fix(ssr)!: don't access Object variable in ssr transformed code

package.json

@@ -72,7 +72,7 @@
     "typescript": "~5.7.2",
     "typescript-eslint": "^8.32.1",
     "vite": "workspace:*",
-    "vitest": "^3.1.4"
+    "vitest": "3.2.0-beta.3"
   },
   "simple-git-hooks": {
     "pre-commit": "pnpm exec lint-staged --concurrent false"

packages/vite/src/module-runner/constants.ts

@@ -3,4 +3,5 @@ export const ssrModuleExportsKey = `__vite_ssr_exports__`
 export const ssrImportKey = `__vite_ssr_import__`
 export const ssrDynamicImportKey = `__vite_ssr_dynamic_import__`
 export const ssrExportAllKey = `__vite_ssr_exportAll__`
+export const ssrExportNameKey = `__vite_ssr_exportName__`
 export const ssrImportMetaKey = `__vite_ssr_import_meta__`

packages/vite/src/module-runner/esmEvaluator.ts

@@ -5,6 +5,7 @@ import {
 import {
   ssrDynamicImportKey,
   ssrExportAllKey,
+  ssrExportNameKey,
   ssrImportKey,
   ssrImportMetaKey,
   ssrModuleExportsKey,
@@ -25,6 +26,7 @@ export class ESModulesEvaluator implements ModuleEvaluator {
       ssrImportKey,
       ssrDynamicImportKey,
       ssrExportAllKey,
+      ssrExportNameKey,
       // source map should already be inlined by Vite
       '"use strict";' + code,
     )
@@ -35,6 +37,7 @@ export class ESModulesEvaluator implements ModuleEvaluator {
       context[ssrImportKey],
       context[ssrDynamicImportKey],
       context[ssrExportAllKey],
+      context[ssrExportNameKey],
     )
 
     Object.seal(context[ssrModuleExportsKey])

packages/vite/src/module-runner/runner.ts

@@ -25,6 +25,7 @@ import {
 import {
   ssrDynamicImportKey,
   ssrExportAllKey,
+  ssrExportNameKey,
   ssrImportKey,
   ssrImportMetaKey,
   ssrModuleExportsKey,
@@ -405,6 +406,12 @@ export class ModuleRunner {
       [ssrDynamicImportKey]: dynamicRequest,
       [ssrModuleExportsKey]: exports,
       [ssrExportAllKey]: (obj: any) => exportAll(exports, obj),
+      [ssrExportNameKey]: (name, getter) =>
+        Object.defineProperty(exports, name, {
+          enumerable: true,
+          configurable: true,
+          get: getter,
+        }),
       [ssrImportMetaKey]: meta,
     }
 

packages/vite/src/module-runner/types.ts

@@ -15,6 +15,7 @@ import type { EvaluatedModuleNode, EvaluatedModules } from './evaluatedModules'
 import type {
   ssrDynamicImportKey,
   ssrExportAllKey,
+  ssrExportNameKey,
   ssrImportKey,
   ssrImportMetaKey,
   ssrModuleExportsKey,
@@ -38,6 +39,7 @@ export interface ModuleRunnerContext {
     options?: ImportCallOptions,
   ) => Promise<any>
   [ssrExportAllKey]: (obj: any) => void
+  [ssrExportNameKey]: (name: string, getter: () => unknown) => void
   [ssrImportMetaKey]: ModuleRunnerImportMeta
 }
 

packages/vite/src/node/ssr/__tests__/ssrLoadModule.spec.ts

@@ -235,7 +235,7 @@ test('json', async () => {
     null,
     '/test.json',
   )
-  expect(json?.code.length).toMatchInlineSnapshot(`225`)
+  expect(json?.code.length).toMatchInlineSnapshot(`165`)
 })
 
