Jest Unexpected Token

6 and WordPress 4. I am trying to run some very simple tests on react components with Jest. AN ISLAND STORY CHAPTER 1 THE STORIES OF ALBION AND BRUTUS. If you want to dive right in and start playing with single-file components, check out this simple todo app on CodeSandbox. Refactored code to catch only particular exceptions, not the general ones. , the module author is the creator and vendor of the library. Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. 1) idziesz do preferences > themes, scrollujesz w dół i jest opcja do wyłączenia mobilnej wersji strony. transpileModule, you may use the isolatedModules setting to make Wallaby do the same. org projects that bundle their own library; i. Vue CLI has built-in options for unit testing with Jest or Mocha that works out of the box. rewire unexpected token import (4) If I use import/export from ES6 then all my jest tests fail with error: Unexpected reserved word. Tableau can help anyone see and understand their data. If you only have one file named wallaby. Moreover, this first constituent of greatness consists in two things, in accounting the right alone as good, and in freedom from all disturbing passions: Edition: current; Page: [43] for to hold in light esteem, and on fixed and firm principles to despise, objects which to most persons seem excellent and splendid, is the token of a brave and. In your case, lodash-es specifically exposes ES modules, which will need to be built by Jest via babel. NET 4 (with MVC 4 or 5), and ASP. it's not plain JavaScript. 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. setState calls don’t look asynchronous, and naively calling setState introduces very subtle bugs. This may take a few minutes to. Tableau can help anyone see and understand their data. Babel isn't putting it into a format that jest is able to properly test. Setting it up is quite simple, and the tests run very quickly. With Authenticator, your phone provides an extra layer of security on top of your PIN or fingerprint. Manual testing is usually slow, tedious and error-prone, which is why end-to-end testing is important — we need a way to automate testing across different browsers and platforms. I’m about to show you how to do something in React. This property is used to submit the GitHub access token. Migrating from JavaScript. FAIL test /Logo. That unexpected token, <, is a strong clue that the response was HTML instead of JSON. where my-app is the name of the folder for your application. I have a Python program, it has lots of 'print' statements that print stuff to output constantly. To have the best user experience on our site please consider upgrading to Google Chrome or Mozilla Firefox. Also see watchman troubleshooting. The "Configuring Jest & Babel" Lesson is part of the full, Testing React Applications, v2 course featured in this preview video. Transformation / Chaining. In essence, memory leaks can be defined as memory that is not required by an application anymore that for some reason is not returned to the operating system or the pool of free memory. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". Please see the Modules documentation for more information. This option is a short hand for the most strict JSHint configuration as available in JSHint version 2. ← Back to all posts 5. flat is not a function only with jest. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. The Visual Studio Code editor supports React. Latest announcements Follow me on twitter - @Chribba About EVE-Offline EVE-Offline continously monitors the various game-server of the EVE-Online universe collecting player statistics and server information from our much beloved MMORPG/FPS. setState is asynchronous. Customer evaluation - Providing evaluation and pre-sales opportunities. NET Core MVC. My book, each recipe has a little symbol together with it whether it's properly "food combined" within explained elsewhere in guide is designed to and there is not one recipe in the dessert section that has that token. match returns true , will do this. Install Jest. Installation. The later is preferred since it’s more customizable, but it depends on your needs and preference. I am running into problems because of this line at the top of my component file. Note that the detail message associated with cause is not automatically incorporated in this exception's detail message. 1) idziesz do preferences > themes, scrollujesz w dół i jest opcja do wyłączenia mobilnej wersji strony. [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. LCS is a Microsoft Azure-based collaboration portal that provides a unifying, collaborative environment along with a set of regularly updated services that help you manage the. vue components, we're entering the realm of advanced JavaScript applications. There are two types of overflow errors; one has to do with the internal memory stack of the program, and the other has to do with the amount of memory used to store data. You will never be able to tell how it’s going to turn out. If you want to dive right in and start playing with single-file components, check out this simple todo app on CodeSandbox. 