Jest Unexpected Token Import Typescript, 3. Jan 27, 2023 · I am trying to set up firebase authentication on my Next. ”\n- Unexpected token often means: “I saw punctuation or a keyword in an illegal place. I ran tests, and they failed. css’ 這是因為 jest. FAIL src Jun 28, 2019 · I'm want to test a component in a React app using Jest Enzyme with TypeScript. \n\n### Unexpected identifier vs Unexpected token \n- Unexpected identifier usually means: “I saw a name where a separator/operator/delimiter should be. Because the uuidlibrary I upgraded now did not pre-compile its ES m Jan 3, 2026 · The "Unexpected Token" error in Jest is a common roadblock caused by untranspiled modules in node_modules. Dec 28, 2022 · Jest encountered an unexpected token Jest failed to parse a file. Aug 13, 2025 · When you run npm test, Jest transforms ts files, handles imports, and runs tests without “cannot use import statement outside a module jest” or “unexpected token jest failed”. spec. js:1. May 5, 2025 · When running unit tests using Jest, get the error as below. When I run jest, I get the following error: Jest encountered an unexpected token This usually means that you are trying to import a file wh Jun 27, 2023 · Introduction: Jest, a powerful testing framework for JavaScript and TypeScript projects, occasionally encounters unexpected token errors while parsing files. 8 it is impossible to run tests due to the parsing error: FAIL src/test. Jan 14, 2025 · Jest encountered an unexpected token Jest failed to parse a file. This usually means that you are trying to import a file which Jest cannot parse, e. Here's what you can do: Aug 2, 2022 · 80 I used to solve similar errors while I was using Jest with only JavaScript, but currently I'm not able to do so with Typescript. Feb 23, 2021 · Depending upon your setup, you might see the error on the first line of the code file or you might see it when the code tries to process JSX. Here was the error: There are several tips on what might be wrong and recommendations on how to resolve it. This happens e. I saw it on line 1, because line 1 is almost always occupied by an import statement - and there are no import statements in CommonJS. json when using create-react-app. js 中，未定義 CSS module May 5, 2025 · Jest encountered an unexpected token Jest failed to parse a file. 1 Steps to reproduce We use Typescript, if our test file (*. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. When I ran tests I started to get the following error ` Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot Nov 22, 2021 · Jest encountered an unexpected token Jest failed to parse a file. Feb 24, 2020 · 🐛 Bug Report When using a new "type-only impors/exports" feature introduced in TypeScript 3. ”\n\nIn practice, you debug them similarly (punctuation Nov 23, 2022 · Jest encountered an unexpected token Jest failed to parse a file. Make sure that you explicitly add the default babel-jest transformer in your babel. Oct 19, 2025 · This error can be frustrating, especially for those new to TypeScript and Jest. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". g. When trying to run yarn jest, I get the following error: I have tried removing all package 3 days ago · Here are quick differentiators I use. I ran into this recently when upgrading some libraries, including uuid, specifically. ts) contains the following import import { scaleLinear } from 'd3'; Expected behavior Test runs without problems Actual Jul 16, 2020 · It then causes tests to fail with this. Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. These errors can occur due to Oct 30, 2019 · I have a React application (not using Create React App) built using TypeScript, Jest, Webpack, and Babel. I tried to add transformIgnorePatterns and moduleNameMapper to my … May 10, 2023 · Jest encountered an unexpected token Jest failed to parse a file. js project (using TypeScript), and I believe that I have encountered some configuration issues related to using firebase that are causing my Dec 31, 2021 · Hi all, I'm trying run jest using ts-jest, but I'm running into the following error: Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot p Feb 11, 2019 · For anyone hitting this question in fall 2020 or later, for an error like SyntaxError: Invalid or unexpected token when Jest parses CSS files: True, the error is due to Jest trying to parse the CSS as JavaScript, which wont work. Feb 13, 2024 · Detail: I have updated a third party library axios version to 1. it's not plain JavaScript. I have issues with Jest picking up an internal library, Jest would display 'unexpected token' errors wherever I had my imports from this library. Jun 27, 2023 · Introduction: Jest, a powerful testing framework for JavaScript and TypeScript projects, occasionally encounters unexpected token errors while parsing files. . Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. 6. By adjusting transformIgnorePatterns with a negative lookahead regex, you can tell Jest to transform specific modules, resolving the error. I suspect it’s because of typescript as I use es6 modules everywhere in my react project and that never stopped babel from transpiling it before. In this blog post, we will delve into the root causes of this error, explore different usage methods, common practices, and best practices to help you overcome this issue and write effective tests. I'm using nextJs and typescript with styled-components. The error is big, but it's pretty helpful and descriptive. ts Test suite failed to run Jest encountered an unexpected token This u Jul 2, 2018 · Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. May 29, 2022 · 如需建立Jest環境可由Next 官方網站，或由此連結直接安裝Github範例。 import styles from ‘@/pages/index. Jan 5, 2019 · Issue : I am using ts-jest to test my typescript library. I follow the instructions on the Jest site, but for some reason I get: SyntaxError: Unexpected token < I can test Jan 14, 2021 · Jest encountered an unexpected token when working with React TypeScript Asked 5 years ago Modified 5 years ago Viewed 37k times Nov 4, 2021 · Version 27. These errors can occur due to non Sep 15, 2024 · If your project uses TypeScript, Jest transforms your TypeScript files to JavaScript using the babel-jest transformer. config. Jest encountered an unexpected token: Learn how to fix this common JavaScript error with step-by-step instructions and code examples. 7 . Jest encountered an unexpected token. js file if you use additional code preprocessors: Jan 31, 2023 · I configured all my jest with babael, but I can't run the tests, it always shows the same error. All my tests were running fine until I installed Puppeteer which requires @types/jest-environment-puppeteer, @types/puppeteer and @types/expect-puppeteer. This guide will help you get Nov 9, 2022 · When I run my tests using Jest, I got an SyntaxError: Unexpected token ‘export’ from node_modules/@sendbird/chat/sendbird. 15 For anyone using create-react-app, only certain jest configurations can be changed in package. module. Jest failed to parse a file. ggoge, jk8g7, gx9qtk, qetml, us9h, zsmbl, q04fjq, d3vu, hwj2, s0kw,