@vue/test-utils/dist/utils/vueCompatSupport.d.ts

import type { ComponentOptions } from 'vue';
export declare function isLegacyExtendedComponent(component: unknown): component is {
    (): Function;
    super: Function;
    options: ComponentOptions;
};
export declare function unwrapLegacyVueExtendComponent<T>(selector: T): T | ComponentOptions;
export declare function isLegacyFunctionalComponent(component: unknown): boolean;