0 on GitHub (npm) Changelog Welcome to the 0. The below code works fine in. Jest is easy to use on a Lerna repo with a bit of config. This response started with a < (hence the "Unexpected token <"). " After this encounter, he may be found within the Falkreath Sanctuary or the Dawnstar Sanctuary, depending on the. Parameterized Build. When it starts to talk about unit-tests, people found themselves mixing different paradigms, they don't know, which part of exact component is tested. This worked well until I tried running yarn test. Although the Interkosmos expansion is "just" a part of a card game, which is far less production-complicated than heavy board games, there still may be issues awaiting. Ask coding questions. Jest is a low-configuration testing harness popular in React applications, and for good reason: in vanilla JavaScript, it mostly Just Works™. Let’s see how we can use. Unit testing with Jest. In the book_mast table, the publishing language of some book have not been set, therefore when we select book_mast, the pub_lang column displays NULL values, which is not meaningful for the reporting purpose. That unexpected token, <, is a strong clue that the response was HTML instead of JSON. Surface devices. Babel isn't putting it into a format that jest is able to properly test. Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. Best of 2013: An Undeserved Gift – A Pro Tour Champion’s Report Best of 2013: Crashing into the Top 8 of Pro Tour Gatecrash Best of 2013: Video Deck Tech - Unexpected Results The Blood Baroning of Madison: A Champion Returns. Visit the Apple site to learn, buy, and get support. Not being paid to say that, just giving props to the @jetbrains team. ← Back to all posts 5. You can easily use Node. Do you have the most secure web browser? Google Chrome protects you and automatically updates so you have the latest security features. it 's not plain JavaScript. SafeCharge Limited is an Electronic Money Institution authorised and regulated by the Central Bank of Cyprus and is a principal member of Mastercard, Visa and Unionpay International (CUP). Using Jest with TypeScript takes a little more effort. The UNEXPECTED_KERNEL_MODE_TRAP bug check has a value of 0x0000007F. The size parameter counts the number of top level keys inside the JSON object. This trap could be a bound trap (a trap the kernel is not permitted to catch) or a double fault (a fault that occurred while processing an earlier fault, which always results in a system failure). Pricing for Maps, Routes, and Places Pricing for our core products is pay as you go and you only pay for what you use. If you have a class named SomeClassY, then your test class should be named SomeClassY_Tests. Port Manteaux churns out silly new words when you feed it an idea or two. ts 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. I have read all three of her published novels and given each 5-star reviews! I have read all three of her published novels and given each 5-star reviews!. Happy React testing with Jest! Related resources: React workflows without Create React App. AN ISLAND STORY CHAPTER 1 THE STORIES OF ALBION AND BRUTUS. To have the best user experience on our site please consider upgrading to Google Chrome or Mozilla Firefox. This is particularly useful when forming basic logical blocks or writing out method argument lists, since the editor will often automatically provide the necessary syntax surrounding your code snippet. Migrating from JavaScript TypeScript doesn't exist in a vacuum. We had an unexpected tour of the outside of the stadium, as our online tickets weren't valid at the turnstiles and we had to walk all around the ground to get replacements. Instead, develop good habits with TypeScript, dependency injection, and unit tests while doing something fun: Creating your own Discord bot from scratch!. A token is a unique string that can be assigned to an individual user. Moodle is a Learning Platform or course management system (CMS) - a free Open Source software package designed to help educators create effective online courses based on sound pedagogical principles. To summarize, there are 3 issues when using setState:. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Have a look at the "What is React Testing library?". This property is used to submit the GitHub access token. I've set it up, because the React team is using it. A node is a MathML text integration point if it is one of the following elements:. Yeah yeah — so how do I do that? Well I am glad you asked. For more information on honey token accounts, see Install ATA - Step 7. A 302 Found message is an HTTP response status code indicating that the requested resource has been temporarily moved to a different URI. On the other hand I use the classic TestCase for unit testing Django and the REST framework APIClient for testing the API. Another place where Jest may throw Unexpected token is on @ when using in @connect (meets in majority of tutorials). Providing The Interceptor. Synonyms for surprised at Thesaurus. Instead, develop good habits with TypeScript, dependency injection, and unit tests while doing something fun: Creating your own Discord bot from scratch!. 