 test('file url', async () => {

packages/vite/src/node/ssr/__tests__/ssrTransform.spec.ts

@@ -67,7 +67,7 @@ test('export function declaration', async () => {
     await ssrTransformSimpleCode(`export function foo() {}`),
   ).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "foo", { enumerable: true, configurable: true, get(){ try { return foo } catch {} }});
+    "__vite_ssr_exportName__("foo", () => { try { return foo } catch {} });
     function foo() {}"
   `,
   )
@@ -78,7 +78,7 @@ test('export class declaration', async () => {
     await ssrTransformSimpleCode(`export class foo {}`),
   ).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "foo", { enumerable: true, configurable: true, get(){ try { return foo } catch {} }});
+    "__vite_ssr_exportName__("foo", () => { try { return foo } catch {} });
     class foo {}"
   `,
   )
@@ -89,8 +89,8 @@ test('export var declaration', async () => {
     await ssrTransformSimpleCode(`export const a = 1, b = 2`),
   ).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "a", { enumerable: true, configurable: true, get(){ try { return a } catch {} }});
-    Object.defineProperty(__vite_ssr_exports__, "b", { enumerable: true, configurable: true, get(){ try { return b } catch {} }});
+    "__vite_ssr_exportName__("a", () => { try { return a } catch {} });
+    __vite_ssr_exportName__("b", () => { try { return b } catch {} });
     const a = 1, b = 2"
   `,
   )
@@ -101,8 +101,8 @@ test('export named', async () => {
     await ssrTransformSimpleCode(`const a = 1, b = 2; export { a, b as c }`),
   ).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "a", { enumerable: true, configurable: true, get(){ try { return a } catch {} }});
-    Object.defineProperty(__vite_ssr_exports__, "c", { enumerable: true, configurable: true, get(){ try { return b } catch {} }});
+    "__vite_ssr_exportName__("a", () => { try { return a } catch {} });
+    __vite_ssr_exportName__("c", () => { try { return b } catch {} });
     const a = 1, b = 2; "
   `,
   )
@@ -113,8 +113,8 @@ test('export named from', async () => {
     await ssrTransformSimpleCode(`export { ref, computed as c } from 'vue'`),
   ).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "ref", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_0__.ref } catch {} }});
-    Object.defineProperty(__vite_ssr_exports__, "c", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_0__.computed } catch {} }});
+    "__vite_ssr_exportName__("ref", () => { try { return __vite_ssr_import_0__.ref } catch {} });
+    __vite_ssr_exportName__("c", () => { try { return __vite_ssr_import_0__.computed } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("vue", {"importedNames":["ref","computed"]});
     "
   `,
@@ -128,7 +128,7 @@ test('named exports of imported binding', async () => {
     ),
   ).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "createApp", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_0__.createApp } catch {} }});
+    "__vite_ssr_exportName__("createApp", () => { try { return __vite_ssr_import_0__.createApp } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("vue", {"importedNames":["createApp"]});
     "
   `,
@@ -155,7 +155,7 @@ test('export * as from', async () => {
     await ssrTransformSimpleCode(`export * as foo from 'vue'`),
   ).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "foo", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_0__ } catch {} }});
+    "__vite_ssr_exportName__("foo", () => { try { return __vite_ssr_import_0__ } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("vue");
     "
   `,
@@ -169,7 +169,7 @@ import * as foo from 'foo'
 export * as foo from 'foo'
 `),
   ).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "foo", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_1__ } catch {} }});
+    "__vite_ssr_exportName__("foo", () => { try { return __vite_ssr_import_1__ } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("foo");
     const __vite_ssr_import_1__ = await __vite_ssr_import__("foo");
 
@@ -183,7 +183,7 @@ import { foo } from 'foo'
 export { foo } from 'foo'
 `),
   ).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "foo", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_1__.foo } catch {} }});
+    "__vite_ssr_exportName__("foo", () => { try { return __vite_ssr_import_1__.foo } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("foo", {"importedNames":["foo"]});
     const __vite_ssr_import_1__ = await __vite_ssr_import__("foo", {"importedNames":["foo"]});
 
@@ -197,7 +197,7 @@ import { foo } from 'foo'
 export { foo as foo } from 'foo'
 `),
   ).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "foo", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_1__.foo } catch {} }});
+    "__vite_ssr_exportName__("foo", () => { try { return __vite_ssr_import_1__.foo } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("foo", {"importedNames":["foo"]});
     const __vite_ssr_import_1__ = await __vite_ssr_import__("foo", {"importedNames":["foo"]});
 
