Jest encountered an unexpected token export react js file with jest, but it was failing because the component imported a . Jest encountered an unexpected token ReactJS. config and changing the transformIgnorePatterns but not having any success Jan 19, 2021 · Jest encountered an unexpected token - React with jest and enzyme Hot Network Questions The double-angle formula for cosine is expressible in terms of (single-angle) cosine alone; not so for sine. js:21 export {d See full list on dev. yarn add --dev babel-preset-env Jul 9, 2019 · Trying to set up Jest to test my React components (Technically I'm using Preact) but same idea Anytime I try to get a coverage report, I get errors when it hits any jsx syntax. Sep 24, 2019 · Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. As of Aug 23, 2022 the latest version of uuid is still beta and the linked not above indicates it was only tested with the beta 29. Nov 23, 2021 · It seems that it has less to do with the version of the dependencies. TypeScript Jest: Unexpected Token Export I'm trying to run unit tests for a TypeScript project which uses another TypeScript project I've created as a dependency. js, and the last one was close but I was still missing one important thing the imports. Sep 25, 2020 · このカンマを削除したところ、無事にテストが実行できました。めでたしめでたし。 余談. 34 Jul 1, 2021 · Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. エラー元の tsconfig というパッケージについて調べたら TypeScript 公式のものではなく、しかも 3 年前から更新されていませんでした。 Jan 21, 2025 · You signed in with another tab or window. Aug 9, 2023 · - React and Typscript with Jest and React-testing-Library. I'ts like @dean-g pointed out. Dec 29, 2022 · Jest encountered an unexpected token Jest failed to parse a file. Oct 14, 2024 · FAIL __test__/sum. So, finally i've solved this. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. You switched accounts on another tab or window. May 7, 2024 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. and can't seem to find the right nail for this Dec 23, 2020 · but Jest doesn't like it and throws a SyntaxError: Unexpected token 'export' I tried different things, like play around with . The example from Sushruth resolves the issue. Nov 16, 2019 · Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. Sep 13, 2024 · I have created react app with parcel, (New to testing) While doing unit testing for my ContactUs page, I have came across this problem. " Babel7 Jest unexpected token export. it's not plain JavaScript. js: Nov 19, 2023 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. js 运行报错：Error: Export encountered errors on following paths 的错误处理; Jest 和 Jest CLI：使用 Jest CLI 进行测试; 在 Jest 测试中如何使用 Jest-Extended 来扩展 Jest 的断言？ Mar 11, 2019 · The only way I could get this to work for myself was to add: { "targets": { "node": "current" } } So that my presets read: There are several changes that I needed to get this to work. When trying to run tests with Jest in a React app, I get a Jest encountered an unexpected token error. Sep 13, 2023 · Jest encountered an unexpected token. Dec 28, 2022 · Jest encountered an unexpected token Jest failed to parse a file. Sep 4, 2019 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. js:1 ({"Object. Apr 26, 2022 · I'm trying to set up a new project, and simply adding these give me an error: import { configure } from "enzyme"; import Adapter from "enzyme-adapter-preact-pure"; configure({ adapter: new Adapter( Feb 8, 2023 · Test suite failed to run, Jest encountered an unexpected token Hey everyone, I recently imported the @FluentUI\react-charting module into my UX code so I could create a sparkline chart, and everything compiles and renders correctly. The first method works if for some reason you have to import a css file from node_modules directly. E:\Git\node_modules@mui\x-date-pickers\internals\demo\index. Dec 23, 2022 · Jest encountered an unexpected token with SwiperJs. Feb 9, 2024 · Jest encountered an unexpected token. Dec 24, 2023 · You can do so by checking for the following configurations: You're Using the Right Transformer ; You're Using the Right Jest Testing Environment ; You're Using the Right " jsx " Mode in tsconfig. when your code or its dependencies use non-standard JavaScript syntax, or w module. gl/src/react/index. Provide details and share your research! But avoid …. exports = { presets: ['@babel/preset-env', '@babel/preset-react'], }; package. I finally found a workaround for this. 3 to 27. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. Aug 21, 2024 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. /arc. Jul 19, 2024 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Mar 2, 2018 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand You signed in with another tab or window. Reload to refresh your session. Aug 1, 2022 · Add a transform for js which uses babel-jest-- Jest encountered an unexpected token - SyntaxError: Unexpected token 'export' Update my tsconfig to output commonJS modules Update my tsconfig to allowJs:true and update my jest transforms to parse JS with ts-jest I was able to get this working by doing the following: Added NODE_OPTIONS=--experimental-vm-modules to the test script in package. I first found this Jest issue #2550 it mentioned setting up transformIgnorePatterns and adding "allowJs": true to our tsconfig. Jest encountered an unexpected token Jest failed to parse a file. Nov 19, 2020 · Jest encountered an unexpected token. I copied the Link component and test directly from here. css stylesheet. jsx'] to jest. Recently, I added the lightbox. json: Jan 27, 2025 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. ts is still using babel-jest which breaks import/export and the globals/tsconfig path isn't getting generated so jest types aren't recognized. This means that a file is not transformed through TypeScript compiler, e. This happens e. Oct 17, 2018 · I have the same problem for a few days and tried different solutions but they doesn't work for me. Mar 13, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. 