Ts Jest Unexpected Token Export. 1 Steps to reproduce We use Typescript, if our test file (*. 1.

1 Steps to reproduce We use Typescript, if our test file (*. 1. Issue : First of all, I'm not sure if this is a ts-jest issue or not, so sorry if I'm not reporting this in the proper place. Aug 23, 2022 · Jest encountered an unexpected token Jest failed to parse a file. The code contains dependencies with ES2015 module imports and exports and when built its bundled with webpack where the target code still contain ES2015 module exports and imports Aug 9, 2023 · -1 Jest encountered an unexpected token. Feb 13, 2024 · Detail: I have updated a third party library axios version to 1. I follow the instructions on the Jest site, but for some reason I get: SyntaxError: Unexpected token &lt; I can test Sep 6, 2022 · Jest encountered an unexpected token Jest failed to parse a file. Mar 9, 2023 · まとめ Jest v28 へのアップデートで Jest encountered an unexpected token エラーが発生した場合は package. After updating the node to v20 and triggering Jest tests for certain app Im getting the following error - SyntaxError: Unexpected token ' Sep 13, 2023 · Jest encountered an unexpected token Jest failed to parse a file. A jest. How do you fix the Jest SyntaxError: Unexpected Token 'export' error? To fix the Jest SyntaxError: Unexpected Token 'export' error, you need to make sure that you are using the export keyword correctly. Apr 22, 2022 · Jest SyntaxError: Unexpected token 'export' #3443 Open david-wb opened on Apr 21, 2022 Apr 22, 2019 · > jest FAIL __tests__/App-test. config. This error can be frustrating, especially for those new to TypeScript and Jest. Includes causes of the error, how to identify the problem, and the fix. Jun 3, 2019 · Hello! I get SyntaxError: Unexpected token export when trying to running my test. Mar 11, 2019 · Hej, I am trying to set up jest with some library. 9 is the latest, but consider at least moving to 3. Jan 22, 2022 · Jest encountered an unexpected token - SyntaxError: Unexpected token 'export' Asked 3 years, 11 months ago Modified 2 years, 10 months ago Viewed 55k times 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. /DemoContainer'; Test suite failed to run Oct 12, 2018 · Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. JSでFullcalendarを使用していて、jestで単体テストを書いている中で 「SyntaxError: Unexpected token 'export'」というエラーが発生したのでその解消時の内容を備忘として残しておく。 事前準備 その前にjestの設定としてやったことも残しておく。 参考 Feb 20, 2024 · Jest encountered an unexpected token Jest failed to parse a file. Jun 24, 2022 · メモ「Jest + TypeScriptで`SyntaxError: Unexpected token 'export'`が出る | Public Theta Blog」のページです。 Sep 17, 2021 · Jest Unexpected token 'export' when using d3 Asked 4 years, 4 months ago Modified 1 year, 5 months ago Viewed 9k times Oct 14, 2024 · Im working on a NestJS project which used to run on node v16. This is because Jest cannot parse the dependency’s public API file, which includes an export statement. This guide will help you get During the execution of unit tests, Jest, a popular testing framework, throws a SyntaxError: Unexpected Token ‘export’. js, and the last one was close but I was still missing one important thing the imports. *\\. Jan 13, 2025 · SyntaxError: Unexpected token 'export' in Jest Asked 10 months ago Modified 10 months ago Viewed 214 times Jan 26, 2023 · Jest setup with TS; Unexpected token 'export' Asked 2 years, 2 months ago Modified 2 years, 2 months ago Viewed 129 times 2. createScriptFromCode (. ":function (module,exports,require,__dirname,__filename,jest) {export { DemoContainer, DemoItem } from '. However, despite following dozens of how-tos and tutorials, I am not able to fix the issue below. 项目中引入第三方库报错，测试时Jest报错，export default portalCommunication; ^^^^^^ SyntaxError: Unexpected token export > 1 报错原因是node_modules下的文件默认是不会被transform的 (默认配置)，所以es6的写法报错了。 2. (. ts) contains the following import import { scaleLinear } from 'd3'; Expected behavior Test runs without problems Actual Dec 20, 2025 · How to Fix 'SyntaxError: Unexpected token export' in Jest Setup When Importing node_modules (e. Nov 9, 2023 · CRA & Jest 这个是我的项目的问题，运行 Jest 后报错说 "SyntaxError: Unexpected token export"，最后是用在 StackOverflow 第二个解决方案成功的，修改方法为在 package. min. ts and index. Mar 21, 2022 · I get this error: C:\\Users\\myname\\Projects\\ConfigEditor\\MesConfiguration. