diff --git a/packages/browser/rollup.config.js b/packages/browser/rollup.config.js
index 82eb3a945..5286fac12 100644
--- a/packages/browser/rollup.config.js
+++ b/packages/browser/rollup.config.js
@@ -13,6 +13,7 @@ const external = [
   ...Object.keys(pkg.dependencies),
   ...Object.keys(pkg.peerDependencies || {}),
   /^@?vitest(\/|$)/,
+  '@vitest/browser/utils',
   'worker_threads',
   'node:worker_threads',
   'vite',
@@ -98,6 +99,7 @@ export default () =>
         file: 'dist/context.js',
         format: 'esm',
       },
+      external: ['@vitest/browser/utils'],
       plugins: [
         oxc({
           transform: { target: 'node18' },
diff --git a/packages/browser/src/client/tester/logger.ts b/packages/browser/src/client/tester/logger.ts
index 51d760222..88ebb4cef 100644
--- a/packages/browser/src/client/tester/logger.ts
+++ b/packages/browser/src/client/tester/logger.ts
@@ -1,4 +1,4 @@
-import { format, stringify } from 'vitest/utils'
+import { format, stringify } from 'vitest/internal/browser'
 import { getConfig } from '../utils'
 import { rpc } from './rpc'
 import { getBrowserRunner } from './runner'
diff --git a/packages/browser/src/client/tester/public-utils.ts b/packages/browser/src/client/tester/public-utils.ts
index 3626c83e3..241638f73 100644
--- a/packages/browser/src/client/tester/public-utils.ts
+++ b/packages/browser/src/client/tester/public-utils.ts
@@ -1,8 +1,8 @@
 import type { Locator, LocatorSelectors } from '@vitest/browser/context'
-import type { StringifyOptions } from 'vitest/utils'
+import type { StringifyOptions } from 'vitest/internal/browser'
 import { page } from '@vitest/browser/context'
 import { asLocator } from 'ivya'
-import { stringify } from 'vitest/utils'
+import { stringify } from 'vitest/internal/browser'
 
 export function getElementLocatorSelectors(element: Element): LocatorSelectors {
   const locator = page.elementLocator(element)
diff --git a/packages/browser/src/client/tester/rpc.ts b/packages/browser/src/client/tester/rpc.ts
index ff3e1f413..cbf6ec119 100644
--- a/packages/browser/src/client/tester/rpc.ts
+++ b/packages/browser/src/client/tester/rpc.ts
@@ -1,5 +1,5 @@
 import type { VitestBrowserClient } from '@vitest/browser/client'
-import { getSafeTimers } from 'vitest/utils'
+import { getSafeTimers } from 'vitest/internal/browser'
 
 const { get } = Reflect
 
diff --git a/packages/browser/src/client/tester/runner.ts b/packages/browser/src/client/tester/runner.ts
index a877aad77..07da626e3 100644
--- a/packages/browser/src/client/tester/runner.ts
+++ b/packages/browser/src/client/tester/runner.ts
@@ -4,9 +4,14 @@ import type { VitestExecutor } from 'vitest/execute'
 import type { VitestBrowserClientMocker } from './mocker'
 import { globalChannel, onCancel } from '@vitest/browser/client'
 import { page, userEvent } from '@vitest/browser/context'
-import { loadDiffConfig, loadSnapshotSerializers, takeCoverageInsideWorker } from 'vitest/browser'
+import {
+  loadDiffConfig,
+  loadSnapshotSerializers,
+  originalPositionFor,
+  takeCoverageInsideWorker,
+  TraceMap,
+} from 'vitest/internal/browser'
 import { NodeBenchmarkRunner, VitestTestRunner } from 'vitest/runners'
-import { originalPositionFor, TraceMap } from 'vitest/utils'
 import { createStackString, parseStacktrace } from '../../../../utils/src/source-map'
 import { executor, getWorkerState } from '../utils'
 import { rpc } from './rpc'
diff --git a/packages/browser/src/client/tester/snapshot.ts b/packages/browser/src/client/tester/snapshot.ts
index b0785a6d6..e2042df84 100644
--- a/packages/browser/src/client/tester/snapshot.ts
+++ b/packages/browser/src/client/tester/snapshot.ts
@@ -1,7 +1,7 @@
 import type { VitestBrowserClient } from '@vitest/browser/client'
+import type { ParsedStack } from 'vitest/internal/browser'
 import type { SnapshotEnvironment } from 'vitest/snapshot'
-import type { ParsedStack } from 'vitest/utils'
-import { originalPositionFor, TraceMap } from 'vitest/utils'
+import { originalPositionFor, TraceMap } from 'vitest/internal/browser'
 
