Vue.js 网页包'；s输出未定义，但输入文件内容有效

尝试从webpack导入

dist/index.js

捆绑包时，我的导入失败，但是将

dist/index.js

的内容替换为

src/index.js

会导致它工作console.log变得相同。有什么想法吗

导入包的项目：

Example.vue

webpack.config.js

package.json

<template>
...
</template>

<script>
import { TestComponent } from 'form-builder'
console.log(TestComponent) // undefined
...
</script>

import TestComponent from '../src/TestComponent.vue'

export {
    TestComponent
}

console.log(TestComponent) // {name: "TestComponent", props: Array(1), components: {…}, staticRenderFns: Array(1), render: ƒ, …}

const path = require('path');
const VueLoaderPlugin = require('vue-loader/lib/plugin')

module.exports = {
  mode: 'development',
  entry: './src/index.js',
  output: {
    path: path.resolve('dist'),
    filename: 'index.js'
  },
  module: {
    rules: [
      {
        test: /\.vue$/,
        loader: 'vue-loader'
      },
      {
        test: /\.js$/,
        loader: 'babel-loader'
      }
    ]
  },
  plugins: [
    new VueLoaderPlugin()
  ]
}

{
  "name": "form-builder",
  "version": "1.0.0",
  "description": "",
  "private": true,
  "main": "dist/index.js",
  "scripts": {
    "build": "webpack --mode development"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.11.6",
    "babel-core": "^6.26.3",
    "babel-loader": "^8.1.0",
    "babel-preset-env": "^1.7.0",
    "babel-preset-stage-2": "^6.24.1",
    "vue-loader": "^15.9.3",
    "webpack": "^4.44.2",
    "webpack-cli": "^3.3.12"
  },
  "dependencies": {
    "jquery": "^3.5.1",
    "vue": "^2.6.12",
    "vue-template-compiler": "^2.6.12",
    "webpack-merge": "^5.1.4"
  }
}