diff --git a/packages/runtime-core/src/apiAsyncComponent.ts b/packages/runtime-core/src/apiAsyncComponent.ts
index 7f65f3b47b2..a90eea02053 100644
--- a/packages/runtime-core/src/apiAsyncComponent.ts
+++ b/packages/runtime-core/src/apiAsyncComponent.ts
@@ -1,21 +1,17 @@
 import {
-  PublicAPIComponent,
   Component,
   currentInstance,
   ComponentInternalInstance,
   isInSSRComponentSetup
 } from './component'
 import { isFunction, isObject } from '@vue/shared'
-import { ComponentPublicInstance } from './componentProxy'
 import { createVNode } from './vnode'
 import { defineComponent } from './apiDefineComponent'
 import { warn } from './warning'
 import { ref } from '@vue/reactivity'
 import { handleError, ErrorCodes } from './errorHandling'
 
-export type AsyncComponentResolveResult<T = PublicAPIComponent> =
-  | T
-  | { default: T } // es modules
+export type AsyncComponentResolveResult<T = Component> = T | { default: T } // es modules
 
 export type AsyncComponentLoader<T = any> = () => Promise<
   AsyncComponentResolveResult<T>
@@ -23,8 +19,8 @@ export type AsyncComponentLoader<T = any> = () => Promise<
 
 export interface AsyncComponentOptions<T = any> {
   loader: AsyncComponentLoader<T>
-  loadingComponent?: PublicAPIComponent
-  errorComponent?: PublicAPIComponent
+  loadingComponent?: Component
+  errorComponent?: Component
   delay?: number
   timeout?: number
   suspensible?: boolean
@@ -36,9 +32,9 @@ export interface AsyncComponentOptions<T = any> {
   ) => any
 }
 
-export function defineAsyncComponent<
-  T extends PublicAPIComponent = { new (): ComponentPublicInstance }
->(source: AsyncComponentLoader<T> | AsyncComponentOptions<T>): T {
+export function defineAsyncComponent<T extends Component>(
+  source: AsyncComponentLoader<T> | AsyncComponentOptions<T>
+): T {
   if (isFunction(source)) {
     source = { loader: source }
   }
diff --git a/packages/runtime-core/src/apiCreateApp.ts b/packages/runtime-core/src/apiCreateApp.ts
index c1e0538cb6d..b581bf0583d 100644
--- a/packages/runtime-core/src/apiCreateApp.ts
+++ b/packages/runtime-core/src/apiCreateApp.ts
@@ -1,9 +1,4 @@
-import {
-  Component,
-  Data,
-  validateComponentName,
-  PublicAPIComponent
-} from './component'
+import { Component, Data, validateComponentName } from './component'
 import { ComponentOptions } from './componentOptions'
 import { ComponentPublicInstance } from './componentProxy'
 import { Directive, validateDirectiveName } from './directives'
@@ -18,8 +13,8 @@ export interface App<HostElement = any> {
   config: AppConfig
   use(plugin: Plugin, ...options: any[]): this
   mixin(mixin: ComponentOptions): this
-  component(name: string): PublicAPIComponent | undefined
-  component(name: string, component: PublicAPIComponent): this
+  component(name: string): Component | undefined
+  component(name: string, component: Component): this
   directive(name: string): Directive | undefined
   directive(name: string, directive: Directive): this
   mount(
@@ -67,7 +62,7 @@ export interface AppConfig {
 export interface AppContext {
   config: AppConfig
   mixins: ComponentOptions[]
-  components: Record<string, PublicAPIComponent>
+  components: Record<string, Component>
   directives: Record<string, Directive>
   provides: Record<string | symbol, any>
   reload?: () => void // HMR only
@@ -101,7 +96,7 @@ export function createAppContext(): AppContext {
 }
 
 export type CreateAppFunction<HostElement> = (
-  rootComponent: PublicAPIComponent,
+  rootComponent: Component,
   rootProps?: Data | null
 ) => App<HostElement>
 
@@ -172,7 +167,7 @@ export function createAppAPI<HostElement>(
         return app
       },
 
-      component(name: string, component?: PublicAPIComponent): any {
+      component(name: string, component?: Component): any {
         if (__DEV__) {
           validateComponentName(name, context.config)
         }
diff --git a/packages/runtime-core/src/apiDefineComponent.ts b/packages/runtime-core/src/apiDefineComponent.ts
index c235e30c388..7ff6d0fae86 100644
--- a/packages/runtime-core/src/apiDefineComponent.ts
+++ b/packages/runtime-core/src/apiDefineComponent.ts
@@ -59,6 +59,9 @@ export function defineComponent<
     E,
     VNodeProps & Props
   >
+  // make the type compatible with `Component`.
+  // this can be just `typeof options` but it's not supported by API extractor
+  // yet
 } & ComponentOptionsWithoutProps<Props, RawBindings, D, C, M, E, EE>
 
 // overload 3: object format with array props declaration
diff --git a/packages/runtime-core/src/component.ts b/packages/runtime-core/src/component.ts
index a2387a648a1..8a85392ed3c 100644
--- a/packages/runtime-core/src/component.ts
+++ b/packages/runtime-core/src/component.ts
@@ -73,12 +73,6 @@ export interface ClassComponent {
 
 export type Component = ComponentOptions | FunctionalComponent<any>
 
-// A type used in public APIs where a component type is expected.
-// The constructor type is an artificial type returned by defineComponent().
-export type PublicAPIComponent =
-  | Component
-  | { new (...args: any[]): ComponentPublicInstance<any, any, any, any, any> }
-
 export { ComponentOptions }
 
 type LifecycleHook = Function[] | null
diff --git a/packages/runtime-core/src/componentOptions.ts b/packages/runtime-core/src/componentOptions.ts
index 78ef9c3d735..68bf8711ee2 100644
--- a/packages/runtime-core/src/componentOptions.ts
+++ b/packages/runtime-core/src/componentOptions.ts
@@ -4,7 +4,6 @@ import {
   SetupContext,
   RenderFunction,
   SFCInternalOptions,
-  PublicAPIComponent,
   Component
 } from './component'
 import {
@@ -102,7 +101,7 @@ export interface ComponentOptionsBase<
     push: (item: any) => void,
     parentInstance: ComponentInternalInstance
   ) => void
-  components?: Record<string, PublicAPIComponent>
+  components?: Record<string, Component>
   directives?: Record<string, Directive>
   inheritAttrs?: boolean
   emits?: E | EE[]