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. But when I try to test the library I am keep getting the SyntaxError: Unexpected token export error. , `export`) in D3 or its dependencies. js is now generated (before I just had Jest configuration in my package. it works fine as long as I have javascript files but I do work with some packages containing typescript code. Jest unexpected token 'export': How to fix Jest is a popular JavaScript testing framework. The threads span a number of years - meaning that the issue keeps cropping up for people repeatedly. 2. Dec 13, 2024 · In summary, I tried setting transformIgnorePatterns, switching from ts-jest to babel or esbuild-jest, using "ts-jest/presets/js-with-ts", ensuring useESM: true, using extensionsToTreatAsEsm, and many more. This error can occur for a variety of reasons, but it is usually caused by a syntax error in your code. test script "scripts": { "test": "jest --cov Sep 7, 2025 · 6. You likely want a newer TS as well - I believe 3. Jul 31, 2017 · However, I am seeing jest tests choke when using such imports with SyntaxError: Unexpected token export errors. Dec 4, 2023 · The primary error seems to be SyntaxError: Unexpected token 'export' but I can’t figure out why temporal is having trouble building my typescript code (which does, in fact, use export). json desn't provide a "main" field, maybe that's the case), so you have to explicitly tell jest to transpile it with babel transform Mar 21, 2022 · I get this error: C:\\Users\\myname\\Projects\\ConfigEditor\\MesConfiguration. ts$': 'ts-jest', '. 0. Jul 23, 2024 · Describe the bug possible related issue: #87 I know that the new version of export-to-csv has some breaking change which exports ES modules instead of CommonJS now? But that caused our Jest to fail Dec 24, 2023 · <h2>Why Does This Happen?</h2> <p> When running Jest tests with <code>tsx</code> (or <code>jsx</code>) React components, you might encounter the "<code>SyntaxError Oct 14, 2024 · はじめに JISOU で Vite + Rreact の環境に Jest でテストを書こう！という課題がありました。設定は難しいため、設定ファイルは課題の中に記載がありました。物好きなわたしは Jest の本家サイトからインストール手順を追いかけてみて、見事にエラーに出く Jan 31, 2023 · Jest encountered an unexpected token Jest failed to parse a file. Aug 2, 2022 · JEST - SyntaxError: Unexpected token 'export' with uuid library Asked 3 years, 5 months ago Modified 2 months ago Viewed 63k times Sep 12, 2025 · With these changes, Jest will correctly transform the jose package, and the Unexpected token 'export' error will no longer occur. SyntaxError: Unexpected token 'export' Jest Learn how to fix the SyntaxError: Unexpected token 'export' Jest error with this step-by-step guide. 9 I've seen some other answers and GitHub issues that describe this, but I haven't been able to find a solution in my case. After updating the node to v20 and triggering Jest tests for certain app Im getting the following error - SyntaxError: Unexpected token ' This document covers known issues and common problems encountered when migrating from Material UI v4 to v5. json の exports サポートが影響している可能性があります。 その場合は customExportConditions による調整で通るようになる場合があります。 Jan 23, 2024 · Jest encountered an unexpected token Jest failed to parse a file. Here's what you can do: Sep 9, 2022 · Issue with jest "Unexpected token 'export'" Asked 3 years, 2 months ago Modified 3 years, 1 month ago Viewed 1k times Feb 3, 2022 · SyntaxError: Unexpected token 'export' at Runtime. When I build project B, there is no such issues with the export. Jan 14, 2025 · Jest encountered an unexpected token Jest failed to parse a file. Jan 10, 2017 · Not the same but it looks like the reason is the same – code from react-icons doesn't get transpiled (its package. g. 7 . it's not plain JavaScript. json の exports サポートが影響している可能性があります。 その場合は customExportConditions による調整で通るようになる場合があります。 May 25, 2022 · Jest encountered an unexpected token Jest failed to parse a file. Error Jest doesn't support ES6 module and hence throwing this error when you directly run the test with Jest > ### Why does Jest not support 'import Mar 9, 2023 · まとめ Jest v28 へのアップデートで Jest encountered an unexpected token エラーが発生した場合は package. In this case, lodash-es specifically exports es modules, so you HAVE to let jest transform that code. Jest Unexpected Token Export: What It Is and How to Fix It Jest unexpected token export is a common error that occurs when you're trying to export a function, class, or other module from your test file. spec. js project (using TypeScript), and I believe that I have encountered some configuration issues related