Jest encountered an unexpected token Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. By default "node_modules" folder is ignored by transformers. Here's what you can do: • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it. • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config. • If you need a custom transformation specify a "transform" option in your config. • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option. You'll find more details and examples of these config options in the docs: https://jestjs.io/docs/configuration For information about custom transformations, see: https://jestjs.io/docs/code-transformation Details: <project>/tests/setupTests.ts:1 ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,jest){import '@testing-library/jest-dom'; ^^^^^^ SyntaxError: Cannot use import statement outside a module at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1517:14)

My setupTests.ts contains one line: import '@testing-library/jest-dom'; .

How can I fix this?

It seems to be related to how your build system is configured. Can you try putting this instead:

Or checkout out that link about enabling ES modules in jest? This is most likely not an issue with jest-dom. We do not control how your build process works.