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A common error in Jest testing when importing a file that Jest cannot parse, such as a non-JavaScript module. See possible solutions, examples and explanations from the Stack Overflow community.
14 de ene. de 2021 · Jest encountered an unexpected token. This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". Here's what you can do:
23 de feb. de 2021 · The author shares his solution for testing a modern JavaScript package with Jest, which involves using a standalone JS project with Babel and Jest configurations. He also criticizes the lack of documentation and consistency in Jest and Babel for this issue.
Learn what a Jest Unexpected Token Error is, how to identify it, and how to fix it. See common causes, examples and troubleshooting tips for this JavaScript testing framework error.
SyntaxError: Unexpected token {. Jest Config. transform: {. "^.+\\.ts$": "ts-jest", Test file. let request; beforeEach(() => {. request = supertest(app); });
27 de jun. de 2023 · In this blog post, we will explore how to leverage transformIgnorePatterns effectively, providing a final fix for unexpected token errors and ensuring smooth testing experiences.
6 de sept. de 2020 · The problem is most likely as we install a 3rd party package which is untranspiled. By default Jest will skip to transform any packages in the node_modules. Here are a few ways I have seen, assume the package is being used @fullcalendar: Use a customized package react app customize-cra:
