Browser compatibility: not working on IE11 after 'yarn build'

[wwwtony5488]

Version

3.9.2

Environment info

  Binaries:
    Node: 10.15.1 - /usr/local/bin/node
    Yarn: 1.13.0 - /usr/local/bin/yarn
    npm: 6.10.1 - /usr/local/bin/npm
  npmPackages:
    @vue/babel-helper-vue-jsx-merge-props:  1.0.0 
    @vue/babel-plugin-transform-vue-jsx:  1.0.0 
    @vue/babel-preset-app:  3.11.0 
    @vue/babel-preset-jsx:  1.1.0 
    @vue/babel-sugar-functional-vue:  1.0.0 
    @vue/babel-sugar-inject-h:  1.0.0 
    @vue/babel-sugar-v-model:  1.0.0 
    @vue/babel-sugar-v-on:  1.1.0 
    @vue/cli-overlay:  3.9.0 
    @vue/cli-plugin-babel: ^3.11.0 => 3.11.0 
    @vue/cli-plugin-e2e-nightwatch: ^3.9.0 => 3.9.2 
    @vue/cli-plugin-typescript: ^3.9.0 => 3.9.0 
    @vue/cli-plugin-unit-jest: ^3.9.0 => 3.9.0 
    @vue/cli-service: ^3.9.0 => 3.9.3 
    @vue/cli-shared-utils:  3.9.0 (3.11.0)
    @vue/component-compiler-utils:  2.6.0 (3.0.0)
    @vue/preload-webpack-plugin:  1.1.0 
    @vue/test-utils: 1.0.0-beta.29 => 1.0.0-beta.29 
    @vue/web-component-wrapper:  1.2.0 
    babel-helper-vue-jsx-merge-props:  2.0.3 
    jest-serializer-vue:  2.0.2 
    typescript: ^3.4.3 => 3.5.3 
    vue: ^2.6.10 => 2.6.10 
    vue-class-component: ^7.0.2 => 7.1.0 
    vue-cli-plugin-element: ^1.0.1 => 1.0.1 
    vue-echarts: ^4.0.3 => 4.0.3 
    vue-hot-reload-api:  2.3.3 
    vue-jest:  3.0.4 
    vue-loader:  15.7.1 
    vue-property-decorator: ^8.1.0 => 8.2.1 
    vue-router: ^3.0.3 => 3.0.7 
    vue-style-loader:  4.1.2 
    vue-template-compiler: ^2.6.10 => 2.6.10 
    vue-template-es2015-compiler:  1.9.1 
    vuex: ^3.0.1 => 3.1.1 
    vuex-persistedstate: ^2.5.4 => 2.5.4 
  npmGlobalPackages:
    @vue/cli: Not Found

Steps to reproduce

1. babel.config.js

module.exports = {
  presets: [
    ['@vue/app', {
      useBuiltIns: 'entry',
    }]
  ]
}

2. main.ts

import '@babel/polyfill'; <br>
import Vue from 'vue';

3. package.json
   "build": "vue-cli-service build"

4. .browserslistrc

`> 2%` <br>
ie 11

$ yarn build

$ npx browserslist
shows 'ie 11' indeed, but codes in /dist/js/*.js still exist some parts such as 'p(e, t={})' and 'Promise'

What is expected?

To figure out is that something I missed,
cause I followed the documentation

What is actually happening?

got error message " Expected ')' " on IE 11

[LinusBorg]

Please read the README of vue-echarts.

It's the reason for your errors

[wwwtony5488]

thanks, I finally resolved.