create-cocos-plugin/templates/vue-element-plus/src/panels/provide-inject.ts

## Scaffolding Your First COCOS-plugin Project

import type { InjectionKey } from 'vue';

import type { MessageOptions, MessageHandler } from 'element-plus';

export const keyAppRoot = Symbol() as InjectionKey<HTMLElement>;

export const keyMessage = Symbol() as InjectionKey<(options?: MessageOptions) => MessageHandler>;