Unexpected Token Import Babel


SyntaxError: Unexpected token u in JSON at position 0 when not using JSON. Questions: This question already has an answer here: Node error: SyntaxError: Unexpected token import 2 answers Answers: While import is indeed part of ES6, it is unfortunately not yet supported in NodeJS, and has only very recently landed support in browsers. Reactjs: Unexpected token. Unexpected token import with gulp I have started to play with the release version of Aurelia. google-docs-mustaches????Interpolate Google Docs files using mustaches and formatters. This usually means that you are trying to import a file which Jest '@babel/preset-env',. brendonco opened this issue Mar 24, Unexpected token import at ScriptTransformer. json file :(, any help would be greatly appreciated, thank you :3. We require use Babel. Hi Everyone! Currently I'm trying to integrate the testing framework for ReactJS which is called as Jest. babel-node js. Tags : typescript vue. 一个ReactJS的项目,之前正常运行的。 后来去重新npm install后再去npm run build结果出错:. The files that you import/require from your quokka file will be compiled using. js doesn't have 41 lines and doesn't contain import statements and anyway they should have been taken care of. js Test suite failed to run Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. 在路上'SyntaxError: Unexpected token import' 最新消息:20190717 VPS服务器:Vultr新加坡,WordPress主题:大前端D8,统一介绍入口:关于. Working with Webpack and @babel/preset-env Currently, @babel/preset-env is unaware that using import() with Webpack relies on Promise internally. In addition, make sure that babylon (babel dependency) is at least 6. This is antithetical to what is happening with the babel-import-plugin output, which is just injecting require statements into files and not keeping track of any association with components. js issue tracker has an open issue for this - but until V8 and Node add support for this feature, you will need to use a transpiler (most popular one being babel) to be able to use imports. js still got same error, unexpected token import? How could I get rid of it?. I built my OWA from OpenMRS OWA generator. The static import statement is used to import bindings which are exported by another module. test_entry. Previously, it was the entire compiler and all the transforms plus a bunch of CLI tools, but this lead to unnecessarily large downloads and was a bit confusing. Babel 6 CLI: Unexpected token export? Ask Question "unexpected token import" in Nodejs5 and babel? 79. babel-node js. UNEXPECTED TOKEN 'import' What's Going on? What exactly a module is is not exactly known. I have been searching about this issue for quite sometime and couldn't find any solution. Uncaught SyntaxError: Unexpected token import при запуске приложения npm install babel-loader babel-core babel-preset-es2015 webpack --save-dev. $ npm install --global babel-cli # or $ npm install --save-dev babel-core. js require the application and kick it off -- just don't use ES6 or anything in it. Using ES6 and ES7 in the Browser, with Babel 6 and Webpack posted in ES6 , Javascript , Meta , React on November 10, 2015 by James K Nelson This guide is part of The Complete Guide to ES6 with Babel 6 series. Unexpected token import running node server. However modules are not currently supported so you'll need to use `require()` still. Babel unexpected token import when running mocha tests. No more Unexpected token import, wrong line breakpoint, unreadable transpiled. I am getting Uncaught SyntaxError: Unexpected token import Does it make any difference that I am in an umbrella project?. js, I set the "transorm" option with babe. Seem's like you've not installed the babel-preset-es2015, since the import feature is not implemented in the default babel-preset (it's not a confirmed standard yet) Install / add this package and try again :). All it needed was to add a package. % npm install --save-dev babel babel-core babel-loader こういうの出る % webpack ERROR in. json file contains a top-level field "type" with a value of "commonjs". So we do not want node on the server to process those files at all. To change that, one approach is: 1) extract webpack configuration with npm run eject (don't know if there is another way to override settings in react-create-app). js still got same error, unexpected token import? How could I get rid of it?. I will use this one. friends! I have trouble with webpack build. And by default, when using exports with babel a non-enumerable __esModule property is exported. And that's all, from now on, instead of running node server. node --experimental-modules my-app. UNEXPECTED TOKEN 'import' What's Going on? What exactly a module is is not exactly known. Jest encountered an unexpected token. This usually means that you are trying