feat: support module-sync condition when loading config if enabled (#18650)

Author: sapphi-red

packages/vite/misc/false.d.ts

@@ -0,0 +1,2 @@
+declare const result: boolean
+export default result

packages/vite/misc/false.js

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

packages/vite/misc/true.d.ts

@@ -0,0 +1,2 @@
+declare const result: boolean
+export default result

packages/vite/misc/true.js

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

packages/vite/package.json

@@ -20,22 +20,14 @@
   "types": "./dist/node/index.d.ts",
   "exports": {
     ".": {
-      "import": {
-        "types": "./dist/node/index.d.ts",
-        "default": "./dist/node/index.js"
-      },
-      "require": {
-        "types": "./index.d.cts",
-        "default": "./index.cjs"
-      }
+      "module-sync": "./dist/node/index.js",
+      "import": "./dist/node/index.js",
+      "require": "./index.cjs"
     },
     "./client": {
       "types": "./client.d.ts"
     },
-    "./module-runner": {
-      "types": "./dist/node/module-runner.d.ts",
-      "import": "./dist/node/module-runner.js"
-    },
+    "./module-runner": "./dist/node/module-runner.js",
     "./dist/client/*": "./dist/client/*",
     "./types/*": {
       "types": "./types/*"
@@ -50,9 +42,16 @@
       ]
     }
   },
+  "imports": {
+    "#module-sync-enabled": {
+      "module-sync": "./misc/true.js",
+      "default": "./misc/false.js"
+    }
+  },
   "files": [
     "bin",
     "dist",
+    "misc/**/*.js",
     "client.d.ts",
     "index.cjs",
     "index.d.cts",

packages/vite/rollup.config.ts

@@ -112,6 +112,7 @@ const nodeConfig = defineConfig({
     'fsevents',
     'rollup/parseAst',
     /^tsx\//,
+    /^#/,
     ...Object.keys(pkg.dependencies),
     ...Object.keys(pkg.peerDependencies),
   ],

packages/vite/rollup.dts.config.ts

@@ -24,8 +24,8 @@ const external = [
 
 export default defineConfig({
   input: {
-    index: './temp/node/index.d.ts',
-    'module-runner': './temp/module-runner/index.d.ts',
+    index: './temp/src/node/index.d.ts',
+    'module-runner': './temp/src/module-runner/index.d.ts',
   },
   output: {
     dir: './dist/node',

packages/vite/src/node/config.ts

@@ -1703,6 +1703,9 @@ async function bundleConfigFile(
   fileName: string,
   isESM: boolean,
 ): Promise<{ code: string; dependencies: string[] }> {
+  const isModuleSyncConditionEnabled = (await import('#module-sync-enabled'))
+    .default
+
   const dirnameVarName = '__vite_injected_original_dirname'
   const filenameVarName = '__vite_injected_original_filename'
   const importMetaUrlVarName = '__vite_injected_original_import_meta_url'
@@ -1741,7 +1744,10 @@ async function bundleConfigFile(
               preferRelative: false,
               tryIndex: true,
               mainFields: [],
-              conditions: ['node'],
+              conditions: [
+                'node',
+                ...(isModuleSyncConditionEnabled ? ['module-sync'] : []),
+              ],
               externalConditions: [],
               external: [],
               noExternal: [],

packages/vite/tsconfig.base.json

@@ -1,5 +1,6 @@
 {
   "compilerOptions": {
+    "rootDir": ".",
     "target": "ES2022",
     "module": "ESNext",
     "moduleResolution": "Bundler",