13. json . This error occurs because Jest does not support JavaScript ES Modules, and a Node module needs to be transpiled from an ES Module to a CommonJS module. x of jest so I think since I'm just now upgrading from 27. js altered with the new transformIgnorePatterns and transform configurations. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not Sep 25, 2019 · I have a test for a test for a TSX file written in a JSX file which fails to run due to unexpected token: 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. Dec 1, 2022 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. Feb 3, 2023 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Feb 3, 2023 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Sep 12, 2020 · Jest doesn't transform node_modules by default, transforming all third-party modules would result in significant overhead and unexpected results. jsx and added extensionsToTreatAsEsm: ['. Viewed 2k times export default App; Jun 24, 2024 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Dec 25, 2020 · Jest encountered an unexpected token with react-native. when your code or its dependencies use non-standard Sep 11, 2018 · React based application moving unit tests from mocha to jest. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. So the final fix was: Update the imports Aug 26, 2022 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Mar 21, 2019 · Jest encountered an unexpected token, when import new libraries in react } } export default App; [React]Jest SyntaxError: Unexpected token import. module. 1. Jest encountered an unexpected token: What it is and how to fix it. babelrc and some dependencies, moduleNameMapper and transformIgnorePatterns in jest. Tried few solutions, Which are posted on StackOverFlow but none worked for me. The jest encountered an unexpected token can be caused by the inability to configure Jest with creat-react-app, Jest not being able to transform packages, inability to transpile modern JavaScript, circular imports when mocking modules, Jest not able to transform the dependency, and incompatible dependencies after the update. Jun 10, 2021 · With Konva and react-konva installed and imported, my jest@enzyme tests failed to run with this error: Test suite failed to run Jest encountered an unexpected token This usually means that you are Feb 16, 2020 · React Jest causing "SyntaxError: Unexpected token . My case was module federation shared dependencies caused a legacy package's css not to get picked up. Try Teams for free Explore Teams Dec 26, 2023 · Marcus Greenwood Hatch, established in 2011 by Marcus Greenwood, has evolved significantly over the years. js:. However mine was fixed by just modifying package. e. If a component is single, and not importing anything else, "npm test" runs smoothly. It’s known for its simplicity and speed, making it a great choice for testing both small and large projects. I am struck here, Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. 10. Aug 2, 2022 · I was using a jest. Sep 6, 2020 · Fix "Jest encountered an unexpected token" with "create-react-app" # jest # testing # react # javascript Here is one of the most popular question which is related to testing with jest for repo setup with create-react-app as I've seen in stackoverflow community. Aug 2, 2022 · I had the latest version of nx, i. ts Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. Recently, I added DeckGL to my app. Jan 22, 2022 · I'm using jest to test a react TypeScript app. You signed out in another tab or window. 3. x I'll stick with this solution for now. 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. json: Sep 5, 2018 · So I'm trying to write tests on my React Native app with Jest and TypeScript. Jul 14, 2023 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. /DemoContainer'; Test suite failed to run. Mar 17, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. json Renamed the relevant test files from . 3. Getting the following error: I've tried quite a few different plugins, transforms, etc. ":function(module,exports,require,__dirname,__filename,jest){export { DemoContainer, DemoItem } from '. g. json. Feb 17, 2022 · Jest encountered an unexpected token Jest failed to parse a file. Unexpected token 'export' > 2 | import { Swiper, SwiperSlide } from 'swiper/react'; Jest encountered an Sep 10, 2020 · SyntaxError: Unexpected token 'export' Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. There is a common approach to fix such issue. Marcus Greenwood Hatch, established in 2011 by Marcus Greenwood, has evolved significantly over the years. config. Jan 25, 2017 · I am now using React Jest to test code. . May 21, 2023 · If you are encountering the `SyntaxError: Unexpected token ‘export’` error while running Jest tests on your JavaScript files, it is likely because your JavaScript code is using a feature that is Jun 28, 2024 · Jest encountered an unexpected token. I'm using Jest to test my React app. Jest failed to parse a file. Choosing the Right Transformer You can use babel-jest or ts-jest as a transformer: Using babel-jest as the Transformer You should use babel-jest . I updated my jest. Now I want to test multiple components together, and I immedia Jun 11, 2020 · I believe your case is pretty much similar to these ones: amcharts4 issue #2133 - github OR Jest encountered an unexpected token. to Sep 16, 2022 · New NX projects with React are still running into this issue, the jest. , it's not plain JavaScript. 