记录一个vue项目报错UnhandledPromiseRejectionWarning: Unhandled promise rejection.

使用vue-cli创建vue项目，加入一些之前的代码，然后打包运行报错：

(node:4892) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing insi
de of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejectionid: 1)
(node:4892) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejectionsthat are not handled will terminate the Node.js process with a non-zero exit code.// 然后加卡在这里不动了
18% building modules 72/73 modules 1 active ...ce-demo\weixin-vioce-demo\src\App.vue

网上查阅了很多的资料，下面是我整理的解决方案：

在build文件夹下找到webpack.base.conf.js
然后修改加入const vueLoaderPlugin = require(‘vue-loader/lib/plugin’)

'use strict'
const path = require('path')
const utils = require('./utils')
const config = require('../config')
const vueLoaderConfig = require('./vue-loader.conf')
//加入的
const vueLoaderPlugin = require('vue-loader/lib/plugin')

在module.exports中引入 plugins:[new vueLoaderPlugin()]

 plugins:[new vueLoaderPlugin()]

下面是我的文件的完整代码

'use strict'
const path = require('path')
const utils = require('./utils')
const config = require('../config')
const vueLoaderConfig = require('./vue-loader.conf')
const vueLoaderPlugin = require('vue-loader/lib/plugin')function resolve (dir) {return path.join(__dirname, '..', dir)
}
module.exports = {context: path.resolve(__dirname, '../'),entry: {app: './src/main.js'},output: {path: config.build.assetsRoot,filename: '[name].js',publicPath: process.env.NODE_ENV === 'production'? config.build.assetsPublicPath: config.dev.assetsPublicPath},resolve: {extensions: ['.js', '.vue', '.json'],alias: {'vue$': 'vue/dist/vue.esm.js','@': resolve('src'),}},module: {rules: [{test: /\.vue$/,loader: 'vue-loader',options: vueLoaderConfig},{ test: /\.js$/,loader: 'babel-loader',include: [resolve('src'), resolve('test'), resolve('node_modules/webpack-dev-server/client')]},{test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,loader: 'url-loader',options: {limit: 10000,name: utils.assetsPath('img/[name].[hash:7].[ext]')}},{test: /\.(mp4|webm|ogg|mp3|wav|flac|aac)(\?.*)?$/,loader: 'url-loader',options: {limit: 10000,name: utils.assetsPath('media/[name].[hash:7].[ext]')}},{test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,loader: 'url-loader',options: {limit: 10000,name: utils.assetsPath('fonts/[name].[hash:7].[ext]')}},{test: /\.sass$/,loaders: ['style', 'css', 'sass']},{test:/\.style$/,use:['style-loader','css-loader']}]},node: {// prevent webpack from injecting useless setImmediate polyfill because Vue// source contains it (although only uses it if it's native).setImmediate: false,// prevent webpack from injecting mocks to Node native modules// that does not make sense for the clientdgram: 'empty',fs: 'empty',net: 'empty',tls: 'empty',child_process: 'empty'},plugins:[new vueLoaderPlugin()]
}

当以上解决之后再运行项目一般来说已经可以了，但是我这个项目还不行，继续其他错误

$ webpack-dev-server --inline --progress --config build/webpack.dev.conf.js
internal/modules/cjs/loader.js:638throw err;  ^
Error: Cannot find module 'vue-loader/lib/plugin'at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)at Function.Module._load (internal/modules/cjs/loader.js:562:25)at Module.require (internal/modules/cjs/loader.js:690:17) at require (internal/modules/cjs/helpers.js:25:18)at Object.<anonymous> (D:\HBuilderProjects\baidu-vioce-demo\weixin-vioce-demo\build\webpack.base.conf.js:6:25)at Module._compile (internal/modules/cjs/loader.js:776:30)at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)at Module.load (internal/modules/cjs/loader.js:653:32)at tryModuleLoad (internal/modules/cjs/loader.js:593:12)at Function.Module._load (internal/modules/cjs/loader.js:585:3)

这种错误其实网上有很多解决方法
主要的就是将对应的版本更新一下，就是对应的vue-loader这个插件的lib下面没有对应的plugin文件，具体做法：
升级了一下 “vue-loader”: “^15.7.0” 就好了

真棒！！

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记录一个vue项目报错UnhandledPromiseRejectionWarning: Unhandled promise rejection.

使用vue-cli创建vue项目，加入一些之前的代码，然后打包运行报错：

当以上解决之后再运行项目一般来说已经可以了，但是我这个项目还不行，继续其他错误

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