<template>
  <div>
    {{ $env }}<br />
    {{ $filters.format("的飞机") }}
  </div>
</template>

<script setup lang="ts">
import { getCurrentInstance } from "vue";
const app = getCurrentInstance();
console.log(app?.proxy?.$filters.format("dffdfd"));
</script>

<style></style>

main.ts:

import { createApp } from "vue";
import "./style.css";
import "animate.css";
import App from "./App.vue";
import ElementPlus, { Filter } from "element-plus";
import  mitt  from  'mitt'
import "element-plus/dist/index.css";
import cart from "./components/cart.vue";
import tree from "./components/tree.vue";
import * as ElementPlusIconsVue from "@element-plus/icons-vue";
const app = createApp(App);
for (const [key, component] of Object.entries(ElementPlusIconsVue)) {
  app.component(key, component);
}
 const  Mit = mitt();
app.use(ElementPlus);
declare module 'vue' {
  export interface ComponentCustomProperties{
    $Bus: typeof Mit,
    $filters:Filter
  }
}
type Filter = {
   format<T>(str:T):string
 }
app.config.globalProperties.$Bus = Mit;
app.config.globalProperties.$env = "dev";
app.config.globalProperties.$filters = {
  format<T>(str: T) {
    return  `小满-${str}`
  }
};
app.component("cart", cart);
app.component("tree", tree);
app.mount("#app");

效果图：