diff --git a/packages/reactivity/__tests__/baseWatch.spec.ts b/packages/reactivity/__tests__/baseWatch.spec.ts
index 329ebaacbf2..02d9e64e0fa 100644
--- a/packages/reactivity/__tests__/baseWatch.spec.ts
+++ b/packages/reactivity/__tests__/baseWatch.spec.ts
@@ -6,7 +6,7 @@ import {
   baseWatch,
   onEffectCleanup,
   ref,
-} from '../src/index'
+} from '../src'
 
 const queue: SchedulerJob[] = []
 
@@ -15,7 +15,7 @@ let isFlushPending = false
 const resolvedPromise = /*#__PURE__*/ Promise.resolve() as Promise<any>
 const nextTick = (fn?: () => any) =>
   fn ? resolvedPromise.then(fn) : resolvedPromise
-const scheduler: Scheduler = ({ job }) => {
+const scheduler: Scheduler = job => {
   queue.push(job)
   flushJobs()
 }
diff --git a/packages/reactivity/src/baseWatch.ts b/packages/reactivity/src/baseWatch.ts
index 8afd7424739..a97f43366b9 100644
--- a/packages/reactivity/src/baseWatch.ts
+++ b/packages/reactivity/src/baseWatch.ts
@@ -24,12 +24,13 @@ import { isReactive, isShallow } from './reactive'
 import { type Ref, isRef } from './ref'
 import { getCurrentScope } from './effectScope'
 
-// contexts where user provided function may be executed, in addition to
-// lifecycle hooks.
+// These errors were transferred from `packages/runtime-core/src/errorHandling.ts`
+// along with baseWatch to maintain code compatibility. Hence,
+// it is essential to keep these values unchanged.
 export enum BaseWatchErrorCodes {
-  WATCH_GETTER = 'BaseWatchErrorCodes_WATCH_GETTER',
-  WATCH_CALLBACK = 'BaseWatchErrorCodes_WATCH_CALLBACK',
-  WATCH_CLEANUP = 'BaseWatchErrorCodes_WATCH_CLEANUP',
+  WATCH_GETTER = 2,
+  WATCH_CALLBACK,
+  WATCH_CLEANUP,
 }
 
 // TODO move to a scheduler package
@@ -57,15 +58,12 @@ export interface SchedulerJob extends Function {
 }
 
 type WatchEffect = (onCleanup: OnCleanup) => void
-
 type WatchSource<T = any> = Ref<T> | ComputedRef<T> | (() => T)
-
 type WatchCallback<V = any, OV = any> = (
   value: V,
   oldValue: OV,
   onCleanup: OnCleanup,
 ) => any
-
 type OnCleanup = (cleanupFn: () => void) => void
 
 export interface BaseWatchOptions<Immediate = boolean> extends DebuggerOptions {
@@ -80,22 +78,19 @@ export interface BaseWatchOptions<Immediate = boolean> extends DebuggerOptions {
 // initial value for watchers to trigger on undefined initial values
 const INITIAL_WATCHER_VALUE = {}
 
-export type Scheduler = (context: {
-  effect: ReactiveEffect
-  job: SchedulerJob
-  isInit: boolean
-}) => void
-
-const DEFAULT_SCHEDULER: Scheduler = ({ job }) => job()
-
+export type Scheduler = (
+  job: SchedulerJob,
+  effect: ReactiveEffect,
+  isInit: boolean,
+) => void
 export type HandleError = (err: unknown, type: BaseWatchErrorCodes) => void
+export type HandleWarn = (msg: string, ...args: any[]) => void
 
+const DEFAULT_SCHEDULER: Scheduler = job => job()
 const DEFAULT_HANDLE_ERROR: HandleError = (err: unknown) => {
   throw err
 }
 
-export type HandleWarn = (msg: string, ...args: any[]) => void
-
 const cleanupMap: WeakMap<ReactiveEffect, (() => void)[]> = new WeakMap()
 let activeEffect: ReactiveEffect | undefined = undefined
 
@@ -306,12 +301,7 @@ export function baseWatch(
   // it is allowed to self-trigger (#1727)
   job.allowRecurse = !!cb
 
