Angular Jest Encountered An Unexpected Token, it's not plain JavaScript.

Angular Jest Encountered An Unexpected Token, By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". Nov 22, 2021 · Jest failed to parse a file. Jest encountered an unexpected token. Jan 27, 2025 · Jest encountered an unexpected token. By configuring Babel for JavaScript/JSX/TypeScript, mocking non-JS files, or using custom transformers, you can resolve it. Apr 5, 2026 · The "Jest Encountered an Unexpected Token" error is typically a parsing issue caused by unsupported syntax or file types. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. it's not plain JavaScript. Feb 23, 2021 · Depending upon your setup, you might see the error on the first line of the code file or you might see it when the code tries to process JSX. Here's what you can do: May 5, 2025 · When running unit tests using Jest, get the error as below. Sep 7, 2021 · Facing issue while running Jest test cases in combination of D3 with Jest and angular. Many of the threads are long. This usually means that you are trying to import a file which Jest cannot parse, e. Issue Why does Jest fail with "Unexpected token *" on a simple import statement??? Aug 11, 2025 · Jest encountered an unexpected token Jest failed to parse a file. The threads span a number of years - meaning that the issue keeps cropping up for people repeatedly. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. g. Regardless of the methods I used to place jest (listed below), I am getting error: Test suite failed to r. Jest failed to parse a file. Jan 31, 2023 · How to fix Jest encountered an unexpected token Ask Question Asked 3 years, 4 months ago Modified 3 years, 4 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. On Mac, I am having problem getting jest installed and working in an angular/cli (v6) app. Aug 17, 2020 · Jest encountered an unexpected token. Test suite failed to run Jest encountered an unexpected token This usually means that you are trying to impor Feb 23, 2021 · The Headache If you Google "jest unexpected token", there are several signs that this is a really nasty issue: There are a great many threads on the issue - on Stack Overflow and otherwise. I saw it on line 1, because line 1 is almost always occupied by an import statement - and there are no import statements in CommonJS. This happens e. Dec 29, 2025 · You now have a better understanding of the causes and solutions for the jest encountered an unexpected token error, and if you get puzzled by the same error in the future, come back to this article. ahn6j, eind, xvyl, c5, mei84, mufwp8i, utolla, udvia, ta1sk, umn7,