6. Nov 13, 2020 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Aug 25, 2019 · 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. Apr 15, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. npx nx migrate latest didn't create any migration file (so it said). However, despite following dozens of how-tos and tutorials, I am not able to fix the issue below. because it is a JS file with TS syntax, or it is published to npm as uncompiled source files. Jul 3, 2023 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. js file to include transformIgnorePatterns: Oct 3, 2021 · I am trying to test my react component with jest but when I try to run it, it's giving me this error: Jest encountered an unexpected token Jest failed to parse a file. My tests fail with this error: Test suite failed to run /my_project/node_modules/deck. Jest encountered an Jan 31, 2019 · I ran into a similar situation where I wanted to test a React component . By making it "^uuid$" this started working for me. Ask Question Asked 5 years, 11 months ago. Oct 24, 2024 · Jest 异常：Jest encountered an unexpected token; Jest 运行测试时发生 "Jest encountered an unexpected token" 的解决方法; Next. Jan 14, 2021 · Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. This is the test I'm running: import { render, screen } from '@testing-library/react' import { toBeInTheDocument } from '@testing-library/jest-dom' i May 25, 2022 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. Sep 29, 2024 · For those who have struggled with Jest configuration issues and the previous solutions did not resolve the problem, here’s a working solution: Update your jest. json to have "test": "react-scripts test" or replacing "jest" with "react-scripts test" under scripts just like this: package. js to . However, your answer fixed this for me. ts file and the quotes kept getting stripped off "uuid" and the fix didn’t work. While using old babel version everything worked fine, but because of some project problems we had to upgrade babel to 7 Sep 23, 2024 · I've encountered similar errors before, so here are my thoughts: That's good that you have the ResizeObserver mocked and it's in your setupFiles (that's often forgotten to add it there). Aug 29, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. test. Mar 13, 2023 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. Feb 11, 2019 · For those that travelled this far. This is the error: Jun 28, 2019 · Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. I was using Babel with Webpack. js has been altered during migration, but the the projects in the workspace have not had their jest. js"} SyntaxError: Unexpected token 'export' I have tried updating my jest. js project (using TypeScript), and I believe that I have encountered some configuration issues related to using firebase that are causing my Nov 30, 2022 · You signed in with another tab or window. The global jest. Feb 5, 2025 · I'm trying to run a test for a personal website done in create-react-app. Here's what you can do: Sep 15, 2024 · When running the Jest JavaScript testing framework in a React app, you may encounter an error such as the following: Jest failed to parse a file. exports = { env: { test: { presets: [ [ '@babel/preset-env', { modules: 'commonjs', debug: false } ], '@babel/preset-flow', '@babel/preset-react' ], plugins Mar 22, 2023 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. May 1, 2023 · Jest encountered an unexpected token Jest failed to parse a file. Marcus, a seasoned developer, brought a rich background in developing both B2B and consumer software for a diverse range of organizations, including hedge funds and web agencies. Sep 13, 2019 · In my case it was failing because I did not set properly the typescript support for Jest. Jest encountered an unexpected token when testing react-native with jest. Jan 13, 2025 · The issue that package change-case has only ESM version (lates version code) and Jest has only experimental ESM support feature. This should fix the issue when using @agm/core for an Angular 6 app is being used with jest. Aug 31, 2023 · When I try to run a test using MsalReactTester, I get the following error: Jest failed to parse a file. Jest is a popular JavaScript testing framework. Modified 5 years, 11 months ago. I managed to solve it by installing the below presets and having the babel configuration file as follows: Nov 4, 2021 · The issue started when updating Jest from 26. js:1 {export {defauls as arc} from ". Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Sep 15, 2024 · Sentry Answers > React > Jest encountered an unexpected token - SyntaxError: Unexpected token 'export' Jest encountered an unexpected token Jest failed to parse a Feb 14, 2022 · 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. config () Aug 10, 2023 · Test suite failed to run Jest encountered an unexpected token Jest failed to parse a file. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". js-react module but is throwing different import/export unexpected token errors during the t Jan 27, 2023 · I am trying to set up firebase authentication on my Next. This usually means that you are trying to import a file which Jest cannot parse, e. Sep 9, 2022 · node_modules\d3-shape\src\index. My final configs are: babel. Jun 29, 2022 · Jest test 'unexpected token export' 252 Jest gives an error: "SyntaxError: Unexpected token export" Jest encountered an unexpected token React. Mar 20, 2019 · Jest encountered an unexpected token React. ts file in all my apps to match your snippet, and it worked. Apr 22, 2019 · Sorry for unclear answer, I meant that, the line of code where Jest fails on, is part of react-navigation-tabs library, not my code; But where my code, needs and imports it, there is not any issues with jest, so, Jest does work in my files but fails on the sub-libraries (I can not just remove all my usages of external libraries, specially this one is required for the tabs of the application) Oct 7, 2018 · FAIL src/tests/ArticleService. This did not work, what did solve it in the end was adding the following to our jest. Asking for help, clarification, or responding to other answers.
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