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I'm running into some inconsistent behavior with Jest 30.x, specifically when parsing a jest.config.ts file that imports another TypeScript module, on Node.js 22.18+. My code uses ESM syntax for the Jest config but transpiles it to CommonJS.

  • Node 22.18+ with Jest 29.x - works
  • Node 22.17.x with Jest 30.x - works
  • Node 22.18+ with Jest 30.x - fails

Here's the error on Node 22.18+:

jest
Error: Jest: Failed to parse the TypeScript config file /home/ch/jest-config-module-resolution/jest.config.ts
Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/home/ch/jest-config-module-resolution/createJestConfig' imported from /home/christian-siqueira/jest-config-module-resolution/jest.config.ts
    at readConfigFileAndSetRootDir (/home/ch/jest-config-module-resolution/node_modules/jest-config/build/index.js:2269:13)
    at async readInitialOptions (/home/ch/jest-config-module-resolution/node_modules/jest-config/build/index.js:1147:13)
    at async readConfig (/home/ch/jest-config-module-resolution/node_modules/jest-config/build/index.js:918:7)
    at async readConfigs (/home/ch/jest-config-module-resolution/node_modules/jest-config/build/index.js:1168:26)
    at async runCLI (/home/ch/jest-config-module-resolution/node_modules/@jest/core/build/index.js:1397:7)
    at async Object.run (/home/ch/jest-config-module-resolution/node_modules/jest-cli/build/index.js:656:9)

If I switch to full ESM (adding the .ts extension and adjusting the __dirname implementation), it works on Node 22.18+, but then fails on Node 22.17.

I also tried using a docblock for configuring ts-node but had no success.

Running npx ts-node jest.config.ts works consistently on both Node versions.

This is related to the experimental strip types feature, running Node with the --no-experimental-strip-types flag works.

I've created a repo to easily reproduce this.

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    Given you narrowed it down to 22.17 -> 22.18, did you try disabling the one notable new feature? Please put a minimal reproducible example in the question itself. Commented Sep 24 at 15:32
  • Thanks @jonrsharpe, it indeed works when disabling the experimental strip stripes feature. About the minimal reproducible example, I've added a github repo link in the question, but I'll edit it to make it clearer. Commented Sep 24 at 22:21
  • Solution currently being discussed at: <github.com/jestjs/jest/issues/15837> Commented Sep 27 at 17:27
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