fix(compat): maintain compatConfig option in legacy functional comp (#4974)

packages/runtime-core/src/compat/componentFunctional.ts

@@ -55,6 +55,7 @@ export function convertLegacyFunctionalComponent(comp: ComponentOptions) {
   }
   Func.props = comp.props
   Func.displayName = comp.name
+  Func.compatConfig = comp.compatConfig
   // v2 functional components do not inherit attrs
   Func.inheritAttrs = false
 

packages/runtime-core/src/component.ts

@@ -60,7 +60,11 @@ import { markAttrsAccessed } from './componentRenderUtils'
 import { currentRenderingInstance } from './componentRenderContext'
 import { startMeasure, endMeasure } from './profiling'
 import { convertLegacyRenderFn } from './compat/renderFn'
-import { globalCompatConfig, validateCompatConfig } from './compat/compatConfig'
+import {
+  CompatConfig,
+  globalCompatConfig,
+  validateCompatConfig
+} from './compat/compatConfig'
 import { SchedulerJob } from './scheduler'
 
 export type Data = Record<string, unknown>
@@ -111,6 +115,7 @@ export interface FunctionalComponent<P = {}, E extends EmitsOptions = {}>
   emits?: E | (keyof E)[]
   inheritAttrs?: boolean
   displayName?: string
+  compatConfig?: CompatConfig
 }
 
 export interface ClassComponent {