@@ -211,7 +211,7 @@ test('export * as from arbitrary module namespace identifier', async () => {
     await ssrTransformSimpleCode(`export * as "arbitrary string" from 'vue'`),
   ).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "arbitrary string", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_0__ } catch {} }});
+    "__vite_ssr_exportName__("arbitrary string", () => { try { return __vite_ssr_import_0__ } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("vue");
     "
   `,
@@ -225,7 +225,7 @@ test('export as arbitrary module namespace identifier', async () => {
     ),
   ).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "arbitrary string", { enumerable: true, configurable: true, get(){ try { return something } catch {} }});
+    "__vite_ssr_exportName__("arbitrary string", () => { try { return something } catch {} });
     const something = "Something";"
   `,
   )
@@ -238,7 +238,7 @@ test('export as from arbitrary module namespace identifier', async () => {
     ),
   ).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "arbitrary string", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_0__["arbitrary string2"] } catch {} }});
+    "__vite_ssr_exportName__("arbitrary string", () => { try { return __vite_ssr_import_0__["arbitrary string2"] } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("vue", {"importedNames":["arbitrary string2"]});
     "
   `,
@@ -248,7 +248,7 @@ test('export as from arbitrary module namespace identifier', async () => {
 test('export default', async () => {
   expect(await ssrTransformSimpleCode(`export default {}`))
     .toMatchInlineSnapshot(`
-      "Object.defineProperty(__vite_ssr_exports__, "default", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_export_default__ } catch {} }});
+      "__vite_ssr_exportName__("default", () => { try { return __vite_ssr_export_default__ } catch {} });
       const __vite_ssr_export_default__ = {}"
     `)
 })
@@ -306,7 +306,7 @@ test('dynamic import', async () => {
   )
   expect(result?.code).toMatchInlineSnapshot(
     `
-    "Object.defineProperty(__vite_ssr_exports__, "i", { enumerable: true, configurable: true, get(){ try { return i } catch {} }});
+    "__vite_ssr_exportName__("i", () => { try { return i } catch {} });
     const i = () => __vite_ssr_dynamic_import__('./foo')"
   `,
   )
@@ -506,8 +506,8 @@ test('should declare variable for imported super class', async () => {
         `export class B extends Foo {}`,
     ),
   ).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "default", { enumerable: true, configurable: true, get(){ try { return A } catch {} }});
-    Object.defineProperty(__vite_ssr_exports__, "B", { enumerable: true, configurable: true, get(){ try { return B } catch {} }});
+    "__vite_ssr_exportName__("default", () => { try { return A } catch {} });
+    __vite_ssr_exportName__("B", () => { try { return B } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("./dependency", {"importedNames":["Foo"]});
     const Foo = __vite_ssr_import_0__.Foo;
     class A extends Foo {};
@@ -520,14 +520,14 @@ test('should handle default export variants', async () => {
   // default anonymous functions
   expect(await ssrTransformSimpleCode(`export default function() {}\n`))
     .toMatchInlineSnapshot(`
-      "Object.defineProperty(__vite_ssr_exports__, "default", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_export_default__ } catch {} }});
+      "__vite_ssr_exportName__("default", () => { try { return __vite_ssr_export_default__ } catch {} });
       const __vite_ssr_export_default__ = function() {}
       "
     `)
   // default anonymous class
   expect(await ssrTransformSimpleCode(`export default class {}\n`))
     .toMatchInlineSnapshot(`
-      "Object.defineProperty(__vite_ssr_exports__, "default", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_export_default__ } catch {} }});
+      "__vite_ssr_exportName__("default", () => { try { return __vite_ssr_export_default__ } catch {} });
       const __vite_ssr_export_default__ = class {}
       "
     `)
@@ -538,7 +538,7 @@ test('should handle default export variants', async () => {
         `foo.prototype = Object.prototype;`,
     ),
   ).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "default", { enumerable: true, configurable: true, get(){ try { return foo } catch {} }});
+    "__vite_ssr_exportName__("default", () => { try { return foo } catch {} });
     function foo() {};
     foo.prototype = Object.prototype;"
   `)
@@ -548,8 +548,8 @@ test('should handle default export variants', async () => {
       `export default class A {}\n` + `export class B extends A {}`,
     ),
   ).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "default", { enumerable: true, configurable: true, get(){ try { return A } catch {} }});
-    Object.defineProperty(__vite_ssr_exports__, "B", { enumerable: true, configurable: true, get(){ try { return B } catch {} }});
+    "__vite_ssr_exportName__("default", () => { try { return A } catch {} });
+    __vite_ssr_exportName__("B", () => { try { return B } catch {} });
     class A {};
     class B extends A {}"
   `)
@@ -1001,8 +1001,8 @@ export function fn1() {
         `,
     ),
   ).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "fn1", { enumerable: true, configurable: true, get(){ try { return fn1 } catch {} }});
-    Object.defineProperty(__vite_ssr_exports__, "fn2", { enumerable: true, configurable: true, get(){ try { return fn2 } catch {} }});
+    "__vite_ssr_exportName__("fn1", () => { try { return fn1 } catch {} });
+    __vite_ssr_exportName__("fn2", () => { try { return fn2 } catch {} });
 
     function fn1() {
     };function fn2() {
@@ -1024,15 +1024,15 @@ export default (function getRandom() {
 `.trim()
 
