Syntaxerror unexpected token export jest react. js Understanding Syntax Error: Unexpected Token in Next. Dec 20, 2025 · In this blog, we’ll demystify why this error happens, explore common causes, and walk through actionable solutions to resolve it. Because vitest does not export the Jest globals (like describe), you can either set globals: true, or manually import the required keywords in your test. In this guide, we’ll break down why this error occurs and walk through step-by-step solutions to resolve it, ensuring your Jest tests run smoothly with DeckGL. SyntaxError: Unexpected token 'export' Jest Learn how to fix the SyntaxError: Unexpected token 'export' Jest error with this step-by-step guide. The threads span a number of years - meaning that the issue keeps cropping up for people repeatedly. Nov 4, 2021 · SyntaxError: Unexpected token 'export' The issue started when updating Jest from 26. Many of the threads are long. If your project uses TypeScript, Jest transforms your TypeScript files to JavaScript using the babel-jest transformer. Perhaps it was slower as you mention, but at least the tests worked. 1. js:1. Feb 23, 2021 · Some of the people posting their approaches seem quite knowledgeable on all aspects of configuration for Jest / React / Babel / TypeScript / etc. A lot of node modules export ES5 so that jest can run it out of the box without transform. 3 project with typescript. com Jest SyntaxError: Unexpected token 'export' on Apr 21, 2022 Testing Bryntum Grid with Jest Jest is an extensive JavaScript testing library that seamlessly integrates with frameworks like Node. spec. 3. This time I'm going to talk about a specific error: SyntaxError: Unexpected token 'export'. js is a React framework that enhances application performance through features like server-side rendering and static site generation. g. The threads are filled with one person posting something like, "Here's how I fixed it. Jest uses Babel to compile JavaScript ES Modules to CommonJS, using the @babel/plugin-transform-modules-commonjs Babel plugin. It takes modern JavaScript into account, which allows for newer syntax and features. By default, Jest will not transform anything. json. 👍 React with 👍 67 david-wb changed the title Jest SyntaxError: Unexpected token 'export' site:stackoverflow. While Bryntum components ship with the Siesta testing tool, you may wish to extend your existing Jest testing setup to cover the Bryntum components in your Version 27. " What is Syntax error: Unexpected token in Next. Includes causes of the error, how to identify the problem, and the fix. In this case, lodash-es specifically exports es modules, so you HAVE to let jest transform that code. I finally found a workaround for this. When I try running tests for any component that uses react-markdown I get some issues here Jest encountered an unexpected token Jest failed to parse a file. This can be an issue if an ES Module-only package, such as react-markdown, is not pre-transpiled. I tried to add transformIgnorePatterns and moduleNameMapper to my … 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. Oct 23, 2023 · If you're seeing this error due to a third-party package that's using ES modules, you may need to tell Jest to transform that package. js, React, and Angular, with minimal configurations, making it a popular choice with JavaScript developers. There doesn't seem to be any one universal answer. Sep 15, 2024 · By default, Babel excludes Node modules from transformation. 3 to 27. that's why by default jest doesn't transform node_modules. Dec 27, 2025 · Jest, on the other hand,传统上 uses CommonJS (CJS) modules and ignores `node_modules` when transpiling code, leading to a mismatch. I can assure you that I was receiving the error "Jest gives an error: "SyntaxError: Unexpected token export"" and the above change worked to remove this error. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such When I run my tests using Jest, I got an SyntaxError: Unexpected token ‘export’ from node_modules/@sendbird/chat/sendbird. js Next. ts) contains the following import import { scaleLinear } from 'd3'; Expected behavior Test runs without problems Actual Hi redwood community! I am trying to use react-markdown in a new redwood 4. . Whether you’re using lodash-es, vue-esm, or another ESM package, this guide will help you get your tests running smoothly. # Hi developers, Please am try to build Search-optimized SPAs with React Helmet, I fellow this website But if instead of copying the contents I just have the export default from '@react-native-community/async-storage/jest/async-storage-mock' line from the instructions, I get errors pointing to KeysType again. For a basic project, that's all that's needed. ES Modules use the export syntax to export a module, while CommonJS uses the exports object. 1 Steps to reproduce We use Typescript, if our test file (*. This happens e. 6. Olek Posted on Dec 23, 2020 Jest SyntaxError: Unexpected token 'export' # jest # react # testing # rtl In this post, I'm not going to explain how to configure react-testing-library and Jest, there is a lot of useful information about it. I first found this Jest issue #2550 it mentioned setting up transformIgnorePatterns and adding "allowJs": true to our tsconfig. snnip, ieowdo, anczl, 6y4qm, b7ayv, acog, bwfaoi, xs8h5, v3ef1r, q75c,