Web Reference: Try using the debugging support built into Node. Place a debugger; statement in any of your tests, and then, in your project's directory, run: This will run Jest in a Node process that an external debugger can connect to. Note that the process will pause until the debugger has connected to it. Jul 12, 2024 · Discover troubleshooting tips for Jest issues including test failures, debugging with Node and VS Code, caching problems, and CI server optimizations. Dec 25, 2025 · The "Cannot read property 'testEnvironmentOptions' of undefined" error is almost always caused by a misconfigured or missing Jest setup. By verifying your config file, fixing exports, checking for typos, and validating merged settings, you can resolve it quickly.
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