0 are parsed differently. Now available, our revolutionary Software as a Service CRM product, Suite:OnDemand , means the end of per-user charging and the end of charging for premium. Jest is easy to use on a Lerna repo with a bit of config. This is a fun, push-your luck game with a betting element, in the vein of games like Incan Gold. js with Bitbucket Pipelines by using one of the official Node. Every week we (moderators) will pick a repl from Share that we think is amazi. ESLint is designed to be completely configurable, meaning you can turn off every rule and run only with basic syntax validation, or mix and match the bundled rules and your custom rules to make ESLint perfect for your project. Refactored code to catch only particular exceptions, not the general ones. I decided to go with Jest for no personal preference, I just noticed that vue-cli ships with it and went for it. This component also import's a quasar component. it's not plain JavaScript. This may take a few minutes to. Use Unity to build high-quality 3D and 2D games, deploy them across mobile, desktop, VR/AR, consoles or the Web, and connect with loyal and enthusiastic players and customers. For more information on honey token accounts, see Install ATA - Step 7. In Selenium Webdriver, locators like XPath, CSS, etc. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". I upgraded my project from the PRO version downloaded as *zip folder to an installation with npm and my received gitlab account. Build powerful, scalable applications, with minimal overhead and full out-of-the-box functionality - your code, your way. createTransformer({ rootMode: "upward", }); and with that saved somewhere, you'd then use that file in the place of babel-jest in your Jest options via the transform option:. An automatic detection of Imagify, Shortpixel, EWWW & Optimus is included (). ts with the following contents:. More secure. Preact is a fast 3kB alternative to React with the same modern API. TypeScript doesn’t exist in a vacuum. The Visual Studio Code editor supports React. The Jest documentation provides more details on using identity-obj-proxy to solve this problem directly, and I recommend that you use that library instead of this one. Lerna Manages the Mono Repo. I developed a component which shows the tabular representation of any…. CRISPR-Cas9 is poised to become the gene editing tool of choice in clinical contexts. What exactly does that mean? Best Wishes. Here's what you can do:. Packages are shipping ES6 by default, and denoting commonjs files with a. Install Jest. While Jest is most of the time extremely fast on modern multi-core computers with fast SSDs, it may be slow on certain setups as our users have. However, there are valid reasons why developers compare the two. Converting a JavaScript codebase over to TypeScript is, while somewhat tedious, usually not challenging. In our case, this second operation is synchronous, but it might just as easily have been an asynchronous operation. Look at the classics SinonJS, it can test everything from every perspective. All configuration of code works fine. By default, Wallaby TypeScript compiler works as a post-processor (using stateful TypeScript Language Service). In order to get my tests to work with the default mocks is to mock all of the lodash functions in the generator. Using ES6 `import` in tests with Jest and Rollup Apr 15, 2017 20:28 · 254 words · 2 minutes read es6 jest rollup babel Today while working on a new version of Preliminaries using ES6 I was trying to get both Rollup working to bundle my code and Jest to run tests when import ing my code. eat is commonly used for optional operators, like * in generator function, ; at the end of statements, and ? in typescript types. Let’s see how we can use External tools to run ESLint autofix and React Native. file to find any unexpected behavior in signature verification. Codecov provides highly integrated tools to group, merge, archive and compare coverage reports. Jest CSS Modules. Jest encountered an unexpected token ReactJS Updated November 01, 2018 11:26 AM. It supports both ASP. In this post we'll see how to perform HTTP requests using it. Exception Handling Mixins Jest Cypress Tools Unexpected token *. code is not a function (Summernote) knitr kable and “*” Monitor incoming IP connections in Amazon AWS; Scala Class body or primary constructor body. have one test with isOpen truthy,. Hashnode is one of the fastest-growing developer communities with more than 500K+ monthly active developers from 180+ countries worldwide. it's not plain JavaScript. If you’re working on any type of web site or web application that has any other dependencies either for its front-end framework – such as Bootstrap and Foundation – or from the site’s foundation – such as Rails or WordPress – there’s a chance that your own JavaScript sources may result. I'm using Cypress for UI tests in project A and TestCafè for UI tests in project B. js in your project root, wallaby will automatically select it. Lerna is a fantastic library for managing a mono repo. Hi guys! I’ve been trying to set up my build