to import a file which Jest '@babel/preset-env',. babelrc file, but it do the same thing. The solutions offered in other related questions, such as including the proper presets (es2015) in. Currently I'm just using npm scripts (babel src -d dist --watch) to get the desired behavior, but it'd be nice if it were baked into File Watchers. babel-node js. Assignees No one assigned 4 participants jfernandogt commented May 16, 2016. All it needed was to add a package. Allow parsing of import() babel-plugin-syntax-dynamic-import. % npm install --save-dev babel babel-core babel-loader こういうの出る % webpack ERROR in. It seems that Jest is missing the babel configuration in my package. import co from 'co'; ^^^^^ SyntaxError: Unexpected token import Then i tried to use babel. SyntaxError: Unexpected token import 语法错误:此处不应该出现 import. Installing babel-plugin-dynamic-import-node solved our problem. I developed a component which shows the tabular representation of any…. It'd be handy to see the rest of the code to understand the context, but things to look at are correct type in any containing script tag (like text/babel or text/jsx), correct component import syntax, using pragma in older versions of React. Join GitHub today. js, I set the "transorm" option with babe. Import not transpile with babel-jest #3202. json pointing at the untranspiled (es6, typescript) version of the library. import express from 'express'; ^^^^^ SyntaxError: Unexpected token import. I developed a component which shows the tabular representation of any…. From James M Snell's. A majority of the MobX users use them. Basically looking for an alternative to 'jdklajsdf'. You would probably get a syntax error: Unexpected token import and this is because we are using ES2015 syntax inside the configuration file and we do not let Babel process the file first. jsx Line 1: Unexpected token You may need an appropriate loader to handle this file type. bien que import fasse effectivement partie de ES6, il n'est malheureusement pas encore pris en charge dans NodeJS par défaut, et n'a que très récemment atterri prise en charge dans les navigateurs. babelrc, are already implemented in my project. Welcome WebStorm 2017. In your code, node can not handle es module. What's going wrong?. I ran into a similar issue when migrating from babel 5 to babel 6. js and answer questions. npm install -g babel-core npm install -g babel-cli npm install babel-core //install to babel locally, is it necessary? and run by. By default, Babel transpiles ES6 import statements to CommonJS. mjs import {add} from '. js, start your app as node start. Or, you can transpile your code on-the-fly by passing -r babel-register to Node. you can go to babel setup page and select your test framework then it helps you to integrate test framework with babel step by step. why do i get "unexpected token import" ??? Posted 2 years ago by irwan_up. Uncaught SyntaxError: Unexpected token import. Learn more about Teams. babel-node js. Currently I’m just using npm scripts (babel src -d dist --watch) to get the desired behavior, but it’d be nice if it were baked into File Watchers. npm install -g babel-core npm install -g babel-cli npm install babel-core //install to babel locally, is it necessary? and run by. The other option that we have is to transpile the code that uses the export/import syntax using Babel. OK, I Understand. test_entry. If you were using the regular style-loader this would be sufficient to ensure the styles were injected into the head of the html document. Grunt, WebPack, etc. Hi Everyone! Currently I'm trying to integrate the testing framework for ReactJS which is called as Jest. js babel-jest. ES6 import from "Unexpected token import" Follow. js application. next feature. indexOf('d') !== -1 that works with the latest Babel. Problems with module parsing using babel-loader · Issue #162 · babel/babel-loader. Without any configuration options, @babel/preset-env behaves exactly the same as @babel/preset-es2015, @babel/preset-es2016 and @babel/preset-es2017 together (or the deprecated babel-preset-latest). Using ES6 and ES7 in the Browser, with Babel 6 and Webpack posted in ES6 , Javascript , Meta , React on November 10, 2015 by James K Nelson This guide is part of The Complete Guide to ES6 with Babel 6 series. If none then we need to install it. My current goal is to see what it takes to get going with Aurelia and ASP. We use cookies for various purposes including analytics. In addition, make sure that babylon (babel dependency) is at least 6. js points to "import Util from ‘. Seem's like you've not installed the babel-preset-es2015, since the import feature is not implemented in the default babel-preset (it's not a confirmed standard yet). The solutions offered in other related questions, such as including the proper presets (es2015) in. js babel-jest. 03/06/2019 · Webpack/Babel ES6 error: Uncaught SyntaxError: Unexpected token import 2 Typescript Modules: Uncaught SyntaxError: Unexpected token import when importing module DA: 5 PA: 57 MOZ Rank: 35. 