vue3项目启动之后，会提示如下警告

You are running the esm-bundler build of vue-i18n. It is recommended to configure your bundler to explicitly replace feature flag globals with boolean literals to get proper tree-shaking in the final bundle.

解决方案

在vite.config.ts或者vite.config.js中添加一行

resolve: {
    // https://cn.vitejs.dev/config/#resolve-alias
    alias: {
      "vue-i18n": "vue-i18n/dist/vue-i18n.cjs.js",
    },
  },