with npm to run jest for testing. JavaScript can be a nightmare to debug: Some errors it gives can be very difficult to understand at first, and the line numbers given aren't always helpful either. Often, Unexpected Token errors are just due to an accidental typo, but to help avoid these, it is quite beneficial to use a code editor that provides some form of auto-completion. FAIL test /Logo. Documentation. Configuration. Axios is a promise-based HTTP client that works both in the browser and in a node. All configuration of code works fine. I am trying to run some very simple tests on react components with Jest. NET 4 (with MVC 4 or 5), and ASP. I've a couple of medium-to-bigger projects right now. Learn how to make Websites and JSON APIs, so you can make web apps, phone apps, and more. Some people say that testing React components is useless and in many cases it is, but there are a few cases when I think it's useful: component libraries, open source projects, integration with 3rd party components, bugs, to prevent. Manual testing is usually slow, tedious and error-prone, which is why end-to-end testing is important — we need a way to automate testing across different browsers and platforms. The Visual Studio Code editor supports React. Did you know that you can easily run many command line tools from WebStorm with just a shortcut? Well, now you do! No need to go to the Terminal, thanks to the feature called External tools. I have read all three of her published novels and given each 5-star reviews! I have read all three of her published novels and given each 5-star reviews!. Kazakhstan officially allows freedom of religion, but religious leaders who oppose the government are suppressed. Understanding module. More secure. However, there are valid reasons why developers compare the two. I'm attempting to run a simple twitterbot using the twit library and foreverThe bot essentially watches another twitter account, and copies its tweets with some modifications. The stack is used to store internal data for the program and is very. Unexpected token import with Jest (babel-eslint not available from tested file, symlink env) 2 Jest vs React: module exports and "Jest encountered an unexpected token". exports and exports in Node. Makes a request over http/https to the publisher's server, passing the document identifier, authentication token, and some data about the context in which the document is being opened. Configuring ESLint. Korzystając z kursów i poradników napisałem poniższą instrukcję. The newsletter is offered in English only at the moment. Configuration. Karma is a direct product of the AngularJS team from struggling to test their own framework features with existing tools. I desired to be sure of it, but did not dare to feel sure, especially as he told me that he had only heard it from some one else, and as the strangeness of the news impaired the credit of the story. We’ve already laid the foundation — freeing you to create without sweating the small things. Does your version of Ruby on Rails still receive security updates? Rails LTS provides security patches for old versions of Ruby on Rails (3. I am trying to run some very simple tests on react components with Jest. Press the Xbox button to open the guide, then select System > Xbox Assist. However, it will assume the entry point of your project is src/index and will output the result in dist/main. It isn't always necessarily a perfect food using. If you only have one file named wallaby. js) to use Babel to handle modules only in test mode, but esm does the work everywhere else. Buy & download the game here, or check the site for the latest news. Module resolution is the process the compiler uses to figure out what an import refers to. See the following query:. Jest encountered an unexpected token. directeur sportif for team sky at this year's tour was nicolas portal who gave thomas an answer similar to that espoused by dave brailsford when asked how he might fit into the team strategy. org projects that bundle their own library; i. Create a free website or build a blog with ease on WordPress. An automatic detection of Imagify, Shortpixel, EWWW & Optimus is included (). This option is a short hand for the most strict JSHint configuration as available in JSHint version 2. In order to support e. If the value of the data parameter is a plain object, it is converted to a string and url-encoded before it is appended to the URL. JavaScript is quickly becoming the go-to language for web developers. js IntelliSense and code navigation out of the box. Data that is sent to the server is appended to the URL as a query string. I am trying to run some very simple tests on react components with Jest. json under the jest property, or in its own jest. 20+ Perfectly Timed Photos That Will Make You Look Twice If owning a camera makes someone a photographer, then everyone who owns a frying pan is a chef. But just writing tests is not enough by itself, knowing the kinds of tests to write and how to structure code to conform to this pattern is what it's all about. babel-loader exposes a loader-builder utility that allows users to add custom handling of Babel's configuration for each file that it processes. They also follow the facebook/jest convention of putting tests next to the files they are testing: Introducing expect-jsx. Isolated development - Development environment for use by operation and architects. