Syntaxerror Unexpected Token Export Jest Issue, This can be an issue if an ES Module-only package .

Syntaxerror Unexpected Token Export Jest Issue, This may cause your packager/runner to throw: Copy code Apr 16, 2025 · This issue has been automatically locked since it was closed and has not had any activity for 7 days. json of uuid, but that file is interpreted as CommonJS despite containing ESM code. You are pissed because a patch release broke your tests. Possible Cause Looking at the Sep 20, 2025 · A bunch of things are broken in Jest, within and outside MSW. Includes causes of the error, how to identify the problem, and the fix. Using a test-specific TypeScript config with module Dec 27, 2025 · The SyntaxError: Unexpected token export when using DeckGL with Jest is caused by a mismatch between DeckGL’s ES6 modules and Jest’s default CommonJS expectations. ']. Jan 16, 2026 · Run your tests: If the test passes without SyntaxError, the fix works! Conclusion The SyntaxError: Unexpected token 'export' with uuid in Jest is caused by misconfigured transpilation of ESM dependencies. Sep 15, 2024 · Note Jest does not support ES Modules; it uses CommonJS modules. However, a common roadblock many developers face is the SyntaxError: Unexpected token 'export' when running tests. Aug 2, 2022 · 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. config. If anything, use this as an opportunity to motivate Jest to ship support for the standard language format that's been out and supported everywhere for years already. SyntaxError: Unexpected token 'export' Jest Learn how to fix the SyntaxError: Unexpected token 'export' Jest error with this step-by-step guide. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant. 3 Steps to reproduce Full PR with the failing build is here OctoLinker/OctoLinker#1563 Expected behavior Prior to v28 this project built just fine, but now we're getting SyntaxError: Unexpected token 'export' errors from the jsonpath-plus package. Jan 16, 2026 · How to Fix 'SyntaxError: Unexpected token export' in Jest Setup When Importing node_modules (e. The most reliable fixes are: Adjusting transformIgnorePatterns to transpile uuid. browser. 1 akamai/AkamaiOPEN-edgegrid-node#283 broofa mentioned this on Dec 10, 2025 fix: support older node resolvers #917 SyntaxError: Unexpected token 'export' The DLS is exported as an ECMAScript module, meaning the import and export keywords are preserved. Jest gives an error: "SyntaxError: Unexpected token export" Asked 8 years, 1 month ago Modified 6 months ago Viewed 294k times Apr 5, 2026 · How to Fix Jest SyntaxError: Unexpected Token 'export' in React TypeScript Tests If you’re working with React and TypeScript, you’ve likely integrated Jest for testing. All my tests were running fine until I installed Puppeteer which req The problem seems to be that Jest resolves the main file by using the exports['. As far as I can tell that package has the correct exports for use with jsdom like we Sep 16, 2022 · New NX projects with React are still running into this issue, the jest. To fix this issue, you need to check what the server is sending back and make sure it's returning a JSON object. I am pissed because I spent months battling Jest and JSDOM. The example from Sushruth resolves the issue. mjs rules in place, Jest cannot process . 0. . 18. Jest uses Babel to compile JavaScript ES Modules to CommonJS, using the @babel/plugin-transform-modules-commonjs Babel plugin. 13. Actual Behavior Jest fails to parse . By default, Babel excludes Node modules from transformation. Feb 10, 2024 · Problem When trying to run a Jest test, you encounter the following error related to the uuid package: Jest encountered an unexpected token Jest failed to parse a file. This can be an issue if an ES Module-only package Jul 3, 2023 · Jest tests are failing because of an unknown unexpected token "export" Asked 2 years, 10 months ago Modified 10 months ago Viewed 11k times Jun 2, 2025 · Even with proper transformIgnorePatterns and . May 7, 2025 · Collaborator Another potential "fix" would be replacing jest-environment-jsdom with jest-fixed-jsdom, a wrapper that removes the problematic export conditions and preserves Node globals - published by the MSW team as they were affected by the same issues. mjs entrypoints in node_modules unless running in full ESM mode. , 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. mjs files due to native ESM imports, despite @angular/common working in 19. May 3, 2022 · Version 28. import property in the package. Expected Behavior Patch upgrades in Angular 19. x should not change module system behavior. Feb 3, 2023 · This is why you're getting the "Unexpected token '<'" error, because the HTML is not valid JSON. ES Modules use the export syntax to export a module, while CommonJS uses the exports object. 2. 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. Jun 20, 2025 · [BUG] broken imports JEST notejs / typescript - SyntaxError: Unexpected token 'export' #903 asilgag mentioned this on Oct 13, 2025 DXE-5755 issue with import using node v20. g. xmrm0a 5inm45i 9zgxnfy fty 8vqr pt0ph8q nyifmp 6chx1goo dguxj rtp