 export class VitestBrowserSnapshotEnvironment implements SnapshotEnvironment {
   private sourceMaps = new Map<string, any>()
diff --git a/packages/browser/src/client/tester/tester.ts b/packages/browser/src/client/tester/tester.ts
index 44e7abb97..a7ec2a805 100644
--- a/packages/browser/src/client/tester/tester.ts
+++ b/packages/browser/src/client/tester/tester.ts
@@ -9,7 +9,7 @@ import {
   startCoverageInsideWorker,
   startTests,
   stopCoverageInsideWorker,
-} from 'vitest/browser'
+} from 'vitest/internal/browser'
 import { executor, getBrowserState, getConfig, getWorkerState } from '../utils'
 import { setupDialogsSpy } from './dialog'
 import { setupConsoleLogSpy } from './logger'
diff --git a/packages/browser/src/node/plugin.ts b/packages/browser/src/node/plugin.ts
index d1f75d3a9..987785ce0 100644
--- a/packages/browser/src/node/plugin.ts
+++ b/packages/browser/src/node/plugin.ts
@@ -190,8 +190,7 @@ export default (parentServer: ParentBrowserProject, base = '/'): Plugin[] => {
 
         const exclude = [
           'vitest',
-          'vitest/utils',
-          'vitest/browser',
+          'vitest/internal/browser',
           'vitest/runners',
           '@vitest/browser',
           '@vitest/browser/client',
diff --git a/packages/browser/utils.d.ts b/packages/browser/utils.d.ts
index 9a78b236f..cd62022af 100644
--- a/packages/browser/utils.d.ts
+++ b/packages/browser/utils.d.ts
@@ -3,7 +3,7 @@
 // fortunately, the file is quite small
 
 import { LocatorSelectors, Locator } from '@vitest/browser/context'
-import { StringifyOptions } from 'vitest/utils'
+import { StringifyOptions } from 'vitest/internal/browser'
 
 export type PrettyDOMOptions = Omit<StringifyOptions, 'maxLength'>
 
diff --git a/packages/utils/src/display.ts b/packages/utils/src/display.ts
index a538d6a9e..d374966d2 100644
--- a/packages/utils/src/display.ts
+++ b/packages/utils/src/display.ts
@@ -21,7 +21,7 @@ interface Options {
   stylize: (value: string, styleType: string) => string
 }
 
-type LoupeOptions = Partial<Options>
+export type LoupeOptions = Partial<Options>
 
 const {
   AsymmetricMatcher,
diff --git a/packages/utils/src/index.ts b/packages/utils/src/index.ts
index cdf049c5a..d7d9c9d18 100644
--- a/packages/utils/src/index.ts
+++ b/packages/utils/src/index.ts
@@ -4,7 +4,7 @@ export {
   objDisplay,
   stringify,
 } from './display'
-export type { StringifyOptions } from './display'
+export type { LoupeOptions, StringifyOptions } from './display'
 
