diff --git a/packages/vite/src/node/optimizer/index.ts b/packages/vite/src/node/optimizer/index.ts
index ebc7e3c350638f..6ae227d5db156f 100644
--- a/packages/vite/src/node/optimizer/index.ts
+++ b/packages/vite/src/node/optimizer/index.ts
@@ -822,15 +822,6 @@ async function prepareEsbuildOptimizerRun(
   return { context, idToExports }
 }
 
-export async function findKnownImports(
-  config: ResolvedConfig,
-  ssr: boolean,
-): Promise<string[]> {
-  const { deps } = await scanImports(config).result
-  await addManuallyIncludedOptimizeDeps(deps, config, ssr)
-  return Object.keys(deps)
-}
-
 export async function addManuallyIncludedOptimizeDeps(
   deps: Record<string, string>,
   config: ResolvedConfig,
diff --git a/packages/vite/src/node/server/index.ts b/packages/vite/src/node/server/index.ts
index aaa96677aff2a3..da9bb062f3602d 100644
--- a/packages/vite/src/node/server/index.ts
+++ b/packages/vite/src/node/server/index.ts
@@ -289,11 +289,6 @@ export interface ViteDevServer {
    * @internal
    */
   _importGlobMap: Map<string, { affirmed: string[]; negated: string[] }[]>
-  /**
-   * Deps that are externalized
-   * @internal
-   */
-  _ssrExternals: string[] | null
   /**
    * @internal
    */
@@ -504,7 +499,6 @@ export async function _createServer(
       return server._restartPromise
     },
 
-    _ssrExternals: null,
     _restartPromise: null,
     _importGlobMap: new Map(),
     _forceOptimizeOnRestart: false,
diff --git a/packages/vite/src/node/ssr/__tests__/ssrExternal.spec.ts b/packages/vite/src/node/ssr/__tests__/ssrExternal.spec.ts
deleted file mode 100644
index 579ba997da5272..00000000000000
--- a/packages/vite/src/node/ssr/__tests__/ssrExternal.spec.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-import { expect, test } from 'vitest'
-import { stripNesting } from '../ssrExternal'
-
-test('stripNesting', async () => {
-  expect(stripNesting(['c', 'p1>c1', 'p2 > c2'])).toEqual(['c', 'c1', 'c2'])
-})
diff --git a/packages/vite/src/node/ssr/ssrExternal.ts b/packages/vite/src/node/ssr/ssrExternal.ts
index 81377160d06dc2..9ee38434c18a16 100644
--- a/packages/vite/src/node/ssr/ssrExternal.ts
+++ b/packages/vite/src/node/ssr/ssrExternal.ts
@@ -12,16 +12,6 @@ import type { ResolvedConfig } from '..'
 
 const debug = createDebugger('vite:ssr-external')
 
-/**
- * Converts "parent > child" syntax to just "child"
- */
-export function stripNesting(packages: string[]): string[] {
-  return packages.map((s) => {
-    const arr = s.split('>')
-    return arr[arr.length - 1].trim()
-  })
-}
-
 const isSsrExternalCache = new WeakMap<
   ResolvedConfig,
   (id: string, importer?: string) => boolean | undefined