Jest syntaxerror unexpected token export typescript. Nov 23, 2022 · Jest failed to parse a file. However, you may encounter the error unexpected token 'export' when using Jest. Aug 2, 2022 · JEST - SyntaxError: Unexpected token 'export' with uuid library Asked 3 years, 7 months ago Modified 5 months ago Viewed 63k times Sep 15, 2024 · ES Modules use the export syntax to export a module, while CommonJS uses the exports object. 3. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. This can happen for a number of reasons, but the most common cause is when you forget to use the `export` keyword. 1. 3 to 27. 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). when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. Jest uses Babel to compile JavaScript ES Modules to CommonJS, using the @babel/plugin-transform-modules-commonjs Babel plugin. 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. I created an NPM package that uses modern JavaScript. Hopefully this will save others from wasting their time getting Jest to work with Typescript. Jul 29, 2020 · I'm getting SyntaxError: Unexpected token 'export' on some node_modules, which are not transpiled (I guess?). . Jan 22, 2022 · Jest encountered an unexpected token Jest failed to parse a file. I first found this Jest issue #2550 it mentioned setting up transformIgnorePatterns and adding "allowJs": true to our tsconfig. Oct 19, 2025 · The SyntaxError: Unexpected Token 'export' error in Jest TypeScript projects can be a common roadblock, but by understanding the root causes and following the usage methods, common practices, and best practices outlined in this blog post, you can effectively resolve this issue. Jest gives an error: "SyntaxError: Unexpected token export"I'm using Jest to test my React app. Q: How can I fix the syntax error “unexpected token ‘export'” in Jest? A: To fix the syntax error “unexpected token ‘export'” in Jest, you will need to make sure that the variable or function that you are trying to export is declared in the current scope. I'm getting the dreaded SyntaxError: Unexpected token export when trying to run jest. g. Jest setup "SyntaxError: Unexpected token export" Asked 9 years, 1 month ago Modified 2 years, 4 months ago Viewed 96k times Jun 27, 2023 · Introduction: Jest, a powerful testing framework for JavaScript and TypeScript projects, occasionally encounters unexpected token errors while parsing files. Aug 10, 2022 · JEST - SyntaxError: Unexpected token 'export' Asked 3 years, 6 months ago Modified 3 years, 6 months ago Viewed 1k times Jun 30, 2023 · Jest encountered an unexpected token Jest failed to parse a file. Oct 31, 2024 · This error occurs because Jest doesn't natively support ES modules in Typescript files. 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. Recently, I added DeckGL to This article was a huge help: Getting Started on Testing with Typescript, ReactJS, and Webpack. For a basic project, that's all that's needed. The Jest SyntaxError: Unexpected Token ‘export’ is caused when you try to export a module in a way that doesn’t conform to Jest’s expectations. This happens e. 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. To resolve this issue, you can use Babel to transpile your Typescript code to CommonJS format before running Jest tests. json. 6. I finally found a workaround for this. This error can occur for a variety of reasons, but it is usually caused by a syntax error in your code. Jest unexpected token 'export': How to fix Jest is a popular JavaScript testing framework. I refuse to write my packages with old-skool require() and module. export and all those other aging conven Nov 4, 2021 · SyntaxError: Unexpected token 'export' The issue started when updating Jest from 26. asfohrq odurx raokv zrop keomo uiz hzfjyv uaojzl tuvc omam