 export {
   assertTypes,
diff --git a/packages/vitest/package.json b/packages/vitest/package.json
index 41fdcf2f9..22b61b8a1 100644
--- a/packages/vitest/package.json
+++ b/packages/vitest/package.json
@@ -58,7 +58,7 @@
       "types": "./dist/workers.d.ts",
       "import": "./dist/workers.js"
     },
-    "./browser": {
+    "./internal/browser": {
       "types": "./dist/browser.d.ts",
       "default": "./dist/browser.js"
     },
@@ -74,10 +74,6 @@
       "types": "./dist/environments.d.ts",
       "default": "./dist/environments.js"
     },
-    "./utils": {
-      "types": "./dist/utils.d.ts",
-      "default": "./dist/utils.js"
-    },
     "./config": {
       "types": "./config.d.ts",
       "require": "./dist/config.cjs",
diff --git a/packages/vitest/rollup.config.js b/packages/vitest/rollup.config.js
index f2ad94aff..43859fd8f 100644
--- a/packages/vitest/rollup.config.js
+++ b/packages/vitest/rollup.config.js
@@ -28,7 +28,6 @@ const entries = {
   'mocker': 'src/public/mocker.ts',
   'spy': 'src/integrations/spy.ts',
   'coverage': 'src/public/coverage.ts',
-  'utils': 'src/public/utils.ts',
   'execute': 'src/public/execute.ts',
   'reporters': 'src/public/reporters.ts',
   // TODO: advanced docs
@@ -55,7 +54,6 @@ const dtsEntries = {
   suite: 'src/public/suite.ts',
   config: 'src/public/config.ts',
   coverage: 'src/public/coverage.ts',
-  utils: 'src/public/utils.ts',
   execute: 'src/public/execute.ts',
   reporters: 'src/public/reporters.ts',
   mocker: 'src/public/mocker.ts',
diff --git a/packages/vitest/src/integrations/run-once.ts b/packages/vitest/src/integrations/run-once.ts
deleted file mode 100644
index cb22304d3..000000000
--- a/packages/vitest/src/integrations/run-once.ts
+++ /dev/null
@@ -1,52 +0,0 @@
-import { getWorkerState } from '../runtime/utils'
-
-const filesCount = new Map<string, number>()
-const cache = new Map<string, any>()
-
-/**
- * This utils allows computational intensive tasks to only be ran once
- * across test reruns to improve the watch mode performance.
- *
- * Currently only works with `poolOptions.<pool>.isolate: false`
- *
- * @experimental
- */
-export function runOnce<T>(fn: () => T, key?: string): T {
-  const filepath = getWorkerState().filepath || '__unknown_files__'
-
-  if (!key) {
-    filesCount.set(filepath, (filesCount.get(filepath) || 0) + 1)
-    key = String(filesCount.get(filepath)!)
-  }
-
-  const id = `${filepath}:${key}`
-
-  if (!cache.has(id)) {
-    cache.set(id, fn())
-  }
-
-  return cache.get(id)
-}
-
-/**
- * Get a boolean indicates whether the task is running in the first time.
- * Could only be `false` in watch mode.
- *
- * Currently only works with `isolate: false`
- *
- * @experimental
- */
-export function isFirstRun(): boolean {
-  let firstRun = false
-  runOnce(() => {
-    firstRun = true
-  }, '__vitest_first_run__')
-  return firstRun
-}
-
-/**
- * @internal
- */
-export function resetRunOnceCounter() {
-  filesCount.clear()
-}
diff --git a/packages/vitest/src/integrations/utils.ts b/packages/vitest/src/integrations/utils.ts
deleted file mode 100644
index 3210c5cbf..000000000
--- a/packages/vitest/src/integrations/utils.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-// Runtime utils exposed to `vitest`
-
-export function getRunningMode(): 'watch' | 'run' {
-  return process.env.VITEST_MODE === 'WATCH' ? 'watch' : 'run'
-}
-
-export function isWatchMode(): boolean {
-  return getRunningMode() === 'watch'
-}
diff --git a/packages/vitest/src/node/test-run.ts b/packages/vitest/src/node/test-run.ts
index 3760f45ae..f319a5ec9 100644
--- a/packages/vitest/src/node/test-run.ts
+++ b/packages/vitest/src/node/test-run.ts
@@ -1,5 +1,5 @@
 import type { File as RunnerTestFile, TaskEventPack, TaskResultPack, TaskUpdateEvent } from '@vitest/runner'
-import type { SerializedError } from '../public/utils'
+import type { SerializedError } from '@vitest/utils'
 import type { UserConsoleLog } from '../types/general'
 import type { Vitest } from './core'
 import type { TestProject } from './project'
diff --git a/packages/vitest/src/public/browser.ts b/packages/vitest/src/public/browser.ts
index f49d115e8..b10a669d5 100644
--- a/packages/vitest/src/public/browser.ts
+++ b/packages/vitest/src/public/browser.ts
@@ -11,3 +11,14 @@ export {
 } from '../runtime/setup-common'
 export { collectTests, processError, startTests } from '@vitest/runner'
 export * as SpyModule from '@vitest/spy'
+export {
+  format,
+  getSafeTimers,
+  inspect,
+  stringify,
+} from '@vitest/utils'
+export type { LoupeOptions, ParsedStack, StringifyOptions } from '@vitest/utils'
+export {
+  originalPositionFor,
+  TraceMap,
+} from '@vitest/utils/source-map'
diff --git a/packages/vitest/src/public/index.ts b/packages/vitest/src/public/index.ts
index db9a995b1..05d2c4b20 100644
--- a/packages/vitest/src/public/index.ts
+++ b/packages/vitest/src/public/index.ts
@@ -107,9 +107,7 @@ export type {
 } from '../api/types'
 export { assert, chai, createExpect, expect, should } from '../integrations/chai'
 export { inject } from '../integrations/inject'
-export { isFirstRun, runOnce } from '../integrations/run-once'
 
