feat(resolve): support subpath imports

packages/vite/package.json

@@ -110,7 +110,7 @@
     "postcss-import": "^15.0.0",
     "postcss-load-config": "^4.0.1",
     "postcss-modules": "^5.0.0",
-    "resolve.exports": "^1.1.0",
+    "resolve.exports": "npm:@alloc/resolve.exports@^1.1.0",
     "sirv": "^2.0.2",
     "source-map-js": "^1.0.2",
     "source-map-support": "^0.5.21",

packages/vite/src/node/config.ts

@@ -48,11 +48,7 @@ import {
   DEFAULT_MAIN_FIELDS,
   ENV_ENTRY
 } from './constants'
-import type {
-  InternalResolveOptions,
-  InternalResolveOptionsWithOverrideConditions,
-  ResolveOptions
-} from './plugins/resolve'
+import type { InternalResolveOptions, ResolveOptions } from './plugins/resolve'
 import { resolvePlugin, tryNodeResolve } from './plugins/resolve'
 import type { LogLevel, Logger } from './logger'
 import { createLogger } from './logger'
@@ -958,7 +954,7 @@ async function bundleConfigFile(
       {
         name: 'externalize-deps',
         setup(build) {
-          const options: InternalResolveOptionsWithOverrideConditions = {
+          const options: InternalResolveOptions = {
             root: path.dirname(fileName),
             isBuild: true,
             isProduction: true,
@@ -968,7 +964,7 @@ async function bundleConfigFile(
             mainFields: [],
             browserField: false,
             conditions: [],
-            overrideConditions: ['node'],
+            overrideConditions: ['node', 'require'],
             dedupe: [],
             extensions: DEFAULT_EXTENSIONS,
             preserveSymlinks: false

packages/vite/src/node/packages.ts

@@ -1,6 +1,6 @@
 import fs from 'node:fs'
 import path from 'node:path'
-import { createDebugger, createFilter, resolveFrom } from './utils'
+import { createDebugger, createFilter, lookupFile, resolveFrom } from './utils'
 import type { ResolvedConfig } from './config'
 import type { Plugin } from './plugin'
 
@@ -27,6 +27,7 @@ export interface PackageData {
     main: string
     module: string
     browser: string | Record<string, string | false>
+    imports: Record<string, any>
     exports: string | Record<string, any> | string[]
     dependencies: Record<string, string>
   }
@@ -131,6 +132,26 @@ export function loadPackageData(
   return pkg
 }
 
+export function loadNearestPackageData(
+  startDir: string,
+  options?: { preserveSymlinks?: boolean },
+  predicate?: (pkg: PackageData) => boolean
+): PackageData | null {
+  let importerPkg: PackageData | undefined
+  lookupFile(startDir, ['package.json'], {
+    pathOnly: true,
+    predicate(pkgPath) {
+      importerPkg = loadPackageData(pkgPath, options?.preserveSymlinks)
+      return !predicate || predicate(importerPkg)
+    }
+  })
+  return importerPkg || null
+}
+
+export function isNamedPackage(pkg: PackageData): boolean {
+  return !!pkg.data.name
+}
+
 export function watchPackageDataPlugin(config: ResolvedConfig): Plugin {
   const watchQueue = new Set<string>()
   let watchFile = (id: string) => {
@@ -163,3 +184,40 @@ export function watchPackageDataPlugin(config: ResolvedConfig): Plugin {
     }
   }
 }
+
+export function findPackageJson(dir: string): string | null {
+  // Stop looking at node_modules directory.
+  if (path.basename(dir) === 'node_modules') {
+    return null
+  }
+  const pkgPath = path.join(dir, 'package.json')
+  if (fs.existsSync(pkgPath)) {
+    return pkgPath
+  }
+  const parentDir = path.dirname(dir)
+  return parentDir !== dir ? findPackageJson(parentDir) : null
+}
+
+const workspaceRootFiles = ['lerna.json', 'pnpm-workspace.yaml', '.git']
+
+export function isWorkspaceRoot(
+  dir: string,
+  preserveSymlinks?: boolean,
+  packageCache?: PackageCache
+): boolean {
+  const files = fs.readdirSync(dir)
+  if (files.some((file) => workspaceRootFiles.includes(file))) {
+    return true // Found a lerna/pnpm workspace or git repository.
+  }
+  if (files.includes('package.json')) {
+    const workspacePkg = loadPackageData(
+      path.join(dir, 'package.json'),
+      preserveSymlinks,
+      packageCache
+    )
+    if (workspacePkg?.data.workspaces) {
+      return true // Found a npm/yarn workspace.
+    }
+  }
+  return false
+}