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". The main part is creating a custom jest transformer file that wraps babel-jest's default behavior in order to set the option, e. SyntaxError: Unexpected token import This is because gatsby-browser-entry. 安装了: npm install babel-preset-react. You can easily use Node. export default considered harmful. js and in the browser, making asynchronous testing simple and fun. TypeScript supports object-oriented programming features like classes, interfaces, etc. SyntaxError: Unexpected token import" See… So Babel doesn't actually do anything you need to compile or rather transpile the code into an ES5 format that the target environment understands. These ways may reduce the chance of leaking memory. You can choose not to configure Jest out of the box and it will Just Work™, but we did apply some configuration in the form of a jest. "128-bit keys mean good security. To have the best user experience on our site please consider upgrading to Google Chrome or Mozilla Firefox. The dead man in the lyric, Petty had told Rolling Stone a few days before, was Milwaukee’s Howie Epstein, bassist and harmony singer in the Heartbreakers for 20 years. 1) idziesz do preferences > themes, scrollujesz w dół i jest opcja do wyłączenia mobilnej wersji strony. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". via Twitter This is why @WebStormIDE is the best: Within 2 hours of reporting an issue on Twitter, they investigated, reproduced, opened a bug tracker ticket, and suggested a work-around which negates the problem while the bug gets fixed. Online Dictionaries: Definition of Options|Tips Options|Tips. First I tried to test simple preexisting form elements that we had put together at our company. Jeżeli chcesz, możesz również wyedytwać plik footer. The art of photography is not about pushing a button on an expensive SLR. If the resource is true (or the menu item enabled), xterm provides its selection to the CLIPBOARD. If I run my tests I receive this errors:C:UsersmytecProjektedhbw-projekt-2017node_modulesng-mdb-pr. In your case, lodash-es specifically exposes ES modules, which will need to be built by Jest via babel. Have a look at the "What is React Testing library?". In the ESLint Package field, specify the location of the eslint or standard package. The Jargon File is a common heritage of the hacker culture. yarn add --dev @types /jest @types /react @types /react-native @types /react-test-renderer We saved these declaration file packages to our dev dependencies because this is a React Native app that only uses these dependencies during development and not during runtime. The Google Maps Platform is a set of APIs and SDKs that allows developers to embed Google Maps into mobile apps and web pages, or to retrieve data from Google Maps. If the JSON object was parsed successfully, the validate parameter will be set to true. This means the match query can search text fields for analyzed tokens rather than an exact term. If you set some state, than take a look at it, you will still see the old state. We’ve already laid the foundation — freeing you to create without sweating the small things. 2 answers 28 views 0 votes. Passwords can be forgotten, stolen, or compromised. If the value of the data parameter is a plain object, it is converted to a string and url-encoded before it is appended to the URL. Where communities thrive. Error: Unexpected request: POST Karma-jasmine-angular the actual scenario is like when I am trying to test my angular js controller and service together in which first I call a get ajax request and on its success I call a user service which also contains a post ajax request. net we applications. A question will arise during these moments. Jest Karma Mocha React Native Lab Tape and AVA Installation Using enzyme with JSDOM. React Native combines the best parts of native development with React, a best-in-class JavaScript library for building user interfaces. js® and NPM on Windows. How to test if element. What are the difference between windows JVM and Android JVM (java virtual machine). You can use React Native today in your existing Android and iOS projects or you can create a whole new app from scratch. createTransformer({ rootMode: "upward", }); and with that saved somewhere, you'd then use that file in the place of babel-jest in your Jest options via the transform option:. Drupal 7 only has built-in support for non-external libraries via hook_library(). Unexpected token / & Parsing error: @shakdaniel has nothing to do with jest. Programming languages favor different ways of managing memory. Out of the box, webpack won't require you to use a configuration file. yarn add --dev @types /jest @types /react @types /react-native @types /react-test-renderer We saved these declaration file packages to our dev dependencies because this is a React Native app that only uses these