   expect(await ssrTransformSimpleCode(code)).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "default", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_export_default__ } catch {} }});
+    "__vite_ssr_exportName__("default", () => { try { return __vite_ssr_export_default__ } catch {} });
     const __vite_ssr_export_default__ = (function getRandom() {
       return Math.random();
     });"
   `)
 
   expect(await ssrTransformSimpleCode(`export default (class A {});`))
     .toMatchInlineSnapshot(`
-      "Object.defineProperty(__vite_ssr_exports__, "default", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_export_default__ } catch {} }});
+      "__vite_ssr_exportName__("default", () => { try { return __vite_ssr_export_default__ } catch {} });
       const __vite_ssr_export_default__ = (class A {});"
     `)
 })
@@ -1110,7 +1110,7 @@ export class Test {
 };`.trim()
 
   expect(await ssrTransformSimpleCode(code)).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "Test", { enumerable: true, configurable: true, get(){ try { return Test } catch {} }});
+    "__vite_ssr_exportName__("Test", () => { try { return Test } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("foobar", {"importedNames":["foo","bar"]});
 
     if (false) {
@@ -1309,8 +1309,8 @@ export * as bar from './bar'
 console.log(bar)
   `),
   ).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "default", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_export_default__ } catch {} }});
-    Object.defineProperty(__vite_ssr_exports__, "bar", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_1__ } catch {} }});
+    "__vite_ssr_exportName__("default", () => { try { return __vite_ssr_export_default__ } catch {} });
+    __vite_ssr_exportName__("bar", () => { try { return __vite_ssr_import_1__ } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("./foo", {"importedNames":["foo"]});
     const __vite_ssr_import_1__ = await __vite_ssr_import__("./bar");
     ;
@@ -1585,9 +1585,9 @@ import("e")
 export * as A from "a";
 `)
   expect(result?.code).toMatchInlineSnapshot(`
-    "Object.defineProperty(__vite_ssr_exports__, "b", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_1__.b } catch {} }});
-    Object.defineProperty(__vite_ssr_exports__, "d", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_3__ } catch {} }});
-    Object.defineProperty(__vite_ssr_exports__, "A", { enumerable: true, configurable: true, get(){ try { return __vite_ssr_import_4__ } catch {} }});
+    "__vite_ssr_exportName__("b", () => { try { return __vite_ssr_import_1__.b } catch {} });
+    __vite_ssr_exportName__("d", () => { try { return __vite_ssr_import_3__ } catch {} });
+    __vite_ssr_exportName__("A", () => { try { return __vite_ssr_import_4__ } catch {} });
     const __vite_ssr_import_0__ = await __vite_ssr_import__("a", {"importedNames":["default"]});
     const __vite_ssr_import_1__ = await __vite_ssr_import__("b", {"importedNames":["b"]});
     const __vite_ssr_import_2__ = await __vite_ssr_import__("c");

packages/vite/src/node/ssr/runtime/__tests__/fixtures/top-level-object.js

@@ -0,0 +1,2 @@
+const Object = "my-object";
+export { Object };

packages/vite/src/node/ssr/runtime/__tests__/server-runtime.spec.ts

@@ -390,6 +390,15 @@ describe('module runner initialization', async () => {
     `,
     )
   })
+
+  it(`handle Object variable`, async ({ runner }) => {
+    const mod = await runner.import('/fixtures/top-level-object.js')
+    expect(mod).toMatchInlineSnapshot(`
+      {
+        "Object": "my-object",
+      }
+    `)
+  })
 })
 
 describe('optimize-deps', async () => {

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

@@ -43,6 +43,7 @@ export const ssrModuleExportsKey = `__vite_ssr_exports__`
 export const ssrImportKey = `__vite_ssr_import__`
 export const ssrDynamicImportKey = `__vite_ssr_dynamic_import__`
 export const ssrExportAllKey = `__vite_ssr_exportAll__`
+export const ssrExportNameKey = `__vite_ssr_exportName__`
 export const ssrImportMetaKey = `__vite_ssr_import_meta__`
 
 const hashbangRE = /^#!.*\n/
@@ -156,8 +157,7 @@ async function ssrTransformScript(
     // wrap with try/catch to fallback to `undefined` for backward compat.
     s.appendLeft(
       fileStartIndex,
-      `Object.defineProperty(${ssrModuleExportsKey}, ${JSON.stringify(name)}, ` +
-        `{ enumerable: true, configurable: true, get(){ try { return ${local} } catch {} }});\n`,
+      `${ssrExportNameKey}(${JSON.stringify(name)}, () => { try { return ${local} } catch {} });\n`,
     )
   }