03/06/2019 · Webpack/Babel ES6 error: Uncaught SyntaxError: Unexpected token import 2 Typescript Modules: Uncaught SyntaxError: Unexpected token import when importing module DA: 67 PA: 35 MOZ Rank: 52. Lots of thanks in Advance. When in loose mode these are allowed to be used anywhere. In the code beneath, we utilize import * as calc, which implies it will import all variables this module sends out, as properties of calc. json file to the project directory with some babel dependencies and doing an 'npm install'. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". % npm install --save-dev babel babel-core babel-loader こういうの出る % webpack ERROR in. import browserSync from "browser-sync" ^^^^^ SyntaxError: Unexpected token import 问题解决 Babel 6. Any recommendations on aliasing native Promise to something like BlueBird in Babel 6?. SyntaxError: Unexpected token {// This was happening on line 1 of the first test file… So it seems the ES6 import was not understood and the my code was not being transpiled by babel. node --experimental-modules my-app. I badly need a help. Skibbbi Or, you can transpile your code on-the-fly by passing -r babel-register to Node. I have two projects (lets call them A and B) which. Of course, you would. 安装了: npm install babel-preset-react. We require use Babel. Previously, it was the entire compiler and all the transforms plus a bunch of CLI tools, but this lead to unnecessarily large downloads and was a bit confusing. js babel-jest. Basically looking for an alternative to 'jdklajsdf'. I just import its in different pages. Intellij Unexpected Token Import 誤った理解でしたのでタイトルと内容を修正いたしました。 babel-eslintをパーサーに指定することにより、解決できる。. However the react app throws an “Error: Network Error”. NET Core now that both are RTM. Based on this, on latest configurations you must use/replace your Plugins/Preset of es2015 and any esX to the new one: env. You need the es2015 presets in webpack. In our webpack configuration, we specified that we are using a babel-loader. We require use Babel. We use cookies for various purposes including analytics. x之后的版本才支持ECMAScript Modules 和 imort 语法 目前,node稳定版本是v8. babel-config is Bourne shell script that the configure creates in the bin directory. The other option that we have is to transpile the code that uses the export/import syntax using Babel. If you have JavaScript files that are transformed by Babel, you can enable support for Babel by installing the babel-jest plugin. Hello, in WordPress cart I get a "SyntaxError: Unexpected token" in. babelrc file at the root of your project if you don't already have one. you can go to babel setup page and select your test framework then it helps you to integrate test framework with babel step by step. This problem has popped up in all of them recently, but I haven't yet been able to track it down. 报错如下: import browserSync from "browser-sync" ^^^^^ SyntaxError: Unexpected token import. Configuration Languages webpack accepts configuration files written in multiple programming and data languages. Uncaught SyntaxError: Unexpected token u in JSON at position 0 at JSON. js to arrange it to the code Node. We require use Babel. js application. js, I set the "transorm" option with babe. js works for me, but when I run node dist/main. Babel-register. I will share my setup for babel 6: Ensure you have the following babel 6 devDependencies installed. import co from 'co'; ^^^^^ SyntaxError: Unexpected token import Then i tried to use babel. 03/06/2019 · Webpack/Babel ES6 error: Uncaught SyntaxError: Unexpected token import 2 Typescript Modules: Uncaught SyntaxError: Unexpected token import when importing module DA: 67 PA: 35 MOZ Rank: 52. it's not plain JavaScript. If you have JavaScript files that are transformed by Babel, you can enable support for Babel by installing the babel-jest plugin. import postgres fr. 03/06/2019 · Webpack/Babel ES6 error: Uncaught SyntaxError: Unexpected token import 2 Typescript Modules: Uncaught SyntaxError: Unexpected token import when importing module DA: 5 PA: 57 MOZ Rank: 35. I want to run it via PM2. Although ASI allows for more freedom over your coding style, it can also make your code behave in an unexpected way, whether you use semicolons or not. $ npm install --global babel-cli # or $ npm install --save-dev babel-core. babelrc and webpack. Without any configuration options, @babel/preset-env behaves exactly the same as @babel/preset-es2015, @babel/preset-es2016 and @babel/preset-es2017 together (or the deprecated