-export { getRunningMode, isWatchMode } from '../integrations/utils'
 export { vi, vitest } from '../integrations/vi'
 export type { VitestUtils } from '../integrations/vi'
 export { bench } from '../runtime/benchmark'
diff --git a/packages/vitest/src/public/utils.ts b/packages/vitest/src/public/utils.ts
deleted file mode 100644
index 29670bc5c..000000000
--- a/packages/vitest/src/public/utils.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-export * from '@vitest/utils'
-export * from '@vitest/utils/source-map'
diff --git a/packages/vitest/src/runtime/setup-common.ts b/packages/vitest/src/runtime/setup-common.ts
index ccea2fbda..7af812f99 100644
--- a/packages/vitest/src/runtime/setup-common.ts
+++ b/packages/vitest/src/runtime/setup-common.ts
@@ -5,11 +5,9 @@ import type { SerializedConfig } from './config'
 import type { VitestExecutor } from './execute'
 import { addSerializer } from '@vitest/snapshot'
 import { setSafeTimers } from '@vitest/utils'
-import { resetRunOnceCounter } from '../integrations/run-once'
 
 let globalSetup = false
 export async function setupCommonEnv(config: SerializedConfig): Promise<void> {
-  resetRunOnceCounter()
   setupDefines(config.defines)
   setupEnv(config.env)
 
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 0b3f851bd..1b4dec74a 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1312,6 +1312,9 @@ importers:
       vitest-environment-custom:
         specifier: file:./vitest-environment-custom
         version: file:test/core/vitest-environment-custom
+      vitest-package-exports:
+        specifier: ^0.1.1
+        version: 0.1.1
       vue:
         specifier: 'catalog:'
         version: 3.5.12(typescript@5.8.3)
@@ -9075,6 +9078,9 @@ packages:
   vitest-environment-custom@file:test/core/vitest-environment-custom:
     resolution: {directory: test/core/vitest-environment-custom, type: directory}
 
