Function hasSetupBinding

packages/runtime-core/src/componentPublicInstance.ts:406–407

(state: Data, key: string)

  key === '_' || key === '$'

const hasSetupBinding = (state: Data, key: string) =>
  state !== EMPTY_OBJ && !state.__isScriptSetup && hasOwn(state, key)

export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
  get({ _: instance }: ComponentRenderContext, key: string) {