babel-preset-latest). Vue中单独的文件报错Unexpected token import 06-21 阅读数 3571 这是因为浏览器不支持import,使用babel将es6转化为es5 博文 来自: weixin_38098192的博客. Uncaught SyntaxError: Unexpected token u in JSON at position 0 at JSON. /config' import Express from 'express' import bootstrap from '. import foo = require() and export = foo) These omissions are largely based technical constraints in Babel’s single-file emit architecture. In the code beneath, we utilize import * as calc, which implies it will import all variables this module sends out, as properties of calc. ` import Navvy from '~components/Navvy' import Skills from '~components/Skills' import Slides from '~components/Slides' import About from '~components/About' import Quotes from '~components/Quotes' export default. The above problem can be solved by installing babel-plugin-syntax-class-properties. babel-node js. js and restart the npm run dev -task. How to (not) use decorators. In order to achieve this we need to install the appropriate Babel plugin: npm i --save-dev transform-es2015-modules-commonjs. babelrc, we need to add the "react" preset. 安装了: npm install babel-preset-react. js app with 'react-redux-starter-kit' which include Webpack. Update: In Node 9, it is enabled behind a flag, and uses the. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. webpackconfigjs自定义alias import js提示Unexpected token export:(依赖都已经安装好了的)webpack. That's what's happening: Your webpack is set to run babel loader only in the src folder (include directive). Please keep in mind that up until a week ago, this configuration was working successfully in several projects, so I am assuming it's a regression and figured I should report it. In the code beneath, we utilize import * as calc, which implies it will import all variables this module sends out, as properties of calc. Babel 6 CLI: Unexpected token export? Ask Question "unexpected token import" in Nodejs5 and babel? 79. And by default, when using exports with babel a non-enumerable __esModule property is exported. We require use Babel. unexpected token import during npm start in react I am learning react and created a mock up project but when I run the project I get the following error,my webpack. I am running 2 basic tests, one working fine, other giving this error:. When WEB-28856 is fixed, will I be able to go back to simply using "import from 'flowtiny1'" ? (i. js and restart the npm run dev -task. node --experimental-modules my-app. Gulp, Vue, Webpack, Babel and Uncaught SyntaxError: Unexpected token import I've been trying whole day to get it to work without any luck so if someone could shine some light that would be very much appreciated. First, we'll install isparta, which is designed to be used with Istanbul with Babel and Karma/Karma Coverage: $ npm install --save-dev isparta isparta works as a custom instrumentor, which must. I created my own npm package. Тур Начните с этой страницы, чтобы быстро ознакомиться с сайтом. How to fix "Certificate with thumbprint null not found in certificate store null" when trying to get plaintext from encrypted columns-sql server?. Of course, you would. brendonco opened this issue Mar 24, Unexpected token import at ScriptTransformer. ajax(function(){n})n应该是$. Those configuration files were merging and the result wasn't the expected. Версия ноды 8. Are you looking for a simple way to get started on making php phalcon and vue. json Why not just set NODE_PATH? While setting NODE_PATH=app is a perfectly valid solution, babel-resolver is more explicit and lets you avoid mucking around with environment variables. Unexpected token import. Note that in this case the babel settings are only applied for the quokka file compilation. I make a react project. The second suggestion to do "import from 'flowtiny1/index. Any ideas on how to use ES6 on WebStorm 10? Here's what I have done so far: Installed Babel. Currently webpack seems to fail parsing JavaScript code that contains ES6 syntax like generators. js with our ES6 code file. x版本开始把转换功能默认关闭。. 一个ReactJS的项目,之前正常运行的。 后来去重新npm install后再去npm run build结果出错:. So we do not want node on the server to process those files at all. i have tried to create a small project with simple test cases and wallaby. It seems that Jest is missing the babel configuration in my package. 在学习“Nodejs开发框架Express3. Seem's like you've not installed the babel-preset-es2015, since the import feature is not implemented in the default babel-preset (it's not a confirmed standard yet). Fork it! Create your feature branch: git checkout -b my-new-feature; Commit your changes: git commit -am 'Add some feature'. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". js Runtime" document. By default, Babel transpiles ES6 import statements to CommonJS. 