+  vitest-package-exports@0.1.1:
+    resolution: {integrity: sha512-rXgU5noxaaMA5VJXgVPhXRzPiQ1WFmWwgo8dQFPg9j/yFM028scO0IAylFHVI8XMRevhozEt1usa6RQYQY26lg==}
+
   vitest-sonar-reporter@0.5.0:
     resolution: {integrity: sha512-6BQlx89502l/Z1NVWxN13ir0jCmC8e4/dit5YhoP6U+rX2Cs+CHt3vHnDDSrBwJTVc8QaAaC/hi9XnIH5I28AA==}
     engines: {node: ^12.20.0 || ^14.13.1 || >=16.0.0}
@@ -17851,6 +17857,11 @@ snapshots:
 
   vitest-environment-custom@file:test/core/vitest-environment-custom: {}
 
+  vitest-package-exports@0.1.1:
+    dependencies:
+      find-up-simple: 1.0.1
+      pathe: 2.0.3
+
   vitest-sonar-reporter@0.5.0(vitest@packages+vitest):
     dependencies:
       vitest: link:packages/vitest
diff --git a/test/browser/test/utils.test.ts b/test/browser/test/utils.test.ts
index f6de6683e..a6920f46f 100644
--- a/test/browser/test/utils.test.ts
+++ b/test/browser/test/utils.test.ts
@@ -2,7 +2,7 @@ import { commands } from '@vitest/browser/context'
 import { prettyDOM } from '@vitest/browser/utils'
 import { afterEach, expect, it, test } from 'vitest'
 
-import { inspect } from 'vitest/utils'
+import { inspect } from 'vitest/internal/browser'
 
