add comments

packages/next/src/build/webpack/plugins/flight-client-entry-plugin.ts

@@ -164,12 +164,13 @@ function deduplicateCSSImportsForEntry(mergedCSSimports: CssImports) {
   return dedupedCSSImports
 }
 
+// Collection of action module path and action names per runtime.
 type UsedActionMap = {
   node: Record<string, Set<string>>
   edge: Record<string, Set<string>>
 }
 type UsedActionPerEntry = {
-  [entryPath: string]: UsedActionMap
+  [entryName: string]: UsedActionMap
 }
 
 export class FlightClientEntryPlugin {
@@ -179,6 +180,8 @@ export class FlightClientEntryPlugin {
   isEdgeServer: boolean
   assetPrefix: string
   webpackRuntime: string
+
+  // Collect the used actions based on the entry name and runtime.
   usedActions: UsedActionPerEntry
 
   constructor(options: Options) {

test/production/app-dir/actions-tree-shaking/reexport/app/named-reexport/client/page.js

@@ -1,7 +1,7 @@
 'use client'
 
 import { useState } from 'react'
-import { sharedClientLayerAction } from './actions'
+import { sharedClientLayerAction } from './reexport-action'
 
 export default function Page() {
   const [text, setText] = useState('initial')

test/production/app-dir/actions-tree-shaking/reexport/reexport.test.ts

@@ -28,7 +28,7 @@ describe('actions-tree-shaking - reexport', () => {
         rsc: 3,
       },
       'app/named-reexport/client/page': {
-        'action-browser': 1,
+        'action-browser': 3,
       },
     })
   })