Jest Encountered An Unexpected Token, This usually means that you are trying to import a file which Jest cannot parse, e. Jest failed to parse a file. Jan 14, 2021 · Jest encountered an unexpected token when working with React TypeScript Ask Question Asked 5 years, 5 months ago Modified 5 years, 5 months ago Feb 13, 2024 · The key changes are: Using @swc/jest to compile both TypeScript and JavaScript files Overriding transformIgnorePatterns (by default, Jest ignores node_modules) and, this doesn't require the --experimental-vm-modules Node option Note: Removing the ignore pattern means all node_modules may be transformed, which can impact performance if you have many dependencies. I refuse to write my packages with old-skool require() and module. This happens e. This tells jest that it doesn't need to transform the node_modules packages because they are already packaged EXCEPT for your list, which are probably local packages that NEED to be transformed. The root cause was that we had a circular dependency in code. Jan 16, 2026 · The "Unexpected Token" error in Jest is a common roadblock caused by untranspiled modules in node_modules. just like in this post: "Jest encountered an unexpected token" Oct 31, 2024 · By following these troubleshooting steps and ensuring that your Jest and Typescript configurations are correctly set up, you can resolve unexpected token errors and run your tests smoothly. Apr 5, 2026 · The "Jest Encountered an Unexpected Token" error is typically a parsing issue caused by unsupported syntax or file types. it's not plain JavaScript. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". Aug 11, 2025 · Jest encountered an unexpected token. g. 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 Jest encountered an unexpected token: Learn how to fix this common JavaScript error with step-by-step instructions and code examples. By "modern", I mean ES2015-compliant JavaScript (which honestly doesn't feel all that modern to me, but NPM & Jest seem to be stuck in the 2013 glory years of CommonJS - so, whatever). I created an NPM package that uses modern JavaScript. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. export and all those other aging conven Jan 31, 2023 · Jest failed to parse a file. By default "node_modules" folder is ignored by transformers. Jul 2, 2018 · We had the same issue with another library. — September 15, 2024 jump to solution Jest encountered an unexpected token: SyntaxError: Unexpected Token { Ask Question Asked 7 years, 9 months ago Modified 5 years, 8 months ago Dec 29, 2025 · 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. May 5, 2025 · When running unit tests using Jest, get the error as below. Dec 29, 2022 · Jest encountered an unexpected token Ask Question Asked 3 years, 5 months ago Modified 3 years, 2 months ago Jan 5, 2019 · Issue : I am using ts-jest to test my typescript library. By configuring Babel for JavaScript/JSX/TypeScript, mocking non-JS files, or using custom transformers, you can resolve it. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. In my case, build time stays Sep 15, 2024 · Jest encountered an unexpected token - SyntaxError: Unexpected token 'export' Matthew C. But the error text did not refer to it at all. Jest encountered an unexpected token. 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 Dec 24, 2023 · This happens e. This guide will help you get Apr 22, 2019 · Jest fails with "Unexpected token *" on import statement Ask Question Asked 7 years, 2 months ago Modified 4 years, 6 months ago. By adjusting transformIgnorePatterns with a negative lookahead regex, you can tell Jest to transform specific modules, resolving the error.
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