0 my code: import recast from 'recastai' and the error. UPDATE : thank for your answer, I have just understood what's going on, it's my nodemon server which crash alone when I save any data. 03/06/2019 · Webpack/Babel ES6 error: Uncaught SyntaxError: Unexpected token import 2 Typescript Modules: Uncaught SyntaxError: Unexpected token import when importing module DA: 67 PA: 35 MOZ Rank: 52. SegmentFault 思否 为开发者提供问答、学习与交流编程知识的平台,创造属于开发者的时代!. I have been searching about this issue for quite sometime and couldn't find any solution. He's decided to put AirPair to the test, by rebuilding airpair. js # configure login templates server/ fixtures. I had the same problem. See browser compat table on MDN and this Node issue. import co from 'co'; ^^^^^ SyntaxError: Unexpected token import Then i tried to use babel. Vue/Typescript/Jest - Jest Unit Test SyntaxError: Unexpected token import. OK, I Understand. A place to chat about Next. As node is trying to process less-css-scss file. And that's all, from now on, instead of running node server. I ran into a similar issue when migrating from babel 5 to babel 6. 一个ReactJS的项目,之前正常运行的。 后来去重新npm install后再去npm run build结果出错:. ドラフトですので、es2015にもes2016にも含まれていません。Babelではstage-2のpresetを読み込むか、個別でpluginを読み込む(上のBabelのClass proertiesのリンク先参考)必要があります。必要なモジュールを読み込み、babelのpreset周りの設定を書き換えてください。. json file to the project directory with some babel dependencies and doing an 'npm install'. We believe that most users will find this experience to be totally acceptable. I developed a component which shows the tabular representation of any…. The above problem can be solved by installing babel-plugin-syntax-class-properties. babel-node my. js npm run dev报错,Unexpected token importvue init 11-13 阅读数 5106 你这明显是babel没有起作用,还在es6的语法在浏览器当中运行。. Installing babel-plugin-dynamic-import-node solved our problem. Gulp, Vue, Webpack, Babel and Uncaught SyntaxError: Unexpected token import I've been trying whole day to get it to work without any luck so if someone could shine some light that would be very much appreciated. I've installed babel-register, babel-preset-es2015, and babel-preset-stage-2, and added this to my project's package. UNEXPECTED TOKEN 'import' What's Going on? What exactly a module is is not exactly known. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". I have this code from the website, informing me how to setup the WebAuth function of Auth0. In your code, node can not handle es module. Reactjs - unexpected < token If this is your first visit, be sure to check out the FAQ by clicking the link above. A majority of the MobX users use them. The other option that we have is to transpile the code that uses the export/import syntax using Babel. javascript - React webpack / browserify "unexpected token" I have this npm module that I created and every time I try to include it to see if it works I get this error: Unexpected token. See browser compat table on MDN and this Node issue. It'd be handy to see the rest of the code to understand the context, but things to look at are correct type in any containing script tag (like text/babel or text/jsx), correct component import syntax, using pragma in older versions of React. [/r/rcbredditbot] Unexpected token import with Jest (babel-eslint not available from tested file, symlink env) (from /r/reactjs) If you follow any of the above links, please respect the rules of reddit and don't vote in the other threads. If your current directory is the top directory of the Babel distribution, normally you can invoke babel-config as follows: % bin/babel-config --version-full 3. This section explains how to use them, or how to avoid them. Received 'Uncaught SyntaxError: Unexpected token import' when executing Karma and Jasmine Test by noobiehacker Last Updated March 04, 2017 00:26 AM 0 Votes 2 Views. Currently I'm just using npm scripts (babel src -d dist --watch) to get the desired behavior, but it'd be nice if it were baked into File Watchers. We believe that most users will find this experience to be totally acceptable. Basically looking for an alternative to 'jdklajsdf'. This has been fixed for upcoming 2. /src/js/app/app. Dealing with optional callbacks or event handlers. com/ijdickinson/vue-cli-jest-problem Steps to reproduce This is a similar problem to 1475, but I can't find a way. