vue init webpack vue-flag-list
cd vue-flag-list
cnpm install 
npm run dev

<template>
 <div id="flag">
 ...
 </div>
</template>

<script>
 export default {
  name: 'vue-flag-list',
  ...
 }
</script>

<style scoped>
 ...
</style>

import flagComponent from './Vue-Flag-List.vue'

const VueFlagList = {
 install: function (Vue) {
 if (typeof window !== 'undefined' && window.Vue) {
  Vue = window.Vue
 }
 Vue.component('VueFlagList', flagComponent)
 }
}

export default VueFlagList

{
 "name": "vue-flag-list",
 "version": "1.0.0",
 "description": "A vue plugin for entering and selecting area code",
 "author": "guimin",
 // 因为组件包是公用的，所以private为false
 "private": false,
 // 配置main结点，如果不配置，我们在其他项目中就不用import XX from '包名'来引用了，只能以包名作为起点来指定相对的路径
 "main": "dist/vue-flag-list.min.js", 
 "scripts": {
 "dev": "node build/dev-server.js",
 "start": "node build/dev-server.js",
 "build": "node build/build.js"
 },
 // 指定代码所在的仓库地址
 "repository": {
 "type": "git",
 "url": "git+https://github.com/linmoer/vue-flag-list.git"
 },
 // 指定打包之后，包中存在的文件夹
 "files": [
 "dist",
 "src"
 ],
 // 指定关键字
 "keywords": [
 "vue",
 "flag",
 "code",
 "flag code"
 ],
 "license": "MIT", //开源协议
 // 项目官网的url
 "homepage": "https://github.com/linmoer/vue-flag-list#readme",
 "dependencies": {
 "vue": "^2.3.3"
 },
 "devDependencies": {
 ...
 },
 "engines": {...},
 "browserslist": [...]
}

 output: {
 path: path.resolve(__dirname, '../dist'),
 publicPath: '',
 filename: 'vue-flag-list.min.js',
 library: 'VueFlagList',
 libraryTarget: 'umd',
 umdNamedDefine: true
 },

externals: {
 vue: {
  root: 'Vue',
  commonjs: 'vue',
  commonjs2: 'vue',
  amd: 'vue'
 }
 },

new ExtractTextPlugin({
  filename: utils.assetsPath('css/[name].[contenthash].css')
 }),

new ExtractTextPlugin({
  filename: 'vue-flag-list.min.css'
 }),

entry: {
 app: './src/index.js'
 },

- vue-flag-list
 + build
 + dist
 - src
 + img
 index.js
 Vue-Flag-List.vue
 ...

npm build
npm pack

cnpm install 路径/vue-flag-list-1.0.0.tgz

import VueFlagList from 'vue-flag-list'
import 'vue-flag-list/dist/vue-flag-list.min.css'

Vue.use(VueFlagList)

<flagCode height="30" width="120" @getCode="getCode"></flagCode>

methos: {
 getCode(code) {
  console.log(code)
 }
}

npm login

# lin@lin-Pro in ~/www/vue-flag-list on git:master $ npm publish
# lin@lin-Pro in ~/www/vue-flag-list on git:master $ + vue-flag-list@1.0.0