fix(resolve): use only root package.json as exports source

packages/vite/src/node/plugins/resolve.ts

@@ -654,12 +654,21 @@ export function tryNodeResolve(
     basedir = nestedResolveFrom(nestedRoot, basedir, preserveSymlinks)
   }
 
+  let pkg: PackageData | undefined
+  let pkgId: string | undefined
   // nearest package.json
   let nearestPkg: PackageData | undefined
-  // nearest package.json that may have the `exports` field
-  let pkg: PackageData | undefined
 
-  let pkgId = possiblePkgIds.reverse().find((pkgId) => {
+  const rootPkgId = possiblePkgIds[0]
+
+  const rootPkg = resolvePackageData(
+    rootPkgId,
+    basedir,
+    preserveSymlinks,
+    packageCache,
+  )!
+
+  const nearestPkgId = [...possiblePkgIds].reverse().find((pkgId) => {
     nearestPkg = resolvePackageData(
       pkgId,
       basedir,
@@ -669,17 +678,11 @@ export function tryNodeResolve(
     return nearestPkg
   })!
 
-  const rootPkgId = possiblePkgIds[0]
-  const rootPkg = resolvePackageData(
-    rootPkgId,
-    basedir,
-    preserveSymlinks,
-    packageCache,
-  )!
   if (rootPkg?.data?.exports) {
-    pkg = rootPkg
     pkgId = rootPkgId
+    pkg = rootPkg
   } else {
+    pkgId = nearestPkgId
     pkg = nearestPkg
   }
 

playground/resolve/__tests__/resolve.spec.ts

@@ -9,6 +9,12 @@ test('deep import', async () => {
   expect(await page.textContent('.deep-import')).toMatch('[2,4]')
 })
 
+test('exports and a nested package scope with a different type', async () => {
+  expect(await page.textContent('.exports-and-nested-scope')).toMatch(
+    '[success]',
+  )
+})
+
 test('entry with exports field', async () => {
   expect(await page.textContent('.exports-entry')).toMatch('[success]')
 })
@@ -36,6 +42,10 @@ test('deep import with exports field + mapped dir', async () => {
   )
 })
 
+test('exports read from the root package.json', async () => {
+  expect(await page.textContent('.exports-from-root')).toMatch('[success]')
+})
+
 // this is how Svelte 3 is packaged
 test('deep import with exports and legacy fallback', async () => {
   expect(await page.textContent('.exports-legacy-fallback')).toMatch(

playground/resolve/exports-and-nested-scope/nested-scope/file.js

@@ -0,0 +1,4 @@
+'use strict'
+
+// intentionally use the default export here since default import from CJS has different semantics in node
+export default '[success] ES .js file within root that has type: commonjs (thanks to a package scope)'

playground/resolve/exports-and-nested-scope/nested-scope/package.json

@@ -0,0 +1,4 @@
+{
+  "private": true,
+  "type": "module"
+}

playground/resolve/exports-and-nested-scope/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "@vitejs/test-resolve-exports-and-nested-scope",
+  "private": true,
+  "version": "1.0.0",
+  "type": "commonjs",
+  "exports": {
+    ".": "./index.js",
+    "./nested": "./nested-scope/file.js"
+  }
+}

playground/resolve/exports-from-root/file.js

@@ -0,0 +1 @@
+export const msg = '[success] exports from root (./file.js)'

playground/resolve/exports-from-root/nested/file.js

@@ -0,0 +1 @@
+export const msg = 'fail exports from root (./nested/file.js)'

playground/resolve/exports-from-root/nested/package.json

@@ -0,0 +1,5 @@
+{
+  "exports": {
+    ".": "./file.js"
+  }
+}

playground/resolve/exports-from-root/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "@vitejs/test-resolve-exports-from-root",
+  "private": true,
+  "version": "1.0.0",
+  "exports": {
+    ".": "./index.js",
+    "./nested": "./file.js"
+  }
+}

playground/resolve/index.html

@@ -6,6 +6,9 @@ <h2>Utf8-bom import</h2>
 <h2>Deep import</h2>
 <p>Should show [2,4]:<span class="pre deep-import">fail</span></p>
 
+<h2>Exports and a nested package scope with a different type</h2>
+<p class="exports-and-nested-scope">fail</p>
+
 <h2>Entry resolving with exports field</h2>
 <p class="exports-entry">fail</p>
 
@@ -24,6 +27,9 @@ <h2>Deep import with exports field + mapped directory</h2>
 <h2>Exports field env priority</h2>
 <p class="exports-env">fail</p>
 
+<h2>Exports field read only from the root package.json</h2>
+<p class="exports-from-root">fail</p>
+
 <h2>Exports with legacy fallback</h2>
 <p class="exports-legacy-fallback">fail</p>
 
@@ -143,6 +149,9 @@ <h2>resolve package that contains # in path</h2>
 
   text('.deep-import', JSON.stringify(slicedToArray(iterable, 2)))
 
+  import exportsAndNestedScopeMsg from '@vitejs/test-resolve-exports-and-nested-scope/nested'
+  text('.exports-and-nested-scope', exportsAndNestedScopeMsg)
+
   // exports field
   import { msg } from '@vitejs/test-resolve-exports-path'
   text('.exports-entry', msg)
@@ -166,6 +175,9 @@ <h2>resolve package that contains # in path</h2>
   import { msg as exportsEnvMsg } from '@vitejs/test-resolve-exports-env'
   text('.exports-env', exportsEnvMsg)
 
+  import { msg as exportsFromRootMsg } from '@vitejs/test-resolve-exports-from-root/nested'
+  text('.exports-from-root', exportsFromRootMsg)
+
   import { msg as exportsLegacyFallbackMsg } from '@vitejs/test-resolve-exports-legacy-fallback/dir'
   text('.exports-legacy-fallback', exportsLegacyFallbackMsg)
 

playground/resolve/package.json

@@ -19,7 +19,9 @@
     "@vitejs/test-resolve-browser-module-field3": "link:./browser-module-field3",
     "@vitejs/test-resolve-custom-condition": "link:./custom-condition",
     "@vitejs/test-resolve-custom-main-field": "link:./custom-main-field",
+    "@vitejs/test-resolve-exports-and-nested-scope": "link:./exports-and-nested-scope",
     "@vitejs/test-resolve-exports-env": "link:./exports-env",
+    "@vitejs/test-resolve-exports-from-root": "link:./exports-from-root",
     "@vitejs/test-resolve-exports-legacy-fallback": "link:./exports-legacy-fallback",
     "@vitejs/test-resolve-exports-path": "link:./exports-path",
     "@vitejs/test-resolve-linked": "workspace:*"