-  let effectScheduler: EffectScheduler = () =>
-    scheduler({
-      effect,
-      job,
-      isInit: false,
-    })
+  let effectScheduler: EffectScheduler = () => scheduler(job, effect, false)
 
   effect = new ReactiveEffect(getter, NOOP, effectScheduler)
 
@@ -342,11 +332,7 @@ export function baseWatch(
       oldValue = effect.run()
     }
   } else {
-    scheduler({
-      effect,
-      job,
-      isInit: true,
-    })
+    scheduler(job, effect, true)
   }
 
   return effect
diff --git a/packages/reactivity/src/index.ts b/packages/reactivity/src/index.ts
index 6e2e51875dd..a8db2454a80 100644
--- a/packages/reactivity/src/index.ts
+++ b/packages/reactivity/src/index.ts
@@ -72,8 +72,8 @@ export { TrackOpTypes, TriggerOpTypes, ReactiveFlags } from './constants'
 export {
   baseWatch,
   onEffectCleanup,
-  BaseWatchErrorCodes,
   traverse,
+  BaseWatchErrorCodes,
   type BaseWatchOptions,
   type Scheduler,
 } from './baseWatch'
diff --git a/packages/runtime-core/src/apiWatch.ts b/packages/runtime-core/src/apiWatch.ts
index 0371dc57cac..b6c0d5f838d 100644
--- a/packages/runtime-core/src/apiWatch.ts
+++ b/packages/runtime-core/src/apiWatch.ts
@@ -8,9 +8,9 @@ import {
   getCurrentScope,
 } from '@vue/reactivity'
 import {
-  type SchedulerJob,
-  usePreScheduler,
-  useSyncScheduler,
+  type SchedulerFactory,
+  createPreScheduler,
+  createSyncScheduler,
 } from './scheduler'
 import {
   EMPTY_OBJ,
@@ -28,7 +28,7 @@ import {
   unsetCurrentInstance,
 } from './component'
 import { handleError as handleErrorWithInstance } from './errorHandling'
-import { usePostRenderScheduler } from './renderer'
+import { createPostRenderScheduler } from './renderer'
 import { warn } from './warning'
 import type { ObjectWatchOptionItem } from './componentOptions'
 import { useSSRContext } from './helpers/useSsrContext'
@@ -156,17 +156,15 @@ export function watch<T = any, Immediate extends Readonly<boolean> = false>(
   return doWatch(source as any, cb, options)
 }
 
-function getSchedulerByFlushMode(
-  flush: WatchOptionsBase['flush'],
-): SchedulerJob {
+function getScheduler(flush: WatchOptionsBase['flush']): SchedulerFactory {
   if (flush === 'post') {
-    return usePostRenderScheduler
+    return createPostRenderScheduler
   }
   if (flush === 'sync') {
-    return useSyncScheduler
+    return createSyncScheduler
   }
   // default: 'pre'
-  return usePreScheduler
+  return createPreScheduler
 }
 
 function doWatch(
@@ -224,12 +222,9 @@ function doWatch(
   }
 
   const instance = currentInstance
-
   extendOptions.onError = (err: unknown, type: BaseWatchErrorCodes) =>
     handleErrorWithInstance(err, instance, type)
-
-  const scheduler = getSchedulerByFlushMode(flush)({ instance })
-  extendOptions.scheduler = scheduler
+  extendOptions.scheduler = getScheduler(flush)(instance)
 
   let effect = baseWatch(source, cb, extend({}, options, extendOptions))
 
diff --git a/packages/runtime-core/src/componentOptions.ts b/packages/runtime-core/src/componentOptions.ts
index ef1f14063ed..046520d9ed9 100644
--- a/packages/runtime-core/src/componentOptions.ts
+++ b/packages/runtime-core/src/componentOptions.ts
@@ -942,7 +942,7 @@ export function createWatcher(
     ? createPathGetter(publicThis, key)
     : () => (publicThis as any)[key]
 
