Node.js 在严格模式外尚不支持块作用域声明

我正在我的宅地流浪者箱上运行Laravel 5.4。我已经用

npm install

命令安装了所有的npm依赖项。这没有产生任何错误

在我的webpack.min.js文件中，我有：

const { mix } = require('laravel-mix');

/*
 |--------------------------------------------------------------------------
 | Mix Asset Management
 |--------------------------------------------------------------------------
 |
 | Mix provides a clean, fluent API for defining some Webpack build steps
 | for your Laravel application. By default, we are compiling the Sass
 | file for the application as well as bundling up all the JS files.
 |
 */

mix.js([
        'resources/assets/plugins/jquery-1.11.3.min.js',
        'resources/assets/plugins/bootstrap/js/bootstrap.min.js',
        'resources/assets/js/main.js'
    ], 'public/js'
);

mix.combine([
       'resources/assets/plugins/bootstrap/css/bootstrap.min.css',
       'resources/assets/plugins/font-awesome/css/font-awesome.css',
       'resources/assets/css/styles.css'
   ], 'public/css/all.css');

当我想运行

npm运行production

时，我得到以下错误：

> @ production /home/vagrant/projects/nielsvroman
> node node_modules/cross-env/bin/cross-env.js NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js

/home/vagrant/projects/nielsvroman/node_modules/laravel-mix/setup/webpack.config.js:120
        let extractPlugin = new plugins.ExtractTextPlugin(
        ^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:404:25)
    at Object.Module._extensions..js (module.js:432:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Module.require (module.js:366:17)
    at require (module.js:385:17)
    at requireConfig (/home/vagrant/projects/nielsvroman/node_modules/webpack/bin/convert-argv.js:96:18)
    at /home/vagrant/projects/nielsvroman/node_modules/webpack/bin/convert-argv.js:109:17
    at Array.forEach (native)

npm ERR! Linux 3.19.0-25-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "run" "production"
npm ERR! node v5.0.0
npm ERR! npm  v3.3.6
npm ERR! code ELIFECYCLE
npm ERR! @ production: `node node_modules/cross-env/bin/cross-env.js NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @ production script 'node node_modules/cross-env/bin/cross-env.js NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js'.
npm ERR! This is most likely a problem with the  package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node node_modules/cross-env/bin/cross-env.js NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js
npm ERR! You can get their info via:
npm ERR!     npm owner ls
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/vagrant/projects/nielsvroman/npm-debug.log

---

这可能有什么问题？

您的节点未更新

删除节点版本，然后安装最新版本

在项目根运行中：

npm rebuild

然后重试：

npm run production

---

注：如果你不想删除你的节点版本，请下载新版本并用它运行。

我在Ubuntu上遇到了旧版本的nodejs包引起的同样问题。我刚刚更新到7.5，它正在工作

curl-sLhttps://deb.nodesource.com/setup_7.x |sudo-E bash-
sudo apt get安装-y nodejs

升级节点包是这里的解决方案。添加可选步骤以升级节点包，因为无需自行下载、安装和管理节点版本。您可以使用名为

n

的模块升级Mac/Ubuntu中的节点包

sudo npm install -g n
sudo n stable

这将安装最新的稳定节点包。你可以跑

node --version

如果您仍然看到旧版本，则可能是安装了新软件包的目录问题。我必须创建一个符号链接才能让它工作-

sudo ln -s  /usr/local/n/versions/node/9.0.0/bin/node  /usr/local/bin/node

---

我在NodeJS中的一个测试脚本也遇到了同样的问题，我使用ECMAScript 5的严格模式解决了我的错误

"use strict";

在我的脚本顶部添加了一行，效果很好

Strict模式对普通JavaScript语义进行了一些更改：

通过将某些JavaScript静默错误更改为抛出错误来消除这些错误

修复了使JavaScript引擎难以执行优化的错误：有时可以使严格模式代码比非严格模式的相同代码运行得更快

"use strict";

禁止将来版本的ECMAScript中可能定义的某些语法

---

这是因为您的计算机上没有最新版本的NodeJS。 我在Ubuntu上，所以如果你在任何类型的Linux发行版上，试试这个

curl -sL https://deb.nodesource.com/setup_11.x | sudo -E bash -
sudo apt-get install -y nodejs

---

我也面临同样的问题，我已经尝试运行这些命令，现在它正在工作但在此之前，先卸载NodeJ

sudo apt-get update

apt-cache policy nodejs

sudo apt install nodejs

我希望你的问题会得到解决

$ npm run dev

> @ dev /var/www/laratest2
> npm run development


> @ development /var/www/laratest2
> cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js

/var/www/laratest2/node_modules/laravel-mix/setup/webpack.config.js:6
let mix = require('../src/index');
^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:374:25)
    at Object.Module._extensions..js (module.js:417:10)
    at Module.load (module.js:344:32)
    at Function.Module._load (module.js:301:12)
    at Module.require (module.js:354:17)
    at require (internal/module.js:12:17)
    at requireConfig (/var/www/laratest2/node_modules/webpack/bin/convert-argv.js:97:18)
    at /var/www/laratest2/node_modules/webpack/bin/convert-argv.js:104:17
    at Array.forEach (native)

npm ERR! Linux 4.15.0-45-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "run" "development"
npm ERR! node v4.2.6
npm ERR! npm  v3.5.2
npm ERR! code ELIFECYCLE
npm ERR! @ development: `cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the @ development script 'cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the  package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs 
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls 
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /var/www/laratest2/npm-debug.log

npm ERR! Linux 4.15.0-45-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "run" "dev"
npm ERR! node v4.2.6
npm ERR! npm  v3.5.2
npm ERR! code ELIFECYCLE
npm ERR! @ dev: `npm run development`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the @ dev script 'npm run development'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the  package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     npm run development
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs 
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls 
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /var/www/laratest2/npm-debug.log

当我运行

npm-run-dev

时，我得到了上面的错误，这是因为我有旧版本的nodejs

使用以下命令更新nodejs包

curl -sL https://deb.nodesource.com/setup_11.x | sudo -E bash -

sudo apt-get install -y nodejs

您可以使用以下方法检查版本：

node -v
npm -v

现在运行以下命令：

npm rebuild

然后试着运行

npm run dev

，这对我很有用

输出

 DONE  Compiled successfully in 9626ms                                                                                               3:14:07 PM

       Asset    Size  Chunks             Chunk Names
/css/app.css  226 kB       0  [emitted]  mix

---

nodejs 5不支持

let

外部严格模式。a） 更新nodejs或b）类型

“使用严格”在js文件的第一行，或者c）使用babel将文件传输到es5@baao，我增加了“严格使用”；到我的webpack.mix.js文件的顶部，但没有任何更改。我认为它需要在实际使用let的文件中。如果您无法更改该文件，您仍然有选项a和cAs（7月18日），不再支持nodejs 7-此链接应更新为：这是指向更新文档的链接。您可以从列表中选择首选版本。我也通过适当的升级解决了这个问题。这已经过时了，它指示人们安装节点7