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "external-entry",
+  "private": true,
+  "version": "0.0.0",
+  "exports": {
+    ".": "./index.js",
+    "./entry": "./entry.js"
+  },
+  "type": "module"
+}

playground/ssr-deps/external-using-external-entry/index.js

@@ -0,0 +1,7 @@
+import getMessage from 'external-entry/entry'
+
+export default {
+  hello() {
+    return getMessage()
+  }
+}

playground/ssr-deps/external-using-external-entry/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "external-using-external-entry",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "main": "index.js",
+  "dependencies": {
+    "external-entry": "file:../external-entry"
+  }
+}

playground/ssr-deps/package.json

@@ -24,7 +24,9 @@
     "no-external-css": "file:./no-external-css",
     "non-optimized-with-nested-external": "file:./non-optimized-with-nested-external",
     "optimized-with-nested-external": "file:./optimized-with-nested-external",
-    "optimized-cjs-with-nested-external": "file:./optimized-with-nested-external"
+    "optimized-cjs-with-nested-external": "file:./optimized-with-nested-external",
+    "external-using-external-entry": "file:./external-using-external-entry",
+    "external-entry": "file:./external-entry"
   },
   "devDependencies": {
     "cross-env": "^7.0.3",

playground/ssr-deps/server.js

@@ -35,8 +35,13 @@ export async function createServer(root = process.cwd(), hmrPort) {
     },
     appType: 'custom',
     ssr: {
-      noExternal: ['no-external-cjs', 'import-builtin-cjs', 'no-external-css'],
-      external: ['nested-external'],
+      noExternal: [
+        'no-external-cjs',
+        'import-builtin-cjs',
+        'no-external-css',
+        'external-entry'
+      ],
+      external: ['nested-external', 'external-entry/entry'],
       optimizeDeps: {
         disabled: 'build'
       }

playground/ssr-deps/src/app.js

@@ -20,6 +20,10 @@ import 'non-optimized-with-nested-external'
 import optimizedWithNestedExternal from 'optimized-with-nested-external'
 import optimizedCjsWithNestedExternal from 'optimized-cjs-with-nested-external'
 
+import { setMessage } from 'external-entry/entry'
+setMessage('Hello World!')
+import externalUsingExternalEntry from 'external-using-external-entry'
+
 export async function render(url, rootDir) {
   let html = ''
 
@@ -68,5 +72,8 @@ export async function render(url, rootDir) {
     optimizedCjsWithNestedExternal.hello()
   html += `\n<p class="optimized-cjs-with-nested-external">message from optimized-cjs-with-nested-external: ${optimizedCjsWithNestedExternalMessage}</p>`
 
+  const externalUsingExternalEntryMessage = externalUsingExternalEntry.hello()
+  html += `\n<p class="external-using-external-entry">message from external-using-external-entry: ${externalUsingExternalEntryMessage}</p>`
+
   return html + '\n'
 }