-  const options: WatchOptions<false> = {}
+  const options: WatchOptions = {}
   if (__COMPAT__) {
     const instance =
       getCurrentScope() === currentInstance?.scope ? currentInstance : null
diff --git a/packages/runtime-core/src/errorHandling.ts b/packages/runtime-core/src/errorHandling.ts
index 82de575c1e0..8686aee3880 100644
--- a/packages/runtime-core/src/errorHandling.ts
+++ b/packages/runtime-core/src/errorHandling.ts
@@ -10,7 +10,13 @@ import { BaseWatchErrorCodes } from '@vue/reactivity'
 export enum ErrorCodes {
   SETUP_FUNCTION,
   RENDER_FUNCTION,
-  NATIVE_EVENT_HANDLER,
+  // The error codes for the watch have been transferred to the reactivity
+  // package along with baseWatch to maintain code compatibility. Hence,
+  // it is essential to keep these values unchanged.
+  // WATCH_GETTER,
+  // WATCH_CALLBACK,
+  // WATCH_CLEANUP,
+  NATIVE_EVENT_HANDLER = 5,
   COMPONENT_EVENT_HANDLER,
   VNODE_HOOK,
   DIRECTIVE_HOOK,
diff --git a/packages/runtime-core/src/renderer.ts b/packages/runtime-core/src/renderer.ts
index 88c8f370e84..4f5e8a99dae 100644
--- a/packages/runtime-core/src/renderer.ts
+++ b/packages/runtime-core/src/renderer.ts
@@ -38,7 +38,7 @@ import {
   isReservedProp,
 } from '@vue/shared'
 import {
-  type Scheduler,
+  type SchedulerFactory,
   type SchedulerJob,
   flushPostFlushCbs,
   flushPreFlushCbs,
@@ -282,9 +282,8 @@ export const queuePostRenderEffect = __FEATURE_SUSPENSE__
     : queueEffectWithSuspense
   : queuePostFlushCb
 
-export const usePostRenderScheduler: Scheduler =
-  ({ instance }) =>
-  ({ isInit, effect, job }) => {
+export const createPostRenderScheduler: SchedulerFactory =
+  instance => (job, effect, isInit) => {
     if (isInit) {
       queuePostRenderEffect(
         effect.run.bind(effect),
diff --git a/packages/runtime-core/src/scheduler.ts b/packages/runtime-core/src/scheduler.ts
index 5b15a8ae6a3..2ab47e51dc1 100644
--- a/packages/runtime-core/src/scheduler.ts
+++ b/packages/runtime-core/src/scheduler.ts
@@ -1,7 +1,7 @@
 import { ErrorCodes, callWithErrorHandling, handleError } from './errorHandling'
 import { type Awaited, NOOP, isArray } from '@vue/shared'
 import { type ComponentInternalInstance, getComponentName } from './component'
-import type { ReactiveEffect } from '@vue/reactivity'
+import type { Scheduler } from '@vue/reactivity'
 
 export interface SchedulerJob extends Function {
   id?: number
@@ -289,17 +289,12 @@ function checkRecursiveUpdates(seen: CountMap, fn: SchedulerJob) {
   }
 }
 
-export type Scheduler = (options: {
-  instance: ComponentInternalInstance | null
-}) => (context: {
-  effect: ReactiveEffect
-  job: SchedulerJob
-  isInit: boolean
-}) => void
-
-export const useSyncScheduler: Scheduler =
-  ({ instance }) =>
-  ({ isInit, effect, job }) => {
+export type SchedulerFactory = (
+  instance: ComponentInternalInstance | null,
+) => Scheduler
+
+export const createSyncScheduler: SchedulerFactory =
+  instance => (job, effect, isInit) => {
     if (isInit) {
       effect.run()
     } else {
@@ -307,9 +302,8 @@ export const useSyncScheduler: Scheduler =
     }
   }
 
-export const usePreScheduler: Scheduler =
-  ({ instance }) =>
-  ({ isInit, effect, job }) => {
+export const createPreScheduler: SchedulerFactory =
+  instance => (job, effect, isInit) => {
     if (isInit) {
       effect.run()
     } else {