to using firebase that are causing my Dec 25, 2025 · If you’re working on a TypeScript project using Jest for testing, you might have encountered a frustrating error after installing Puppeteer types (`@types/puppeteer`): `SyntaxError: Unexpected token 'export'`, with the stack trace pointing to the `uuid` library. /node_modules/ng2-charts/fesm2015/ng2-charts. So far I only have a little experience with running unit tests on frontend components, but since my project only required the logic the tests seem to require a little different setup. However, you may encounter the error unexpected token 'export' when using Jest. If you don't like use the latest version, try Jest 25. Sep 15, 2024 · ES Modules use the export syntax to export a module, while CommonJS uses the exports object. Finally, you want vue-jest 4. 5 test E:\projects\github\wtto00\android-tools > jest --detectOpenHandles --verbose Error: Jest: Failed to parse the TypeScript config file E:\projects\github\wtto00\android-tools\jest. Oct 19, 2025 · When working with TypeScript projects and using Jest as the testing framework, developers often encounter the SyntaxError: Unexpected token 'export' error. Jest encountered an unexpected token Jest failed to parse a file. Dec 20, 2025 · A common roadblock is the `SyntaxError: Unexpected token 'export'` error, which occurs when Jest encounters ES6 module syntax (e. I worked around this by adding these modules to the transformIgnorePatters in my Jest config, but this doesn't seem like the way to go. js:24 export function __extends(d, b Oct 17, 2017 · Jest: SVG require causes "SyntaxError: Unexpected token <" Asked 8 years, 2 months ago Modified 2 years, 5 months ago Viewed 40k times Jul 23, 2024 · Describe the bug possible related issue: #87 I know that the new version of export-to-csv has some breaking change which exports ES modules instead of CommonJS now? But that caused our Jest to fail Aug 10, 2022 · Inside both of otp and registration folders, there is a hooks. Feb 23, 2021 · The Headache If you Google "jest unexpected token", there are several signs that this is a really nasty issue: There are a great many threads on the issue - on Stack Overflow and otherwise. tsx ? 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. Jun 28, 2019 · I'm want to test a component in a React app using Jest Enzyme with TypeScript. Here's what you can do: Aug 10, 2020 · For example, I think you can move to Jest 26 (came out a few months ago) and the corresponding ts-jest. Jun 18, 2022 · This article documents the unit test execution exceptions and solutions after upgrading jest 28. 6. I'm getting the dreaded SyntaxError: Unexpected token export when trying to run jest. Jun 30, 2023 · Jest encountered an unexpected token Jest failed to parse a file. Despite multiple attempts and tutorials, the issue persists. mjs:5:23) Answers related to “jest lodash-es SyntaxError: Unexpected token export” · parsing error unexpected token javascript · popper. js:24 export function __extends(d, b Jul 29, 2020 · I'm getting SyntaxError: Unexpected token 'export' on some node_modules, which are not transpiled (I guess?). exports = { transform: { '^. (vue)$': '@vue/vue3-jest', }, }; It's working to me now. Oct 14, 2024 · はじめに JISOU で Vite + Rreact の環境に Jest でテストを書こう！という課題がありました。設定は難しいため、設定ファイルは課題の中に記載がありました。物好きなわたしは Jest の本家サイトからインストール手順を追いかけてみて、見事にエラーに出く A lot of node modules export ES5 so that jest can run it out of the box without transform. 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. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". , lodash-es) If you’ve worked with Jest for testing JavaScript/TypeScript applications, you may have encountered the frustrating SyntaxError: Unexpected token export when importing certain node_modules —especially ES Modules (ESM) like lodash-es. - React and Typscript with Jest and React-testing-Library E:\Git\node_modules@mui\x-date-pickers\internals\demo\index. x most likely. まとめ 本記事では、Jest 実行時に発生する 「Unexpected token ‘export’」エラー の原因と解決策を解説しました。 