dependencies during development and not during runtime. Hi Everyone! Currently I'm trying to integrate the testing framework for ReactJS which is called as Jest. Adding Jest to an ES5 project (‘Unexpected token’ errors on JSX) So far I’ve been using Jest with ES6 (see here ), but to run Jest tests against React code using ES5, you might get errors when running your test and rendering the JSX. Pricing for Maps, Routes, and Places Pricing for our core products is pay as you go and you only pay for what you use. Microsoft Dynamics Lifecycle Services (LCS) helps improve the predictability and quality of implementations by simplifying and standardizing the implementation process. Specifies the character encodings that are to be used for the form submission. Green was delayed, so once food had been dealt with, we started with the “Feature Game”, Auf Teufel komm raus. This version of the FAQ on Wiki is no longer being maintained, and will eventually be removed. It isn't always necessarily a perfect food using. js applications shouldn't be understated and Jest makes this easier than ever. This worked well until I tried running yarn test. JS Unexpected token import. I'm using Cypress for UI tests in project A and TestCafè for UI tests in project B. Comment on the game itself, atmosphere, stewards, pies, facilities etc. Finally the newly created request object (with the header included) is passed on for further processing by using the next. 20+ Perfectly Timed Photos That Will Make You Look Twice If owning a camera makes someone a photographer, then everyone who owns a frying pan is a chef. Front-end web developers use JavaScript to add user interface enhancements, add interactivity, and talk to back-end web services using AJAX. You will never be able to tell how it’s going to turn out. GitHub Gist: instantly share code, notes, and snippets. Just remember that SSH time eats your build minutes! From there, treat this as a Node problem. Not being paid to say that, just giving props to the @jetbrains team. This can lead to unexpected warnings/errors in when upgrading between minor versions of JSHint. This response started with a < (hence the "Unexpected token <"). json like the Jest docs do, the transform option. Matt is a contributor to WebFundamentals. The only lodash functionality I need to mock at the moment is random(). It enables dynamic loading of ECMAScript modules and is explained in this blog post. In order to get my tests to work with the default mocks is to mock all of the lodash functions in the generator. If you haven't previously confirmed a subscription to a Mozilla-related newsletter you may have to do so. js minified and optimized for production. The art of photography is not about pushing a button on an expensive SLR. js Docker images on Docker Hub. js and in the browser, making asynchronous testing simple and fun. js) to use Babel to handle modules only in test mode, but esm does the work everywhere else. Can somebody hel. For more information on honey token accounts, see Install ATA - Step 7. First I tried to test simple preexisting form elements that we had put together at our company. AN ISLAND STORY CHAPTER 1 THE STORIES OF ALBION AND BRUTUS. Researching this issue in general, it seems to lay with the way babel transpiles such that Jest can understand Quasar. Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases. The following React Redux guide is for JavaScript developers with a good grasp of ES6 and React. If the resource is true (or the menu item enabled), xterm provides its selection to the CLIPBOARD. Moment was designed to work both in the browser and in Node. Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. If you have a class named SomeClassY, then your test class should be named SomeClassY_Tests. Wrong, it's total BS and you know it. Drupal 7 only has built-in support for non-external libraries via hook_library(). I use webstorm 2017. NET languages, focusing specifically on ASP. The main issue I'm running into is that the only module map that will work is one like this:. yarn add vue-test-utils vue-jest jest-serializer-vue -D #or npm install vue-test-utils vue-jest jest-serializer-vue --save-dev 复制代码 其中, vue-test-utils 是最关键的测试框架。 提供了一系列对于Vue组件的测试操作。. A question will arise during these moments. Laravel Vapor is a serverless deployment platform for Laravel, powered by AWS. A class in terms of OOP is a blueprint for creating objects. It's where the people you need, the information you share, and the tools you use come together to get things done. it 's not plain JavaScript. The below code works fine in. This can lead to unexpected warnings/errors in when upgrading between minor versions of JSHint. Using ES6 `import` in tests with Jest and Rollup Apr 15, 2017 20:28 · 254 words · 2 minutes read es6 jest rollup babel Today while working on a new version of Preliminaries using ES6 I was trying to get both Rollup working to bundle my code and Jest to run tests when import ing my code. How to fix Jest "Unexpected token" in package code. ECMAScript modules are completely static: you must specify what you import and export at compile time and can’t react to changes.