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. babelrc file (or "babel": {} section in your package. And by default, when using exports with babel a non-enumerable __esModule property is exported. Previously, it was the entire compiler and all the transforms plus a bunch of CLI tools, but this lead to unnecessarily large downloads and was a bit confusing. Advantages of using decorator syntax: Minimizes boilerplate, declarative. Where does this babel-loader come from you ask? Well, we need to install it and later set a few configurations. js file code is as follows, module. npm install -g babel-core npm install -g babel-cli npm install babel-core //install to babel locally, is it necessary? and run by. ES6 import from "Unexpected token import" Follow. That may be because of babel. What's going wrong?. Welcome WebStorm 2017. com/ijdickinson/vue-cli-jest-problem Steps to reproduce This is a similar problem to 1475, but I can't find a way. import express from 'express'; ^^^^^ SyntaxError: Unexpected token import. import express from 'express'; ^^^^^ SyntaxError: Unexpected token import What's wrong ? I thought that Node v4+ supports most ES6 features (well, at least ES6 modules since they are very popular and useful). If you have JavaScript files that are transformed by Babel, you can enable support for Babel by installing the babel-jest plugin. cymen commented on 18 Dec 2015 After rereading your initial post, the simple solution is to just have application. You could either eject create-react-app to add it yourself, set up your own environment from scratch, or use something like mobx-react-boilerplate as your starting point. “How to debug ES6 NodeJS with VSCode” is published by katopz. babelrc, are already implemented in my project. The export statement is used when creating JavaScript modules to export functions, objects, or primitive values from the module so they can be used by other programs with the import statement. I created my own npm package. js代码提示错误依赖全部安装好了的。. json Why not just set NODE_PATH? While setting NODE_PATH=app is a perfectly valid solution, babel-resolver is more explicit and lets you avoid mucking around with environment variables. js work in harmony? No theory just code examples? If you have worked on php phalcon and worked a bit on vue. Babel makes this a lot easier for us by providing babel-node, a command-line tool which we can use directly to launch Node. By default, Babel transpiles ES6 import statements to CommonJS. We use cookies for various purposes including analytics. js "use strict"; import http from "http"; import cluster from "cl. npm install -g babel-core npm install -g babel-cli npm install babel-core //install to babel locally, is it necessary? and run by. Overriding Babel Configuration File Location. npm install -g babel-core npm install -g babel-cli npm install babel-core //install to babel locally, is it necessary? and run by. > yarn add babel-loader babel-core babel-preset-es2015 babel-preset-react --dev. babelrc file at the root of your project if you don't already have one. json was using "webpack-dev-server" instead of "webpack" and this was breaking stuff. I ran into a similar issue when migrating from babel 5 to babel 6. I have installed alasql using package. These plugins only allow Babel to parse specific types of syntax (not transform). it's not plain JavaScript. log(a) } console. I tried @babel/plugin-syntax-dynamic-import and babel-plugin-dynamic-import-node but didn't work. exports format and need to switch to the new import/export. babelrc, are already implemented in my project. js with babel-node , but since the project has no. I will share my setup for babel 6: Ensure you have the following babel 6 devDependencies installed. In this post, we'll go through the steps of setting up two basic React components that use ES6 features, use Babel to transpile them to ES5 and bundle them using Webpack. How To Enable ES6 Imports in Node. | import React, { Component } from 'react'; | import ReactDOM from 'react-dom'; 解…. I was just running babel to compile the src to lib folder babel src --out-dir lib. ensure, for Webpack. The import statement cannot be used in embedded scripts unless such script has a type="module". I created my own npm package. 10 is supported in Lambda. In addition, make sure that babylon (babel dependency) is at least 6. Unexpected token } JavaScript SharePoint2013. js alias配置如下:引入js的代码:lib. babelrc' file to the truffle project directory. Babel unexpected token import when running mocha tests Sorry if this is a duplicate. javascript - React webpack / browserify "unexpected token" I have this npm module that I created and every time I try to include it to see if it works I get this error: Unexpected token. ", despite it being already configured. $ npm install --global babel-cli # or $ npm install --save-dev babel-core. Currently I'm just using npm scripts (babel src -d dist --watch) to get the desired behavior, but it'd be nice if it were baked into File Watchers. % npm install --save-dev babel babel-core babel-loader こういうの出る % webpack ERROR in. @babel/plugin-transform-es2015-classes became @babel/plugin-transform-classes. Disadvantages of using decorator syntax: Stage-2 ES. may be your test script write this:.