Jest はデフォルトで CommonJS 前提のため、ESM をそのまま解釈できない babel-jest を導入して transform 設定を追加するのが基本的な対処法 Dec 4, 2019 · And then in project B's index. Jest uses Babel to compile JavaScript ES Modules to CommonJS, using the @babel/plugin-transform-modules-commonjs Babel plugin. json 中添加 --transformIgnorePatterns 这个 flag： Jest encountered an unexpected token Jest failed to parse a file. Make sure that you are using the export keyword in the correct place. Jan 26, 2023 · Jest setup with TS; Unexpected token 'export' Asked 2 years, 2 months ago Modified 2 years, 2 months ago Viewed 129 times Jul 3, 2023 · Jest tests are failing because of an unknown unexpected token "export" Asked 2 years, 6 months ago Modified 7 months ago Viewed 11k times Oct 19, 2020 · Error: Jest: Failed to parse the TypeScript config file /Users/rafael/dev/maintained/detect-it/jest. ts SyntaxError: Unexpected token 'export' Oct 23, 2023 · Have you configured jest together with react-testing-library and now gotten Jest SyntaxError: Unexpected token 'export' when building? I tried multiple things, like modifying . babelrc and some dependencies, moduleNameMapper and transformIgnorePatterns in jest. /node_modules/jest-runtime/build/index. Many of the threads are long. Oct 31, 2024 · When working with Typescript and Jest for testing your code, you may encounter the error "SyntaxError: Unexpected token 'export'" in your test files. Jul 29, 2020 · I'm getting SyntaxError: Unexpected token 'export' on some node_modules, which are not transpiled (I guess?). Nov 23, 2022 · Jest encountered an unexpected token Jest failed to parse a file. js:1728:14) at Object. Initial Diagnosis: Have You Tested These Measures? Sep 6, 2020 · Here is one of the most popular question which is related to testing with jest for repo setup with cr Tagged with jest, testing, react, javascript. json). This happens e. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. This error occurs because Jest doesn't natively support ES modules in Typescript files. . Seems like he Jest encountered an unexpected token: Learn how to fix this common JavaScript error with step-by-step instructions and code examples. ts file. Jest gives an error: "SyntaxError: Unexpected token export" Asked 7 years, 10 months ago Modified 2 months ago Viewed 292k times Nov 4, 2021 · Version 27. 1) jestjs/jest#12036 (comment) and it worked immediately. 3. Jul 5, 2022 · SyntaxError: Unexpected token 'export' が発生した場合 こちらの記事 によると、ts-jestはESModuleに対応していないとのこと。 そして、導入したライブラリの中にESModuleで提供されているパッケージがあると、そのままではJest上でimportできないようです。 Nov 8, 2018 · In all my projects I use jest for testing. that's why by default jest doesn't transform node_modules. Jan 22, 2022 · Jest encountered an unexpected token Jest failed to parse a file. Nov 19, 2021 · module. In the error message under details you can see the reporting module, for me it looked like this: Mar 2, 2022 · 4. In the error message under details you can see the reporting module, for me it looked like this: Dec 13, 2024 · In summary, I tried setting transformIgnorePatterns, switching from ts-jest to babel or esbuild-jest, using "ts-jest/presets/js-with-ts", ensuring useESM: true, using extensionsToTreatAsEsm, and many more. Weirdly this may be somehow related to using enums? Oct 14, 2024 · Im working on a NestJS project which used to run on node v16. An alternative approach is to use the jest-esm-transformer package instead of ts-jest. Jul 10, 2022 · Solution I tested this solution locally: [Bug]: Unexpected token 'export' when Jest test imports d3 (7. Jul 14, 2023 · Jest encountered an unexpected token Jest failed to parse a file. Here are the steps: 1. ts SyntaxError: Unexpected token 'export' Nov 21, 2024 · 経緯 Next. ts, I export all the definitions (export * from blah) for use by the client as shown at the top of this post. ts: createApi from redux-toolkit is being used to create some api calls. 5+ (stable for over a year). Hi, I built a small CLI and set up Jest for my project. js:1 ( {"Object. Jan 27, 2023 · I am trying to set up firebase authentication on my Next. es6. Inside hooks. When I ran tests I started to get the following error ` Jest encountered an unexpected token Nov 22, 2023 · Learn how to unit test Expo apps using Jest and React Native Testing Library, with solutions for mocking AsyncStorage, Redux, and React Navigation. +\\. /. I tried every option with similar issues, but I can't get it to work. Currently, I'm migrating a react project Typescript but to do it as fas Dec 23, 2020 · but Jest doesn't like it and throws a SyntaxError: Unexpected token 'export' I tried different things, like play around with . WebClient\\node_modules\\tslib\\tslib. js. · jest invalid or unexpected Sep 18, 2024 · > @wtto00/android-tools@1.

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