 afterEach(() => {
   document.body.innerHTML = ''
diff --git a/test/core/package.json b/test/core/package.json
index df6939379..15e56cf4b 100644
--- a/test/core/package.json
+++ b/test/core/package.json
@@ -36,6 +36,7 @@
     "vite-node": "workspace:*",
     "vitest": "workspace:*",
     "vitest-environment-custom": "file:./vitest-environment-custom",
+    "vitest-package-exports": "^0.1.1",
     "vue": "catalog:",
     "zustand": "^4.5.6"
   }
diff --git a/test/core/test/exports.test.ts b/test/core/test/exports.test.ts
new file mode 100644
index 000000000..3db0c8c58
--- /dev/null
+++ b/test/core/test/exports.test.ts
@@ -0,0 +1,166 @@
+import { resolve } from 'node:path'
+import { expect, it } from 'vitest'
+import { getPackageExportsManifest } from 'vitest-package-exports'
+
+it('exports snapshot', async ({ skip, task }) => {
+  skip(task.file.pool !== 'threads', 'run only once inside threads')
+
+  const manifest = await getPackageExportsManifest({
+    importMode: 'package', // or 'dist' or 'package'
+    cwd: resolve(import.meta.dirname, '../../../packages/vitest'),
+  })
+
+  expect(manifest.exports)
+    .toMatchInlineSnapshot(`
+      {
+        ".": {
+          "afterAll": "function",
+          "afterEach": "function",
+          "assert": "function",
+          "assertType": "function",
+          "beforeAll": "function",
+          "beforeEach": "function",
+          "bench": "function",
+          "chai": "object",
+          "createExpect": "function",
+          "describe": "function",
+          "expect": "function",
+          "expectTypeOf": "function",
+          "inject": "function",
+          "it": "function",
+          "onTestFailed": "function",
+          "onTestFinished": "function",
+          "should": "function",
+          "suite": "function",
+          "test": "function",
+          "vi": "object",
+          "vitest": "object",
+        },
+        "./config": {
+          "configDefaults": "object",
+          "coverageConfigDefaults": "object",
+          "defaultBrowserPort": "number",
+          "defaultExclude": "object",
+          "defaultInclude": "object",
+          "defineConfig": "function",
+          "defineProject": "function",
+          "defineWorkspace": "function",
+          "extraInlineDeps": "object",
+          "mergeConfig": "function",
+        },
+        "./coverage": {
+          "BaseCoverageProvider": "function",
+        },
+        "./environments": {
+          "builtinEnvironments": "object",
+          "populateGlobal": "function",
+        },
+        "./execute": {
+          "VitestExecutor": "function",
+        },
+        "./internal/browser": {
+          "SpyModule": "object",
+          "TraceMap": "function",
+          "collectTests": "function",
+          "format": "function",
+          "getSafeTimers": "function",
+          "inspect": "function",
+          "loadDiffConfig": "function",
+          "loadSnapshotSerializers": "function",
+          "originalPositionFor": "function",
+          "processError": "function",
+          "setupCommonEnv": "function",
+          "startCoverageInsideWorker": "function",
+          "startTests": "function",
+          "stopCoverageInsideWorker": "function",
+          "stringify": "function",
+          "takeCoverageInsideWorker": "function",
+        },
+        "./mocker": {
+          "AutomockedModule": "function",
+          "AutospiedModule": "function",
+          "ManualMockedModule": "function",
+          "MockerRegistry": "function",
+          "RedirectedModule": "function",
+          "mockObject": "function",
+        },
+        "./node": {
+          "BaseSequencer": "function",
+          "GitNotFoundError": "function",
+          "TestFile": "function",
+          "TestsNotFoundError": "function",
+          "VitestPackageInstaller": "function",
+          "VitestPlugin": "function",
+          "createDebugger": "function",
+          "createMethodsRPC": "function",
+          "createServer": "function",
+          "createViteLogger": "function",
+          "createViteServer": "function",
+          "createVitest": "function",
+          "distDir": "string",
+          "esbuildVersion": "string",
+          "generateFileHash": "function",
+          "getFilePoolName": "function",
+          "isFileServingAllowed": "function",
+          "isValidApiRequest": "function",
+          "parseAst": "function",
+          "parseAstAsync": "function",
+          "parseCLI": "function",
+          "registerConsoleShortcuts": "function",
+          "resolveApiServerConfig": "function",
+          "resolveConfig": "function",
+          "resolveFsAllow": "function",
+          "rollupVersion": "string",
+          "rootDir": "string",
+          "startVitest": "function",
+          "version": "string",
+          "viteVersion": "string",
+        },
+        "./reporters": {
+          "BasicReporter": "function",
+          "BenchmarkReporter": "function",
+          "BenchmarkReportsMap": "object",
+          "DefaultReporter": "function",
+          "DotReporter": "function",
+          "GithubActionsReporter": "function",
+          "HangingProcessReporter": "function",
+          "JUnitReporter": "function",
+          "JsonReporter": "function",
+          "ReportersMap": "object",
+          "TapFlatReporter": "function",
+          "TapReporter": "function",
+          "VerboseBenchmarkReporter": "function",
+          "VerboseReporter": "function",
+        },
+        "./runners": {
+          "NodeBenchmarkRunner": "function",
+          "VitestTestRunner": "function",
+        },
+        "./snapshot": {
+          "VitestSnapshotEnvironment": "function",
+        },
+        "./suite": {
+          "createChainable": "function",
+          "createTaskCollector": "function",
+          "getBenchFn": "function",
+          "getBenchOptions": "function",
+          "getCurrentSuite": "function",
+          "getCurrentTest": "function",
+          "getFn": "function",
+          "getHooks": "function",
+          "setFn": "function",
+          "setHooks": "function",
+        },
+        "./workers": {
+          "collectVitestWorkerTests": "function",
+          "createForksRpcOptions": "function",
+          "createThreadsRpcOptions": "function",
+          "provideWorkerState": "function",
+          "runBaseTests": "function",
+          "runVitestWorker": "function",
+          "runVmTests": "function",
+          "unwrapSerializableConfig": "function",
+        },
+      }
+    `)
+})
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 7969262c3..a13f0f293 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -29,7 +29,7 @@
       "vitest/execute": ["./packages/vitest/src/public/execute.ts"],
       "vitest/config": ["./packages/vitest/src/public/config.ts"],
       "vitest/coverage": ["./packages/vitest/src/public/coverage.ts"],
-      "vitest/browser": ["./packages/vitest/src/public/browser.ts"],
+      "vitest/internal/browser": ["./packages/vitest/src/public/browser.ts"],
       "vitest/runners": ["./packages/vitest/src/public/runners.ts"],
       "vite-node": ["./packages/vite-node/src/index.ts"],
       "vite-node/client": ["./packages/vite-node/src/client.ts"],